JP5445492B2 - Adsorber - Google Patents

Description

  The present invention relates to an adsorber that uses the action of an adsorbent to adsorb and desorb a refrigerant.

  Patent Document 1 discloses a porous heat transfer body and adsorbent provided around a plurality of heat medium tubes through which a heat exchange medium flows in order to improve heat transfer characteristics and ensure a high coefficient of performance COP. It is disclosed that the porosity of the heat transfer material is set in a specific range, and the thickness of the adsorbent packed layer is set in a specific range.

JP 2008-121912 A

  However, the above prior art has found a unique configuration from the viewpoint of the performance of the adsorber, but the inventor of the present application has conducted extensive studies including experiments and simulations. From the viewpoint of manufacturing limits, the metal powder and adsorbent that make up the adsorber have to be found to satisfy specific conditions.

  Then, this invention is made | formed in view of the said point, The objective is to provide the adsorption device which can satisfy | fill both adsorption capability and manufacturability.

  The present invention employs the following technical means to achieve the above object. In addition, the code | symbol in the parenthesis as described in a claim and each means of the following shows the correspondence with the specific means as described in embodiment mentioned later as one aspect.

The porous heat transfer body (1) has a plurality of heat medium tubes (21) through which the heat exchange medium flows, and pores (23a) are formed in the peripheral portion (22) of the heat medium tubes (21). 23) and an adsorber (1) comprising an adsorbent (24),
The porous heat transfer body (23) is formed by metal-bonding metal powder (23b) to the heat medium pipe (21) by sintering, and the pores (23a) are filled with an adsorbent (24). ,
A gap including a gap formed between the porous heat transfer body (23) and the heat medium pipe (21) and a pore (23a);
The thickness L [mm] of the adsorbent packed bed formed by filling the adsorbent (24) in the peripheral portion (22) of the heat medium pipe (21) is set in a range of 0.5 ≦ L ≦ 6. ,
The weight of the metal powder (23b) filled in the peripheral part (22) is Mg [kg], the weight of the adsorbent is Ma [kg], and the peripheral part (22) is filled with the metal powder (23b). When the filling volume is Fv [m ³ ] and the density of the metal powder (23b) is ρ [kg / m ³ ], the void ratio Mo is Mo = 1− (Mg / (Fv × ρ)). And is set in a range of 0.7 ≦ Mo ≦ 0.95, and the weight ratio Rg of the metal powder is represented by Rg = Mg / (Mg + Ma),
Furthermore, 0.1732exp (−0.01Mo) ln (L) + 3.902exp (−3.43Mo) ≦ Rg ≦ 6.8 × 10 ⁻⁵ exp (7.4Mo) ln (L) + 1.316exp (−0 .48Mo)
The above relational expression is satisfied.

  According to the present invention, by setting the Rg to be equal to or higher than the lower limit expression in the above relational expression, it is possible to realize the formation of a porous heat transfer body that can reliably obtain the sintered bond of the metal powder. Since the heat capacity of the product can be kept small with respect to the adsorption capacity by setting it below the upper limit equation, a high coefficient of performance COP can be achieved. Therefore, an adsorber having excellent product properties in both adsorption capacity and manufacturability can be obtained.

  According to claim 2, in the adsorber according to claim 1, the metal powder (23b) is preferably a powder formed of copper or a copper alloy.

In the adsorber according to claim 3, the adsorber according to claim 2 has a particle size of 50% as a cumulative distribution in the particle size distribution for each of the metal powder and adsorbent formed from copper or a copper alloy. The median diameter is the median diameter of copper powder and the median diameter of the adsorbent,
When the adsorbent is mixed and the copper powder produced by the electrolytic method or the atomizing method is sintered and bonded to the heat medium pipe (21),
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 3.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
It is characterized by satisfying.

  The inventor of the present application has obtained knowledge of the following problem occurrence. If the ratio of the median diameter of the copper powder to the median diameter of the adsorbent is less than 0.8, the adsorbent is in the way because the particle diameter of the copper powder is smaller than the adsorbent particle diameter. Sintering cannot be performed, and a sintered body such as copper powder cannot be reliably formed. In addition, when it is larger than 3.5, the particle diameter of the copper powder is larger than the particle diameter of the adsorbent, and the phenomenon that the adsorbent falls off between the copper powder particles occurs, and the porous material filled with the necessary adsorbent A heat transfer material cannot be formed. Moreover, if the bulk density of the copper powder is less than 0.4, the branch-shaped part that is a part of the copper powder shape becomes long, and thus a phenomenon that the adsorbent falls off easily occurs. On the other hand, when the ratio is larger than 1.6, the branch-shaped portion is conversely shortened, so that the adsorbent becomes an obstacle and sintering bonding cannot be performed, and a sintered body such as copper powder cannot be reliably formed.

  Therefore, according to the invention according to claim 3, based on the above-mentioned knowledge obtained by the inventor of the present application, an adsorber that can eliminate problems in forming a sintered body and ensures adsorption capacity and product quality. can get.

The invention according to claim 4 is characterized in that in claim 3, 0.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 1.9 and 0.6 ≦ bulk density of copper powder [ g / cc] ≦ 1.5 is preferably satisfied.

  According to this invention, it is possible to obtain an adsorber that more reliably solves the above-mentioned problem solved by the invention of claim 3. Moreover, since the strength of the sintered bond can be further increased, the heat transfer performance of the adsorber can be further improved.

The invention according to claim 5 is the adsorber according to claim 2, wherein each of the metal powder and the adsorbent formed from copper or a copper alloy has a particle size of 50% as a cumulative distribution in the particle size distribution. The median diameter is the median diameter of copper powder and the median diameter of the adsorbent,
When further pulverizing the copper powder produced by the atomization method, electrolytic method, pulverization method, chemical reduction method, adsorbent is mixed and sinter bonded to the heat medium tube (21),
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
It is characterized by satisfying.

  According to the invention which concerns on Claim 5, the copper powder produced | generated by the atomizing method, the electrolysis method, the grinding | pulverization method, and the chemical reduction method is further crushed, the said copper powder is mixed with an adsorbent, and is baked to a heat-medium pipe | tube (21). In the case of binding, based on the above knowledge obtained by the inventor of the present application, problems in forming the sintered body can be solved, and an adsorber that secures adsorption ability and product quality is obtained. In particular, this copper powder can be obtained even when the atomizing method, which is relatively inexpensive to manufacture, is used, and therefore has an advantageous effect in terms of cost.

The invention according to claim 6 is the invention according to claim 5,
Further, 1.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.0
And 0.6 ≦ bulk density of copper powder [g / cc] ≦ 1.5
It is characterized by satisfying.

  According to this invention, it is possible to obtain an adsorber that more reliably solves the above-mentioned problem solved by the invention of claim 5. Moreover, since the strength of the sintered bond can be further increased, the heat transfer performance of the adsorber can be further improved.

It is a transverse cross section showing the adsorption machine concerning a 1st embodiment of the present invention. It is an arrow view of the II-II cross section in FIG. It is a typical sectional view showing an adsorbent packed bed in an adsorber. It is a schematic diagram which shows the shape of the metal powder used for a porous medium. It is a characteristic view which shows the relationship between the porosity and the packing density of adsorbent. It is a characteristic view explaining the relationship between the porosity and cooling performance in case the thickness L of an adsorbent filling layer is 2 mm. It is a characteristic view explaining the relationship between the porosity and the coefficient of performance COP when the thickness L of the adsorbent packed layer is 2 mm. It is a characteristic view explaining the relationship between the porosity and cooling performance in case the thickness L of an adsorbent filling layer is 4 mm. It is a characteristic view explaining the relationship between the porosity and the coefficient of performance COP when the thickness L of the adsorbent packed layer is 4 mm. It is a graph explaining the relationship between the product weight per unit adsorption performance and the metal powder weight ratio when the porosity is 70% and the adsorbent packed layer thickness is 0.5 mm, 2 mm, and 6 mm. It is the graph which showed the formation range of the product in the case of the porosity of 70% about the parameters of the adsorbent packed layer thickness and the metal powder weight ratio. It is a graph explaining the relationship between the product weight per unit adsorption performance and the metal powder weight ratio when the porosity is 90% and the adsorbent packed layer thickness is 0.5 mm, 2 mm, and 6 mm. It is the graph which showed the formation range of the product in the porosity of 90% about the parameter of adsorbent packing layer thickness and metal powder weight ratio. It is a graph explaining the relationship between the product weight per unit adsorption performance and the metal powder weight ratio when the porosity is 95% and the adsorbent packed layer thickness is 0.5 mm, 2 mm, and 6 mm. It is the graph which showed the formation range of the product in the porosity of 95% about the parameters of the adsorbent packed bed thickness and the metal powder weight ratio. It is the graph which showed the formation range of the product in the porosity of 70%-95% about the parameters of the adsorbent packed bed thickness and the metal powder weight ratio. It is the graph which showed the formation range of a product about the ratio of the median diameter of copper powder and the median diameter of an adsorption agent, and the parameter of copper powder bulk density. It is the graph which showed the formation range of the more preferable product about the ratio of the median diameter of copper powder and the median diameter of an adsorption agent, and the parameter of copper powder bulk density. It is a schematic diagram which shows the shape of the metal powder used for the porous medium which concerns on 2nd Embodiment. It is the graph which showed the relationship between the copper powder which concerns on 2nd Embodiment, and the formation range of the product shown in FIG. It is the graph which showed the formation range of the product regarding the ratio of the median diameter of copper powder and the median diameter of an adsorbent, and the parameter of copper powder bulk density about copper powder concerning a 2nd embodiment. It is the graph which showed the formation range of the more preferable product regarding the ratio of the median diameter of copper powder and the median diameter of an adsorbent, and the parameter of copper powder bulk density about the copper powder which concerns on 2nd Embodiment. It is typical sectional drawing which shows the schematic structure of the heat exchanger of 3rd Embodiment which has the characteristic similar to the adsorption machine of this invention. It is a typical sectional view showing the 1st modification of the adsorption machine concerning a 1st embodiment. It is a typical sectional view showing the adsorption machine of the 2nd modification.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also a combination of the embodiments even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
The adsorber according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing an adsorber 1 according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a schematic cross-sectional view showing an adsorbent packed bed in the adsorber 1. FIG. 4 is a schematic diagram showing an example of the shape of the metal powder 23 b included in the porous medium 23.

  The adsorber 1 is used in an adsorption-type refrigerator that utilizes the fact that the adsorbent contained therein evaporates the refrigerant using the action of adsorbing the gas-phase refrigerant (for example, water vapor) and exhibits the refrigerating capacity by the latent heat of vaporization. It is what is done. The adsorber 1 can be applied to an air conditioner for vehicles, for example. As shown in FIGS. 1 and 2, the adsorber 1 includes an adsorption heat exchanger 2 in a housing 31. The adsorption heat exchanger 2 has a heat medium pipe 21 through which a heat exchange medium (refrigerant) flows, and includes a porous heat transfer body 23 having pores and an adsorbent 24 in a peripheral portion 22 surrounding the heat medium pipe 21. ing.

  As shown in FIG. 3, the adsorption heat exchanger 2 has a heat medium pipe 21 made of copper or a copper alloy (in the present embodiment, described below as copper), and a porous body in which pores 23a are formed. A heat transfer body 23 and an adsorbent 24 arranged to fill the pores 23a are provided. The porous heat transfer body 23 is a mixed sintered body of the metal powder 23b and the adsorbent 24 that are sintered and bonded without heating and melting the metal powder 23b having excellent thermal conductivity. The metal powder 23b uses copper or a copper alloy (in this embodiment, described below as copper).

  For example, in the case of the copper powder, it is formed into a powdery shape, a particulate shape, a spherical shape, a dendritic shape (dendritic shape), a fibrous shape, or the like. For example, the dendritic copper powder 23b has a shape as shown in FIG.

  As shown in FIG. 3, the porous heat transfer body 23, that is, the sintered body obtained by sintering and bonding the metal powder 23b, has fine sintered fins having pores 23a (hereinafter also referred to as porous sintered fins). Form. The pores 23a are fine pores that are matched so as to be able to be filled with the adsorbent 24 whose particle diameter is smaller than that of the metal powder 23b. Further, the porous heat transfer body 23 is sinter-bonded to the peripheral portion 22 of the heat medium pipe made of copper. The porous heat transfer body 23 is formed by the peripheral portions 22 of the plurality of heat medium tubes so that the entirety thereof extends in one direction, and has a cylindrical shape as a whole shape.

  Since the porous heat transfer body 23 having the pores 23 a and the heat medium tube 21 are bonded to each other by sintering, the porous heat transfer body to be bonded is not only the pores 23 a formed in the porous heat transfer body 23. A gap is formed between 23 and the heat medium pipe 21. These gaps and pores 23a are included in the voids described in the claims.

  The adsorbent 24 is formed into a number of minute particles, and can be composed of, for example, silica gel, zeolite, activated carbon, activated alumina, or the like. The adsorbent 24 is filled in the pores 23 a of the porous heat transfer body 23.

  Between adjacent heat medium pipes 21, a water vapor passage 25 through which water vapor as an adsorbed medium flows is arranged. The cross-sectional shape of the water vapor passage 25 may be formed as a circle, an ellipse, a rectangle, or the like. As shown in FIG. 1, the water vapor passage 25 is arranged in a region surrounded by three heat medium tubes 21, but is not limited to three, and is in a region surrounded by four or more heat medium tubes 21. It may be arranged. The water vapor passage 25 plays a role of promptly penetrating into the porous heat transfer body 23 in the peripheral portion 22 of the heat medium pipe through the water vapor from the evaporator during adsorption. At the time of desorption, the water vapor discharged from the porous heat transfer body 23 in the peripheral portion 22 of the heat medium tube plays a role of promptly leading to the condenser through the water vapor passage 25.

  The adsorber 1 includes an adsorption heat exchanger 2, a casing 31, sheets 32 and 33, and tanks 34 and 35. The casing 31 is formed in a cylindrical shape made of copper or a copper alloy, and the porous heat transfer body 23 in the substantially cylindrical adsorption heat exchanger 2 can be accommodated therein. The upper end opening and the lower end opening of the housing 31 are sealed with sheets 32 and 33. An inflow pipe 36 and an outflow pipe 37 that can guide water vapor to the adsorbent packed bed of the adsorption heat exchanger 2 are provided on the upper portion of the housing 31.

  As described above, the end opening of the casing 31 is sealed with the sheets 32 and 33, so that the inside of the casing 31 can be held in a vacuum. At the time of adsorption, the water vapor is distributed from the evaporator side to the water vapor passage 25 through the inflow pipe 36. The water vapor distributed to the water vapor passage 25 penetrates into the adsorbent packed bed. At the time of desorption, the water vapor is discharged from the adsorbent packed bed, and the discharged water vapor is guided to the condenser side from the outflow pipe 37 through each water vapor passage 25.

  The sheets 32 and 33 are formed with through holes 32a and 33a through which the heat medium pipe 21 can pass. The through holes 32a and 33a and the heat medium pipe 21 are airtightly fixed by joining by brazing or the like.

  The tanks 34 and 35 are provided with an inflow pipe 38 and an outflow pipe 39 that can guide the heat exchange medium. The heat exchange medium flows into the lower tank 34 from the inflow pipe 38, passes through each heat medium pipe 21, flows into the upper tank 35, and flows out from the outflow pipe 39. Such tanks 34 and 35 are tanks for supplying and distributing the heat exchange medium to the plurality of heat medium pipes 21. The casing 31 and the heat medium pipe 21 may have any of a cylindrical shape, an elliptical shape, and a rectangular shape in cross section.

  The porous heat transfer body 23 provided in the peripheral portion 22 of the heat medium pipe is referred to as an adsorbent packed layer. This adsorbent packed layer corresponds to the thickness (adsorbent packed layer thickness) L of the porous sintered fin sintered and bonded at the peripheral portion 22 of the heat medium tube (see FIG. 3).

  The adsorbent packed layer thickness L may be set in a range of 0.5 mm or more and 6 mm or less that can secure the performance from the maximum performance to 70% in consideration of the cooling performance (absorption amount) per unit volume. preferable.

In the adsorption heat exchanger 2 having the preferable adsorbent packed layer thickness L as described above, the inventor of the present application relates to the cooling performance when the physical characteristics such as the bulk density of the metal powder 23b and the adsorbent 24 are changed. Experimental verification was performed. As an evaluation item of the cooling performance evaluated in the verification experiment, in addition to the cooling capacity per unit volume (cooling capacity ratio), the coefficient of performance COP and the like were evaluated.
Here, the cooling capacity ratio Q is expressed by (Equation 1).
(Formula 1)
Q = G × ΔC × ΔH × η / τ
In (Expression 1), G is the amount of the adsorbent 24 [kg], ΔC is the adsorption characteristic of the adsorbent 24 with respect to water vapor (hereinafter referred to as water adsorption characteristic) [kg / kg], ΔH is the latent heat [kJ / kg], η is the adsorption efficiency (the proportion of the adsorbent adsorbed under the operating conditions), τ is the switching time, and η / τ is the adsorption rate.
The coefficient of performance COP is expressed by (Formula 2).
(Formula 2)
Coefficient of performance COP = Q / (Q + Qh)
In (Equation 2), Qh is the amount of heat (kW) required to change the temperature of the component parts such as the adsorption heat exchanger 2 and the casing 31 constituting the adsorber 1, and the adsorbent 24, porous The heat capacity of the heat transfer body 23, the heat medium pipe 21, and the housing 31.

  According to the above experimental results, it was confirmed that the adsorbent packed layer thickness L that maximizes the cooling capacity ratio surely exists within the range of 0.5 mm to 6 mm. However, regardless of the size of the adsorbent packed layer thickness L, the cooling capacity ratio and the coefficient of performance COP are compared depending on the amount of the porous heat transfer body 23, that is, the amount of the metal powder 23b sintered as a sintered body. The knowledge that it will change greatly is obtained. For example, even when the adsorbent packed layer thickness L is 2 mm, which is the maximum performance, the cooling performance ratio and the coefficient of performance COP are relatively different depending on the amount of the metal powder 23b.

Therefore, the inventor of the present application (1) changes the size of the void formed by sintering and bonding the metal powder 23b as pores of the sintered body depending on the amount of the metal powder 23b. When the amount of the adsorbent 24 that can be filled is different, and (2) the state of the void, for example, the porosity Mo indicating the state changes, the heat transfer area inside the porous heat transfer body 23 in contact with the adsorbent 24 is changed. Different investigations focused on different thermal characteristics. The porosity Mo is expressed by (Formula 3).
(Formula 3)
Porosity Mo = 1− (Mg / (Fv × ρ))
In (Formula 3), Mg is the amount [kg] of the metal powder 23b filled to form the porous heat transfer body 23, Fv is the filling volume [m ³ ] filled with the metal powder 23b, ρ Is the density [kg / m ³ ] of the metal powder 23b. For example, the metal powder 23b filled in the peripheral portion 22 of the cylindrical heat medium pipe 21 is Mg, and the filling volume of the peripheral portion 22 is Fv.

  First, Q represented by (Equation 1) is proportional to the amount G of the adsorbent 24 and the adsorption rate (η / τ), so increasing the amount of the adsorbent 24 and the adsorption rate (η / τ). ) Is improved when at least one of the following is established. The coefficient of performance COP represented by (Equation 2) is compared by Q and the heat capacity of the adsorbent 24 and the porous heat transfer body 23, that is, the metal powder 23b formed on the sintered body by sintering. Greatly affected.

  Further, the amount of the adsorbent 24 and the amount of the metal powder 23b affecting Q and COP are as shown in the characteristic diagram showing the relationship between the porosity and the packing density of the adsorbent 24 shown in FIG. The maximum amount G that can be filled with the adsorbent 24 is determined in accordance with the porosity determined based on the amount of the adsorbent 24. Therefore, it is possible to relate the porosity Mo represented by (Formula 3) to Q and COP.

  FIG. 5 is a characteristic diagram showing the relationship between the porosity and the packing density of the adsorbent 24. The horizontal axis shows the porosity, the vertical axis shows the packing density of the adsorbent 24, and one of the physical characteristics of the adsorbent 24. Two examples in the case of different bulk densities A and B by changing the bulk densities A and B are shown. The bulk density [g / cc] is the mass when the adsorbent 24 (powder) is filled in a unit-volume container in a naturally filled state, and conforms to JIS Z 2504. Further, the packing density of the adsorbent 24 shown on the vertical axis is the maximum packing density when the adsorbent 24 having the respective bulk densities A and B is filled. In the present embodiment, the bulk densities A and B are set to 0.7 [g / cc] and 0.5 [g / cc], respectively. The range of bulk density B or more and bulk density A or less is that the range that can be used in the adsorption heat exchanger 2 of the present embodiment is within the range of bulk density of 0.5 to 0.7 [g / cc]. This is because.

  As shown in FIG. 5, for example, in the case of the bulk density A, in a region where the metal powder (copper powder) 23b is large, that is, in a region where the porosity is low, a sintered body such as the copper powder 23b is made of porous sintered fins (porous Heat transfer characteristics are improved by expanding the contact area with the adsorbent 24 filled in the porous sintered fin, but the void ratio is low, so the gap can be filled. The amount of the adsorbent 24 is reduced. In such an area with a low porosity, the cooling capacity is reduced, and the proportion of heat radiation is increased, leading to a decrease in the coefficient of performance COP. On the other hand, in the region where the amount of the metal powder 23b is reduced and the porosity is increased, the amount that can be filled with the adsorbent 24 increases, but the heat transfer characteristics are reduced due to the reduction of the contact area with the adsorbent 24, so that the cooling capacity In addition, there is a concern that the coefficient of performance COP will decrease.

  Next, in order to optimize the porosity, the relationship between the porosity and the cooling capacity ratio, and the relationship between the porosity and the coefficient of performance COP will be described with reference to FIGS. 6 and 8 and FIGS. 7 and 9, respectively. The characteristic diagram showing the porosity and the cooling capacity ratio in FIG. 6 and the characteristic diagram showing the relationship between the porosity and the coefficient of performance COP in FIG. 7 are examples of an adsorption that maximizes the cooling capacity ratio without considering the porosity. When the agent-filled layer thickness L is 2 mm, the cooling capacity ratio and the coefficient of performance COP related to the porosity are calculated. Further, the characteristic diagram showing the porosity and the cooling capacity ratio in FIG. 8 and the characteristic diagram showing the relationship between the porosity and the coefficient of performance COP in FIG. 9 are not the maximum performance, but the adsorbent satisfying the allowable cooling capacity ratio. When the packed layer thickness L is 4 mm, the cooling capacity ratio and the coefficient of performance COP related to the porosity are calculated.

  In optimizing the porosity, the allowable cooling capacity ratio was set to 85% or more of the maximum cooling capacity. Further, the acceptable coefficient of performance COP was set to 0.5 or more. Thereby, since the cooling capacity from the maximum performance to 85% can be ensured, a reduction of about 15% with respect to the maximum performance can be suppressed, and a cooling capacity close to the maximum performance can be obtained. Moreover, since the allowable coefficient of performance COP is 0.5 or more, it is possible to operate with less waste heat from the waste heat source of the heat exchange medium. Furthermore, since the allowable coefficient of performance COP is 0.5 or more, even if there is a case where it is desired to operate the adsorption heat exchanger 2 in a region where the heat dissipation performance is small, the adsorption heat exchanger 2 should be operated without increasing its size. Can do.

  As shown in FIG. 6, in the characteristic diagram of the porosity and the cooling capacity ratio when the adsorbent packed layer thickness L is 2 mm, the bulk density of the adsorbent 24 is either bulk density A or bulk density B. Even so, the cooling capacity ratio increases almost in proportion to the increase in porosity. When the increased porosity reaches 90%, the cooling capacity ratio becomes the maximum, and in the region where the subsequent porosity exceeds 95%, the cooling capacity ratio rapidly decreases as the porosity increases. Further, when the bulk densities A and B of the adsorbent 24 are compared with each other, the cooling capacity ratio of the bulk density B having a small bulk density is larger than the cooling capacity ratio of the bulk density A in almost the entire range of the porosity. Inferior.

  Even in the case of the bulk density B having a small bulk density as described above, in order to ensure a performance of 85% or more with respect to the maximum performance, the porosity is 70% to 95% as shown in FIG. It is preferable to set within the range.

  As shown in FIG. 7, in the characteristic diagram of the porosity and the coefficient of performance COP when the adsorbent packed layer thickness L is 2 mm, the porosity of either the bulk density A or the bulk density B The coefficient of performance COP increases almost in proportion to the increase. When the increased porosity reaches 95%, the coefficient of performance COP becomes maximum, and in the region where the porosity thereafter exceeds 98%, the coefficient of performance COP decreases rapidly as the porosity increases. Further, when comparing the bulk densities A and B, the coefficient of performance COP of the bulk density B having a small bulk density is inferior to the coefficient of performance COP of the bulk density A in almost the entire range of the porosity.

  Even in the case of the bulk density B having a small bulk density, in order to secure a coefficient of performance COP of 0.5 or more, the porosity is set to 60% or more as shown in FIG. Preferably it is. Furthermore, in order to maintain a state where the cooling capacity ratio and the coefficient of performance COP are high, the porosity is preferably set within a range of 70% to 95%.

  Next, as shown in FIG. 8, in the characteristic diagram of the porosity and the cooling capacity ratio when the adsorbent packed layer thickness L is 4 mm, the bulk density A, the bulk density B, The cooling capacity ratio increases almost in proportion to the increase in porosity. When the increased porosity reaches 80%, the cooling capacity becomes maximum, and in the region where the porosity thereafter exceeds 95%, the cooling capacity ratio rapidly decreases as the porosity increases.

  Even in the case of the bulk density B having a small bulk density, in order to ensure a performance of 85% or more with respect to the maximum performance, the porosity is within a range of 50% to 95% as shown in FIG. It is preferable that it is set to.

  As shown in FIG. 9, in the characteristic diagram of the porosity and the coefficient of performance COP when the adsorbent packed layer thickness L is 4 mm, the porosity of either the bulk density A or the bulk density B The coefficient of performance COP increases almost in proportion to the increase. When the increased porosity reaches 95%, the coefficient of performance COP becomes maximum, and in the region where the porosity after that exceeds 98%, the coefficient of performance COP may rapidly decrease as the porosity increases.

  Even in the case of the bulk density B having a small bulk density, in order to ensure a coefficient of performance COP of 0.5 or more, the porosity should be set to 60% or more as shown in FIG. preferable. Further, in order to maintain a high cooling capacity ratio and coefficient of performance COP even when the thickness L of the adsorbent packed layer in the optimized range L of the adsorbent packed layer is 4 mm. The porosity is preferably set in the range of 60% to 95%. Furthermore, when the adsorbent packed layer thickness L is in the optimized range, by setting the porosity within the range of 70% to 95%, the cooling capacity ratio and the coefficient of performance COP are high. It can be reliably maintained.

  Based on the above verification, for the adsorber 1, the porosity Mo represented by (Expression 3) is in the range of 0.7 to 0.95, and the adsorbent packed layer thickness L is 0.5 mm to 6 mm. It was confirmed that the range is preferable. Further, the inventors of the present application conducted simulation, trial manufacture, experiment, etc. in the range of the porosity Mo and the adsorbent packed layer thickness L, and the weight of the metal powder relative to the total weight including the metal powder and the adsorbent. The formation range described later for the ratio Rg (hereinafter also simply referred to as “metal powder weight ratio Rg”) was determined. The metal powder weight ratio Rg is expressed by the following (formula 4).

(Formula 4)
Rg = Mg / (Mg + Ma)
Mg is the amount [kg] of the metal powder 23 b filled to form the porous heat transfer body 23, and Ma is the weight [kg] of the adsorbent 24.

  Below, the verification result which reached the said establishment range of Rg is demonstrated with reference to FIGS. The formation range of the metal powder weight ratio Rg is a range clarified by judging that the performance as the adsorber 1 is not rapidly deteriorated and that sintering bonding of the metal powder or the like to the heat medium tube is possible. It is. The standard is a standard that can secure the necessary performance to be established as a product. For example, the performance with respect to the maximum performance falls within a decrease of 20% or less.

  FIG. 10 shows the relationship between the product weight per unit adsorption performance (adsorber weight) and metal powder weight ratio Rg obtained under the conditions of 70% porosity and adsorbent packed layer thickness L of 0.5 mm, 2 mm, and 6 mm. It is a graph explaining. The product weight per unit adsorption performance is the product weight [kg / kW] per unit absorbed amount (amount of water).

  As shown in FIG. 10, under the condition of the adsorbent packed layer thickness L = 0.5 mm (curve indicated by the alternate long and short dash line in FIG. 10), the metal powder weight ratio Rg is about 30 wt% and the product weight per unit adsorption performance is Minimum value (about 0.5). Under the condition of the adsorbent packed layer thickness L = 2 mm (curve shown by the broken line in FIG. 10), the product weight per unit adsorption performance becomes the minimum value (about 1.0) when the metal powder weight ratio Rg is about 70 wt%. . Under the condition of the adsorbent packed layer thickness L = 6 mm (curve shown by the solid line in FIG. 10), the metal powder weight ratio Rg is about 88 wt%, and the product weight per unit adsorption performance becomes the minimum value (about 4.0). FIG. 10 shows an approximate curve connecting these minimum values (open circles in FIG. 10) in the adsorbent packed layer thickness L of each condition.

  FIG. 11 is a graph showing product formation ranges at a porosity of 70% for each parameter in which the adsorbent packed layer thickness L is set on the horizontal axis and the metal powder weight ratio Rg is set on the vertical axis. The lower limit line in FIG. 11 is a boundary line indicating whether or not sintering bonding of metal powder or the like can be performed to the extent necessary for a product. In the region below the lower limit line, strong bonding cannot be obtained and sintering bonding is performed. Is not carried out stably, for example, it has been confirmed that the adsorbent packed bed is missing or dropped off. Similarly, the upper limit line in FIG. 11 is a boundary line as to whether or not the performance as a product can be ensured, and in the region above the upper limit line, the performance of the adsorber suddenly decreases. It has been confirmed that the heat capacity becomes larger than that.

  From these, under the condition of a porosity of 70%, the region between the upper limit line and the lower limit line in FIG. The white circles in FIG. 11 are plotted by plotting the conditions of the adsorbent packed layer thickness L on the horizontal axis and the metal powder weight ratio Rg satisfying the aforementioned minimum value on the vertical axis. And the approximate curve which connected the white circle in FIG. 11 exists between the upper limit line of FIG. 11, and a lower limit line, and it can confirm confirming that it is contained in the formation range which can ensure the performance and function as a product. .

  Next, FIG. 12 shows the product weight per unit adsorption performance (adsorber weight) and metal powder weight ratio obtained under the conditions of a porosity of 90% and an adsorbent packed layer thickness L of 0.5 mm, 2 mm, and 6 mm. It is a graph explaining the relationship of Rg.

  As shown in FIG. 12, under the condition of the adsorbent packed layer thickness L = 0.5 mm (curve indicated by the alternate long and short dash line in FIG. 12), the metal powder weight ratio Rg is about 20 wt% and the product weight per unit adsorption performance is Minimum value (about 0.4). Under the condition of the adsorbent packed layer thickness L = 2 mm (curve shown by the broken line in FIG. 12), the metal powder weight ratio Rg is about 60 wt%, and the product weight per unit adsorption performance becomes the minimum value (about 0.6). . Under the condition of the adsorbent packed layer thickness L = 6 mm (curve shown by the solid line in FIG. 12), the metal powder weight ratio Rg is about 76 wt%, and the product weight per unit adsorption performance becomes the minimum value (about 2.0). FIG. 12 shows an approximate curve connecting these minimum values (open circles in FIG. 12) in the adsorbent packed layer thickness L of each condition.

  FIG. 13 is a graph showing the formation range of products at a porosity of 90% for each parameter in which the adsorbent packed layer thickness L is set on the horizontal axis and the metal powder weight ratio Rg is set on the vertical axis. The lower limit line in FIG. 13 is a boundary line indicating whether or not the sintering bonding of metal powder or the like can be performed to the extent necessary for the product. In the region below the lower limit line, a strong bonding cannot be obtained and the sintering bonding is performed. Is not carried out stably, for example, it has been confirmed that the adsorbent packed layer is missing or falls off. Similarly, the upper limit line in FIG. 13 is a boundary line as to whether or not the performance as a product can be ensured, and in the region above the upper limit line, the performance of the adsorber suddenly decreases. It has been confirmed that the heat capacity becomes larger than that.

  From these, under the condition of the porosity of 90%, the region between the upper limit line and the lower limit line in FIG. 13 is the product formation range. The white circles in FIG. 13 are plotted with each condition of the adsorbent packed layer thickness L plotted on the horizontal axis and the metal powder weight ratio Rg satisfying the aforementioned minimum value on the vertical axis. And the approximate curve which connected the white circle in FIG. 13 exists between the upper limit line of FIG. 13, and a lower limit line, and it can confirm confirming that it is contained in the formation range which can ensure the performance and function as a product. .

  Next, FIG. 14 shows the product weight per unit adsorption performance (weight of the adsorber) and the metal powder weight ratio obtained under the conditions of the porosity of 95% and the adsorbent packed layer thickness L of 0.5 mm, 2 mm, and 6 mm. It is a graph explaining the relationship of Rg.

  As shown in FIG. 14, under the condition of the adsorbent packed layer thickness L = 0.5 mm (the curve indicated by the alternate long and short dash line in FIG. 14), the metal powder weight ratio Rg is about 10 wt% and the product weight per unit adsorption performance is Minimum value (about 0.4). Under the condition of the adsorbent packed layer thickness L = 2 mm (curve shown by the broken line in FIG. 14), the metal powder weight ratio Rg is about 50 wt%, and the product weight per unit adsorption performance becomes the minimum value (about 0.5). . Under the condition of the adsorbent packed layer thickness L = 6 mm (curve shown by the solid line in FIG. 14), the metal powder weight ratio Rg is about 67 wt%, and the product weight per unit adsorption performance becomes the minimum value (about 1.4). FIG. 14 shows an approximate curve connecting these minimum values (open circles in FIG. 14) in the adsorbent packed layer thickness L of each condition.

  FIG. 15 is a graph showing product formation ranges at a porosity of 95% for each parameter in which the adsorbent packed layer thickness L is set on the horizontal axis and the metal powder weight ratio Rg is set on the vertical axis. The lower limit line in FIG. 15 is a boundary line indicating whether or not sintering bonding of metal powder or the like can be performed to the extent necessary for a product. In the region below the lower limit line, strong bonding cannot be obtained and sintering bonding is performed. Is not carried out stably, for example, it has been confirmed that the adsorbent packed layer is missing or falls off. Similarly, the upper limit line in FIG. 15 is a boundary line as to whether or not the performance as a product can be ensured, and in the region above the upper limit line, the performance of the adsorber suddenly decreases. It has been confirmed that the heat capacity becomes larger than that.

  From these, under the condition of a porosity of 95%, the region between the upper limit line and the lower limit line in FIG. The white circles in FIG. 15 are plotted with each condition of the adsorbent packed layer thickness L plotted on the horizontal axis and the metal powder weight ratio Rg satisfying the aforementioned minimum value on the vertical axis. And the approximate curve which connected the white circle in FIG. 15 exists between the upper limit line of FIG. 15, and a lower limit line, and it can confirm confirming that it is contained in the formation range which can ensure the performance and function as a product. .

  FIG. 16 is a graph showing the formation range of products when the porosity is 70% to 95% for the parameters of the adsorbent packed layer thickness L and the metal powder weight ratio Rg. That is, FIG. 16 shows an established range corresponding to the region between the upper limit line and the lower limit line described with reference to FIGS. 11, 13, and 15 described above. In FIG. 16, an upper limit line and a lower limit line in the case of a porosity of 70% and a porosity of 95%, respectively, are drawn, and in the case of a porosity of 90%, the line has a porosity of 70% and a porosity of 95%. Because it exists between the relevant lines, it is omitted.

  Based on the above verification results, as shown in FIG. 16, the formation range of products satisfying both the adsorption capacity and manufacturability is an area occupying between the lower limit line with a porosity of 70% and the upper limit line with a porosity of 95%. It is. The approximate expression of the lower limit line with a porosity of 70% is determined by the following (Expression 5), and the approximate expression of the upper limit line with a porosity of 95% is determined by the following (Expression 6). It was.

(Formula 5)
Rg = 0.1732exp (−0.01Mo) ln (L) + 3.902exp (−3.43Mo)
(Formula 6)
Rg = 6.8 × 10 ⁻⁵ exp (7.4Mo) ln (L) + 1.316exp (−0.48Mo)
Therefore, the adsorber 1 has a porosity Mo defined by (Equation 3) of 0.7 ≦ Mo ≦ 0.95 and an adsorbent packed layer thickness L [mm] of 0.5 ≦ L ≦ 6. Set to range,
Furthermore, 0.1732exp (−0.01Mo) ln (L) + 3.902exp (−3.43Mo) ≦ Rg ≦ 6.8 × 10 ⁻⁵ exp (7.4Mo) ln (L) + 1.316exp (−0 .48 Mo) is preferable.

  In such a product, since the metal powder weight ratio Rg is set to be equal to or greater than the right side of the above (Formula 5), the metal powder 23b and the like are firmly sintered and bonded to the heat medium tube 21, and the heat medium tube A stable porous heat transfer body can be formed in the peripheral portion 22 of the steel. Furthermore, since the metal powder weight ratio Rg is set to be equal to or less than the right side of the above (formula 6), the heat capacity can be suppressed to be small with respect to the adsorption capability of the adsorber 1. For this reason, improvement in the coefficient of performance COP can be expected. From these, it is possible to provide an adsorber 1 having excellent product properties that achieves both adsorption capacity and manufacturability.

  Next, the conditions under which formation of a sintered body can be ensured when copper or copper alloy powder is used as the metal powder 23b will be described with reference to Table 1, FIG. 17 and FIG. The inventor of the present application has obtained knowledge that there is a condition that a sintered body cannot be formed depending on the particle diameter or bulk density of copper powder as a result of diligent research, experiments, investigations, etc. when copper powder is used. .

  The inventor of the present application then changes the physical properties such as the median diameter [μm] of the copper powder to be used, the bulk density [g / cc] of the copper powder, and the median diameter [μm] of the adsorbent. Experiments were conducted to verify whether or not the formation of a knot was possible. The verification results are as shown in (Table 1) below.

  In this verification, the copper powder was produced by an electrolytic method or an atomizing method. In the electrolytic method, copper powder is produced by electrolysis, and in the atomizing method, the material is dissolved, and a jet fluid is sprayed onto the molten metal to produce a fine powder to produce copper powder. The copper powder thus produced becomes spherical and dendritic (dentite-like).

The median diameter [μm] of the copper powder is a median diameter (also referred to as a median diameter) that is 50% of the cumulative particle diameter distribution of the copper powder used. The median diameter [μm] of the adsorbent is a median diameter (also referred to as a median diameter) that is 50% of the particle size distribution of the adsorbent 24 used. The median diameter is obtained by measuring the particle size distribution by a measurement method according to JIS Z 8801 and calculating a particle size of 50% from the measured cumulative distribution or using a laser diffraction particle size distribution measuring device. It can be obtained by calculating a particle size of 50% from the obtained cumulative distribution.

  17 and 18 show the verification results shown in (Table 1). The vertical axis represents the bulk density [g / cc] of the copper powder, and the horizontal axis represents the median diameter of the copper powder divided by the median diameter of the adsorbent. This is a plot with the values set to In FIG. 17 and FIG. 18, “x” is plotted as a result of being unable to form a sintered body, and “◯” is plotted as a result of being able to be formed.

  In FIG.17 and FIG.18, copper powder is provided in a dense state, so that the bulk density (vertical-axis coordinate) of copper powder is large, for example, the branch-like part of dentlite-like copper powder is a short state. On the contrary, in FIG. 17, the smaller the bulk density (ordinate on the vertical axis) of the copper powder is, the more coarse the copper powder is, for example, the longer the branch-like portion of the dentrite-like copper powder. In FIG. 17, the larger the horizontal coordinate, the larger the copper powder.

  Inside the rectangle shown in FIG. 17 is a range in which a sintered body can be formed, and outside the rectangle is a range in which a sintered body cannot be formed. That is, each side of the rectangle indicates a production limit line indicating whether or not the sintered body in the adsorber 1 can be manufactured or an allowable line for product performance.

  The inventor of the present application has obtained the following knowledge by this verification. If the value obtained by dividing the median diameter of the copper powder by the median diameter of the adsorbent is less than 0.8, the particle diameter of the copper powder is small with respect to the particle diameter of the adsorbent, and due to the presence of a large adsorbent, Sintering is not performed properly, and a sintered body having the required strength cannot be formed. On the other hand, when the ratio is larger than 3.5, the particle diameter of the copper powder is larger than the particle diameter of the adsorbent, and a phenomenon occurs in which the adsorbent 24 falls off between the copper powder particles. A filled porous heat transfer body cannot be formed, and sufficient adsorption capacity cannot be obtained. Further, if the bulk density of the copper powder is less than 0.4, the branch-like portion that is a part of the copper powder shape becomes long, so that the phenomenon that the adsorbent 24 falls off easily occurs, and sufficient adsorption capacity is obtained. I can't. On the other hand, when the ratio is larger than 1.6, the branch portion is shortened. Therefore, the adsorbent 24 becomes an obstacle, and the sintering bonding cannot be performed properly, and a sintered body having a required strength cannot be formed.

In order to eliminate the above problems, according to the result shown in FIG. 17, the formation range of the product based on the formation of the sintered body is such that the coordinate of the vertical axis is 0.4 to 1.6 and the horizontal axis The coordinates were required to be 0.8 or more and 3.5 or less. Therefore,
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 3.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
It is preferable that the product satisfies both of the relational expressions.

  Thus, if the product is set with each parameter, it is possible to eliminate the problems in forming the sintered body and the performance, and it is possible to provide the adsorber 1 having excellent product properties that achieves both adsorption capacity and product properties. .

Further, FIG. 18 is a graph showing the formation range of products that can obtain a more preferable state of sintering than FIG. According to FIG. 18, the more preferable formation range of the product based on the formation of the sintered body is that the coordinate of the vertical axis is 0.6 or more and 1.5 or less and the coordinate of the horizontal axis is 0.9 or more and 1.9 or less. It can be seen that it is.
Therefore,
0.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 1.9,
And 0.6 ≦ bulk density of copper powder [g / cc] ≦ 1.5
It is further preferable that the product satisfies both of the relational expressions.

  In this way, if the parameters are set for the product, the adsorber 1 that can more reliably eliminate the problems in the formation of the sintered body and the performance can be obtained. Moreover, since it becomes possible to further raise the joint strength of a sintered compact, it contributes also to improving the heat-transfer performance of the adsorption device 1 further.

(Second Embodiment)
In the second embodiment, an adsorber using a porous heat transfer body using another form of copper powder will be described with reference to FIGS. 19 to 22. Points that are not particularly described in the second embodiment are the same as those in the first embodiment. FIG. 19 is a schematic diagram illustrating the shape of metal powder used in the porous medium according to the second embodiment. FIG. 20 is a graph showing the relationship between the copper powder of the second embodiment and the establishment range of the product shown in FIG. FIG. 21: is the graph which showed the formation range of the product regarding the ratio of the median diameter of a copper powder and the median diameter of an adsorbent, and the parameter of a copper powder bulk density about the copper powder of 2nd Embodiment. FIG. 22 is a graph showing a more preferable product establishment range regarding the ratio of the median diameter of the copper powder to the median diameter of the adsorbent and the copper powder bulk density parameter for the copper powder of the second embodiment. Points that are not particularly described in the second embodiment are the same as those in the first embodiment.

  The copper powder according to the second embodiment is formed in a scale shape, a leaf shape, or the like. The scale-like copper powder 23b1 has a shape as shown in FIG. 19, for example.

  The conditions under which formation of a sintered body can be ensured when copper or copper alloy powder is used as the metal powder 23b1 will be described with reference to Table 2 and FIGS. The inventor of the present application has obtained knowledge that there is a condition that a sintered body cannot be formed depending on the particle diameter or bulk density of copper powder as a result of diligent research, experiments, investigations, etc. when copper powder is used. .

  The inventor of the present application then changes the physical properties such as the median diameter [μm] of the copper powder to be used, the bulk density [g / cc] of the copper powder, and the median diameter [μm] of the adsorbent. Experiments were conducted to verify whether or not the formation of a knot was possible. The verification results are as shown in (Table 2) below.

  The copper powder used in this verification was prepared by subjecting the copper powder produced by the atomization method, electrolysis method, pulverization method, chemical reduction method and the like to further crushing. The crushing step is, for example, a step of crushing the copper powder obtained by the atomizing method with a member such as a roller to form the copper powder into a thin piece.

The definition of the median diameter [μm] of the copper powder, the median diameter [μm] of the adsorbent, and the calculation method of the median diameter are as described in the first embodiment. In addition, in Table 2, FIGS. 20-22, the data regarding dendritic copper powder other than the data regarding scaly copper powder are shown for comparison.

  20 to 22, the verification results shown in Table 2 are obtained by dividing the bulk density of copper powder [g / cc] on the vertical axis and the median diameter of the copper powder on the horizontal axis by the median diameter of the adsorbent. This is a plot with the values set to In FIG. 20 to FIG. 22, “x” is plotted for the result that the sintered body cannot be formed, and “◯” is plotted for the result that the sintered body could be formed.

  20 to 22, the larger the bulk density (vertical coordinate) of the copper powder is, the denser the copper powder is. For example, the branch-like portion of the dentrite-like copper powder is in a short stomach state, and is a scaly shape. The copper powder is in a small state. Conversely, in the figure, the smaller the bulk density (vertical axis coordinate) of the copper powder, the more the copper powder is provided in a rough state. For example, the branch-like portion of the dentlite-like copper powder is in a long state. The powder is in a large state. Moreover, it is a state with large copper powder, so that a horizontal axis coordinate is large in a figure.

  The rectangle shown in FIG. 20 is the rectangle shown in FIG. 17 described in the first embodiment. In FIG. 20, the data of scaly copper powder show the result that a sintered body can be formed even in the outer region of this rectangle, as shown by the circle with diagonal lines. That is, in the case of a product using scaly copper powder, a production limit line indicating whether or not the sintered body in the adsorber 1 can be manufactured or an allowable line for product performance may exist outside each side of the rectangle. I understand.

  The inside of the rectangle illustrated in FIG. 21 is a range where a sintered body can be formed, and the outside of the rectangle is a range where a sintered body cannot be formed. That is, each side of the rectangle indicates a production limit line indicating whether or not the sintered body in the adsorber 1 can be manufactured or an allowable line for product performance. Thus, in the case of scaly copper powder, the upper limit of the ratio of the median diameter of the copper powder to the median diameter of the adsorbent is compared with the case of the dendritic copper powder of the first embodiment illustrated in FIG. It is possible to enlarge the line.

  The inventor of the present application has obtained the following knowledge by this verification. If the value obtained by dividing the median diameter of the scaly copper powder by the median diameter of the adsorbent is less than 0.8, the particle diameter of the copper powder is small relative to the particle diameter of the adsorbent, Due to the presence, the sintered bonding is not performed properly, and a sintered body having the required strength cannot be formed. On the other hand, when the particle size is larger than 6.5, the particle size of the copper powder is larger than the particle size of the adsorbent, and a phenomenon occurs in which the adsorbent 24 falls off between the copper powder particles. A filled porous heat transfer body cannot be formed, and sufficient adsorption capacity cannot be obtained. Further, if the bulk density of the scaly copper powder is less than 0.4, the scaly shape becomes large, so that the phenomenon in which the adsorbent 24 falls off easily occurs, and it is considered that sufficient adsorption capacity cannot be obtained. . On the other hand, when the ratio is larger than 1.6, the scale shape becomes smaller, so that the adsorbent 24 becomes in the way and the sintered bonding cannot be performed properly, and a sintered body having a required strength cannot be formed. It is done.

In order to eliminate the above problems, according to the results shown in FIG. 21, the establishment range of the product based on the formation of the sintered body is such that the vertical axis coordinate is 0.4 or more and 1.6 or less, and the horizontal axis The coordinates were required to be 0.8 or more and 6.5 or less. Therefore,
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
It is preferable that the product satisfies both of the relational expressions.

  Thus, if the product is set with each parameter, it is possible to eliminate the problems in forming the sintered body and the performance, and it is possible to provide the adsorber 1 having excellent product properties that achieves both adsorption capacity and product properties. .

Further, FIG. 22 is a graph showing the formation range of products that can obtain a more preferable state of sintering than FIG. According to FIG. 22, the more preferable formation range of the product based on the formation of the sintered body is that the coordinate of the vertical axis is 0.6 or more and 1.5 or less, and the coordinate of the horizontal axis is 0.9 or more and 6.0 or less. It can be seen that it is.
Therefore,
0.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.0,
And 0.6 ≦ bulk density of copper powder [g / cc] ≦ 1.5
It is further preferable that the product satisfies both of the relational expressions.

  Thus, if it is a product in which each parameter mentioned above is set, the adsorption machine 1 which can eliminate more reliably the malfunction on sintered compact formation and a performance will be obtained. Moreover, since it becomes possible to further raise the joint strength of a sintered compact, it contributes also to improving the heat-transfer performance of the adsorption device 1 further.

(Third embodiment)
Features similar to those of the adsorber 1 according to the present invention can be applied to the heat exchanger 100 shown in FIG. FIG. 23 is a schematic cross-sectional view showing a schematic structure of a heat exchanger 100 having the same characteristics as those of the adsorber 1. Hereinafter, the heat exchanger 100 according to the third embodiment will be described.

  The heat exchanger 100 exchanges heat between the adsorbent contained in the sintered body 120 and the heat exchange medium passing through the second flow path 190. The sintered body 120 corresponds to the porous heat transfer body 23 and the adsorbent 24 provided in the peripheral portion 22 of the heat medium pipe in the first embodiment. When the adsorbent adsorbs water vapor (first fluid), which is an adsorbed medium in the gas phase, water, which is the adsorbed medium in the liquid layer, is evaporated, and the heat exchange medium (second fluid) is cooled by the latent heat of evaporation. Is done. Further, when the adsorbent is heated by a high-temperature heat exchange medium, water vapor adsorbed on the adsorbent is desorbed from the adsorbent. The heat exchanger 100 includes a heat exchange unit 101 that exchanges heat between the first fluid and the second fluid, a housing 130 that houses the heat exchange unit 101, a lid member 131 that closes an opening of the housing 130, and a housing 130. A flow pipe 150 connected to the heat exchange section 101, and an inflow pipe 160 and an outflow pipe 170 connected to the heat exchange unit 101.

  The heat exchange unit 101 is configured by stacking a plurality of plate members 110. The plate member 110 is a circular metal plate member, and is formed of, for example, copper. In the plate member 110, a joint portion 111 is formed over the entire outer periphery. The joining part 111 is an annular plane.

  A sintered body 120 formed by sintering metal powder is joined to the outer surface 112 of the member forming the second flow path 190 over the entire surface. The sintered body 120 is obtained by sintering a mixed powder obtained by mixing a metal powder and an adsorbent, and the sintered body 120 is metallically bonded to the outer surface 112 and receives heat from the outer surface 112, or It is a heat transfer body that radiates heat to the outer surface. In this embodiment, copper powder is used as the metal powder that forms the sintered body 120.

  The adsorbent contained in the sintered body 120 adsorbs or desorbs the first fluid in the gaseous state, and adsorbs or desorbs water in the gaseous state, that is, water vapor. The adsorbent adsorbs the first fluid in a gaseous state when the temperature is lowered by releasing heat to the held sintered body 120, and desorbs the first fluid in the gaseous state when the temperature is increased by receiving heat from the sintered body 120. To do.

  The pair of plate members 110 are stacked with the bottom 113 facing each other and the outer surface 112 facing outside to constitute the suction module 103. Specifically, the pair of plate members 110 are joined by bringing the joint portions 111 into contact with each other, thereby dividing the first flow path 180 through which the first fluid flows and the second flow path 190 through which the second fluid flows. ing. The second flow path 190 is sealed over the entire circumference in the cross section in the flow direction of the second fluid by the joint portion 111. The sintered body 120 is disposed outside the adsorption module 103.

  A metallic fin 140 is disposed inside the suction module 103 and is metallically coupled to the inner surface of the suction module 103. A plurality of the adsorption modules 103 are stacked with the outer surfaces 112 facing each other to form the heat exchange unit 101. Each adsorption module 103 is joined and integrated by brazing. A first flow path 180 is formed between the adsorption modules 103. The first flow path 180 is a passage for allowing the first fluid to flow over the entire area of the sintered body 120 between the sintered bodies 120 joined to the outer surface 112.

  A heat exchange unit 101 configured by stacking a plurality of adsorption modules 103 includes a core unit 102, a distribution tank 104, and a collection tank 105. The core portion 102 transfers the heat of the second fluid to the adsorbent through the outer surface 112 of the bottom portion 113 and the sintered body 120 to increase the temperature of the adsorbent, or heat the adsorbent to the sintered body 120. And, it has a function of reducing the temperature of the adsorbent by transferring heat to the second fluid via the outer surface 112 of the bottom 113.

  An inflow pipe 160, which is a pipe member that supplies the second fluid to the heat exchange unit 101, extends in the stacking direction of the plate members 110 and is connected to the distribution tank 104. The distribution tank 104 distributes the second fluid flowing in from the inflow pipe 160 to the second flow path 190 formed in the core portion 102. An outflow pipe 170 that is a pipe member that discharges the second fluid from the heat exchange unit 101 extends in the same direction as the direction in which the plate members 110 are stacked and the inflow pipe 160 extends. Has been. The collecting tank 105 collects the second fluid from the second flow path 190 formed in the core portion 102 and flows it out from the outflow pipe 170.

  The second fluid flowing in from the inflow pipe 160 is distributed to the plurality of second flow paths 190 by the distribution tank 104. The second fluid that has passed through the plurality of second flow paths 190 gathers in the collecting tank 105 and flows out from the outflow pipe 170. The second flow path 190 through which the second fluid passes is formed between the plate members 110 sealed by the joint portion 111. The heat exchange unit 101 generates heat between the second fluid that flows through the second flow path 190 divided into a plurality of flow paths in the core part 102 and the first fluid that flows through the first flow path 180 in the core part 102. Let them exchange. The housing 130 is a bottomed box member that accommodates the heat exchange unit 101 therein. The bottom surface of the housing 130 is circular. The inner surface of the housing 130 is not in contact with the heat exchange unit 101, and a circulation space 181 through which the first fluid flows is formed between the inner surface of the housing 130 and the heat exchange unit 101.

  The lid member 131 is a planar plate member, and is joined to an opening formed in a flange shape of the housing 130 to close the opening of the housing 130. The lid member 131 fixes the flow pipe 150, the inflow pipe 160 and the outflow pipe 170 that pass through the lid member 131. The lid member 131 holds the heat exchange unit 101 through the inflow pipe 160 and the outflow pipe 170.

  The flow pipe 150 is a pipe member that communicates the flow space 181 in the housing 130 with a storage tank (not shown) in which the first fluid is stored in a liquid state. The first fluid in a gas state is circulated through the circulation pipe 150 between the housing 130 and the storage tank. The lid member 131 closes the opening of the housing 130 to make the first flow path 180 in the housing 130 in a substantially vacuum state.

(Other embodiments)
In the above-described embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. It is.

  In the first embodiment described above, the water vapor passage 25 is arranged in a region surrounded by the three heat medium pipes 21 as shown in FIG. 1. However, the present invention is not limited to this form. For example, FIG. As in a schematic cross-sectional view showing a first modification of the adsorber 1, the adsorber 1 may be arranged in a region surrounded by the four heat medium tubes 21. Further, the water vapor passage 25 may be arranged in a region surrounded by five or more heat medium tubes 21.

  The cross-sectional shape of the water vapor passage 25 may be any passage that is formed in the peripheral portion 22 and through which fluid can flow. For example, as shown in FIG. 25, adjacent to the case where the cylindrical heat medium tubes 21 are arranged in a staggered manner. It may be a gap passage formed between the matching peripheral portions 22. FIG. 25 is a schematic cross-sectional view showing an adsorber according to a second modification.

DESCRIPTION OF SYMBOLS 1 ... Adsorber 21 ... Heat-medium pipe | tube 22 ... Peripheral part of a heat-medium pipe | tube 23 ... Porous heat exchanger 23a ... Pore 23b ... Metal powder, copper powder 24 ... Adsorbent

Claims (6)

Porous heat transfer body (23) having a plurality of heat medium pipes (21) through which a heat exchange medium flows and having pores (23a) formed in the peripheral part (22) of the heat medium pipe (21) and adsorption An adsorber (1) provided with an agent (24),
The porous heat transfer body (23) is formed by metal bonding of metal powder (23b) to the heat medium pipe (21) by sintering, and the adsorbent (24) is contained in the pores (23a). Filled,
A gap formed between the porous heat transfer body (23) and the heat medium pipe (21) and the pores (23a),
The thickness L [mm] of the adsorbent packed layer formed by filling the adsorbent (24) in the peripheral portion (22) of the heat medium pipe (21) is in the range of 0.5 ≦ L ≦ 6. Set,
The weight of the metal powder (23b) filled in the peripheral part (22) is Mg [kg], the weight of the adsorbent is Ma [kg], and the peripheral part filled with the metal powder (23b) ( 22) When the filling volume is Fv [m ³ ] and the density of the metal powder (23b) is ρ [kg / m ³ ], the porosity Mo of the void is Mo = 1− (Mg / (Fv Xρ)), and
It is set in the range of 0.7 ≦ Mo ≦ 0.95, and the weight ratio Rg of the metal powder is represented by Rg = Mg / (Mg + Ma),
Furthermore, 0.1732exp (−0.01Mo) ln (L) + 3.902exp (−3.43Mo) ≦ Rg ≦ 6.8 × 10 ⁻⁵ exp (7.4Mo) ln (L) + 1.316exp (−0 .48Mo)
An adsorber characterized by satisfying the relational expression of   The adsorber according to claim 1, wherein the metal powder (23b) is a powder formed of copper or a copper alloy. For each of the metal powder formed from the copper or the copper alloy and the adsorbent, the median diameter of 50% of the cumulative diameter in the particle diameter distribution is the median diameter of the copper powder and the median of the adsorbent. The diameter,
When the adsorbent is mixed and the copper powder produced by the electrolytic method or the atomizing method is sintered and bonded to the heat medium pipe (21),
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 3.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
The adsorber according to claim 2, wherein: Further, 0.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 1.9
And 0.6 ≦ bulk density of copper powder [g / cc] ≦ 1.5
The adsorber according to claim 3, wherein: For each of the metal powder formed from the copper or the copper alloy and the adsorbent, the median diameter of 50% of the cumulative diameter in the particle diameter distribution is the median diameter of the copper powder and the median of the adsorbent. The diameter,
When further pulverizing the copper powder produced by the atomization method, electrolytic method, pulverization method, chemical reduction method, and mixing the adsorbent and sinter-bonded to the heat medium pipe (21),
0.8 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.5
And 0.4 ≦ bulk density of copper powder [g / cc] ≦ 1.6
The adsorber according to claim 2, wherein: Further, 1.9 ≦ (median diameter of copper powder) / (median diameter of adsorbent) ≦ 6.0
And 0.6 ≦ bulk density of copper powder [g / cc] ≦ 1.5
The adsorber according to claim 5, wherein:

Images