Ejector cooling system

Abstract

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, while 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 L2 connecting the discharge outlet 10c of the ejector 10 and the refrigerant inlet 11a of the condenser 11 are arranged linearly. Furthermore, 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.

Description

Technical Field

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

Background Art

[0002] An ejector cooling device is a cooling cycle device using an ejector. It uses hot water from a heat source 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 ejector acts to pressurize the suction flow from the evaporator. The pressurized refrigerant is sent to a 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 to achieve miniaturization of the ejector-type refrigerator.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, the ejector effect fluctuates due to pressure fluctuations before and after the ejector. Therefore, if the piping connecting the ejector to the heat exchangers before and after the ejector becomes longer, it leads to increased pressure loss and deterioration of ejector performance. Patent document 1 mentioned above states that by tilting the ejector diagonally downward, the device can be miniaturized, and the distance between the ejector and each heat exchanger can be shortened to reduce the required piping length and suppress heat loss and pressure loss. However, if the ejector is tilted, the refrigerant outlet of the heat recovery unit that generates the drive flow and the refrigerant inlet of the condenser into which the discharge flow flows are positioned vertically above and below each other. As a result, the vertical arrangement becomes larger, which can hinder the miniaturization of the device. Moreover, since each heat exchanger (heat recovery unit, condenser, evaporator) is positioned vertically, bends occur in the connecting piping to each heat exchanger. Although the piping length is shortened, pressure loss occurs.

[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. [Means for solving the problem]

[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. [Effects of the Invention]

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

Brief Description of the Drawings

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

Modes for Carrying Out the Invention

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

[0019] <Embodiment 1> FIG. 1 is a schematic diagram showing the configuration of an ejector cooling device according to Embodiment 1 of the present invention. Further, FIG. 2 is a perspective view showing the configuration of the ejector cooling device. Furthermore, FIG. 3 is a left side view of the ejector cooling device as viewed from the control unit side. Also, FIG. 4 is a right side view of the ejector cooling device as viewed from the control unit side. Note that the ejector cooling device 1 illustrated here recovers waste heat from exhaust warm water (heat source warm water) such as industrial wastewater and used cooling water as a heat source, and cools the heat-recovered heat source warm water as the cooling water to generate cold water.

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

[0021] The pump 13 circulates and supplies the refrigerant in the circulation path LA. More specifically, the pump 13 is, for example, a variable displacement pump in the liquid phase, and pressurizes the refrigerant and supplies it to the ejector 10. The exhaust heat recovery device 14 performs heat exchange to heat the refrigerant flowing in from the refrigerant inlet 14a with the exhaust warm water supplied from the exhaust warm water inlet 14c, and supplies the refrigerant evaporated from the refrigerant supplied from the pump 13 as a driving flow to the ejector 10 from the refrigerant outlet 14b.

[0022] The ejector 10 allows the driving flow from the exhaust heat recovery device 14 to flow in from the driving flow inlet 10a, sucks the refrigerant evaporated by the evaporator 16 as a suction flow at the suction flow inlet 10b, and discharges the refrigerant obtained by mixing the driving flow and the suction flow from the discharge outlet 10c to the condenser 11.

[0023] The condenser 11 allows the refrigerant discharged from the ejector 10 to flow in from the refrigerant inlet 11a, and performs heat exchange with the heat dissipation water supplied from the outside at the heat dissipation water inlet 11c to condense the refrigerant. 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 (such as a cooling tower) installed outside the device. After being cooled by the cooling device, it is sent again to the condenser 11 as heat dissipation water. The refrigerant condensed by the condenser 11 is stored in the subsequent receiver tank 12 from the refrigerant outlet 11b, and the stored refrigerant is then sucked 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 evaporates the refrigerant by exchanging heat between the liquid phase refrigerant that has passed through the expansion valve 15 and the water to be cooled supplied to the evaporator 6 from the water to be cooled inlet 16c. The refrigerant then flows out from the refrigerant outlet 16b as a suction flow to the ejector 10 at the suction inlet 10b, and also generates chilled water by cooling the supplied water to be cooled, which flows 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 heated and discharged from the cooling water outlet 17d. 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. In addition, 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. Furthermore, 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 heat exchange process of the refrigerant, 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 in 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 effectively utilizing 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 in 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 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 hot wastewater supplied from the hot wastewater 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 at 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, with the refrigerant inlet 11a and refrigerant outlet 11b positioned to face one side in the depth direction, i.e., 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 evaporates the refrigerant by exchanging heat between the liquid phase refrigerant that has passed through the expansion valve 15 and the water to be cooled supplied to the evaporator 6 from the water to be cooled inlet 16c. The refrigerant then flows out from the refrigerant outlet 16b as a suction flow to the ejector 10 at the suction inlet 10b, and also generates chilled water by cooling the supplied water to be cooled, which flows 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 heated and discharged from the cooling water outlet 17d. 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] In this embodiment 2, 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, or more specifically, on the same horizontal plane S.

[0045] The drive flow piping L3, which connects the refrigerant outlet 14b of the heat recovery unit 14 to the drive inlet 10a of the ejector 10, and the discharge flow piping L4, which connects the discharge outlet 10c of the ejector 10 to the refrigerant inlet 11a of the condenser 11, are configured as follows.

[0046] The drive flow piping L3 comprises a first drive flow piping component (piping portion) L3a, a second drive flow piping component L3b, and a drive flow piping joint L3c. The first drive flow piping component L3a is connected to the ejector 10 in such a manner that its internal structure communicates with the drive inlet 10a of the ejector 10, and extends along the width direction (Y direction). The second drive flow piping component L3b is connected to the heat recovery unit 14 in such a manner that its internal structure communicates with the refrigerant outlet 14b of the heat recovery unit 14, and extends along the depth direction (X direction). The drive flow piping joint L3c is an L-shaped joint, commonly referred to as an elbow, and connects the first drive flow piping component L3a and the second drive flow piping component L3b.

[0047] The discharge flow piping L4 comprises a first discharge flow piping component (piping portion) L4a, a second discharge flow piping component L4b, and a discharge flow piping joint L4c. The first discharge flow piping component L4a is connected to the ejector 10 in such a manner that its internal structure communicates with the discharge outlet 10c of the ejector 10, and extends along the width direction (Y direction). The second discharge flow piping component L4b is connected to the condenser 11 in such a manner that its internal structure communicates with the refrigerant inlet 11a of the condenser 11, and extends along the depth direction (X direction). The discharge flow piping joint L4c is an L-shaped joint, commonly referred to as an elbow, and connects the first discharge flow piping component L4a and the second discharge flow piping component L4b.

[0048] Thus, the drive flow pipe L3 and the discharge flow pipe L4 are formed with the pipe portions connected to the ejector 10 (first drive flow pipe component L3a and first discharge flow pipe component L4a) arranged in a straight line, and each curves once in the same direction midway through.

[0049] As a result, even though the heat recovery unit 14 and condenser 11 are restricted to being positioned vertically for refrigerant heat exchange processing, the drive flow piping L3 and discharge flow piping L4 have their connected piping sections (first drive flow piping component L3a and first discharge flow piping component L4a) arranged in a straight line and only curve once in the same direction midway through, thus suppressing pressure loss, preventing deterioration of ejector performance, and allowing the device to be made more compact.

[0050] In particular, since the drive flow piping L3 and the discharge flow piping L4 are each formed with a curve in the same direction midway through, the exhaust heat recovery unit 14 and the condenser 11 can be positioned on the rear side (the other side) in the depth direction of the ejector 10, thereby reducing the dimensions in the width direction and enabling miniaturization of the entire device.

[0051] Furthermore, in the ejector cooling system described above, the refrigerant inlet 14a of the heat recovery unit 14 and the refrigerant outlet 11b 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 effectively utilizing the heat transfer area of ​​the liquid refrigerant.

[0052] Furthermore, in the ejector cooling system described above, the receiver tank 12 is positioned higher than the pump 13, so the refrigerant stored in the receiver tank 12 can be reliably delivered to the pump 13 by utilizing the difference in height.

[0053] Although preferred embodiments 1 and 2 of the present invention have been described above, the present invention is not limited thereto and can be modified in various ways.

[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 midway, 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. [Explanation of symbols]

[0057] 1,2 Ejector cooling system 1a Device housing 10 Ejectors 10a Drive inlet 10b Suction inlet 10c Discharge outlet 11 Condenser 11a,14a,16a Refrigerant inlet 11b,14b,16b Refrigerant outlet 11c Facility water inlet 11d Facility water outlet 12 Receiver Tank 13 pumps 14. Heat recovery unit 14c Exhaust hot water inlet 14d Exhaust hot water outlet 15 Expansion valve 16 Evaporator 16c,17a Cooled water inlet 16d cold water outlet 17 Intermediate heat exchanger 17b Cooled water outlet 17c Cooling water inlet 17d Cooling water outlet 20,21 Bottom plate 30 mounting bases 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 system comprising: a pump for pressurizing a refrigerant; a heat recovery unit for heating the refrigerant with hot water as a heat source to generate a drive flow; an expansion valve for reducing the pressure of the refrigerant; an evaporator for cooling a medium 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 refrigerant from the heat recovery unit, and for 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. An ejector cooling system characterized in that 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 in a straight line, at least in the piping portions 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 pipe and the discharge flow pipe 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 inlet of the pump.

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

8. The ejector cooling device according to any one of claims 1 to 5, further comprising an intermediate heat exchanger that 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.

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

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