JP2012093067A - Hybrid chiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient original cooling efficiency utilizing water spray nozzles or the like, by increasing the heat exchange area of a heat exchanger to improve heat exchange efficiency and energy saving performance from the standpoint of constructing a free cooling function and by solving the problems that a hybrid chiller is enlarged.SOLUTION: A heat exchanger 3 in a second cooling system M2 is constructed by the combination of four heat exchange board part 3a, 3b, 3c and 3d. The heat exchange board part 3a, 3b, 3c and 3d are arranged in an X shape by bringing one sides thereof close to one another. In four spaces Sab, Sbc, Scd and Sda formed by the four heat exchange board parts 3a, 3b, 3c and 3d, optional two spaces Sab and Scd in opposing positional relationship are made to be communicated with the air inlet 6 of a casing 5, and the other two spaces Sbc and Sda are made to be communicated with the air outlet 7 of the casing 5.

Description

  The present invention relates to a hybrid chiller having a free cooling function for exchanging heat between outside air and coolant.

  Conventionally, as a hybrid chiller having a free cooling function that directly uses a low-temperature environment of outside air, a cooling device disclosed in Patent Literature 1 and a cooling device disclosed in Patent Literature 2 are known.

  The former cooling device has the same plate fin tube type in which the cooling water coil for cooling the cooling water and the condenser coil for cooling the refrigerant of the refrigerator are placed in the cooling tower provided with the blower for the purpose of improving the cooling efficiency. Install a heat exchange unit that is piped inside the heat exchanger. When the outside air temperature is low, stop the operation of the refrigerator and pass only the cooling water into the heat exchange unit. When the outside air temperature is high, operate the refrigerator. The cooling water is passed only through the evaporator of the refrigerator, only the refrigerant of the refrigerator is passed through the heat exchange unit, and either the cooling water or the refrigerant is cooled by the cooling tower according to the outside air temperature, Further, the latter cooling device is similarly used to increase the cooling efficiency. In the cooling tower in which the fluid to be cooled is passed through the heat transfer pipe and the heat transfer pipe is cooled by a fan, the heat transfer partition through which the fluid to be cooled passes is provided. A radiator with fins is installed on the outside of the cooling tower, and it consists of a compressor, a condenser, an expansion valve, and an evaporator. A chiller that repeatedly compresses and expands the refrigerant is installed. It is installed in a condenser with fins and is placed inside the radiator.The cooling tower fan blows air to the radiator and condenser, and the cooled fluid returning from the equipment to be cooled is cooled from the radiator through the chiller evaporator and cooled. It can be sent out to the device that should be.

Japanese Patent Laid-Open No. 7-234055 JP 2000-266447 A

  However, this type of conventional hybrid chiller, including the cooling device (hybrid chiller) disclosed in Patent Documents 1 and 2 described above, has the following problems.

  First, since it has a free cooling function that uses the low temperature environment of the outside air as it is, it is possible to increase the heat exchange area (cooling efficiency) by increasing the heat exchange area of the heat exchanger that exchanges heat between the outside air and the coolant as much as possible. Although desirable, the conventional cooling device is not necessarily sufficient from the aspect of increasing the heat exchange area in the heat exchanger, and enhances the heat exchange efficiency and energy saving of the heat exchanger responsible for the free cooling function. There was room for further improvement from the point of view.

  Secondly, when the outside air is not in a sufficiently low temperature environment, the cooling capacity is usually increased by using the latent heat generated when the water mist evaporates by spraying water upstream of the heat exchanger in the air blowing direction. However, it is difficult to secure an appropriate arrangement space for the watering nozzle (watering mechanism) used at this time. That is, in order to spread the mist sprayed from the watering nozzle over a wider range of the heat exchanger, it is desirable to arrange the watering nozzle at an upstream position to some extent away from the heat exchanger. Since there is no appropriate installation space upstream, it is necessary to secure a separate installation space when installing the watering nozzle, which leads to an increase in the overall size of the apparatus and the original use of the watering nozzle. There is a possibility that sufficient cooling capacity cannot be secured.

  The object of the present invention is to provide a hybrid chiller that solves such problems in the background art.

  In order to solve the above-described problems, the present invention heats heat exchange between the first cooling system M1 using the cooling device 2 that cools the cooling liquid L and the outside air W blown by the blower fan 4 and the cooling liquid L. A hybrid chiller 1 including a second cooling system M2 having an exchanger 3 and a control system Mc that performs control to cool the coolant L using at least the first cooling system M1 or the second cooling system M2 is configured. At this time, the heat exchanger 3 in the second cooling system M2 is constituted by a combination of four heat exchange plates 3a, 3b, 3c, 3d, and one side of each heat exchange plate 3a, 3b, 3c, 3d. Are arranged in an X shape by being close to each other, and are in a mutually opposing positional relationship in the four spaces Sab, Sbc, Scd, and Sda partitioned by the four heat exchange disk portions 3a, 3b, 3c, and 3d. Any two spaces S b, Scd a communicated with the blower inlet 6 of the casing 5, and the other two spaces Sbc, characterized by comprising a communicates with the air blowing outlet 7 of the casing 5 Sda.

  In this case, according to a preferred aspect of the invention, each of the heat exchange board portions 3a, 3b, 3c, 3d can be arranged in an X shape in a plan view or a side view. On the other hand, the cooling device 2 is constituted by a refrigeration cycle C having a condenser 8, and causes each heat exchange platen 3 a, 3 b, 3 c, 3 d to face the condenser 8 from the upstream side in the blowing direction Fw of the blower fan 4. Can be arranged. The condenser 8 is constituted by a combination of two condensing unit parts 8x and 8y bent in a U-shape, and is disposed with the central mountain folded parts Ex and Ey facing each other, and four heat exchange panels. The parts 3a, 3b, 3c, 3d can be respectively disposed at both side positions of the mountain-folded parts Ex, Ey in the two condensing unit parts 8x, 8y. On the other hand, the blower fan 4 can be disposed at a position shared with the two spaces Sbc and Sda communicating with the blower outlet 7. Further, when the air inlet 6 is provided, the side surface air inlets 6s and 6t can be provided on the side panel portions 5s and 5t of the casing 5, and the upper surface air inlets 6su and 6tu can be provided on the upper surface panel portion 5u.

  According to the hybrid chiller 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) The heat exchanger 3 in the second cooling system M2 is configured by a combination of four heat exchange disk portions 3a ..., and one side of each heat exchange disk portion 3a ... And any two spaces Sab in opposing positional relations in the four spaces Sab defined by the four heat exchange disk portions 3a communicate with the air inlet 6 of the casing 5, and Since the other two spaces Sbc are communicated with the air outlet 7 of the casing 5, the heat exchange area of the heat exchanger 3 can be increased as much as possible from the viewpoint of constructing a free cooling function. The heat exchange efficiency of 1 and further energy saving can be further improved.

  (2) Since four spaces Sab... Partitioned by the four heat exchange disc portions 3a... Are formed, a sufficient arrangement space can be secured on the upstream side in the blowing direction Fw with respect to the heat exchanger 3. Thereby, for example, when disposing a watering nozzle (watering mechanism), it is possible to select an optimum position where mist caused by watering can be diffused in a wider range without separately providing an installation space. Therefore, the problem that the hybrid chiller 1 becomes large can be avoided, and the original cooling capacity using an attached mechanism such as a watering nozzle can be sufficiently secured.

  (3) According to a preferred embodiment, each of the heat exchange board portions 3a can be arranged in an X shape in a plan view or a side view, so that the position of the air inlet 6 is selected as the side panel portion of the casing 5. In addition, the direction and quantity of the air outlet 7 can be flexibly selected (set) in accordance with the use environment and the like. Moreover, since each heat exchange board part 3a ... can be arrange | positioned in the diagonal line position of the casing 5 in planar view or side view, it can contribute to size reduction of the hybrid chiller 1.

  (4) According to a preferred embodiment, the cooling device 2 is constituted by a refrigeration cycle C having a condenser 8, and each heat exchange panel 3 a... Faces the condenser 8 from the upstream side in the blowing direction Fw of the blower fan 4. If arranged in such a manner, there is no dead space when the condenser 8 and the respective heat exchange panels 3a... Are arranged, which can contribute to the overall miniaturization and can easily realize the common use of the blower fan 4. In addition, since the temperature of the heat exchange board 3a is usually lower than the temperature of the condenser 8, more efficient heat exchange can be performed in consideration of the blowing direction Fw.

  (5) According to a preferred embodiment, the condenser 8 is constituted by a combination of two condensing unit portions 8x and 8y bent in a U-shape, and the central mountain fold portions Ex and Ey are arranged to face each other. If the four heat exchanging disk units 3a are respectively disposed at both side positions of the mountain folding parts Ex and Ey in the two condensing unit parts 8x and 8y, the assemblability and the mechanical rigidity at the time of assembling are improved. In addition, the positioning of the condenser 8 and the heat exchanger 3 can be performed easily and accurately.

  (6) If the blower fan 4 is disposed at a position shared with the two spaces Sbc and Sda communicating with the blower outlet 7 according to a preferred embodiment, basically one blower fan 4 is sufficient. This contributes to the overall size reduction, cost reduction and power saving.

  (7) According to a preferred embodiment, when the air inlet 6 is provided, the side air inlets 6s and 6t are provided in the side panel portions 5s and 5t of the casing 5, and the upper surface air inlets 6su and 6tu are provided in the upper panel portion 5u. The entire area of the air inlet 6 can be increased, and the direction in which the outside air W flows can be selected. Therefore, the optimum installation mode of the hybrid chiller 1 can be selected. For example, if only the upper surface air inlets 6su and 6tu are selected, a plurality of hybrid chillers 1 can be connected and used without any gaps.

The typical perspective view which specifies the principal part of the hybrid chiller concerning the suitable embodiment of the present invention, A schematic sectional plan view clearly showing the main part of the hybrid chiller, A partially cutaway front view of the heat exchange board part provided for the hybrid chiller, The side view which expands and fractures and shows the lower part of the heat exchange board part with which the hybrid chiller is equipped A schematic perspective view clearly showing the air flow path of the hybrid chiller, System diagram of the hybrid chiller, A flowchart showing the operation of the hybrid chiller; The principle diagram for explaining the superiority of the hybrid chiller, Connection system diagram when using multiple hybrid chillers, The typical side view which specifies the principal part of the hybrid chiller concerning the change embodiment of the present invention, The typical front view showing the principal part of the hybrid chiller concerning other change embodiments of the present invention,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the overall structure of the hybrid chiller 1 according to the present embodiment will be described with reference to FIGS. 1 to 6 and FIG.

  As shown in FIG. 1, the hybrid chiller 1 includes a casing 5 that is formed in a rectangular parallelepiped shape as a whole, and the upper interior of the casing 5 is configured as a heat exchange chamber Rc, and the lower interior is configured as a storage chamber Ri. A condenser 8 of the first cooling system M1 and a heat exchanger 3 of the second cooling system M2 are disposed inside the heat exchange chamber Rc. In this case, as shown in FIG. 6, the condenser 8 becomes a part of the refrigeration cycle C in which the refrigerant circulates, and the refrigeration cycle C constitutes the cooling device 2 in the first cooling system M1. On the other hand, as shown in FIG. 6, the heat exchanger 3 constitutes a second cooling system M2 that performs heat exchange between the outside air W and the coolant L. The cooling device 2 (first cooling system M1) and the second cooling system M2 both have a function of cooling a coolant L described later, and in particular, the second cooling system M2 has a free cooling function.

  Further, as shown in FIG. 2, the condenser 8 is constituted by a combination of two condensing unit portions 8x and 8y bent in a U-shape, and is disposed with the central mountain fold portions Ex and Ey facing each other. . Therefore, the overall shape of the condenser 8 in plan view is X-shaped. One condensing unit portion 8x has a general condenser structure, that is, a refrigerant pipe unit in which a refrigerant pipe through which a refrigerant is passed is formed in a zigzag shape, and a large number of heat radiation fins are attached to the center of the refrigerant pipe unit. It has a form that is bent into a square shape. The other condensing unit portion 8y is configured in the same manner as the condensing unit portion 8x, and the two condensing unit portions 8x and 8y are used in parallel connection.

  On the other hand, the heat exchanger 3 is constituted by a combination of four heat exchange boards 3a, 3b, 3c, 3d, and by bringing one side of each heat exchange board 3a, 3b, 3c, 3d close to each other, X Arrange in shape. Therefore, as shown in FIG. 2, the four heat exchange board portions 3a, 3b, 3c, and 3d are disposed so as to face the both side positions of the mountain-folded portions Ex and Ey in the two condensing unit portions 8x and 8y, respectively. The X shape does not mean a strict X shape, but is a concept that includes various shapes that are similar to the X shape and can exhibit the functions and effects of the present invention. In this case, each heat exchange board part 3a ... is distribute | arranged to the upstream in the ventilation direction Fw of the ventilation fan 4 mentioned later with respect to each condensation unit part 8x, 8y. Thus, if each heat exchange board part 3a ... is made to face the condenser 8 (condensing unit part 8x, 8y) from the upstream in the ventilation direction Fw of the ventilation fan 4, the condenser 8 and each heat exchange board part The dead space when 3a ... is arrange | positioned is lose | eliminated, and while being able to contribute to size reduction of the whole, sharing of the ventilation fan 4 is easily realizable. In addition, since the temperature of the heat exchange board 3a is usually lower than the temperature of the condenser 8, more efficient heat exchange can be performed in consideration of the blowing direction Fw.

  As shown in FIG. 3 and FIG. 4, one heat exchange disk unit 3 a prepares a plurality of (one for example, five) one-pass Pp in which the coolant pipe 11 through which the coolant L passes is formed in a zigzag shape. A plurality of heat dissipating fins 12 are attached to the outer peripheral surface of a plurality of paths Pp arranged in sequence to constitute a unit heat exchange panel Cs, and as shown in FIG. 3, two unit heat exchange panels Cs. , Cs are connected in the vertical direction to constitute the heat exchanging panel 3a. In this case, as shown in FIG. 4, the one-pass Pp is a flow located above the coolant pipe 11 so that the coolant L does not remain inside when the coolant L flows out due to natural fall. From the outlet 11e to the inflow port 11i located on the lower side, consideration is given to the downward inclination or the horizontal in all parts. The other heat exchange board portions 3b, 3c, and 3d are configured in the same manner as the heat exchange board portion 3a.

  Each unit heat exchange panel Cs includes an inflow side header portion 13i and an outflow side header portion 13e, and connects the inflow ports 11i of each path Pp ... to the inflow side header portion 13i. The outflow ports 11e are connected to the outflow side header portion 13e. It should be noted that the inflow side header portions 13i and the outflow side header portions 13e in the unit heat exchange panels Cs. In this case, the inflow side header part 13i and the outflow side header part 13e in the upper unit heat exchange panel part Cs and the inflow side header part 13i and the outflow side header part 13e in the lower unit heat exchange panel part Cs are connected to each other. In addition, a freezing prevention air supply valve 14 using an electromagnetic on-off valve or the like is connected to the upper end of the outflow side header portion 13e in the upper unit heat exchange panel Cs, and the upper end of the inflow side header portion 13i is terminated. It is set as the obstruction | occlusion structure so that it may become. And inflow side header part 13i ... in each heat exchange board part 3a, 3b, 3c, 3d and outflow side header part 13e ... are connected in parallel.

  The two heat exchanger units 3a, 3b, 3c, and 3d attached to the two condenser units 8x and 8y and the respective condenser units 8x and 8y constitute the bottom surface of the heat exchange chamber Rc as shown in FIG. Installed (fixed) integrally on the bottom panel Rcd. At this time, the condenser 8 is constituted by a combination of two condensing unit portions 8x and 8y bent in a U-shape, and the central mountain fold portions Ex and Ey are arranged to face each other, and four heat exchanges are performed. Since the board portions 3a are respectively arranged on both side positions of the mountain folding portions Ex, Ey in the two condensing unit portions 8x, 8y, the assembling property and further the mechanical rigidity at the time of assembling can be improved. Positioning relating to the condenser 8 and the heat exchanger 3 can also be performed easily and accurately.

  In this case, each heat exchange board part 3a, 3b, 3c, 3d is arrange | positioned in the diagonal line position of the casing 5 in planar view, as shown in FIG. Thus, since each heat exchange board part 3a ... can be arrange | positioned in the diagonal line position of the casing 5 in planar view, it can contribute to size reduction of the hybrid chiller 1. FIG. And, the two spaces Sab, Scd that are in a positional relationship facing each other in the four spaces Sab, Sbc, Scd, Sda partitioned by the four heat exchanger units 3a, 3b, 3c, 3d are on the air inlet side, Side air inlets 6s and 6t into which the outside air W flows are formed in the side panel portions 5s and 5t located on the left and right sides of the casing 5 facing the spaces Sab and Scd, respectively.

  Further, a blower outlet 7 is formed at the center of the upper panel portion 5u of the casing 5, and upper blower inlets 6su and 6tu are formed on both sides of the blower outlet 7, respectively. In this case, the air outlet 7 communicates with the remaining two spaces Sbc and Sda from above. Thus, since the ventilation inlet 6 is comprised by the total four opening of the side surface ventilation inlets 6s and 6t of the side panel parts 5s and 5t, and the upper surface ventilation inlets 6su and 6tu of the upper surface panel part 5u, the whole ventilation inlet 6 is comprised. Can be made larger, and the direction of inflow of the outside air W can be selected, so that the optimum installation mode of the hybrid chiller 1 can be selected. For example, if only the upper surface air inlets 6su and 6tu are selected, a plurality of hybrid chillers 1 can be arranged and used without gaps (see FIG. 9).

  On the other hand, an air cooling fan 4 is disposed inside the air outlet 7. Thereby, the blower fan 4 is shared by the two spaces Sbc and Sda communicating with the blower outlet 7. Thus, if the blower fan 4 is disposed at a position shared with the two spaces Sbc and Sda communicating with the blower outlet 7, basically one blower fan 4 is sufficient. Can contribute to energy saving, cost reduction and power saving. Therefore, in order to construct such a ventilation path, as shown in FIG. 5, by attaching triangular horizontal partition plates 15s and 15t to the upper ends of the condensing unit portions 8x and 8y, two spaces Sab and Scd are formed. The vertical partition plates 16s and 16t are erected upward from the end sides of the horizontal partition plates 15s and 15t located on the air inlets 6s and 6t side, and the upper ends of the vertical partition plates 16s are blown out from the top panel portion 5u. 7 and the upper surface air inlet 6su, and the upper end of the vertical partition plate 16t is brought into contact with the inner surface between the air outlet 7 and the upper surface air inlet 6tu in the upper panel portion 5u, thereby partitioning the space, The side air inlets 6s and 6t communicate with the spaces Sab and Scd from the side, respectively, and the upper surface air inlet 6su. 6tu the spatial Sab, communicated from above respectively Scd, horizontal partition plate 15s, 15 t and the vertical partition plate 16s, 16t by the blowing outlet 7 side (space Sbc, Sda side) is cut off from. The white arrow in FIG. 5 indicates the blowing direction Fw.

  On the other hand, on the bottom panel Rcd in the spaces Sab and Scd facing the air inlet 6, water spray nozzles 18 s and 18 t constituting the water spray mechanism 18 are provided for the respective heat exchange boards 3 a, 3 b, 3 c and 3 d. It is located at an appropriate distance and is located upstream of the blowing direction Fw. Each of the water spray nozzles 18s and 18t is disposed toward the heat exchange board portions 3a, 3b, 3c, and 3d so that water can be sprayed obliquely upward, and in particular, an optimum position that can diffuse in a wider range is selected. The watering mechanism 18 has a function of further increasing the cooling capacity by watering from the watering nozzles 18s and 18t. That is, the blast is further cooled by using the water temperature of the mist by watering and the latent heat at the time of evaporation.

  By the way, since the hybrid chiller 1 according to the present embodiment includes the heat exchanger 3 configured in the X shape, the hybrid chiller 1 has the following advantages (advantages). 8 (as) to 8 (ds) show various forms of heat exchangers 3, 3r... Including the prior art. This figure (as) shows this embodiment provided with the heat exchanger 3 arranged in the X-shape, and the same figure (bs) shows two heat exchangers 3r disclosed in Patent Document 2 described above arranged in parallel on both sides. The most common parallel opposed configuration, FIG. (Cs) is a frame configuration in which two heat exchangers 3r are further added to the remaining end side with respect to the configuration of FIG. (Bs), and FIG. The two heat exchangers 3r disclosed in Patent Document 1 described above are arranged in a V shape. Moreover, the displayed numerical value has shown the area ratio of each heat exchanger 3,3r .... As is clear from this, when the area of the X form according to the present embodiment shown in FIG. 10 (as) is “1.0”, the area of the parallel opposed form shown in FIG. ”, The area of the V form shown in FIG. 6 (ds) is“ 0.8 ”, and the area ratio is about 20 to 30% smaller than that of the X form. On the other hand, the area of the frame form shown in FIG. 6Cs is “1.3”, and the area ratio is about 30% larger than that of the X form. On the other hand, the following problems occur.

  That is, in this type of hybrid chiller 1, it is necessary to dispose the watering nozzles 18s and 18t in the watering mechanism 18 at an upstream position (appropriate position) that is appropriately separated from the heat exchangers 3, 3r. FIGS. 8A to 8Dm show a case where the watering nozzles 18s and 18t are attached to the above-described forms shown in FIGS. As is clear from this, the X form according to the present embodiment shown in the figure (as) and the V form shown in the figure (ds) can secure an appropriate position without changing the form. Moreover, the parallel facing form shown to the same figure (bs) can also ensure an appropriate position, without changing an area ratio, if the position of the heat exchanger 3r is changed. However, in the case of the frame form shown in FIG. 10Cs, in order to secure an appropriate position, it is necessary to change the position of the heat exchanger 3r and to reduce the size of the heat exchanger 3r. It becomes small to about 0.8 ". Moreover, the watering nozzles 18 s... Cannot be employed from a practical point of view, for example, because they need to be disposed at a total of four locations. Eventually, the X-shaped heat exchanger 3 (condenser 8) according to the present embodiment is the most desirable form from the viewpoint of securing a sufficient heat exchange area and securing the appropriate positions of the water spray nozzles 18s and 18t.

  On the other hand, FIG. 6 shows an entire system circuit of the hybrid chiller 1 according to the present embodiment. In FIG. 6, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the configuration is clarified.

  In FIG. 6, reference numeral 1 denotes a hybrid chiller, and reference numeral 50 denotes a portion to be cooled such as a machine tool that is cooled by the coolant L supplied from the hybrid chiller 1 by being connected to the hybrid chiller 1. In the hybrid chiller 1, M1 represents a first cooling system, and M2 represents a second cooling system having a free cooling function.

  The first cooling system M1 is configured by the cooling device 2 using the refrigeration cycle C including the condenser 8 described above, and the refrigeration cycle C can be configured by a general refrigeration cycle in which the refrigerant K circulates. Reference numeral 22 denotes a compressor. The discharge port of the compressor 22 is connected to the refrigerant inlet of the condenser 8, and the return port of the compressor 22 is a cooler (heat exchanger) that exchanges heat between the refrigerant K and the coolant L. ) Connected to the refrigerant outlet of the primary side 23f at 23. Further, the refrigerant inlet on the primary side 23 f in the cooler 23 is connected to the refrigerant outlet of the condenser 8 via the electronic expansion valve 24. Thereby, the refrigerating cycle C through which the refrigerant K circulates is configured. Reference numeral 25 denotes a hot gas bypass circuit connected to the control valve 25v, which is connected between the discharge port of the compressor 22 and the refrigerant outlet of the electronic expansion valve 24. Reference numeral 22i denotes a compressor inverter.

  Further, the coolant inlet on the secondary side 23 s in the cooler 23 is connected to the second coolant tank 21 s of the coolant tank 21 via the pressure pump 29 and the coolant outlet on the secondary side 23 s in the cooler 23. Is connected to the coolant supply port 27s to which the cooled part 50 is connected. The coolant return port 27r to which the cooled part 50 is connected is connected to the first coolant tank 21f of the coolant tank 21. The cooling liquid tank 21 is partitioned into a first cooling liquid tank 21f and a second cooling liquid tank 21s by a partition wall 21p, and the supernatant of the cooling liquid L in the first cooling liquid tank 21f covers the upper edge of the partition wall 21p. It has a structure to get over and enter the second coolant tank 21s. Reference numeral 28 denotes an on-off valve connected between the coolant supply port 27s and the coolant return port 27r.

  On the other hand, the second cooling system M2 includes the heat exchanger 3 described above, and the coolant inlet of the heat exchanger 3 is connected to the first coolant tank 21f of the coolant tank 21 via the circulation pump 26. At the same time, the coolant outlet of the heat exchanger 3 is connected to the second coolant tank 21 s of the coolant tank 21. Reference numeral 18 denotes a watering mechanism, and the watering nozzles 18s and 18t described above are connected to the water pipe side via a watering valve 31 using an electromagnetic on-off valve or the like.

  On the other hand, reference numeral 41 denotes a controller that constitutes a main part of the control system Mc. The controller 41 has a function for controlling the entire hybrid chiller 1. Various setting items such as a set temperature Ts (for example, 20 [° C.]) of the coolant L are set in the controller 41. Further, at least the compressor inverter 22i described above is connected to the control output port of the controller 41, and the blower fan 4, the electronic expansion valve 24, the circulation pump 26, the pumping pump 29, the control valve 25v, the air supply valve 14, and the water spray. Connect the valve 31. Furthermore, an external air dry bulb temperature sensor 42 t, an outdoor air wet bulb temperature sensor 42 w, a chiller outlet temperature sensor 43, a return temperature sensor 44, and a heat exchanger outlet temperature sensor 45 are connected to the input port of the controller 41. Thus, the temperature (outside air temperature) Tt of the outside air W that is the outside air dry bulb temperature is detected from the outside air dry bulb temperature sensor 42t, the outside air wet bulb temperature Th is detected from the outside air wet bulb temperature sensor 42w, and the chiller outlet temperature is detected. A chiller outlet temperature Te is detected from the sensor 43, and a return liquid temperature Tr is detected from the return temperature sensor 44 and is applied to the controller 41. The controller 41 has a computer function including a CPU and various memories, and executes temperature control (sequence control) related to at least the hybrid chiller 1. Therefore, the controller 41 stores a control program for realizing temperature control, and cools the coolant L by the second cooling system M2 at least when the outside air temperature Tt is lower than the set temperature Ts of the coolant L. A control function for performing control is provided.

  Since the hybrid chiller 1 includes such a system circuit, the housing Ri of the casing 5 described above includes components of the refrigeration cycle C (first cooling system M1) excluding the condenser 8 and the heat exchanger 3. The components in the second cooling system M2 such as the circulation pump 26 are disposed, and the above-described coolant tank 21 and the pressure pump 29 for supplying the coolant L to the cooled part 50 are disposed.

  Next, the operation of the hybrid chiller 1 according to the present embodiment will be described with reference to the flowchart shown in FIG.

  First, the pumping pump 29 starts operation when the hybrid chiller 1 is powered on (step S1). Due to the operation of the pressure feed pump 29, the coolant L in the second coolant tank 21 s in the coolant tank 21 passes through the pressure feed pump 29, the secondary side 23 s of the cooler 23, and the coolant supply port 27 s to be cooled 50 To be supplied. Thereby, the cooled part 50 is cooled by the cooling liquid L, and the cooling water L warmed by heat exchange is returned into the first cooling liquid tank 21f in the cooling liquid tank 21 through the cooling liquid return port 27r. It is.

  On the other hand, the controller 41 monitors the chiller outlet temperature Te, the return liquid temperature Tr, the outside air temperature Tt, and the wet bulb temperature Th. At this time, if the chiller outlet temperature Te is higher than the preset temperature Ts of the coolant L and the return fluid temperature Tr is equal to or lower than the outside air temperature Tt, normal chiller operation control (control of the cooling device 2). The feedback control is performed so that the chiller outlet temperature Te becomes the set temperature Ts (steps S2, S3, S4).

  At this time, when the chiller outlet temperature Te is higher than the set temperature Ts and the outside air temperature Tt is lower than the return liquid temperature Tr, the operation control for the circulation pump 26 is performed without performing the chiller operation control (step S3). S5). By the operation of the circulation pump 26, the coolant L in the first coolant tank 21 f in the coolant tank 21 is returned to the second coolant tank 21 s in the coolant tank 21 via the circulation pump 26 and the heat exchanger 3. It is. If the chiller outlet temperature Te becomes equal to or lower than the set temperature Ts during the operation control of the circulation pump 26, the operation of the circulation pump 26 is stopped (steps S6, S7, S8).

  On the other hand, if the chiller outlet temperature Te is higher than the set temperature Ts during the operation control of the circulation pump 26, the operation control for the blower fan 4 is performed (steps S6 and S10). At this time, if the chiller outlet temperature Te becomes equal to or lower than the set temperature Ts, the operation of the blower fan 4 is stopped (steps S11, S12, S13). Also, during the operation control of the blower fan 4, when the chiller outlet temperature Te is higher than the set temperature Ts and the outside air temperature Tt is higher than the outside air wet bulb temperature Th, the watering valve 31 is switched to the open side, and the watering nozzle Water is sprayed from 18s and 18t (steps S11, S14, S15). Thereby, the cooling capability is further enhanced by utilizing the water temperature of the mist caused by water spraying and the latent heat when evaporating. When the water spray valve 31 is switched to the open side, if the chiller outlet temperature Te falls below the set temperature Ts, the water spray valve 31 is switched to the closed side (steps S16 and S17).

  Further, if the chiller outlet temperature Te becomes higher than the set temperature Ts when the water spray valve 31 is open, or if the outside air temperature Tt becomes equal to or lower than the wet bulb temperature Th when the water spray valve 31 is closed, the operation control of the compressor 22 is performed. Performed (steps S14, S16, S18). At this time, if the chiller outlet temperature Te becomes equal to or lower than the set temperature Ts, the operation of the compressor 22 is stopped (steps S19, S20, S21). If the hybrid chiller 1 is turned off during operation of the circulation pump 26, the blower fan 4, and the compressor 22, all operations are stopped (steps S7, S12, S20, and S9).

  Therefore, according to the hybrid chiller 1 according to the present embodiment, the heat exchanger 3 in the second cooling system M2 is configured by a combination of the four heat exchange plate portions 3a, and each heat exchange plate portion. Arbitrary two spaces that are arranged in an X shape by bringing one side of 3a ... close to each other and are in a mutually opposing positional relationship in the four spaces Sab ... partitioned by each of the four heat exchange board portions 3a ... Since Sab is communicated with the air inlet 6 of the casing 5 and the other two spaces Sbc are communicated with the air outlet 7 of the casing 5, heat exchange of the heat exchanger 3 is performed from the viewpoint of constructing a free cooling function. The area can be increased as much as possible, and the heat exchange efficiency and further energy saving of the hybrid chiller 1 can be further improved. In addition, since four spaces Sab... Partitioned by the four heat exchange disk portions 3a... Are formed, a sufficient arrangement space can be secured on the upstream side in the blowing direction Fw with respect to the heat exchanger 3. Thereby, when arranging the watering nozzles 18s and 18t, it is possible to select an optimum position where the mist due to watering can be diffused in a wider range without separately providing an installation space. Therefore, the problem that the hybrid chiller 1 becomes large can be avoided, and the original cooling capacity using the attached mechanisms such as the watering nozzles 18s and 18t can be sufficiently secured.

  Next, a hybrid chiller 1 according to a modified embodiment of the present invention will be described with reference to FIGS.

  FIG. 9 shows an example in which a plurality of (three examples) hybrid chillers 1 are connected and used. Since the hybrid chiller 1 according to the present embodiment is assumed to be used for a cooled part 50 such as one machine tool, for example, when the cooled part 50 becomes a large facility or the like, The hybrid chiller 1 has insufficient capacity. Therefore, in this case, a plurality of hybrid chillers 1 can be connected and used. When connecting, the cooling liquid L supplied to the to-be-cooled part 50 uses the cooling liquids L to be supplied from the plurality of hybrid chillers 1... And the cooling liquid L returned from the to-be-cooled part 50. Is a case where the flow rate is biased because the flow is divided with respect to the plurality of hybrid chillers 1. Therefore, when a plurality of hybrid chillers 1 are connected and used, the electric valves 61 are connected to the pipes connected to the coolant return ports 27r of each hybrid chiller 1. By attaching a water level sensor 62 to the coolant tanks 21 in 1 to detect the water level of the coolant L in the coolant tanks 21 and to be able to communicate with each other between the controllers 41. The electric valves 61 can be driven and controlled by the controllers 41 so that the water levels of the coolants L in the coolant tanks 21 are equalized.

  In the modified embodiment shown in FIG. 10, the arrangement form of the blower fan 4 is changed. The embodiment shown in FIG. 1 shows the case where the blower fan 4 is disposed inside the casing 5 formed in a rectangular parallelepiped shape, but the modified embodiment shown in FIG. 10 is the outside of the casing 5, that is, the casing 5. A wind tunnel portion 71 is provided on the upper surface panel portion 5u, and a blower fan 4e is disposed inside the wind tunnel portion 71. Therefore, in this modified embodiment, since the wind tunnel portion 71 including the blower fan 4e can be attached to the upper panel portion 5u via the attachment means 72 such as a bolt, the wind tunnel portion 71 including the blower fan 4e is installed on the upper surface as necessary. For example, it is possible to remove the panel portion 5u and attach it to the wall surface of the building and connect the wind tunnel portion 71 and the upper surface panel portion 5u of the wall surface with a separate duct. Can be set flexibly.

  In the modified embodiment shown in FIG. 11, the mounting form of the heat exchanger 3 and the evaporator 8 is changed. That is, the embodiment shown in FIG. 1 is configured such that the heat exchanger 3 (and the evaporator 8) is X-shaped in plan view, but the modified embodiment shown in FIG. The evaporator 8) is configured to have an X shape in a side view (including a front view), so to speak, a vertical installation is changed to a horizontal installation. Therefore, this modified embodiment is the same as the embodiment shown in FIG. 1 in that the side air inlets 6s and 6t are provided in the pair of side panel portions 5s and 5t, respectively, but the air blow shown in FIG. The outlet 7 can be provided as the air outlets 7a and 7b in both the front panel portion 5f and the rear panel portion 5r. Thereby, the upper surface panel part 5u can be comprised as a flat surface without an opening, and internal penetration | invasion of dust etc. from the upper surface panel part 5u can be avoided. In this case, if the blower fan is disposed only on one side, the embodiment is the same as the embodiment shown in FIG. 1, but in the modified embodiment of FIG. 11, the two blower fans 4a and 4b are disposed on both sides. Therefore, there is no bias toward the one side of the air blow Fw.

  Thus, since each heat exchange board part 3a ... can be arrange | positioned in X shape in planar view or side view, even if it is a case where the position of the ventilation inlet 6 is selected as the side panel part of the casing 5, The direction and quantity of 7 can be flexibly selected (set) according to the use environment. Moreover, since each heat exchange board part 3a ... can be arrange | positioned in the diagonal line position of the casing 5 also in side view, it can contribute to size reduction of the hybrid chiller 1. FIG.

  The preferred embodiment (modified embodiment) has been described in detail above. However, the present invention is not limited to such an embodiment, and the gist of the present invention in the configuration, shape, material, quantity, and the like of details. Any change, addition, or deletion can be made without departing from.

  For example, although the case where each heat exchange board part 3a ... is arrange | positioned in the diagonal line position of the casing 5 in planar view or side view was shown, the case where it arrange | positions in positions other than a diagonal line position is not excluded. Moreover, although the case where the cooling device 2 was constituted by the refrigeration cycle C was shown, the case where it is constituted by another cooling system such as a thermo module using a Peltier element is not excluded. Therefore, when the thermo module is used, the condenser 8 is not necessary. Furthermore, although the case where the heat exchanging disk units 3a are arranged so as to overlap or be close to the condenser 8 has been shown, the case where they are arranged apart from each other is not excluded. On the other hand, the case where the condenser 8 is configured by a combination of two condensing unit parts 8x and 8y bent in a U-shape has been shown. However, as in the case of the heat exchange board part 3a, four condenser units are shown. You may comprise by a part, and you may comprise as a continuous single unit. Similarly, in the case of the heat exchanger 3, not only is it configured by a combination of four heat exchangers as a single unit, but both sides of the bent portion of the single heat exchanger that is bent into a dogleg shape. It may be used as two heat exchangers 3a ..., or one heat exchanger formed in an X shape by bending a single coolant pipe into a so-called one-stroke shape, respectively. 3a ... may be used. Therefore, the heat exchange board part is a concept including a case where a plurality of heat exchange board part areas are partitioned with respect to a single (one block) board.

  The hybrid chiller according to the present invention can be used by being connected to various parts to be cooled such as machine tools that need to be cooled by circulating a coolant.

DESCRIPTION OF SYMBOLS 1: Hybrid chiller, 2: Cooling device, 3: Heat exchanger, 3a: Heat exchange board part, 3b: Heat exchange board part, 3c: Heat exchange board part, 3d: Heat exchange board part, 4: Blower fan, 5 :casing,
5s: Side panel part, 5t: Side panel part, 5u: Top panel part, 6: Air inlet, 6s: Side air inlet, 6t: Side air inlet, 6su: Top air inlet, 6tu: Top air inlet, 7: Air Outlet, 8: Condenser, 8x: Condensing unit, 8y: Condensing unit, L: Coolant, M1: First cooling system, M2: Second cooling system, Mc: Control system, W: Outside air, Sab: Each Space partitioned by the heat exchanger plate, Sbc: Space partitioned by each heat exchanger plate, Scd: Space partitioned by each heat exchanger plate, Sda: Space partitioned by each heat exchanger plate, C : Refrigeration cycle, Fw: Air blowing direction, Ex: Mountain fold, Ey: Mountain fold

Claims (6)

  A first cooling system using a cooling device for cooling the cooling liquid, a second cooling system having a heat exchanger for exchanging heat between the outside air blown by the blower fan and the cooling liquid, and at least the first cooling system or A hybrid chiller comprising a control system for performing control to cool the coolant using the second cooling system, wherein the heat exchanger in the second cooling system is a combination of four heat exchange panels. And is arranged in an X shape by bringing one side of each of the heat exchange panel portions close to each other, and in a positional relationship opposite to each other in the four spaces defined by the four heat exchange panel portions. A hybrid chiller characterized in that any two of the spaces are communicated with a blower inlet of a casing, and the other two spaces are communicated with a blower outlet of the casing.   2. The hybrid chiller according to claim 1, wherein each of the heat exchange panels is arranged in the X shape in a plan view or a side view.   The said cooling device is comprised by the refrigerating cycle which has a condenser, and each said heat exchange board part is arrange | positioned facing the said condenser from the upstream in the ventilation direction of the said ventilation fan, It is characterized by the above-mentioned. The hybrid chiller according to 1 or 2.   The condenser is constituted by a combination of two condensing unit parts bent in a U-shape, and is arranged with a central mountain fold part facing each other, and four heat exchange board parts are arranged in the two condensing parts. The hybrid chiller according to claim 3, wherein the hybrid chiller is disposed on each side of the mountain fold portion in the unit portion.   The hybrid chiller according to any one of claims 1 to 4, wherein the blower fan is arranged at a position shared with the two spaces communicating with the blower outlet.   The hybrid chiller according to any one of claims 1 to 5, wherein the air inlet includes a side air inlet provided in a side panel portion of the casing and a second air inlet provided in an upper panel portion.

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