JP2015045461A - Thermal storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal storage device which facilitates temperature control of a thermal storage medium by utilizing natural energy, and, when required, can recover hot air or cool air without uselessly dissipating stored hot air or cool air.SOLUTION: A thermal storage device includes a housing constituted by a heat insulation material, and a thermal storage container which is provided inside the housing and in which a latent thermal storage medium having a phase-change temperature of 20°C-30°C is enclosed. Inside the housing, there are provided a connection port which can be connected to an air distribution duct, an exhaust port, and a distribution passage through which air can be transferred.

Description

  The present invention relates to a heat storage device that mainly stores solar heat and nighttime cold air (stores heat), holds the heat for a certain period of time, and can be taken out as necessary.

  A technique for storing solar heat and night-time cold (storage) and utilizing the heat is widely known. For example, in Patent Literature 1, a ceiling surface material provided with a latent heat storage material, specifically, a house having a passive cold storage function (using solar heat) by installing a board made of a heat storage building material or a heat storage material. Proposed. However, the heat storage material remains exposed, for example, is not sealed in a heat-insulating housing, and the stored hot air dissipates into the room against the resident's intention and cannot be used when necessary. There are challenges.

  Patent Document 2 discloses a regenerative cold air device having a housing having an air inlet and a blower, a blower that blows air inside the housing, and a regenerator pack that cools the air passing through the housing. Is described. A heat insulating material is provided inside the housing. And this apparatus sets a cold storage agent (cool storage agent cooled to -18 degreeC) cooled by a domestic freezer etc. each time, and is used as a cold winder. With such a configuration, the housing is characterized in that the condensed water generated during heat exchange does not flow out.

JP 2002-115343 A JP-A-9-257352

  However, the heat storage material described in Patent Document 1 is not covered with a heat-insulating housing, but the corners and stored heat dissipate indoors against the resident's intention, and are utilized when necessary. It is a system that can not.

  Further, the cold air device described in Patent Document 2 is premised on setting a cold storage agent cooled in a home freezer or the like and using it as a cold air machine. Therefore, this apparatus cannot be used as it is for a system that uses solar heat or night cold. That is, this device is premised on the use of a cold storage agent that has already been conditioned (conditioning), and like the heat storage device that is the subject of the present invention, it is completely different from the technical idea of achieving both temperature adjustment and heat dissipation. Because it is different. Furthermore, there is no description or suggestion of applying a material that changes phase in a temperature range (20 to 30 ° C.) suitable for the indoor environment as the heat storage material.

  Accordingly, an object of the present invention is to provide a heat storage device that can easily adjust the temperature of a heat storage material using natural energy, and can take out hot and cold air when necessary without wastefully discharging accumulated hot and cold air. It is to provide.

  According to the present invention, the heat storage device is provided with a casing made of a heat insulating material (hereinafter referred to as a heat insulating casing) and the inside of the casing, and the latent heat storage with a phase change temperature of 20 ° C. to 30 ° C. The housing is provided with a heat storage container in which a material is enclosed, and a connection port (hereinafter referred to as a duct connection port) that can be connected to an air flow duct, an exhaust port, and a flow path through which air can be transferred are provided inside the housing. It has been.

  As described above, the natural energy is taken in from the duct, so that the temperature of the heat storage material can be adjusted, and the heat stored in the heat insulating casing is hardly released. The reason why the phase change temperature of the latent heat storage material is set to 20 ° C. to 30 ° C. is that if the room temperature is 20 ° C. to 30 ° C. throughout the seasons, a comfortable daily life can be spent, and the room temperature is 24 ° C. to 28 ° C. If it is ℃, a particularly optimal living environment can be obtained.

  The heat-insulating housing is preferably formed of foamed plastic having a thickness of at least 20 mm. Furthermore, it is preferable that a locking portion for inserting and holding the heat storage container is formed inside the heat insulating casing. The heat-insulating housing according to the present invention cannot be obtained with sufficient strength at the time of production and attachment when the thickness is less than 20 mm, and the upper limit of the thickness is appropriately selected in consideration of strength, ease of handling and economy. Is done. The structure of the locking portion is selected from shapes such as grooves, recesses, and protrusions.

  It is also preferable that at least one connection port and exhaust port that can be connected to the air circulation duct are formed in the heat insulating casing. Furthermore, the size of the duct connection port is preferably 75 mm to 300 mm in diameter. The heat insulating casing according to the present invention is provided with a duct connection port and an exhaust port on the side surface of the casing (rectangular box). A port and an exhaust port may be provided. Further, if the diameter of the duct connection port is less than 75 mm, a sufficient air flow cannot be secured, and if it exceeds 300 mm, the duct becomes large and the cost is increased.

  It is also preferable that a chamber is provided between the duct connection port formed in the heat insulating casing and the flow path.

  The latent heat storage material is also preferably a mixture of a higher alkane having 9 to 23 carbon atoms and a higher alcohol having 6 to 20 carbon atoms. The latent heat storage material according to the present invention selects the organic mixture having a specific number of carbon atoms, greatly reducing the variation of melting / solidification existing in each substance alone, and the heat or cold heat and latent heat of the outside air. Heat exchange with the heat storage material can be performed efficiently, and a sufficient melting action and solidification action can be obtained.

  The heat storage device according to the present invention has various technical effects and economic effects derived from the technical effects. That is, in the heat storage device according to the present invention, by transferring air, the heat or cold heat of natural air, which is natural energy, is stored in the latent heat storage material in the heat storage container, so that the heat is stored when necessary relatively easily. The room temperature can be adjusted by taking out In addition, since the indoor temperature can be adjusted using outside air, it is energy saving and economical. Furthermore, it has excellent effects such as a relatively simple structure and easy manufacture. In addition, the other effect of this invention is demonstrated also in description of embodiment.

1 is a perspective view schematically showing a heat storage device according to a first embodiment of the present invention. It is a perspective view which shows roughly the thermal storage container shown to FIG. 1a. It is a perspective view which shows roughly the heat storage apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows typically the heat resistant housing | casing of 2nd Embodiment of FIG. It is explanatory drawing which shows roughly the air conditioning system using the heat storage apparatus which concerns on this invention. It is explanatory drawing which showed typically the house which installed the thermal storage apparatus which concerns on this invention. It is explanatory drawing which shows roughly the thermal storage apparatus which concerns on the change aspect of 2nd Embodiment of FIG.

(First embodiment)
Hereinafter, based on FIG. 1a and FIG. 1b, the thermal storage apparatus S which concerns on the 1st Embodiment of this invention is demonstrated.

  In FIG. 1 a, three flat heat storage containers 2 are installed in the lower part of the rectangular heat insulating casing 1. The heat insulating casing 1 is made of a foamed plastic having heat insulating properties, and a duct connection port 3 for connecting to an air circulation duct (not shown) is provided on the side surface (right wall surface in FIG. 1). Further, an exhaust port 4 (the same shape as the duct connection port 3 in the figure) is formed on the left wall surface.

  In addition, grooves 6 as locking portions for inserting and holding the heat storage container 2 shown in FIG. 1b are formed at regular intervals on the inner wall surface (front and rear wall surfaces in FIG. 1a) of the heat insulating housing 1. . However, in FIG. 1a, the groove 6 is formed in 10 steps. The heat storage container 2 is inserted and locked in at least a part of the groove 6. By setting the heat storage container 2 with a gap of a constant interval, this gap (a gap of 15 mm in FIG. 1 a) functions as an air flow path 5.

  For example, in the present embodiment, the outer shape of the heat insulating housing 1 is 580 mm × 280 mm × 505 mm, and ten heat storage containers 2 having dimensions of 180 mm × 280 mm × 34 mm can be disposed therein. ing. Air enters from the duct connection port 3 and flows toward the exhaust port 4 via the distribution path 5.

  The heat-insulating housing 1 uses a No. 2 equivalent of a beaded polystyrene foam heat insulating plate specified in JIS A 9511, and has a thickness of about 50 mm and a heat insulating property (λ) of about 0.037 W / mk. It is a product. However, the material of the heat-insulating housing 1 is not limited to this, and it is also possible to manufacture with a foamed plastic heat insulating material such as extruded polystyrene and foamed polypropylene or a fiber heat insulating material such as high-density glass wool. . However, a foamed plastic that is easy to mold (manufacture), has high heat insulation, is resistant to moisture, and has strength as in this embodiment is suitable.

  The heat insulating casing 1 is essential for enhancing the heat storage effect of the latent heat storage material in the heat storage container 2 and holding the heat stored in the latent heat storage material. The thickness of the heat insulating housing 1 is appropriately designed according to the necessary holding time of the stored heat and the heat insulating properties of the heat insulating material, and the groove 6 is integrally formed in the wall portion of the heat insulating housing 1 as in this embodiment. If the heat storage container 2 is formed and held in the grooves 6, a certain thickness is required to form the grooves. In addition, the casing is required to have a strength required to hold the heat storage container, and if the heat retaining property is taken into consideration, a thickness of 20 mm or more is required.

  The duct connection port 3 is provided on the right side surface of the heat-insulating housing 1 (in this embodiment, a hole having a diameter of 150 mm). This is air heated by solar heat or cold at night in a house where a heat storage device is installed. It is for connecting the circular duct (not shown) for distribute | circulating the air cooled by this. And this heat storage apparatus S utilizes these heat | fever as temperature control (conditioning) of the latent heat storage material in the thermal storage container 2. FIG.

  Further, the duct connection port 3 needs to communicate with a flow path 5 formed inside the heat insulating casing 1, and air flowing in from the duct connection port 3 passes through the flow path 5 and is sent out from the exhaust port 4. It can be done. And it is possible to store heat in the latent heat storage material in the heat storage container 2 in the process of passing air through the distribution channel.

  The size of the duct connection port 3 is practically preferable from φ75 mm to φ300 mm. In the present embodiment, the exhaust port 4 is also configured to be connected to a circular duct and has a hole of φ150 mm, but it does not have to be circular and may be rectangular or elliptical. In an extreme case, the exhaust port 4 having an opening on the almost entire surface may be used.

  As shown in FIG. 1 a, it is preferable to provide a chamber 7 having a certain amount of space between the heat storage container 2 and the duct connection port 3 arranged inside the heat insulating casing 1. By providing such a chamber 7, the air that has flowed in is branched or dispersed into the flow path 5 formed between the heat storage containers 2, and the overall heat exchange rate is increased. In the present embodiment, a space of 200 mm is formed between the heat storage container 2 and the duct connection port 3. The chamber 7 communicates with a flow path 5 formed between the heat storage containers 2.

  At least one flat heat storage container 2 in which a latent heat storage material is enclosed is disposed inside the heat insulating casing 1, and as described above, ten heat storage containers 2 can be disposed in this embodiment. The heat storage container 2 is arranged so as to be in sufficient contact with the air that has flowed in through the duct connection port 3 and to exchange heat with the air more efficiently.

  The heat storage container 2 of the present embodiment is made of a vinyl chloride blow-molded product, but is not limited to such plastic, and may be made of metal such as aluminum. It is also possible to use a tube having a constant length (for example, an aluminum tube having a diameter of 10 to 30 mm) sealed at the end as the heat storage container 2, and a fin may be attached to the outside (side in contact with air) of the tube. . Further, in this case, the pipes can be assembled in advance at regular intervals (taken through a distribution route). Furthermore, a structure such as a radiator may be manufactured in advance. In this case, the heat storage container 2 and the flow path 5 are integrally formed, and the heat storage device S is formed by arranging the heat storage container 2 and the distribution path 5 in the heat insulating casing 1. In addition, a radiator is generally used as a radiator, and it has not been considered so far to enclose it in a heat insulating casing.

  The heat storage container 2 is filled with a latent heat storage material having a phase change temperature (melting point or freezing point) according to the purpose of use, which is an inorganic material such as sodium sulfate + hydrate (sodium salt), sodium acetate, or paraffin Organic materials such as fatty acids are used as appropriate.

  The heat storage device S of the present embodiment is assumed to be used to maintain the indoor environment of a house, and is conditioned (conditioned) with natural energy (air) such as air heated by solar heat or cold at night. The main purpose is that. Therefore, a latent heat storage material having a phase change temperature of 20 ° C. to 30 ° C. is optimal, and for this, a product mainly composed of a mixture of a higher alkane having 9 to 23 carbon atoms and a higher alcohol having 6 to 20 carbon atoms is used. Is preferred. Among these, although not particularly limited, since the phase change temperature is 20 to 22 ° C., a mixture of n-octadecane (higher alkane having 18 carbon atoms) and lauryl alcohol (higher alcohol having 12 carbon atoms) is preferable. It is particularly preferable that the molar fraction of lauryl alcohol in the mixture is 65 to 89 mol% from the viewpoint of reducing and stabilizing the behavioral behavior at the time. In addition, since the phase change temperature is 26 to 28 ° C., a mixture of n-octadecane (higher alkane having 18 carbon atoms) and myristyl alcohol (higher alcohol having 14 carbon atoms) is also preferable, and the behavior during phase change varies. From the viewpoint of reducing and stabilizing, it is particularly preferable that the molar fraction of myristyl alcohol in these mixtures is 10 to 39 mol%. It is possible to adjust the melting temperature while maintaining the high latent heat of higher alkanes and higher alcohols, and mixing / predetermining both of them results in melting / solidification that occurs when each of higher alcohols and higher alkanes is a simple substance. It is possible to greatly reduce the variation of the above.

  In addition, although this heat storage device selected the latent heat storage material on the assumption that it installs in a place with low risk of fire (such as under the floor) in a house, organic materials are generally easy to burn. When this risk is high (when installed indoors), the amount of heat storage and durability (the degree of deterioration when the phase change is repeated) are slightly inferior, but inorganic materials such as a mixture of sodium nitrate and urea Is appropriately selected.

  Next, the manufacturing method (assembly method) of the heat storage device S in the present embodiment will be described based on FIG.

  The heat storage device S of the present embodiment is configured such that the heat insulating casing 1 can be divided into two on the surface indicated by the dividing line L. Therefore, in assembling this apparatus, the half heat insulating casings 11 and 12 are prepared in advance, the heat storage container 2 is attached to the groove 6 of one heat insulating casing (for example, the right casing 11), and the remaining half A heat insulating housing (left housing 12) is joined to complete.

  When assembling, halved heat-insulating housing and heat storage container are sent separately to the site and assembled in the above procedure. By doing so, not only can the logistics cost be reduced, but the handling of a heat storage container in which a relatively heavy latent heat storage material is sealed (in the embodiment, the weight of one heat storage container is about 1 kg, and 10 is 10 kg) is easy. Become. On the other hand, if the heat insulating casing is made of a beaded foamed plastic and is transported in a state where the heat storage container is attached to the groove, there is a concern that problems such as breakage of the groove occur. Further, even when the heat storage container is replaced due to aging or the like, it can be removed / attached relatively easily.

(Second Embodiment)
Next, a heat storage device SS according to a second embodiment of the present invention will be described based on FIGS. 2 and 3.

  The first embodiment is a heat storage device S in which air flows in one direction (on FIG. 1, air flows from the right side to the left side), but in the second embodiment, air flows in two directions (front and rear, left and right). (XY direction). However, in FIG.2 and FIG.3, the component same as FIG. 1 attaches | subjects the same code | symbol, and the description is abbreviate | omitted.

  As shown in FIG. 2, the heat storage device SS is provided with a duct connection port, an exhaust port, an intake port, and an exhaust port on four side surfaces of the heat insulating casing 21. That is, a duct connection port 211 for connecting to an air circulation duct (not shown) is provided on the first side surface (the right front wall surface in FIG. 2) of the heat-insulating housing 21 on the second side surface (in FIG. 2). An exhaust port 212 (the same shape as the duct connection port 211) is formed in the left rear wall surface, an intake port 221 is formed in the third side surface (the left front wall surface in FIG. 2), and a fourth side surface (the right rear wall surface in FIG. 2). ) Has an exhaust port 222 formed therein. Further, grooves 6 as locking portions for inserting and holding the heat storage container 2 are formed at regular intervals on the inner wall surface. A plurality of heat storage containers 2 are inserted and locked in these grooves 6. In FIG. 2, the heat storage container 2 is not shown. By setting the heat storage container 2 with a gap of a constant interval, this gap functions as an air flow path.

  In particular, as shown in FIG. 2, the heat storage device SS in the present embodiment has a locking portion (groove 6 or notch) for inserting and attaching the heat storage container 2 inside the heat insulating casing 21 in the X direction. The heat storage container 2 is inserted into this locking portion and locked at this locking portion. Thereby, the flow path through which air flows from all sides is formed. In order to form a flow path in the X direction and the Y direction, for example, the illustrated X-direction platen board (plate that closes the flow path) 261 and the Y-direction platen board 262 are alternately arranged between the grooves 6. The Y direction mech plate 262 and the X direction mech plate 261 form the X direction flow channel 251 and the Y direction mech plate 261 alternately.

  When this heat storage device SS is used, air or the like heated by solar heat is taken in from the duct connection port 211, stored in the latent heat storage material in the heat storage container 2, and sent to the exhaust port 212 via a distribution path. The On the other hand, the stored heat is heat-exchanged with the air introduced from the intake port 221, and is sent to the exhaust port 222 via the distribution path. The duct connection port 211, the exhaust port 212, the intake port 221 and the exhaust port 222 of the present embodiment have the same shape (φ150 mm) as the duct connection port 211, but are connected to the air duct except for the duct connection port 211. It is not necessary to. In addition, since the air flows in two directions, the heat storage container 2 is preferably thinner than the first embodiment (about 10 to 20 mm) from the viewpoint of improving the heat exchange efficiency.

  Other configurations and operations of the heat storage device according to the present embodiment, the assembly method, and the like are substantially the same as those of the first embodiment described above.

  Next, an air conditioning system using the heat storage device according to the present embodiment will be described. First, the outline | summary of one form of the air-conditioning system which cools night cold air in the summer is demonstrated.

  FIG. 4 shows the cooler night air (cold air) that is cool from midnight to morning, and is stored by the heat storage device S according to the first embodiment during the day, and this cold air is stored in the room before going to bed at night. The structure of the air-conditioning system in the case of using it for the purpose of keeping a room comfortable by blowing out is represented.

  The heat storage device S is set so that the phase change temperature of the latent heat storage material enclosed in the heat storage container 2 shown in FIG. The duct connection port 3 of the heat storage device S is connected to the electric three-way shutter 410 via the heat insulation duct 431. The electric three-way shutter 410 is further connected to a duct 401 for taking outside air from outside and a duct 403 for taking air from indoors. Therefore, the duct connection port 3 functions as an intake port for outside air (cool air at night) or an intake port for room air by switching the electric three-way shutter 410. On the other hand, the exhaust port 4 of the heat storage device S is connected to the suction port of the duct fan 422 via the heat insulation duct 432. The discharge port of the duct fan 422 is connected to the electric three-way shutter 411 through the heat insulation duct 433. The electric three-way shutter 411 is further connected to a duct 402 for releasing air to the outdoors and an indoor exhaust duct 404. Therefore, the exhaust port 4 of the heat storage device S functions as an exhaust port for the outside air or an exhaust port for the room by switching the electric three-way shutter 411. Note that an air conditioning system (duct, shutter, fan, damper, etc.) including the heat storage device S shown in FIG. 4 is installed in the attic of a house.

  Next, the operation and usage pattern of the air conditioning system shown in FIG. 4 will be described.

  For example, in order to store cool air in the heat storage device S in the cooler time period from midnight in the summer to 6:00 in the morning (outside air of about 25 ° C.), both the electric three-way shutters 410 and 411 are used as outdoor outside air. And the duct fan 422 is operated. By operating the fan, outside air A is sucked from the outside through the heat insulation duct 431. The sucked outside air is transferred into the heat storage device S through the duct connection port 3 of the heat storage device S, and the lower temperature outside air A and the molten latent heat storage material (phase change temperature) enclosed in the heat storage container S are stored. (28 ° C.). The liquid latent heat storage material is cooled to the outside air to change into a solid phase, and the cold heat of the outside air is stored.

  Thereafter, the operation of the duct fan 422 is stopped from the morning until bedtime. Since the heat storage device S is surrounded by the heat insulating casing 1, the heat storage (cold storage) state of the latent heat storage material is maintained during this period. When sleeping, when the room is hot and the room temperature is high (for example, 30 ° C.), both electric three-way shutters 410 and 411 are switched to communicate with the room. When the duct fan 422 is operated in this state, the temperature is 28 ° C. or less. The cool air is sent into the room, and the room can be made a comfortable sleeping environment.

  In the above-described embodiment, the outline of the system for storing night cold air in summer has been described based on FIG. 4, but the heat storage device according to the present invention is assumed to be used in various ways and used as various air conditioning systems. Can do. As an example, during use in summer, there is a case where air in a room is exchanged by exchanging heat of relatively hot air in the daytime or bedtime with a heat storage device. This detailed description is omitted.

  Next, the outline | summary of one form of the air conditioning system which stores solar heat in winter as an air conditioning system using the thermal storage apparatus which concerns on this embodiment is demonstrated.

  As shown in FIG. 5, outside air B taken from one eaves 502 of a house 501 of a detached house is heated by a heat collector 504 installed on a roof 503, and the heat is conducted under a floor through a duct 505. Furthermore, it is introduced into the heat storage device SS in the second embodiment.

  In this type of conventional air conditioning system, the heat of the outside air B guided under the floor is stored in the concrete and radiated for floor heating. However, in such a conventional air conditioning system, the entire concrete is not covered with a heat insulating material, and the concrete also stores heat, but at the same time releases heat into the room. For example, floor heating is required especially during the daytime. Even when there is not, heat is dissipated. And even if it was going to use the stored heat at midnight, there was a problem that it had already radiated heat from the concrete and could not be used effectively.

  On the other hand, as shown in FIG. 5, if the heat storage device SS is installed instead of concrete heat storage, not only can the heat in the required temperature region be stored, but also the heat storage container disposed in the heat insulating casing. Since the latent heat storage material is enclosed, heat is not easily dissipated and can be taken out when necessary (for example, at night).

  That is, as shown in FIG. 5, the heat storage device SS is installed under the floor, the tip of the duct 505 installed in the house is joined to the duct connection port 211 of the heat storage device SS, and the air warmed by the heat collector is stored in the heat storage device. It is configured to flow in the X-direction distribution path of the apparatus, and heat is stored in the latent heat storage material in the heat storage container during the daytime. On the other hand, a duct fan (not shown) is attached to the front end of the exhaust port 222 of the heat storage device via a duct, and the air under the floor is taken into the heat storage device through the intake port 221 and below the floor via the Y-direction flow path. Blow out from. At this time, the heat stored in the heat storage material is exchanged with air flowing in the Y direction. As the heat storage material of this example, a material that changes phase at about 24 ° C. is selected.

  It is obvious that the number of heat storage devices SS used in the present system is not necessarily one, and two or more heat storage devices SS may be connected to each other.

  As described above, when the air at 25 ° C. to 60 ° C. warmed by the air heat collector during the winter day is drawn into the heat storage device SS, for example, when it is desired to use as floor heating at night, the exhaust port 222 Heat can be supplied from the heat storage device to warm the floor using a duct fan attached through a duct.

  As shown in FIG. 6, as the heat storage device SSS according to the modification of the second embodiment, a fan 601 may be directly attached to the exhaust port 222 without using a duct or the like, or A heat insulating damper 602 that opens and closes when the fan 601 rotates may be directly attached.

  In the above-described embodiment, the outline of the air conditioning system for storing warm air during the daytime in winter has been described based on FIG. 5 and FIG. 6, but the heat storage device according to the present invention is assumed to be used in various ways. Can be used for the system. For example, indoor air conditioning can be performed by exchanging heat of relatively warm air with a heat storage device during the daytime in winter. This detailed description is omitted.

  The heat storage device of the present invention can be used as a backbone device of an air conditioning system for buildings such as apartment houses, detached houses, offices, etc., has various uses, and has technical and economic effects.

1, 21 Heat-insulating housing 2 Heat storage container 3 Duct connection port 4 Exhaust port 5 Distribution path 6 Groove (locking part)
7 Chamber 11 Right housing 12 Left housing 211 Duct connection port 212 Exhaust port 221 Inlet port 222 Exhaust port 251 X direction flow route 252 Y direction flow route 261 X direction plate 262 Y direction plate 401, 402, 403, 404 Duct 410, 411 Shutter 422 Duct fan 431, 432, 433 Thermal insulation duct 501 House 502 Eaves 503 Roof 504 Heat collector 505 Duct 601 Fan 602 Thermal insulation damper A, B Air (outside air)
S, SS, SSS heat storage device

Claims (7)

  A housing composed of a heat insulating material, and a heat storage container provided inside the housing and enclosing a latent heat storage material having a phase change temperature of 20 ° C. to 30 ° C. Is provided with a connection port that can be connected to the air flow duct, an exhaust port, and a flow path through which air can be transferred.   The heat storage device according to claim 1, wherein the casing is made of foamed plastic having a thickness of at least 20 mm.   The heat storage device according to claim 1 or 2, wherein a locking portion for inserting and holding the heat storage container is formed inside the housing.   The heat storage device according to any one of claims 1 to 3, wherein the casing is formed with at least one connection port and an exhaust port that can be connected to an air circulation duct.   The heat storage device according to claim 4, wherein the duct connection port has a diameter of 75 mm to 300 mm.   The heat storage device according to any one of claims 1 to 5, wherein a chamber is provided between a duct connection port formed in the housing and a distribution path.   The heat storage device according to any one of claims 1 to 6, wherein the latent heat storage material is a mixture of a higher alkane having 9 to 23 carbon atoms and a higher alcohol having 6 to 20 carbon atoms.

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