Refrigeration equipment

Abstract

To provide a refrigerating device capable of switching operation between an operation for supplying hot water and an operation not supplying hot water according to demand of hot water supply, while performing a cooling operation of the refrigerating device.SOLUTION: There is provided a refrigerating device for cooling a refrigerant by performing heat exchange between the refrigerant and water. A connection is made by means of refrigerant piping among a low-stage compression mechanism, an intercooler for cooling the refrigerant discharged from the low-stage compression mechanism, a high-stage compression mechanism for sucking the refrigerant having passed through the intercooler, and a gas cooler for cooling the refrigerant discharged from the high-stage compression mechanism. Further, a connection is made by means of water piping among water supply means, the intercooler, the gas cooler, an external heat radiation device, hot water supply means, and a water-feeding mechanism. A first flow rate adjustment mechanism is provided for adjusting a flow rate of water flowing into the hot water supply means and the external heat radiation device after passing through the gas cooler.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a refrigeration device connected to a refrigerator or freezer showcase, and more particularly to a refrigeration device capable of supplying hot water using exhaust heat from the refrigeration device. [Background technology]

[0002] Patent Document 1 discloses a refrigeration system that uses water heated by waste heat from the refrigeration system to supply hot water. This refrigeration system includes an intercooler that cools the refrigerant discharged from a low-stage compression mechanism and a gas cooler that cools the refrigerant discharged from a high-stage compression mechanism, and the intercooler and gas cooler are connected in parallel by water piping, and the water heated by the intercooler and gas cooler is used to supply hot water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4947197 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a refrigeration device that can switch between an operation that supplies hot water and an operation that does not supply hot water in response to demand for hot water while performing a cooling operation of the refrigeration device. [Means for solving the problem]

[0005] The refrigeration device according to the present disclosure is a refrigeration device that cools a refrigerant by heat exchange between the refrigerant and water, and includes a low-stage compression mechanism, an intercooler that cools the refrigerant discharged from the low-stage compression mechanism, a high-stage compression mechanism that sucks in the refrigerant that has passed through the intercooler, and a gas cooler that cools the refrigerant discharged from the high-stage compression mechanism, all connected by refrigerant piping; a water supply means, the intercooler, the gas cooler, an external heat dissipation device, a hot water supply means, and a water conveying mechanism, all connected by water piping; and a first flow rate adjustment mechanism that adjusts the flow rate of water that flows into the hot water supply means and the external heat dissipation device after passing through the gas cooler. and a control unit that controls the refrigeration device. Preparation the water piping comprises a first water piping connecting the water supply means and the gas cooler, a second water piping connecting the gas cooler and the hot water supply means, a third water piping branching from the first water piping and connecting to the intercooler, a fourth water piping connecting the intercooler and the external heat radiating device, a fifth water piping connecting the external heat radiating device and the water supply means, and a sixth water piping branching from the second water piping and joining the fourth water piping; the water piping comprises a second flow rate adjustment mechanism that adjusts the flow rate of water that flows into the gas cooler and the intercooler after passing through the first water piping, an auxiliary gas cooler that is provided between the second flow rate adjustment mechanism and the gas cooler and that cools the refrigerant after passing through the gas cooler, and an auxiliary gas cooler outlet refrigerant temperature sensor that detects the temperature of the refrigerant that has passed through the auxiliary gas cooler; and the control unit controls the second flow rate adjustment mechanism based on values ​​detected by the inlet water temperature sensor and the auxiliary gas cooler outlet refrigerant temperature sensor. do. [Effects of the Invention]

[0006] The refrigeration device of the present disclosure uses the first flow rate adjustment mechanism to direct water heated by the gas cooler to the hot water supply means when hot water is required, or to the external heat dissipation device when hot water is not required. This makes it possible to switch between an operation that supplies hot water and an operation that does not supply hot water, and allows the refrigeration device to continue cooling operation regardless of the demand for hot water. [Brief explanation of the drawings]

[0007] [Figure 1] Schematic configuration diagram of a refrigeration device according to a first embodiment [Figure 2] Block diagram of control configuration in embodiment 1 [Figure 3] Flowchart of antifreeze control in the first embodiment [Figure 4] Flowchart of intercooler water flow rate control in the first embodiment [Figure 5] Flowchart of auxiliary gas cooler water flow rate control in embodiment 1 [Figure 6] Flowchart of hot water supply temperature control in embodiment 1 DETAILED DESCRIPTION OF THE INVENTION

[0008] (Findings that formed the basis of this disclosure) A refrigeration system that uses the waste heat from a refrigeration system to supply hot water is different from a general heat pump water heater in that the refrigeration system must continue to operate continuously regardless of the demand for hot water. The inventors devised a system for providing an external heat dissipation device, which dissipates heat from water heated by the exhaust heat of the refrigeration unit when hot water supply is not required, and circulates the water to continue cooling the refrigeration unit. However, when hot water supply is required, water accumulates in the external heat dissipation device, and when the ambient temperature drops below freezing, the water in the external heat dissipation device freezes. The present invention was conceived to solve this problem.

[0009] The present disclosure provides a refrigeration device that can switch between an operation that supplies hot water and an operation that does not supply hot water depending on the demand for hot water while continuing the cooling operation of the refrigeration device, and that can prevent water from freezing.

[0010] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted.

[0011] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0012] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0013] [1-1.Configuration] In FIG. 1, the refrigeration device 100 includes a compressor 180 having a low-stage compression mechanism 110 and a high-stage compression mechanism 111, an intercooler 120 that cools the refrigerant discharged from the low-stage compression mechanism 110, a gas cooler 130 that cools the refrigerant discharged from the high-stage compression mechanism 111, and an auxiliary gas cooler 131 that further cools the refrigerant discharged from the gas cooler 130.

[0014] Furthermore, the refrigeration device 100 is connected to a cooling device 170 that is cooled by the refrigerant sent out from the refrigeration device 100 .

[0015] Here, the cooling device 170 is configured by connecting an evaporator 171 and an expansion mechanism 172, and is, for example, a showcase installed in a store such as a convenience store or supermarket, which displays refrigerated or frozen products while cooling them.

[0016] The low-stage compression mechanism 110 also includes a low-stage suction port 181 and a low-stage discharge port 182 .

[0017] Furthermore, the high-stage compression mechanism 111 includes a high-stage suction port 183 and a high-stage discharge port 184 .

[0018] The devices that make up the refrigeration device 100 and the devices that make up the cooling device 170 are connected by refrigerant piping 135 through which the refrigerant flows.

[0019] The refrigerant piping 135 is composed of a low-pressure suction piping 190 connecting the evaporator 171 and the low-stage suction port 181, an intermediate-pressure discharge piping 192 connecting the low-stage discharge port 182 and the intercooler 120, an intermediate-pressure suction piping 191 connecting the intercooler 120 and the high-stage suction port 183, a high-pressure discharge piping 193 connecting the high-stage discharge port 184 and the gas cooler 130, a high-pressure connection piping 194 connecting the gas cooler 130 and the auxiliary gas cooler 131, and an outlet piping 195 connecting the auxiliary gas cooler 131 and the expansion mechanism 172.

[0020] The refrigeration device 100 of this embodiment uses carbon dioxide as the refrigerant, the refrigerant pressure of which on the high-pressure side is equal to or higher than the critical pressure (supercritical). This carbon dioxide refrigerant is a natural refrigerant that has a small environmental impact and is non-flammable and non-toxic.

[0021] Next, the refrigeration device 100 of this embodiment is water-cooled and includes a water supply tank as water supply means 140, a hot water storage tank as hot water supply means 150, and an air-cooled sealed cooling tower as external heat dissipation device 160, and these devices are connected to the intercooler 120, gas cooler 130, and auxiliary gas cooler 131 of the refrigeration device 100 by water piping 200 through which water flows.

[0022] The water piping 200 is composed of a first water piping 201 that connects the water supply means 140 and the gas cooler 130 via the auxiliary gas cooler 131, a second water piping 202 that connects the gas cooler 130 and the hot water supply means 150, a third water piping 203 that branches off from the first water piping 201 and connects to the intercooler 120, a fourth water piping 204 that connects the intercooler 120 and the external heat dissipation device 160, a fifth water piping 205 that connects the external heat dissipation device 160 and the water supply means 140, a sixth water piping 206 that branches off from the second water piping 202 and merges with the fourth water piping 204, and a seventh water piping 207 that branches off between the auxiliary gas cooler 131 and the gas cooler 130 and merges with the fourth water piping 204.

[0023] Here, the intercooler 120 and the auxiliary gas cooler 131 are connected in parallel by the first water piping 201 and the third water piping 203. Furthermore, the auxiliary gas cooler 131 and the gas cooler 130 are connected in series by the first water piping 201.

[0024] The first water pipe 201 is provided with a water pump as a water supply mechanism 210 .

[0025] The fourth water pipe 204 is provided with a plug heater as an anti-freeze heater 220 .

[0026] A first flow rate adjustment mechanism 230 is provided at the branching point where the second water pipe 202 branches off to the sixth water pipe 206 .

[0027] A second flow rate adjustment mechanism 231 is provided at the branching point of the first water pipe 201 where it branches off to the third water pipe 203 .

[0028] A third flow rate adjustment mechanism 232 is provided at the branching point of the first water pipe 201 where it branches off to the seventh water pipe 207 .

[0029] In this embodiment, the first flow rate adjustment mechanism 230, the second flow rate adjustment mechanism 231, and the third flow rate adjustment mechanism 232 are three-way flow rate adjustment valves.

[0030] An inlet water temperature sensor 240 for detecting the temperature of water flowing into the intercooler 120 and the auxiliary gas cooler 131 is provided on the surface of the first water pipe 201 .

[0031] An intercooler outlet refrigerant temperature sensor 241 that detects the temperature of the refrigerant that has passed through the intercooler 120 is provided on the surface of the intermediate pressure suction pipe 191 .

[0032] An auxiliary gas cooler outlet refrigerant temperature sensor 242 that detects the temperature of the refrigerant that has passed through the auxiliary gas cooler 131 is provided on the surface of the outlet piping 195 .

[0033] An external heat radiator outlet water temperature sensor 243 for detecting the temperature of water that has passed through the external heat radiator 160 is provided on the surface of the fifth water pipe 205 .

[0034] A hot water supply temperature sensor 244 is provided on the surface of the second water pipe 202 to detect the temperature of the hot water to be supplied.

[0035] The refrigeration device 100 also includes a control unit 250 (not shown) that controls each unit in an integrated manner.

[0036] As shown in Figure 2, the control unit 250 performs drive control of the compressor 180, hot water supply operation switching according to hot water demand, anti-freeze control based on the detected value by the external heat dissipation device outlet water temperature sensor 243, intercooler water flow rate control based on the detected values ​​by the inlet water temperature sensor 240 and the intercooler outlet refrigerant temperature sensor 241, auxiliary gas cooler water flow rate control based on the detected values ​​by the inlet water temperature sensor 240 and the auxiliary gas cooler outlet refrigerant temperature sensor 242, and hot water temperature control based on the detected value by the hot water temperature sensor 244.

[0037] [1-2. Operation] The operation and function of the refrigeration system 100 configured as above will be described below.

[0038] First, the operation of the refrigerant will be described.

[0039] By operating the compressor 180 , the refrigerant returned from the evaporator 171 is sucked into the low-stage compression mechanism 110 through the low-stage suction port 181 .

[0040] The refrigerant sucked into the low-stage compression mechanism 110 is compressed to an intermediate pressure and discharged from the low-stage discharge port 182 .

[0041] The refrigerant discharged from the low-stage discharge port 182 flows into the intercooler 120 via the intermediate-pressure discharge pipe 192 .

[0042] The refrigerant that has flowed into intercooler 120 is cooled by heat exchange with water, and is then sucked into high-stage compression mechanism 111 via intermediate-pressure suction pipe 191 and high-stage suction port 183 in this order.

[0043] The refrigerant sucked into the high-stage compression mechanism 111 is compressed to a high pressure and discharged from the high-stage discharge port 184 .

[0044] The refrigerant discharged from the high-stage discharge port 183 flows into the gas cooler 130 via the high-pressure discharge pipe 193.

[0045] The refrigerant that has flowed into the gas cooler 130 is cooled by heat exchange with water, and then flows into the auxiliary gas cooler 131 via the high-pressure connection pipe 194. Then, in the auxiliary gas cooler 131, the refrigerant is further cooled by heat exchange with water.

[0046] The cooled refrigerant is sent to the evaporator 171 via the expansion mechanism 172, where it is heated by heat exchange with the air in the showcase, for example, and is again sucked into the low-stage compression mechanism 110. Then, while the compressor 110 is operating, these operations of the refrigerant are repeated.

[0047] Next, the operation of water will be described.

[0048] By operating the water supply mechanism 210, water is supplied from the water supply means 140, and the first water distribution The water flows into the second flow rate adjustment mechanism 231 via the pipe 201 and the water supply mechanism 210 in this order.

[0049] The water that flows into the second flow control mechanism 231 is distributed by the second flow control mechanism 231 with its flow rate adjusted to a flow path that flows into the auxiliary gas cooler 131 via the first water piping 201 and a flow path that flows into the intercooler 120 via the third water piping 203.

[0050] The water that has flowed into the auxiliary gas cooler 131 is heated by heat exchange with the refrigerant, and then flows into the third flow rate adjustment mechanism 232. The water that has flowed into the third flow rate adjustment mechanism 232 is then distributed by the third flow rate adjustment mechanism 232 to a flow path that flows into the gas cooler 130 via the first water piping 201 and a flow path that passes through the seventh water piping 207, with the flow rate further adjusted.

[0051] The water that flows into gas cooler 130 exchanges heat with the refrigerant and is further heated, and then flows into first flow rate adjustment mechanism 230 via second water piping 202. The water that flows into first flow rate adjustment mechanism 230 is then distributed, with its flow rate further adjusted, to a flow path that flows into hot water supply means 150 via second water piping 202 and a flow path that passes through sixth water piping 206.

[0052] The water that has flowed into the intercooler 120 is heated by heat exchange with the refrigerant, and then flows into the fourth water pipe 204.

[0053] The water that has passed through the seventh water pipe 207 and the sixth water pipe 206 joins with the water that has passed through the fourth water pipe 204 and flows into the external heat dissipation device 160 .

[0054] The water that flows into the external heat dissipation device 160 is cooled, for example, by heat exchange with outdoor air, and then flows into the water supply means 140. Then, while the water conveying mechanism 210 is operating, these operations of the water are repeated.

[0055] Next, the anti-freeze control will be described with reference to FIG.

[0056] The anti-freeze control starts operation by a control signal input by turning on a start switch (not shown) of the refrigeration device 100.

[0057] First, the control unit 250 sets a freezing danger temperature T0 (ST1). The freezing danger temperature T0 is usually set at about 3 to 5° C., which is a margin above the freezing point.

[0058] Thereafter, the control unit 250 acquires the external heat radiating device outlet water temperature Tout using the external heat radiating device outlet water temperature sensor 243 (ST2).

[0059] Next, the control unit 250 determines whether the external heat dissipation device outlet water temperature Tout is lower than the freezing danger temperature T0 (ST3).

[0060] If it is determined that the external heat dissipation device outlet water temperature Tout is lower than the freezing danger temperature T0 (ST3: YES), the control unit 250 determines whether the output of the water supply mechanism 210 is at maximum (ST4).

[0061] If it is determined that the output of water supply mechanism 210 is at its maximum (ST4: YES), control unit 250 determines whether the hot water supply means 150 side of first flow rate adjustment mechanism 230 is fully closed (ST5).

[0062] If it is determined that the hot water supply means 150 side of the first flow rate adjustment mechanism 230 is fully closed (ST5: YES), the control unit 250 controls the antifreeze heater 220 to increase its output. After that, while the control signal is being input (ST7: YES), steps ST2 to ST7 are repeated.

[0063] If it is determined that the hot water supply means 150 side of first flow rate adjustment mechanism 230 is not fully closed (ST5: NO), control unit 250 controls first flow rate adjustment mechanism 230 to reduce the flow rate on the hot water supply means 150 side (ST8). Thereafter, ST2 to ST7 are repeated while the control signal is being input (ST7: YES).

[0064] If it is determined that the output of the water supply mechanism 210 is not at its maximum (ST4: NO), the control unit 250 controls the water supply mechanism 210 to increase the water flow rate (ST9). Thereafter, ST2 to ST7 are repeated while the control signal is being input (ST7: YES).

[0065] When it is determined that the external heat dissipation device outlet water temperature Tout is higher than the freezing danger temperature T0 (ST3: NO), the control unit 250 determines whether or not the antifreeze heater 220 is outputting (ST10).

[0066] If it is determined that the antifreeze heater 220 is outputting (ST10: YES), the control unit 250 controls the antifreeze heater 220 to reduce its output (ST11). Thereafter, while the control signal is being input (ST7: YES), steps ST2 to ST7 are repeated.

[0067] If it is determined that there is no output from the antifreeze heater 220 (ST10: NO), While the control signal is being input (ST7: YES), ST2 to ST7 are repeated.

[0068] Then, when the start switch (not shown) of the refrigeration device 100 is turned off and the input of the control signal is stopped (ST7: NO), the anti-freeze control is ended.

[0069] Next, the intercooler water flow rate control will be described with reference to FIG.

[0070] The intercooler water flow rate control starts operation in response to a control signal input when the compression mechanism 180 is started.

[0071] First, the control unit 250 sets an upper limit value ΔTic_up and a lower limit value ΔTic_low (ST12A).

[0072] Here, the upper limit value ΔTic_up and the lower limit value ΔTic_low are values ​​that set how close the intercooler outlet refrigerant temperature Tic is to the inlet water temperature Tin. Typically, the upper limit value ΔTic_up is set to about 2 to 6 K, and the lower limit value ΔTic_low is set to about 0.5 to 4 K. The upper limit value ΔTic_up and the lower limit value ΔTic_low may be changed depending on the inlet water temperature Tin. For example, when the inlet water temperature Tin is 25°C or higher, the upper limit value ΔTic_up is set to 2 K and the lower limit value ΔTic_low is set to 0.5 K. When the inlet water temperature Tin is 20°C or higher but less than 25°C, the upper limit value ΔTic_up is set to 4 K and the lower limit value ΔTic_low is set to 2 K. When the inlet water temperature Tin is less than 20°C, the upper limit value ΔTic_up is set to 6 K and the lower limit value ΔTic_low is set to 4 K.

[0073] Thereafter, the control unit 250 acquires the inlet water temperature Tin from the inlet water temperature sensor 240 and the intercooler outlet refrigerant temperature Tic from the intercooler outlet refrigerant temperature sensor 241 (ST13).

[0074] Next, the control unit 250 checks whether the intercooler outlet refrigerant temperature Tic is equal to the inlet water temperature Tin. It is determined whether or not the value is lower than the value obtained by adding the lower limit value ΔTic_low (ST14).

[0075] If it is determined that the intercooler outlet refrigerant temperature Tic is lower than the value obtained by adding the lower limit value ΔTic_low to the inlet water temperature Tin (ST14: YES), the control unit 250 controls the water supply mechanism 210 to reduce the water flow rate (ST15). Thereafter, while the control signal is being input (ST16: YES), ST13 to ST16 are repeated.

[0076] If it is determined that the intercooler outlet refrigerant temperature Tic is higher than the value obtained by adding the lower limit value ΔTlow to the inlet water temperature Tin (ST14: NO), the control unit 250 determines whether the intercooler outlet refrigerant temperature Tic is higher than the value obtained by adding the upper limit value ΔTup to the inlet water temperature Tin (ST17).

[0077] If it is determined that the intercooler outlet refrigerant temperature Tic is higher than the value obtained by adding the upper limit value ΔTup to the inlet water temperature Tin (ST17: YES), the control unit 250 controls the water supply mechanism 210 to increase the water flow rate (ST18). Thereafter, while the control signal is being input (ST16: YES), ST13 to ST16 are repeated.

[0078] If it is determined that the intercooler outlet refrigerant temperature Tic is lower than the value obtained by adding the upper limit value ΔTup to the inlet water temperature Tin (ST17: NO), ST13 to ST16 are repeated while the control signal is being input (ST16: YES).

[0079] Then, when the compressor 180 stops and the input of the control signal is stopped (ST16: NO), the intercooler water flow rate control ends.

[0080] Next, the auxiliary gas cooler water flow rate control will be described with reference to FIG.

[0081] The auxiliary gas cooler water flow rate control starts operation by a control signal input when the compression mechanism 180 is started.

[0082] First, the control unit 250 sets an upper limit value ΔTgc_up and a lower limit value ΔTgc_low (ST12B).

[0083] Here, the upper limit value ΔTgc_up and the lower limit value ΔTgc_low are values ​​that set how close the auxiliary gas cooler outlet refrigerant temperature Tgc is to the inlet water temperature Tin. In this embodiment, the upper limit value ΔTgc_up and the lower limit value ΔTgc_low are set to the same value, but different values ​​may also be set.

[0084] Thereafter, the control unit 250 acquires the inlet water temperature Tin from the inlet water temperature sensor 240 and the auxiliary gas cooler outlet refrigerant temperature Tgc from the auxiliary gas cooler outlet refrigerant temperature sensor 242 (ST19).

[0085] Next, the control unit 250 determines whether the auxiliary gas cooler outlet refrigerant temperature Tgc is lower than the value obtained by adding the lower limit value ΔTgc_low to the inlet water temperature Tin (ST20).

[0086] If it is determined that the auxiliary gas cooler outlet refrigerant temperature Tgc is lower than the value obtained by adding the lower limit value ΔTgc_low to the inlet water temperature Tin (ST20: YES), the control unit 250 controls the second flow rate adjustment mechanism 231 to reduce the flow rate on the auxiliary gas cooler 131 side (ST21). Thereafter, ST19 to ST22 are repeated while the control signal is being input (ST22: YES).

[0087] If it is determined that the auxiliary gas cooler outlet refrigerant temperature Tgc is higher than the value obtained by adding the lower limit value ΔTgc_low to the inlet water temperature Tin (ST20: YES), the control unit 250 determines whether the auxiliary gas intercooler outlet refrigerant temperature Tgc is higher than the value obtained by adding the upper limit value ΔTgc_up to the inlet water temperature Tin (ST23).

[0088] If it is determined that the auxiliary gas cooler outlet refrigerant temperature Tgc is higher than the value obtained by adding the upper limit value ΔTgc_up to the inlet water temperature Tin (ST23: YES), the control unit 250 controls the second flow rate adjustment mechanism 231 to increase the flow rate on the auxiliary gas cooler 131 side (ST24). Thereafter, ST19 to ST22 are repeated while the control signal is being input (ST22: YES).

[0089] If it is determined that the auxiliary gas cooler outlet refrigerant temperature Tgc is lower than the value obtained by adding the upper limit value ΔTgc_up to the inlet water temperature Tin (ST23: NO), ST19 to ST22 are repeated while the control signal is input (ST22: YES).

[0090] Then, when the compressor 180 stops and the control signal is no longer input (ST22: NO), the auxiliary gas cooler water flow rate control ends.

[0091] Next, hot water temperature control will be described with reference to FIG.

[0092] The hot water supply temperature control starts operation by a control signal input by turning on a hot water supply switch (not shown).

[0093] First, the control unit 250 sets the hot water supply set temperature Tset and the hysteresis ΔTdiff (ST25).

[0094] Here, the hot water supply set temperature Tset is usually set to about 40 to 90° C. The hysteresis ΔTdiff is a value set to prevent the hot water supply temperature Tky from becoming unstable, and is usually set to about 1 to 5° C.

[0095] Thereafter, the control unit 250 acquires the hot water supply temperature Tky by the hot water supply temperature sensor 244 (ST26).

[0096] Subsequently, control unit 250 determines whether or not hot water supply temperature Tky is lower than the value obtained by subtracting hysteresis ΔTdiff from hot water supply set temperature Tset (ST27).

[0097] If it is determined that the hot water supply temperature Tky is lower than the value obtained by subtracting the hysteresis loop ΔTdiff from the hot water supply setting temperature Tset (ST27: YES), the control unit 250 controls the third flow rate adjustment mechanism 232 to reduce the flow rate on the gas cooler 130 side (ST28). Thereafter, ST26 to ST29 are repeated while the control signal is being input (ST29: YES).

[0098] If it is determined that the hot water supply temperature Tky is higher than the value obtained by subtracting the hysteresis ΔTdiff from the hot water supply setting temperature Tset (ST27: YES), the control unit 250 determines whether the hot water supply temperature Tky is higher than the value obtained by adding the hysteresis ΔTdiff to the hot water supply setting temperature Tset (ST30).

[0099] Then, when it is determined that the hot water supply temperature Tky is higher than the value obtained by adding the hysteresis loop ΔTdiff to the hot water supply setting temperature Tset (ST30: YES), the control unit 250 controls the third flow rate adjustment mechanism 232 to increase the flow rate on the gas cooler 130 side (ST31). While the control signal is being input (ST29: YES), ST26 to ST29 are repeated.

[0100] If it is determined that the hot water supply temperature Tky is lower than the value obtained by adding the hysteresis loop ΔTdiff to the hot water supply set temperature Tset (ST30: NO), ST26 to ST29 are repeated while the control signal is being input (ST29: YES).

[0101] Then, when the hot water supply switch (not shown) is turned off and the input of the control signal is stopped (ST29: NO), the hot water supply temperature control is ended.

[0102] [1-3. Effects, etc.] As described above, in this embodiment, the refrigeration device 100 comprises a low-stage compression mechanism 110, an intercooler 120 that cools the refrigerant discharged from the low-stage compression mechanism 110, a high-stage compression mechanism 111 that sucks in the refrigerant that has passed through the intercooler 120, and a gas cooler 130 that cools the refrigerant discharged from the high-stage compression mechanism 111, all connected by refrigerant piping 135, and a water supply means 140, the intercooler 120, the gas cooler 130, the external heat dissipation device 160, the hot water supply means 150, and the water conveying mechanism 210, all connected by water piping 200, and a first flow rate adjustment mechanism 230 that adjusts the flow rate of water that flows into the hot water supply means 150 and the external heat dissipation device 160 after passing through the gas cooler 130.

[0103] This allows the water heated by the gas cooler 130 to flow to the hot water supply means 150 when hot water supply is required, or to the external heat dissipation device 160 when hot water supply is not required. Therefore, it is possible to switch between an operation that supplies hot water and an operation that does not supply hot water, and the cooling operation of the refrigeration device 100 can be continued regardless of the demand for hot water.

[0104] As in this embodiment, the water piping 200 may include a first water piping 201 connecting the water supply means 140 and the gas cooler 130, a second water piping 202 connecting the gas cooler 130 and the hot water supply means 150, a third water piping 203 branching from the first water piping 201 and connecting to the intercooler 120, a fourth water piping 204 connecting the intercooler 120 and the external heat dissipation device 160, a fifth water piping 205 connecting the external heat dissipation device 160 and the water supply means 140, and a sixth water piping 206 branching from the second water piping 202 and joining the fourth piping 204.

[0105] This allows the water heated by the intercooler 120 to constantly flow into the external heat dissipation device 160. Therefore, at ambient temperatures below the freezing point, it is possible to ensure sensible heat transfer and a critical flow rate to prevent the external heat dissipation device 160 from freezing.

[0106] In addition, by supplying water to the intercooler 120 and the gas cooler 130 in parallel, the temperature of the refrigerant that has passed through the intercooler 120 and the temperature of the refrigerant that has passed through the gas cooler 130 can be cooled to a temperature close to that of the water flowing into the intercooler 120 and the gas cooler 130.

[0107] Furthermore, as in this embodiment, the refrigeration device 100 is equipped with a control unit 250 that controls the refrigeration device 100, and an external heat dissipation device outlet water temperature sensor 243 that is provided in the fifth water piping 205 and detects the temperature of the water that has passed through the external heat dissipation device 160, and the control unit 250 may be configured to control the water supply mechanism 210 based on the detected value by the external heat dissipation device outlet water temperature sensor 243.

[0108] As a result, if there is a risk of freezing, the water flow rate can be increased so that the temperature of the water passing through the external heat dissipation device 160 does not fall below a predetermined value. Therefore, even when the ambient temperature of the external heat dissipation device 160 is extremely low, the critical flow rate for avoiding freezing can be ensured. can be done.

[0109] Furthermore, as in this embodiment, the control unit 250 may be configured to control the first flow rate adjustment mechanism 230 based on a value detected by the external heat dissipation device outlet water temperature sensor 243.

[0110] As a result, when there is a risk of freezing, part or all of the water heated by the gas cooler 130 can be flowed to the external heat dissipation device 160 so that the temperature of the water passing through the external heat dissipation device 160 does not fall below a predetermined value. Therefore, even when freezing cannot be avoided by forced circulation using the water supply mechanism 210 alone, sensible heat transfer can be achieved to prevent the external heat dissipation device 160 from freezing.

[0111] Furthermore, as in this embodiment, the refrigeration device 100 may be provided with an anti-freeze heater 220 in the fourth water pipe 204, and the control unit 250 may be configured to control the anti-freeze heater 220 based on the detection value by the external heat dissipation device outlet water temperature sensor 243.

[0112] As a result, when there is a risk of freezing, the water flowing through the external heat dissipation device 160 can be heated so that the temperature of the water passing through the external heat dissipation device 160 does not fall below a predetermined value. Therefore, even when the cooling operation of the refrigeration device 100 is stopped and no heat is discharged, or even when the cooling operation is in progress but little heat is discharged, sensible heat transfer for avoiding freezing can be obtained.

[0113] Furthermore, as in this embodiment, the refrigeration device 100 is provided with an inlet water temperature sensor 240 provided in the first water piping 201 that detects the temperature of water flowing into the intercooler 120 and the gas cooler 130, and an intercooler outlet refrigerant temperature sensor 241 that detects the temperature of the refrigerant that has passed through the intercooler 120, and the control unit 250 may be configured to control the water supply mechanism 210 based on the detected values ​​by the inlet water temperature sensor 240 and the intercooler outlet refrigerant temperature sensor 241.

[0114] This makes it possible to adjust the temperature difference between the water temperature flowing into intercooler 120 and the refrigerant that has passed through intercooler 120. Therefore, it is possible to ensure a minimum water flow rate that does not cause an increase in the refrigerant discharged from high-stage compression mechanism 111 due to insufficient cooling of the refrigerant in intercooler 120, while suppressing an unnecessary increase in the water flow rate and an increase in the input energy of water supply mechanism 210.

[0115] Furthermore, as in this embodiment, the refrigeration device 100 is equipped with a second flow control mechanism 231 that adjusts the flow rate of water flowing into the gas cooler 130 and the intercooler 120 after passing through the first water piping 201, and is also equipped with an auxiliary gas cooler 131 that is provided between the second flow control mechanism 231 and the gas cooler 130 and cools the refrigerant after passing through the gas cooler 130, and an auxiliary gas cooler outlet refrigerant temperature sensor 242 that detects the temperature of the refrigerant that has passed through the auxiliary gas cooler 131, and the control unit 250 may be configured to control the second flow control mechanism 231 based on the detected values ​​by the inlet water temperature sensor 240 and the auxiliary gas cooler outlet refrigerant temperature sensor 242.

[0116] This makes it possible to adjust the temperature difference between the water temperature flowing into the auxiliary gas cooler 131 and the refrigerant that has passed through the auxiliary gas cooler 131. Therefore, it is possible to ensure a minimum water flow rate that does not result in a decrease in refrigeration capacity due to insufficient cooling of the refrigerant in the auxiliary gas cooler 131, while suppressing an unnecessary increase in the water flow rate and a decrease in the temperature of the water that has passed through the auxiliary gas cooler 131. By increasing the temperature of the water that has passed through the auxiliary gas cooler 131, it is possible to further increase the temperature of the hot water.

[0117] In addition, as in this embodiment, the refrigeration device 100 includes an auxiliary gas cooler 131 and a gas cooler. The system is equipped with a seventh water pipe 207 that branches between the gas cooler 130 and the auxiliary gas cooler 131 and joins the fourth water pipe 204, a third flow rate adjustment mechanism 232 that adjusts the flow rate of water that flows into the gas cooler 130 and the seventh water pipe 207 after passing through the auxiliary gas cooler 131, and a hot water temperature sensor 244 that is provided in the second water pipe 202 and detects the temperature of the hot water to be supplied, and the control unit 250 may be configured to control the third flow rate adjustment mechanism 232 based on the value detected by the hot water temperature sensor 244.

[0118] This makes it possible to adjust the flow rate of water flowing through the gas cooler 130. Therefore, the temperature of the water leaving the gas cooler 130, i.e., the temperature of the hot water supply, can be adjusted as desired. Furthermore, by reducing the flow rate of water flowing through the gas cooler 130, the temperature of the hot water supply can be increased up to the discharge refrigerant temperature of the high-stage compression mechanism 111.

[0119] Furthermore, as in this embodiment, the refrigeration device 100 may use carbon dioxide as the refrigerant.

[0120] This increases the temperature glide during the heat dissipation process on the high-pressure side, improving the heat exchange efficiency through counterflow, and therefore enabling more efficient production of high-temperature hot water.

[0121] (Other embodiments) As described above, the first embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the first embodiment above to create new embodiments.

[0122] Therefore, other embodiments will be exemplified below.

[0123] In the first embodiment, a single compressor equipped with a two-stage compression mechanism consisting of a low-stage compression mechanism 110 and a high-stage compression mechanism 111 is used as the compressor 180, but equivalent functionality can be obtained by using two compressors as a low-stage compressor and a high-stage compressor, respectively.

[0124] Furthermore, although a water supply tank has been described as an example of the water supply means 140, the water supply means 140 may be any means that supplies water to the first water piping 201, and may supply water directly from a water main or a well. Therefore, the water supply means 140 is not limited to a water supply tank.

[0125] Furthermore, although a hot water storage tank has been described as an example of the hot water supply means 150, the hot water supply means 150 may be any means that discharges water from the second water pipe 202. Therefore, the hot water supply means 150 is not limited to a hot water storage tank.

[0126] Furthermore, although an air-cooled sealed cooling tower has been described as an example of the external heat dissipation device 160, the external heat dissipation device 160 may be any means capable of cooling water heated by the exhaust heat of the refrigeration device 100. Therefore, the external heat dissipation device 160 is not limited to an air-cooled sealed cooling tower.

[0127] Furthermore, although a plug heater has been described as an example of antifreeze heater 220, antifreeze heater 220 may be any means that heats the water flowing into external heat dissipation device 160. Therefore, antifreeze heater 220 is not limited to a plug heater.

[0128] Furthermore, although a three-way flow rate adjustment valve has been described as an example of the first flow rate adjustment mechanism 230, the second flow rate adjustment mechanism 231, and the third flow rate adjustment mechanism 232, the first flow rate adjustment mechanism 230, the second flow rate adjustment mechanism 231, and the third flow rate adjustment mechanism 232 may be any means capable of branching water entering from one water pipe into two directions and adjusting the flow rate. 30, the second flow rate adjustment mechanism 231 and the third flow rate adjustment mechanism 232 are not limited to three-way flow rate adjustment valves.

[0129] Although carbon dioxide has been described as an example of the refrigerant to be used, the refrigerant to be used may be any medium for transferring heat in the refrigeration cycle, and therefore is not limited to carbon dioxide.

[0130] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0131] The present disclosure is applicable to devices that effectively utilize water heated by the exhaust heat of a refrigeration unit, specifically to hot water heaters, floor heating, hot water room heaters, heater-dryers, and the like that utilize the exhaust heat of a refrigeration unit. [Explanation of symbols]

[0132] 100 Refrigeration equipment 110 Low-stage compression mechanism 111 High-stage compression mechanism 120 Intercooler 130 Gas Cooler 131 Auxiliary gas cooler 135 Refrigerant piping 140 Water supply means 150 Hot water supply means 160 External heat dissipation device 170 Cooling equipment 171 Evaporator 172 Expansion Mechanism 180 Compressor 181 Low stage suction port 182 Low discharge port 183 High stage suction port 184 High-stage outlet 190 Low pressure suction piping 191 Intermediate pressure suction piping 192 Intermediate pressure discharge piping 193 High-pressure discharge piping 194 High-pressure connection piping 195 Outlet piping 200 Water piping 201 First water pipe 202 Second water pipe 203 Third water pipe 204 4th water pipe 205 5th Water Pipe 206 No. 6 Water Pipe 207 No. 7 Water Pipe 210 Water supply mechanism 220 Anti-freeze heater 230 1st flow rate adjustment mechanism 231 2nd flow rate adjustment mechanism 232 Third flow rate adjustment mechanism 240 Inlet water temperature sensor 241 Intercooler outlet refrigerant temperature sensor 242 Auxiliary gas cooler outlet refrigerant temperature sensor 243 External heat dissipation device outlet water temperature sensor 244 Hot water temperature sensor 250 control section

Claims

1. A refrigeration device that cools a refrigerant by heat exchange between the refrigerant and water, a low-stage compression mechanism, an intercooler that cools the refrigerant discharged from the low-stage compression mechanism, a high-stage compression mechanism that sucks the refrigerant that has passed through the intercooler, and a gas cooler that cools the refrigerant discharged from the high-stage compression mechanism are connected by refrigerant piping; the water supply means, the intercooler, the gas cooler, the external heat dissipation device, the hot water supply means, and the water conveying mechanism are connected by water piping; a first flow rate adjusting mechanism that adjusts the flow rate of water that flows into the hot water supply means and the external heat radiating device after passing through the gas cooler; and a control unit that controls the refrigeration device, The water piping is a first water pipe connecting the water supply means and the gas cooler; a second water pipe connecting the gas cooler and the hot water supply means; a third water pipe branching from the first water pipe and connected to the intercooler; a fourth water pipe connecting the intercooler and the external heat dissipation device; a fifth water pipe connecting the external heat dissipation device and the water supply means; a sixth water pipe branching from the second water pipe and joining the fourth water pipe; Equipped with a second flow rate adjusting mechanism that adjusts the flow rate of water that flows into the gas cooler and the intercooler after passing through the first water pipe; an auxiliary gas cooler provided between the second flow rate adjustment mechanism and the gas cooler, which cools the refrigerant after passing through the gas cooler; an auxiliary gas cooler outlet refrigerant temperature sensor that detects the temperature of the refrigerant that has passed through the auxiliary gas cooler; The control unit controls the second flow rate adjustment mechanism based on detected values ​​from an inlet water temperature sensor and an outlet refrigerant temperature sensor of the auxiliary gas cooler.

2. a control unit that controls the refrigeration device; an external heat radiator outlet water temperature sensor provided in the fifth water pipe and configured to detect the temperature of water that has passed through the external heat radiator; The control unit controls the water supply mechanism based on a detected value by the external heat dissipation device outlet water temperature sensor. The refrigeration system of claim 1.

3. the control unit controls the first flow rate adjustment mechanism based on a detected value by the external heat dissipation device outlet water temperature sensor.

3. The refrigeration system according to claim 2.

4. The fourth water pipe is provided with an anti-freeze heater; The control unit controls the antifreeze heater based on a detected value by the external heat dissipation device outlet water temperature sensor.

3. The refrigeration system according to claim 2.

5. an inlet water temperature sensor provided in the first water pipe for detecting the temperature of water flowing into the intercooler and the gas cooler; an intercooler outlet refrigerant temperature sensor that detects the temperature of the refrigerant that has passed through the intercooler, The control unit controls the water supply mechanism based on detected values ​​by the inlet water temperature sensor and the intercooler outlet refrigerant temperature sensor. The refrigeration device according to any one of claims 1 to 4.

6. a seventh water pipe that branches between the auxiliary gas cooler and the gas cooler and joins the fourth water pipe; a third flow rate adjustment mechanism that adjusts the flow rate of water that flows into the gas cooler and the seventh water pipe after passing through the auxiliary gas cooler; a hot water temperature sensor provided in the second water pipe to detect the temperature of the hot water to be supplied; The control unit controls the third flow rate adjustment mechanism based on a value detected by the hot water temperature sensor. The refrigeration device according to any one of claims 1 to 5.

7. Carbon dioxide is used as the refrigerant. The refrigeration device according to any one of claims 1 to 6.

8. A refrigeration device that cools a refrigerant by heat exchange between the refrigerant and water, a low-stage compression mechanism, an intercooler that cools the refrigerant discharged from the low-stage compression mechanism, a high-stage compression mechanism that sucks the refrigerant that has passed through the intercooler, and a gas cooler that cools the refrigerant discharged from the high-stage compression mechanism are connected by refrigerant piping; the water supply means, the intercooler, the gas cooler, the external heat dissipation device, the hot water supply means, and the water conveying mechanism are connected by water piping; the water piping includes a first water piping that connects the water supply means and the gas cooler, a first flow rate adjusting mechanism that adjusts the flow rate of water that flows into the hot water supply means and the external heat dissipation device after passing through the gas cooler; a control unit that controls the refrigeration device; an inlet water temperature sensor provided in the first water pipe for detecting the temperature of water flowing into the intercooler and the gas cooler; an intercooler outlet refrigerant temperature sensor that detects the temperature of the refrigerant that has passed through the intercooler, The control unit controls the water supply mechanism based on detected values ​​from the inlet water temperature sensor and the intercooler outlet refrigerant temperature sensor.

9. A refrigeration device that cools a refrigerant by heat exchange between the refrigerant and water, a low-stage compression mechanism, an intercooler that cools the refrigerant discharged from the low-stage compression mechanism, a high-stage compression mechanism that sucks the refrigerant that has passed through the intercooler, and a gas cooler that cools the refrigerant discharged from the high-stage compression mechanism are connected by refrigerant piping; the water supply means, the intercooler, the gas cooler, the external heat dissipation device, the hot water supply means, and the water conveying mechanism are connected by water piping; the water piping includes a first water piping that connects the water supply means and the gas cooler, a second water piping that connects the gas cooler and the hot water supply means, and a fourth water piping that connects the intercooler and the external heat dissipation device, a first flow rate adjusting mechanism that adjusts the flow rate of water that flows into the hot water supply means and the external heat dissipation device after passing through the gas cooler; a control unit that controls the refrigeration device; a second flow rate adjustment mechanism that adjusts the flow rate of water that flows into the gas cooler and the intercooler after passing through the first water pipe; an auxiliary gas cooler provided between the second flow rate adjustment mechanism and the gas cooler, which cools the refrigerant after passing through the gas cooler; a seventh water pipe that branches between the auxiliary gas cooler and the gas cooler and joins the fourth water pipe; a third flow rate adjustment mechanism that adjusts the flow rate of water that flows into the gas cooler and the seventh water pipe after passing through the auxiliary gas cooler; a hot water temperature sensor provided in the second water pipe to detect the temperature of the hot water to be supplied; The control unit controls the third flow rate adjustment mechanism based on a value detected by the hot water temperature sensor.

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