Ejector cooling device

Abstract

In this ejector cooling device, a refrigerant outlet 14b of an exhaust heat recovery device 14, a drive inflow port 10a of an ejector 10, a discharge outflow port 10c of the ejector 10, and a refrigerant inlet 11a of a condenser 11 are disposed in a horizontal manner, and a drive flow pipe L1 connecting the refrigerant outlet 14b of the exhaust heat recovery device 14 to the drive inflow port 10a of the ejector 10 and a discharge flow pipe L2 connecting the discharge outflow port 10c of the ejector 10 to the refrigerant inlet 11a of the condenser 11 are disposed in straight-line arrangement. The drive flow pipe L1 connects the refrigerant outlet 14b of the exhaust heat recovery device 14 to the drive inflow port 10a of the ejector 10 in the shortest possible way, and the discharge flow pipe L2 connects the discharge outflow port 10c of the ejector 10 to the refrigerant inlet 11a of the condenser 11 in the shortest possible way.

Description

Ejector Cooling Device

[0001] The present invention relates to an ejector cooling device that can suppress deterioration of ejector performance while maintaining the compactness of the device.

[0002] The ejector cooling device is a cooling cycle device using an ejector. It uses heat source hot water such as factory waste warm water as a heating source, evaporates high-pressure refrigerant pressurized by a refrigerant pump by a waste heat recovery device, and generates a driving flow for the ejector. The driving flow is sent to the ejector, and the suction flow from the evaporator is pressurized by the action of the ejector. The pressurized refrigerant is sent to the condenser and cooled and liquefied by cooling water. The liquefied refrigerant is depressurized to a low-temperature two-phase refrigerant by passing through an expansion valve and sent to the evaporator. In the evaporator, heat can be absorbed from the outside during evaporation to generate cold heat such as cold water.

[0003] Here, Patent Document 1 describes that by tilting the ejector, the depth or width of an ejector-type refrigerator equipped with this ejector is reduced, and the ejector-type refrigerator is downsized.

[0004] Japanese Patent Application Laid-Open No. 2014-167377

[0005] Here, since the ejector effect varies due to pressure fluctuations before and after, when the piping connecting between the heat exchangers before and after becomes long, it leads to an increase in pressure loss and deterioration of ejector performance. In the above Patent Document No. 1, by tilting the ejector downward at an oblique angle, the device is downsized, and furthermore, the distance between the ejector and each heat exchanger is shortened to reduce the required piping length and suppress heat loss and pressure loss. However, when the ejector is tilted, the refrigerant outlet of the waste heat recovery device that generates the driving flow and the refrigerant inlet of the condenser into which the discharge flow flows are arranged vertically above and below in the vertical direction. As a result, the vertical arrangement becomes large and may hinder the compactness of the device. Moreover, since each heat exchanger (waste heat recovery device, condenser, evaporator) is arranged vertically, bending occurs in the connecting piping with each heat exchanger. Although the piping length becomes short, pressure loss will occur.

[0006] In view of the above circumstances, the present invention aims to provide an ejector cooling device that can suppress deterioration of ejector performance while maintaining the compactness of the device.

[0007] To achieve the above objective, the ejector cooling device according to the present invention comprises a pump for pressurizing a refrigerant, a heat recovery unit for heating the refrigerant with a heat source hot water to generate a drive flow, an expansion valve for reducing the pressure of the refrigerant, an evaporator for cooling a medium to be cooled with the refrigerant reduced in pressure by the expansion valve, an ejector for drawing in the refrigerant evaporated by the evaporator as a suction flow using the drive flow of the refrigerant from the heat recovery unit, and discharging a mixture of the drive flow and the suction flow, and a condenser for cooling the refrigerant discharged from the ejector, wherein the refrigerant outlet of the heat recovery unit, the drive inlet of the ejector, the discharge outlet of the ejector, and the refrigerant inlet of the condenser are arranged horizontally, and the drive flow piping connecting the refrigerant outlet of the heat recovery unit and the drive inlet of the ejector, and the discharge flow piping connecting the discharge outlet of the ejector and the refrigerant inlet of the condenser are arranged linearly in at least the portion of the piping connected to the ejector.

[0008] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, the drive flow piping and the discharge flow piping are arranged in a straight line.

[0009] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, the drive flow piping provides the shortest possible connection between the refrigerant outlet of the heat recovery unit and the drive flow inlet of the ejector, and the discharge flow piping provides the shortest possible connection between the discharge outlet of the ejector and the refrigerant inlet of the condenser.

[0010] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, at least one of the drive flow pipe and the discharge flow pipe is curved in the middle.

[0011] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, the drive flow pipe and the discharge flow pipe are each formed to curve in the same direction midway through their operation.

[0012] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, the refrigerant inlet of the heat recovery unit and the refrigerant outlet of the condenser are positioned higher than the refrigerant inlet of the pump.

[0013] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, the exhaust heat recovery unit, the condenser, and the evaporator are plate heat exchangers.

[0014] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, an intermediate heat exchanger is provided which further cools the heat source hot water cooled by the heat recovery unit and supplies the cooled heat source hot water to the evaporator to produce chilled water.

[0015] Furthermore, the present invention is characterized in that, in the ejector cooling device described above, a receiver tank for storing the refrigerant cooled by the condenser is provided between the condenser and the pump, and the receiver tank is positioned higher than the pump.

[0016] According to the present invention, it is possible to suppress deterioration of ejector performance while maintaining the compactness of the device.

[0017] Figure 1 is a schematic diagram showing the configuration of an ejector cooling device according to Embodiment 1 of the present invention. Figure 2 is a perspective view showing the configuration of the ejector cooling device. Figure 3 is a left side view of the ejector cooling device as seen from the control unit side. Figure 4 is a right side view of the ejector cooling device as seen from the control unit side. Figure 5 is a schematic diagram showing the configuration of an ejector cooling device according to Embodiment 2 of the present invention. Figure 6 is a front view showing the configuration of the ejector cooling device. Figure 7 is a plan view of the ejector cooling device.

[0018] Hereinafter, embodiments for carrying out this invention will be described with reference to the attached drawings.

[0019] <Embodiment 1> Figure 1 is a schematic diagram showing the configuration of an ejector cooling device according to Embodiment 1 of the present invention. Figure 2 is a perspective view showing the configuration of the ejector cooling device. Furthermore, Figure 3 is a left side view of the ejector cooling device as seen from the control unit side. Furthermore, Figure 4 is a right side view of the ejector cooling device as seen from the control unit side. The ejector cooling device 1 illustrated here recovers waste heat from waste hot water (heat source hot water) such as factory wastewater or used cooling water as a heat source, and cools the heat-recovered heat source hot water as the water to be cooled to produce chilled water.

[0020] As shown in Figures 1 to 4, the ejector cooling system 1 has an ejector 10, a condenser 11, a receiver tank 12, a pump 13, and a heat recovery unit 14 connected sequentially on the circulation path LA. The ejector cooling system 1 is also provided with a branch path LB. The branch path LB branches off from the portion upstream of the pump 13 at the branching point LS between the condenser 11 (receiver tank 12) and the heat recovery unit 14 of the circulation path LA, and supplies a portion of the refrigerant flowing through the circulation path LA to the ejector 10 as a suction flow.

[0021] Pump 13 circulates and supplies refrigerant in the circulation path LA. More specifically, pump 13 is, for example, a liquid-phase variable displacement pump that pressurizes the refrigerant and supplies it to the ejector 10. The waste heat recovery unit 14 performs heat exchange by heating the refrigerant flowing in from the refrigerant inlet 14a with waste hot water supplied from the waste hot water inlet 14c, and supplies the refrigerant supplied from pump 13 as an evaporated drive flow to the ejector 10 from the refrigerant outlet 14b.

[0022] The ejector 10 receives the drive flow from the heat recovery unit 14 through the drive inlet 10a, draws in the refrigerant evaporated by the evaporator 16 as a suction flow at the suction inlet 10b, and discharges the refrigerant, which is a mixture of the drive flow and the suction flow, from the discharge outlet 10c to the condenser 11.

[0023] The condenser 11 receives the refrigerant discharged from the ejector 10 through the refrigerant inlet 11a, and condenses the refrigerant by exchanging heat with the heat dissipation water supplied from the outside at the heat dissipation water inlet 11c. The heat dissipation water supplied from the outside is heated by heat exchange with the refrigerant in the condenser 11, and then sent from the heat dissipation water outlet 11d to a cooling device (e.g., a cooling tower) installed outside the device. After being cooled by the cooling device, it is sent back to the condenser 11 as heat dissipation water. The refrigerant condensed in the condenser 11 is stored in the downstream receiver tank 12 from the refrigerant outlet 11b, and the stored refrigerant is then sucked up by the pump 13 and supplied to the branch path LB side.

[0024] The branch path LB is equipped with an expansion valve 15 and an evaporator 16. The expansion valve 15 expands and depressurizes the refrigerant that has passed through the condenser 11 and been supplied via the branch point LS. The evaporator 16 passes through the expansion valve 15 and performs heat exchange between the liquid phase refrigerant flowing in from the refrigerant inlet 16a and the water to be cooled supplied to the evaporator 6 from the water to be cooled inlet 16c, thereby evaporating the refrigerant. The refrigerant flows out from the refrigerant outlet 16b as a suction flow to the ejector 10 and to the suction inlet 10b, while also generating chilled water by cooling the supplied water to be cooled and flowing out from the chilled water outlet 16d.

[0025] The intermediate heat exchanger 17 is cooled by the waste heat recovery unit 14, and heat exchange takes place between the waste hot water flowing from the waste hot water outlet 14d to the water to be cooled inlet 17a and the cooling water supplied from the outside via the cooling water inlet 17c, further cooling the waste hot water. The cooled waste hot water is then supplied to the evaporator 6 as the water to be cooled from the water to be cooled outlet 17b. The cooling water supplied to the intermediate heat exchanger 7 from the outside is discharged from the cooling water outlet 17d as heated water. Therefore, the waste hot water is sequentially cooled by the waste heat recovery unit 14 and the intermediate heat exchanger 17, and finally becomes chilled water cooled by the evaporator 16.

[0026] Furthermore, the condenser 11, waste heat recovery unit 14, evaporator 16, and intermediate heat exchanger 17 are plate heat exchangers. Plate heat exchangers have high heat transfer performance, are compact, and have self-cleaning capabilities by stacking heat transfer plates, which are thin sheets with complex pressed shapes, in the heat transfer section. In the case of plate heat exchangers, when the fluid is a liquid, it is necessary to ensure that it flows from the lower inlet to the upper outlet in order to make effective use of the heat transfer area.

[0027] In this embodiment 1, the refrigerant outlet 14b of the heat recovery unit 14, the drive inlet 10a of the ejector 10, the discharge outlet 10c of the ejector 10, and the refrigerant inlet 11a of the condenser 11 are arranged horizontally. Furthermore, the drive flow piping L1 connecting the refrigerant outlet 14b of the heat recovery unit 14 and the drive inlet 10a of the ejector 10, and the discharge flow piping connecting the discharge outlet 10c of the ejector 10 and the refrigerant inlet 11a of the condenser 11 are arranged linearly. In addition, the drive flow piping L1 provides the shortest possible connection between the refrigerant outlet 14b of the heat recovery unit 14 and the drive inlet 10a of the ejector 10, and the discharge flow piping L2 provides the shortest possible connection between the discharge outlet 10c of the ejector 10 and the refrigerant inlet 11a of the condenser 11.

[0028] As a result, even if the heat recovery unit 14 and condenser 11 are positioned vertically due to the refrigerant heat exchange process, no bends occur in the drive flow piping L1 and discharge flow piping L2, and the piping length is shortened, so pressure loss is suppressed, deterioration of ejector performance can be prevented, and the device can be made more compact.

[0029] Furthermore, the refrigerant inlet 14a of the heat recovery unit 14 and the refrigerant outlet 11b (receiver tank 12) of the condenser 11 are positioned higher than the refrigerant intake port of the pump 13. This prevents cavitation of the pump 13 and allows refrigerant to flow in from the lower inlet (refrigerant inlet 14a) of the heat recovery unit 14, which is a plate-type heat exchanger, thus enabling effective utilization of the heat transfer area of ​​the liquid refrigerant.

[0030] As shown in Figures 2 to 4, the pump 13 is positioned on the bottom plate 20 of the device housing 1a of the ejector cooling device 1. The intermediate heat exchanger 17 is positioned on the support frame 30. Furthermore, the condenser 11, waste heat recovery unit 14, and evaporator 16 are positioned on the support shelf 31. The control unit C is equipped with an operation display unit that allows for external operation input and display, and controls each part of the device.

[0031] <Embodiment 2> Figure 5 is a schematic diagram showing the configuration of an ejector cooling device according to Embodiment 2 of the present invention. Figure 6 is a front view showing the configuration of the ejector cooling device, and Figure 7 is a plan view of the ejector cooling device. Components identical to those of the ejector cooling device 1 of Embodiment 1 described above will be denoted by the same reference numerals. In Figures 6 and 7, the X direction is the depth direction, the Y direction is the width direction, and the Z direction is the height direction.

[0032] The ejector cooling system 2 illustrated here recovers waste heat from waste hot water (heat source hot water) such as factory wastewater or used cooling water, and generates chilled water by cooling the recovered heat source hot water as the water to be cooled.

[0033] As shown in Figures 5 to 7, the ejector cooling system 2 has an ejector 10, a condenser 11, a receiver tank 12, a pump 13, and a heat recovery unit 14 connected sequentially on the circulation path LA. The ejector cooling system 2 is also provided with a branch path LB. The branch path LB branches off from the portion upstream of the pump 13 at the branching point LS between the condenser 11 (receiver tank 12) and the heat recovery unit 14 of the circulation path LA, and supplies a portion of the refrigerant flowing through the circulation path LA to the ejector 10 as a suction flow.

[0034] Pump 13 circulates and supplies the refrigerant in the circulation path LA. More specifically, pump 13 is, for example, a liquid-phase variable displacement pump that pressurizes the refrigerant and supplies it to the ejector 10. Such a pump 13 is located on the bottom plate 21 of the device housing of the ejector cooling device 2.

[0035] The heat recovery unit 14 performs heat exchange by heating the refrigerant flowing in from the refrigerant inlet 14a with the waste hot water supplied from the waste hot water inlet 14c, and supplies the refrigerant supplied from the pump 13 as an evaporated drive flow to the ejector 10 from the refrigerant outlet 14b.

[0036] Such a heat recovery unit 14 is mounted on a support shelf 32, with the refrigerant inlet 14a and refrigerant outlet 14b facing one side in the depth direction and the front side where the ejector 10 is installed.

[0037] The ejector 10 receives the drive flow from the heat recovery unit 14 through the drive inlet 10a, draws in the refrigerant evaporated by the evaporator 16 as a suction flow through the suction inlet 10b, and discharges the refrigerant, which is a mixture of the drive flow and the suction flow, to the condenser 11 through the discharge outlet 10c. Although not explicitly shown in the figure, the ejector 10 is positioned such that the center of the drive inlet 10a and the center of the discharge outlet 10c coincide with the central axis of the ejector 10, and this central axis extends along the width direction (Y direction).

[0038] The condenser 11 receives the refrigerant discharged from the ejector 10 through the refrigerant inlet 11a, and condenses the refrigerant by exchanging heat with the heat dissipation water supplied from the outside at the heat dissipation water inlet 11c. The heat dissipation water supplied from the outside is heated by heat exchange with the refrigerant in the condenser 11, and then sent from the heat dissipation water outlet 11d to a cooling device (e.g., a cooling tower) installed outside the device. After being cooled by the cooling device, it is sent back to the condenser 11 as heat dissipation water. The refrigerant condensed in the condenser 11 is stored in the downstream receiver tank 12 from the refrigerant outlet 11b, and the stored refrigerant is then sucked up by the pump 13 and supplied to the branch path LB side.

[0039] Such a condenser 11 is mounted on a support shelf 32, and the refrigerant inlet 11a and refrigerant outlet 11b are positioned to face one side in the depth direction, that is, the front side where the ejector 10 is installed. In other words, the refrigerant inlet 11a of the condenser 11 is positioned to face the same direction as the refrigerant outlet 14b of the heat recovery unit 14.

[0040] The branch path LB is equipped with an expansion valve 15 and an evaporator 16. The expansion valve 15 expands and depressurizes the refrigerant that has passed through the condenser 11 and been supplied via the branch point LS. The evaporator 16 passes through the expansion valve 15 and performs heat exchange between the liquid phase refrigerant flowing in from the refrigerant inlet 16a and the water to be cooled supplied to the evaporator 6 from the water to be cooled inlet 16c, thereby evaporating the refrigerant. The refrigerant flows out from the refrigerant outlet 16b as a suction flow to the ejector 10 and to the suction inlet 10b, while also generating chilled water by cooling the supplied water to be cooled and flowing out from the chilled water outlet 16d.

[0041] Such an evaporator 16 is positioned below the ejector 10 between the heat recovery unit 14 and the condenser 11. The evaporator 16 is supported by a support member (not shown).

[0042] The intermediate heat exchanger 17 is cooled by the waste heat recovery unit 14, and heat exchange takes place between the waste hot water flowing from the waste hot water outlet 14d to the water to be cooled inlet 17a and the cooling water supplied from the outside via the cooling water inlet 17c, further cooling the waste hot water. The cooled waste hot water is then supplied to the evaporator 6 as the water to be cooled from the water to be cooled outlet 17b. The cooling water supplied to the intermediate heat exchanger 7 from the outside is discharged from the cooling water outlet 17d as heated water. Therefore, the waste hot water is sequentially cooled by the waste heat recovery unit 14 and the intermediate heat exchanger 17, and finally becomes chilled water cooled by the evaporator 16.

[0043] Furthermore, the condenser 11, waste heat recovery unit 14, evaporator 16, and intermediate heat exchanger 17 are plate heat exchangers. Plate heat exchangers have high heat transfer performance, are compact, and have self-cleaning capabilities by stacking heat transfer plates, which are thin sheets with complex pressed shapes, in the heat transfer section. In the case of plate heat exchangers, when the fluid is a liquid, it is necessary to ensure that it flows from the lower inlet to the upper outlet in order to make effective use of the heat transfer area.

[0044] Here, in the second embodiment, the refrigerant outlet 14b of the exhaust heat recovery device 14, the driving fluid inlet 10a of the ejector 10, the discharge fluid outlet 10c of the ejector 10, and the refrigerant inlet 11a of the condenser 11 are arranged horizontally, and more specifically, they are arranged on the same horizontal plane S.

[0045] A driving fluid pipe L3 connecting the refrigerant outlet 14b of the exhaust heat recovery device 14 and the driving fluid inlet 10a of the ejector 10, and a discharge fluid pipe L4 connecting the discharge fluid outlet 10c of the ejector 10 and the refrigerant inlet 11a of the condenser 11 are configured as follows.

[0046] The driving fluid pipe L3 includes a first driving fluid pipe component (pipe portion) L3a, a second driving fluid pipe component L3b, and a driving fluid pipe joint L3c. The first driving fluid pipe component L3a is connected to the ejector 10 in a manner such that its interior communicates with the driving fluid inlet 10a of the ejector 10 and extends along the width direction (Y direction). The second driving fluid pipe component Ls is connected to the exhaust heat recovery device 14 in a manner such that its interior communicates with the refrigerant outlet 14b of the exhaust heat recovery device 14 and extends along the depth direction (X direction). The driving fluid pipe joint L3c is a joint bent in an L shape, which is called a so-called elbow, and connects the first driving fluid pipe component L3a and the second driving fluid pipe component L3b.

[0047] The discharge fluid pipe L4 includes a first discharge fluid pipe component (pipe portion) L4a, a second discharge fluid pipe component L4b, and a discharge fluid pipe joint L4c. The first discharge fluid pipe component L4a is connected to the ejector 10 in a manner such that its interior communicates with the discharge fluid outlet 10c of the ejector 10 and extends along the width direction (Y direction). The second discharge fluid pipe component L4b is connected to the condenser 11 in a manner such that its interior communicates with the refrigerant inlet 11a of the condenser 11 and extends along the depth direction (X direction). The discharge fluid pipe joint L4c is a joint bent in an L shape, which is called a so-called elbow, and connects the first discharge fluid pipe component L4a and the second discharge fluid pipe component L4b.

[0048] Thus, in the drive flow pipe L3 and the discharge flow pipe L4, the pipe portions (the first drive flow pipe component L3a and the first discharge flow pipe component L4a) connected to the ejector 10 are arranged linearly and each is formed by curving once in the same direction midway.

[0049] Accordingly, even if there are restrictions on the vertical installation of the waste heat recovery device 14 and the condenser 11 in terms of the heat exchange process of the refrigerant, the drive flow pipe L3 and the discharge flow pipe L4 are such that the pipe portions (the first drive flow pipe component L3a and the first discharge flow pipe component L4a) connected to the ejector 10 are arranged linearly and each is formed by curving once in the same direction midway. Therefore, the pressure loss can be suppressed, the deterioration of the ejector performance can be suppressed, and the device can be made more compact.

[0050] In particular, since the drive flow pipe L3 and the discharge flow pipe L4 are each formed by curving once in the same direction midway, the waste heat recovery device 14 and the condenser 11 can be arranged on the back side (the other side) in the depth direction behind the ejector 10. Thereby, the dimension in the width direction can be reduced and the miniaturization of the entire device can be achieved.

[0051] Further, in the ejector cooling device, the refrigerant inlet 14a of the waste heat recovery device 14 and the refrigerant outlet 11b of the condenser 11 are arranged higher than the refrigerant suction port of the pump 13. Thereby, the cavitation of the pump 13 can be avoided and the refrigerant can flow in from the lower inlet (the refrigerant inlet 14a) of the waste heat recovery device 14 which is a plate type heat exchanger, so that the heat transfer area of the liquid refrigerant can be effectively utilized.

[0052] Furthermore, in the ejector cooling device, since the receiver tank 12 is arranged higher than the pump 13, the refrigerant stored in the receiver tank 12 can be reliably sent to the pump 13 using the height difference.

[0053] As described above, the preferred Embodiment 1 and Embodiment 2 of the present invention have been explained, but the present invention is not limited to these and various modifications can be made.

[0054] In the above-described embodiment 1, the drive flow piping L1 and the discharge flow piping L2 were in a straight line, but in the present invention, the drive flow piping and the discharge flow piping only need to be in a straight line in the piping portion connected to the ejector.

[0055] In the above-described embodiment 2, the drive flow pipe L3 and the discharge flow pipe L4 were curved in the middle, but in the present invention, either the drive flow pipe or the discharge flow pipe may be curved, while the other is arranged in a straight line.

[0056] It should be noted that the configurations illustrated in Embodiments 1 and 2 above are functional schematics and do not necessarily have to be physically represented as shown. In other words, the forms of distribution and integration of each device and component are not limited to those shown, and all or part of them can be functionally or physically distributed and integrated in any unit according to various usage situations.

[0057] 1,2 Ejector Cooling System 1a Device Housing 10 Ejector 10a Drive Inlet 10b Suction Inlet 10c Discharge Outlet 11 Condenser 11a, 14a, 16a Refrigerant Inlet 11b, 14b, 16b Refrigerant Outlet 11c Heat Dissipation Water Inlet 11d Heat Dissipation Water Outlet 12 Receiver Tank 13 Pump 14 Exhaust Heat Recovery Unit 14c Exhaust Hot Water Inlet 14d Exhaust Hot Water Outlet 15 Expansion Valve 16 Evaporator 16c, 17a Water to be Cooled Inlet 16d Chilled Water Outlet 17 Intermediate Heat Exchanger 17b Water to be Cooled Outlet 17c Cooling Water Inlet 17d Cooling Water Outlet 20, 21 Bottom Plate 30 Stand 31, 32 Support Shelf C Control Unit L1, L3 Drive Flow Piping L2, L4 Discharge flow piping LA Circulation route LB Branch route

Claims

1. An ejector cooling device comprising: a pump for pressurizing a refrigerant; a heat recovery unit for heating the refrigerant with a heat source of hot water to generate a drive flow; an expansion valve for reducing the pressure of the refrigerant; an evaporator for cooling a medium to be cooled with the refrigerant reduced in pressure by the expansion valve; an ejector for drawing in the refrigerant evaporated by the evaporator as a suction flow using the drive flow of the refrigerant from the heat recovery unit, and discharging a mixture of the drive flow and the suction flow; and a condenser for cooling the refrigerant discharged from the ejector, wherein the refrigerant outlet of the heat recovery unit, the drive inlet of the ejector, the discharge outlet of the ejector, and the refrigerant inlet of the condenser are arranged horizontally, and the drive flow piping connecting the refrigerant outlet of the heat recovery unit and the drive inlet of the ejector, and the discharge flow piping connecting the discharge outlet of the ejector and the refrigerant inlet of the condenser, are arranged linearly in at least the portion of the piping connected to the ejector.

2. The ejector cooling device according to claim 1, characterized in that the drive flow piping and the discharge flow piping are arranged in a straight line.

3. The ejector cooling device according to claim 2, characterized in that the drive flow piping provides the shortest possible connection between the refrigerant outlet of the heat recovery unit and the drive flow inlet of the ejector, and the discharge flow piping provides the shortest possible connection between the discharge outlet of the ejector and the refrigerant inlet of the condenser.

4. The ejector cooling device according to claim 1, characterized in that at least one of the drive flow piping and the discharge flow piping is curved in the middle.

5. The ejector cooling device according to claim 4, characterized in that the drive flow piping and the discharge flow piping are each formed to curve in the same direction midway through their operation.

6. The ejector cooling device according to any one of claims 1 to 5, characterized in that the refrigerant inlet of the heat recovery unit and the refrigerant outlet of the condenser are positioned higher than the refrigerant suction port of the pump.

7. The ejector cooling device according to claim 6, characterized in that the exhaust heat recovery unit, the condenser, and the evaporator are plate heat exchangers.

8. An ejector cooling device according to any one of claims 1 to 5, characterized in that an intermediate heat exchanger is provided to further cool the heat source hot water cooled by the heat recovery unit and to supply the cooled heat source hot water to the evaporator to produce chilled water.

9. The ejector cooling device according to claim 4 or 5, wherein a receiver tank for storing the refrigerant cooled by the condenser is provided between the condenser and the pump, and the receiver tank is positioned higher than the pump.

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