JP4263086B2 - Refrigeration equipment - Google Patents

Description

  The present invention relates to a refrigeration apparatus configured by connecting a heat source unit and a heat exchange unit.

Conventional refrigeration systems are equipped with a heat source unit equipped with a compressor that compresses and discharges refrigerant, and a refrigerant / water heat exchanger that exchanges heat between the refrigerant and water supplied from the heat source unit. A refrigeration apparatus configured by connecting a heat exchange unit that is generated and supplied to a use side heat exchanger is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 08-233398

  However, in the conventional refrigeration system, only the temperature on the direction of the return side and the temperature on the return side of the cold / warm water supplied from the heat exchange unit to the use side heat exchanger is detected, so the capacity is always emphasized. I could only drive. Further, since the refrigerant supplied from the heat source unit to the heat exchange unit cannot be sufficiently subcooled, the refrigerant cannot be efficiently heat exchanged.

  Accordingly, the present invention has been made to solve the above-described problems, and is a refrigeration equipped with a heat exchange unit that can improve heat exchange efficiency and can select between a performance-oriented operation and an energy-saving operation. A device is provided.

  The invention according to claim 1 is equipped with a heat source unit that mounts a compressor that compresses and discharges the refrigerant, and a heat exchanger that performs heat exchange between the refrigerant and cold / hot water supplied to the use-side heat exchanger. In the refrigeration apparatus configured by connecting to the heat exchange unit, the refrigerant that causes the heat exchange unit to exchange heat between the refrigerant supplied from the heat source unit and the cold / hot water supplied to the use-side heat exchanger. / Water heat exchanger, and a refrigerant heat exchanger for exchanging heat between the refrigerant flowing upstream of the refrigerant / water heat exchanger and the refrigerant flowing downstream, the temperature of the refrigerant flowing through the upstream side A first refrigerant temperature sensor for detecting the refrigerant and a second refrigerant temperature sensor for detecting the temperature of the refrigerant flowing through the downstream side, and selecting the temperature of the refrigerant detected by the first refrigerant temperature sensor , Upstream of refrigerant heat exchanger The temperature of the refrigerant circulating is detected by detecting the temperature of the circulating refrigerant, performing an operation that emphasizes energy saving, and selecting the temperature of the refrigerant detected by the second refrigerant temperature sensor. It is characterized in that it detects and causes driving with emphasis on ability.

  The invention according to claim 2 is the invention according to claim 1, wherein the selection of the refrigerant temperature detected by the first refrigerant temperature sensor and the refrigerant temperature detected by the second refrigerant temperature sensor is as follows. The switch is selected and operated by a switch provided in the heat exchange unit or the heat source unit, or an operation switch provided on a remote controller for instructing operation of the refrigeration apparatus. To do.

  According to the first aspect of the present invention, in addition to the refrigerant / water heat exchanger that exchanges heat between the refrigerant supplied from the heat source unit and the cold / hot water supplied to the user-side heat exchanger, the refrigerant / water Since the refrigerant heat exchanger that exchanges heat between the refrigerant flowing upstream and the refrigerant flowing downstream of the heat exchanger is provided, the refrigerant flowing into the refrigerant / water heat exchanger is sufficiently subcooled. Therefore, the heat exchange efficiency of the refrigerant can be improved, and the first refrigerant temperature sensor that detects the temperature of the refrigerant that flows through the upstream side of the refrigerant heat exchanger, and the refrigerant that flows through the downstream side And a second refrigerant temperature sensor for detecting the temperature of the refrigerant, and by detecting the temperature of the refrigerant flowing upstream of the refrigerant heat exchanger by selecting the refrigerant temperature detected by the first refrigerant temperature sensor, Let ’s do energy-saving driving By selecting the temperature of the refrigerant detected by the second refrigerant temperature sensor, the temperature of the refrigerant flowing in the downstream side of the refrigerant heat exchanger is detected to perform the performance-oriented operation. The operation can be easily switched without changing the software of the program that performs the control.

  According to the second aspect of the present invention, the selection of the refrigerant temperature detected by the first refrigerant temperature sensor and the refrigerant temperature detected by the second refrigerant temperature sensor is performed in the heat exchange unit, Alternatively, since the selection operation is performed by a switch provided in the heat source unit or an operation switch provided on a remote controller or the like for instructing operation of the refrigeration apparatus, the selection operation can be easily performed. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a system configuration including a refrigerant circuit of a refrigeration apparatus to which the present invention is applied. The refrigeration apparatus 100 is configured by connecting a heat source unit 1 and a heat exchange unit 2 with refrigerant pipes 3a and 3b.

  The heat source unit 1 performs control of the gas engine 10, the compressor 11 driven by the gas engine 10, and the gas engine 10, communication with a heat exchange side control device 24 of the heat exchange unit 2 described later, and the like. A machine room 12 containing the heat source side control device 16 and the like is provided on a base frame (not shown). Above the machine room 12, an outdoor heat exchanger 13 and air blown to the outdoor heat exchanger 13 are provided. A heat radiating chamber 15 in which the blower fans 14 and 14 to be performed are stored is provided.

  The heat exchange unit 2 includes a plurality of plate-type heat exchangers, ie, refrigerant / water heat exchangers 20a, 20b, a refrigerant heat exchanger 20c, the refrigerant / water heat exchangers 20a, 20b, and the refrigerant heat exchange. The electric expansion valve 21 for controlling the flow rate of the refrigerant flowing through the vessel 20c, the receiver tank 22 for temporarily storing the refrigerant, check valves 23a and 23b, and the electric motor based on temperature signals from various temperature sensors described later. A heat exchange side control device 24 that houses the adjustment of the opening degree of the expansion valve 21 and communication with the heat source side control device 16 of the heat source unit 1 is housed.

  The refrigerant pipe connection in the heat exchange unit 2 will be described. The refrigerant pipe 3a extending from the heat source unit 1 is connected to one end of the receiver tank 22, and the other end of the receiver tank 22 is connected to a check valve. 23a is connected to one first refrigerant inlet 53a (see FIG. 3) of the refrigerant heat exchanger 20c, and the check valve 23a is connected from the receiver tank 22 to the refrigerant heat exchanger 20c. It is provided in the direction in which the refrigerant flows. The other end of the receiver tank 22 is connected to a check valve 23b having one end connected to the first refrigerant outlet 53b (see FIG. 3) of the refrigerant heat exchanger 20c. The check valve 23 b is provided in a direction in which the refrigerant flows from the first refrigerant outlet 53 b of the refrigerant heat exchanger 20 c to the other end of the receiver tank 22. Further, the one first refrigerant outlet 53b of the refrigerant heat exchanger 20c is connected to the refrigerant inlet 34a (see FIG. 2) of the refrigerant / water heat exchanger 20a via the electric expansion valve 21. The refrigerant outlet 34b (see FIG. 2) of the water heat exchanger 20a is connected to the refrigerant inlet of the refrigerant / water heat exchanger 20b. The refrigerant outlet of the refrigerant / water heat exchanger 20b is connected to the other second refrigerant inlet 54a (see FIG. 3) of the refrigerant heat exchanger 20c, and the second refrigerant outlet 54b (see FIG. 3) of the refrigerant heat exchanger 20c. 3) is connected to a refrigerant pipe 3b extending from the heat source unit 1. That is, the refrigerant / water heat exchangers 20a and 20b are provided connected in series on the refrigerant circuit.

  Moreover, although the cold / hot water piping 4a, 4b is extended from the heat exchange unit 2 and connected to the utilization side heat exchanger 30, the cold / hot water outlet 35b of the refrigerant / water heat exchanger 20a (see FIG. 2). The hot / cold water pipe 25a extending from the refrigerant / water heat exchanger 20b is connected to the cold / hot water pipe 25b extending from the cold / hot water outlet of the refrigerant / water heat exchanger 20b. The cold / hot water pipe 26a that is connected to the cold / hot water inlet of the refrigerant / water heat exchanger 20a and that extends from the cold / hot water inlet 35a (see FIG. 2) extends from the cold / hot water inlet of the refrigerant / water heat exchanger 20b. It connects with the water piping 26b, and is connected to one cold / hot water outlet of the utilization side heat exchanger 30 as the said cold / hot water piping 4b. That is, the refrigerant / water heat exchangers 20 a and 20 b are provided in parallel on the cold / hot water circuit connected to the use-side heat exchanger 30.

  Thereby, on the refrigerant circuit side supplied from the heat source unit 1, it is possible to set a long path for heat exchange with the cold / hot water supplied from the heat exchange unit 2 to the use side heat exchanger 30. The efficiency of heat exchange with cold / hot water can be improved, and on the cold / hot water circuit side, refrigerant / water can be supplied without reducing the flow rate of cold / hot water supplied from the heat exchange unit 2 to the use-side heat exchanger 30. The flow rate of the cold / hot water in the heat exchangers 20a, 20b and in each of the cold / hot water pipes connected to the pipe can be reduced, and the corrosion of the pipes and the like by the cold / hot water can be suppressed. Moreover, even if the flow rate of the cold / hot water circulated to the refrigerant / water heat exchangers 20a, 20b is reduced, the flow rate of the cold / hot water supplied from the heat exchange unit 2 to the use-side heat exchanger 30 can be secured. The diameter of each of the cold / hot water pipes 25a, 25b, 26a, and 26b can be reduced and the pipes can be formed using copper pipes, so that the piping process is facilitated and the manufacturing cost can be kept low. .

  The refrigerant pipe near the refrigerant inlet 34a of the refrigerant / water heat exchanger 20a is provided with a refrigerant inlet sensor T1 (first refrigerant temperature sensor), near the second refrigerant outlet 54b of the refrigerant / water heat exchanger 20c. The refrigerant pipe 3b is provided with a refrigerant outlet sensor T2 (second refrigerant temperature sensor), and the cold / hot water pipes 25a and 25b respectively extending from the refrigerant / water heat exchangers 20a and 20b are joined at the cold / hot water. A cold / hot water inlet sensor t1 is provided at a position where the outlet sensor t2 joins the cold / hot water pipes 26a and 26b, and each refrigerant / water heat exchanger 20a, to which the cold / hot water pipes 25a, 25b are connected, Freezing prevention sensors t3 and t4 are respectively provided at the cold / hot water outlet of 20b, and the temperature signals detected by these temperature sensors are detected by the heat exchange side control device 24. Going on.

  Here, the refrigerant / water heat exchanger 20a and the freeze prevention sensor t3 will be described.

  As shown in the development view of FIG. 2, the refrigerant / water heat exchanger 20a has a structure in which a number of partition plates 31c are provided between the tube plates 31a and 31b, and the refrigerant layer 32 through which the refrigerant flows. And the cold / hot water layer 33 through which the cold / hot water flows are stacked alternately.

  For example, a refrigerant inlet 34a and a cold / hot water outlet 35b are provided above the tube plate 31a, and a refrigerant outlet 34b and a cold / hot water inlet 35a are provided below the pipe plate 31a. The thus-received refrigerant flows into the refrigerant layer 32 provided every other, performs heat exchange with the cold / hot water while flowing through the refrigerant layer 32, and flows out from the refrigerant outlet 34b. Similarly, the cold / hot water flowing in from the cold / hot water inlet 35a flows into the cold / hot water layer 33 provided every other, and performs heat exchange with the refrigerant while circulating through the cold / hot water layer 33, It is cooled or heated and flows out from the cold / hot water outlet 35b.

  The refrigerant / water heat exchanger 20a is configured such that the cold / hot water layer 33 is provided on the outermost layers 36a, 36b, and the anti-freezing sensor is disposed near the cold / hot water outlet 35b on the outer surface of the tube plate 31a. t3 is provided. This is in the vicinity of the refrigerant inlet 34a into which the refrigerant supplied from the heat source unit 1 flows when the cold water is supplied from the heat exchange unit 2 to the use side heat exchanger 30, and the cold / hot water temperature near the cold / hot water outlet 35b is Since the temperature is the lowest, the temperature of the chilled water cooled by the heat exchange with the refrigerant is detected at this position, the heat exchange side control device 24 determines that the chilled water is frozen, and transmits it to the heat source side control device 16. This is because by controlling the operation of the gas engine 10 and the compressor 11, it is possible to reliably prevent the cold water from freezing. In addition, it is desirable that the freeze prevention sensor t3 is provided in the outermost layer 36a in the vicinity of the cold / hot water outlet 35b. However, from the viewpoint of difficulty in workability of the refrigerant / water heat exchanger 20a, it is provided on the outer surface of the tube plate 31a. Insulation treatment with outside air is performed with a heat insulating material or the like.

  The refrigerant / water heat exchanger 20b and the freeze prevention sensor t4 are the same as the refrigerant / water heat exchanger 20a and the freeze prevention sensor t3, and thus the description thereof is omitted.

  Further, the refrigerant heat exchanger 20c will be described. As shown in FIG. 3, the refrigerant heat exchanger 20c has the same configuration as that of the refrigerant / water heat exchangers 20a and 20b. The refrigerant heat exchanger 20c includes the tube plates 50a and 50b. Between the first refrigerant layer 51 and the refrigerant / water heat exchanger 20a, the first refrigerant layer 51 flows in the refrigerant / water heat exchanger 20a through the check valve 23a. The second refrigerant layer 52 through which the refrigerant that flows out of the water heat exchanger 20b and returns to the heat source unit 1 through the refrigerant pipe 3b flows alternately and repeatedly.

  Above the tube plate 50a, for example, a refrigerant flowing through the check valve 23a from the receiver tank 22 flows into one of the refrigerant heat exchangers 20c, a first refrigerant inlet 53a, and refrigerant / water heat. There is provided a second refrigerant outlet 54b through which heat is exchanged with cold / hot water in the exchanger 20a, the refrigerant flowing through the refrigerant pipe 3b and returning to the heat source unit 1 flows out, and below the check valve from the receiver tank 22 The first refrigerant outlet 53b from which the refrigerant flowing through 23a flows out, and the refrigerant that has flowed out from the refrigerant outlet 34b of the refrigerant / water heat exchanger 20a flow into the other of the refrigerant heat exchanger 20c. 2 refrigerant inlets 54a are provided, and the refrigerant flowing through the check valve 23a and flowing in from the first refrigerant inlets 53a flows into the other first refrigerant layer 51 provided every other refrigerant inlet 54a. Circulate through the refrigerant layer 51 Heat exchange with the refrigerant flowing out from the refrigerant outlet of the refrigerant / water heat exchanger 20b flowing through the other second refrigerant layer 52 in between is supercooled and flows out from the first refrigerant outlet 53b. ing. Similarly, the refrigerant flowing through the refrigerant / water heat exchanger 20b that has flowed in from the second refrigerant inlet 54a flows into the second refrigerant layer 52 that is provided every other refrigerant, and flows through the second refrigerant layer 52. Heat is exchanged with the refrigerant that has passed through the check valve 23a in between, and the refrigerant is overheated and flows out from the second refrigerant outlet 54b.

  Furthermore, the refrigerant and cold / hot water flowing in the refrigerant / water heat exchangers 20a and 20b flow in opposite directions when cold water is supplied from the heat exchange unit 2 to the use-side heat exchanger 30. The flow direction of the refrigerant flowing through the one in the refrigerant heat exchanger 20c and the refrigerant flowing through the other in the refrigerant heat exchanger 20c flow in opposite directions in the same manner. In the case where hot water is supplied from the heat exchange unit 2 to the use-side heat exchanger 30, the refrigerant and the hot water flow in the same direction in the refrigerant / water heat exchangers 20a and 20b. In the vessel 20c, since the refrigerant flowing through the one and the other flows in the opposite direction, the refrigerant 20c flows in the opposite direction as in the case of supplying cold water from the heat exchange unit 2 to the use side heat exchanger 30. Become.

  Next, the structure of the heat exchange unit 2 will be described. As shown in FIG. 4, the heat exchange unit 2 has a base frame 40, and L-shaped members 41 a to 41 h on the base frame 40. The housing base 42 is constructed by combining the above.

  Further, in the vicinity of the opposing edge portions 40a and 40b on the base frame 40, the hot and cold water pipes 43a and 43b constituting a part of the hot and cold water pipes 4a and 4b in FIG. Is arranged. The cold / hot water pipes 43a and 43b are straight pipes whose both ends can be opened, and the cold / hot water pipes 4a are oriented in either the edge 40c side or the 40d side depending on the installation situation. 4b can be extended.

  Further, a refrigerant / water heat exchanger 20a and a refrigerant heat exchanger 20c are provided on the edge 40c side of the base frame 40, and a refrigerant is provided on the edge 40d side facing the edge 40c. / The water heat exchanger 20b, the receiver tank 22, and the heat exchange side control device 24 are placed. In other words, the refrigerant / water heat exchangers 20a and 20b, the refrigerant heat exchanger 20c, the receiver tank 22 and the like, which are heavy objects, are arranged on the base frame 40 so as to be distributed substantially evenly.

  Further, the refrigerant inlet / outlet and the cold / hot water inlet / outlet of the refrigerant / water heat exchanger 20a and the refrigerant heat exchanger 20c are opposed to the refrigerant inlet / outlet of the refrigerant / water heat exchanger 20b. It is arranged.

  As a result, the center of gravity of the heat exchange unit 2 can be set near the center of the base frame 40, and the height of the center of gravity can be lowered, so that the heat exchange unit 2 can be transported or installed. The danger of falling over can be prevented. Moreover, in the center part in the heat exchange unit 2, the refrigerant | coolant piping in which the refrigerant | coolant supplied from the heat source unit 1 circulates, the cold / hot water piping 25a, 25b connected to the said cold / hot water piping 43a, 43b, and cold / hot water piping Since only pipes such as 26a and 26b are provided, this central portion can be used as a maintenance space for the heat exchange unit 2, and the maintainability can be improved. Further, since the heat exchange unit 2 includes the receiver tank 22, even if the refrigerant / water heat exchangers 20a, 20b are plate-type heat exchangers, the refrigerant / water heat exchangers 20a, 20b are circulated. The refrigerant capacity can be secured and, for example, in the case of a failure of the heat source unit 1, the refrigerant in the heat source unit 1 is recovered into the receiver tank 22 to repair the heat source unit 1. Alternatively, operations such as maintenance can be performed.

  Further, as shown in the internal side view of FIG. 5A, a substantially M-shaped angle 44 extending to the body of the receiver tank 22 is formed on the side surface of the heat exchange side control device 24 on the receiver tank 22 side. Is provided. FIG. 5B is an internal top view. This is because the receiver tank 22 has a columnar shape extending in the vertical direction, so that the receiver tank 22 is prevented from fluctuating during transportation and the heat of the receiver tank 22 is controlled by the heat exchange side control device 24. And the purpose as heat transfer means for preventing dew condensation in the heat exchange side control device 24. In the present embodiment, an angle 44 capable of transferring heat is provided between the receiver tank 22 and the heat exchange side control device 24. However, a part of the side surface of the heat exchange side control device 24 is provided as a part of the receiver tank 22. It may be formed and configured to be in surface contact with the outer peripheral surface of the body portion. As a matter of course, since the liquid refrigerant is stored in the receiver tank 22, the temperature of the receiver tank 22 is about 40 ° C. when the refrigeration apparatus 100 is operated. By transmitting the temperature of the receiver tank 22 to the heat exchanging side control device 24, it is possible to prevent condensation in the heat exchanging side control device 24 and, in general, to prevent condensation, the heat exchanging side control device. Since the heat insulating material provided so as to cover the outer wall of 24 can be reduced, the manufacturing cost can be reduced.

  Next, the operation of the refrigeration apparatus 100 will be described with reference to FIG.

  First, in the case of supplying cold water from the heat exchange unit 2 to the use side heat exchanger 30, when an instruction for operation is issued to the heat source unit 1 by a remote controller (not shown), the heat source side control device 16 receives this. The operation of the gas engine 10 is started. When the operation of the gas engine 10 is started, the operation of the compressor 11 is started by the driving force, and the high-temperature and high-pressure gas refrigerant is discharged. The discharged gas refrigerant flows into the outdoor heat exchanger 13, dissipates heat to the outside air by blowing air from the blow fans 14 and 14, and becomes a low-temperature and high-pressure liquid refrigerant, which is supplied from the refrigerant pipe 3a to the heat exchange unit 2. Is done.

  The liquid refrigerant circulates in the direction of arrow X, flows into the receiver tank 22 of the heat exchange unit 2 from the refrigerant pipe 3a, and performs refrigerant / water heat exchange in the refrigerant heat exchanger 20c via the check valve 23a. Heat is exchanged with the high-temperature and low-pressure gas refrigerant flowing through the vessels 20a and 20b, and the refrigerant is supercooled, depressurized by the electric expansion valve 21, and flows into the refrigerant / water heat exchanger 20a.

  In the refrigerant / water heat exchanger 20a, the cold / hot water flowing from the cold / hot water pipe 26a to the refrigerant / water heat exchanger 20a is cooled and evaporated. At this time, substantially half of the refrigerant evaporates and the refrigerant enters a gas-liquid mixed state. Next, the cold / hot water flowing into the refrigerant / water heat exchanger 20b and flowing into the refrigerant / water heat exchanger 20b from the cold / hot water pipe 26b is cooled and evaporated. At this time, most of the refrigerant evaporates, and the liquid refrigerant becomes a high-temperature and low-pressure gas refrigerant at this point. Then, in the refrigerant heat exchanger 20c, heat is exchanged with the refrigerant that is about to flow into the refrigerant / water heat exchanger 20a, and it is superheated, returns to the heat source unit 1 through the refrigerant pipe 3b, and passes through an accumulator (not shown). Then, it is returned to the compressor 11.

  On the other hand, the cold / hot water circulating to the use-side heat exchanger 30 is cooled by the refrigerant to become cold water, and the circulation pump 37 is operated, whereby the cold / hot water pipes 25a of the refrigerant / water heat exchangers 20a, 20b, Out of 25b. And as shown by the arrow Y, it joins by the cold / hot water piping 43a, flows in into the utilization side heat exchanger 30 via the cold / hot water piping 4a, and cools the heat medium connected to the load which is not shown in figure. The cold / hot water heat-exchanged with the heat medium in the use side heat exchanger 30 is divided into the cold / hot water pipes 26a, 26b via the cold / hot water pipes 4b, 43b, and again, the refrigerant / water heat exchanger 20a, Cooled at 20b.

  However, at this time, if the circulating pump 37 is not operated due to a failure or the like, the cold / hot water may freeze and expand to destroy the refrigerant / water heat exchangers 20a and 20b. .

  For this reason, freezing prevention sensors t3 and t4 are provided in the vicinity of the cold / hot water outlets of the refrigerant / water heat exchangers 20a and 20b, respectively. When it is detected that the temperature signal is equal to or lower than the first predetermined temperature Temp1, the heat exchange side control device 24 assumes that the cold / hot water flowing through one of the refrigerant / water heat exchangers 20a and 20b has a risk of freezing. It is judged and transmitted from the heat exchange side control device 24 to the heat source side control device 16 through a communication wiring (not shown), and the gas engine 10 of the heat source unit 1 is stopped. Here, it is desirable that the first predetermined temperature Temp1 is set to a temperature slightly higher than a temperature at which the cold / hot water starts to freeze.

  Further, as described above, since the refrigerant / water heat exchangers 20a and 20b are provided with the cold / hot water layer 33 in the outermost layers 36a and 36b, the temperature of the cold / hot water is accurately detected by the freeze prevention sensors t3 and t4. can do. As a result, there is no risk that the cold / hot water will be further cooled, so that freezing of the cold / hot water is avoided.

  Then, both the temperature signals detected by the freeze prevention sensors t3 and t4 are equal to or higher than the second predetermined temperature Temp2 higher than the first predetermined temperature, and at this time, the refrigeration apparatus 100 is operated by the remote controller (not shown). If the operation is instructed by, for example, the operation of the gas engine 10 is started again, and cold water is supplied from the heat exchange unit 2 to the use side heat exchanger 30. Here, the second predetermined temperature Temp2 is naturally not less than the first predetermined temperature Temp1, and it is desirable that the second predetermined temperature Temp2 be a minimum temperature without risk of freezing of the cold / hot water.

  In the refrigeration apparatus 100 of the present invention, as described above, the refrigerant outlet sensor T2 is provided on the refrigerant pipe in the vicinity of the second refrigerant outlet 54b, and the refrigerant inlet of the refrigerant / water heat exchanger 20a is provided. The refrigerant temperature signal detected by the refrigerant inlet sensor T1 (first refrigerant temperature sensor) provided on the refrigerant pipe near 34a and the refrigerant detected by the refrigerant outlet temperature sensor T2 (second refrigerant temperature sensor) By selecting one of the temperature signals and controlling the heat exchange side control device 24, the ability of the refrigeration apparatus 100 is emphasized without changing the software of the program stored in the heat exchange side control device 24. Thus, it is possible to select one of the driving and the driving focusing on energy saving.

  That is, by adopting the temperature signal of the refrigerant detected by the refrigerant inlet sensor T1, the heat exchange side control device 24 determines that the temperature of the refrigerant circulating in the heat exchange unit 2 is lower, An instruction is issued from the heat exchange side control device 24 to the heat source side control device 16 of the heat source unit 1 with a communication wiring (not shown) to reduce the operation capacity, and an operation with an emphasis on energy saving can be performed. By adopting the temperature signal of the refrigerant detected by the refrigerant outlet sensor T2, the heat exchange side control device 24 determines that the temperature of the refrigerant circulating in the heat exchange unit 2 is high, and heat exchange. The side control device 24 can instruct the heat source side control device 16 of the heat source unit 1 to operate with a sufficient operating capacity through communication wiring (not shown), and can perform an operation focusing on the capacity. Is shall.

  Switching between the refrigerant inlet sensor T1 and the refrigerant outlet sensor T2 is performed by providing a switch or the like in the heat exchange side control device 24 or the heat source side control device 16 and performing a switching operation of the switch or the like. Alternatively, the remote controller or the like may be provided with a selection switch, and the temperature signal detected by any one of the sensors T1 and T2 may be selected by operating the selection switch.

  A device that supplies cold water using a plate-type heat exchanger.

It is a figure explaining the system configuration | structure containing the refrigerant circuit of a freezing apparatus. It is an expanded view of a refrigerant | coolant / water heat exchanger. It is an expanded view of a refrigerant | coolant heat exchanger. It is the figure which showed the structure of the heat exchange unit. It is the figure which showed the connection of a receiver tank and a heat exchange side control apparatus. It is the figure which showed the circulation in the case of supplying cold water from a freezing apparatus, and cold / hot water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source unit 2 Heat exchange unit 3a, 3b Refrigerant piping 4a, 4b Cold / hot water piping 16 Heat source side control apparatus 20a, 20b Refrigerant / water heat exchanger 20c Refrigerant heat exchanger 21 Electric expansion valve 22 Receiver tank 23a, 23b Check valve 24 Heat exchange side control device 25a, 25b Chilled / hot water piping 26a, 26b Chilled / hot water piping 30 Usage side heat exchanger 40 Base frame 40a-40d Edge 43a, 43b Chilled / hot water piping 100 Refrigeration unit T1 Refrigerant inlet sensor T2 Refrigerant outlet sensor t1 , T2 Cold / hot water inlet sensor t3, t4 Freezing prevention sensor

Claims (2)

A heat source unit equipped with a compressor that compresses and discharges the refrigerant, and a heat exchange unit equipped with a heat exchanger that exchanges heat between the refrigerant and cold / hot water supplied to the use side heat exchanger; In the refrigeration apparatus configured, a refrigerant / water heat exchanger for exchanging heat between the refrigerant supplied from the heat source unit and the cold / hot water supplied to the user-side heat exchanger to the heat exchange unit, and the refrigerant A first refrigerant temperature sensor that provides a refrigerant heat exchanger that exchanges heat between the refrigerant that circulates upstream of the water heat exchanger and the refrigerant that circulates downstream, and detects the temperature of the refrigerant that circulates upstream. Providing a second refrigerant temperature sensor for detecting the temperature of the refrigerant flowing through the downstream side, and selecting the temperature of the refrigerant detected by the first refrigerant temperature sensor, whereby the upstream side of the refrigerant heat exchanger is Check the temperature of the circulating refrigerant The energy-saving operation is performed, and the temperature of the refrigerant circulating in the downstream side of the refrigerant heat exchanger is detected by selecting the refrigerant temperature detected by the second refrigerant temperature sensor. The refrigeration apparatus characterized by performing. Selection of the refrigerant temperature detected by the first refrigerant temperature sensor and the refrigerant temperature detected by the second refrigerant temperature sensor is performed by a switch provided in the heat exchange unit or the heat source unit. Alternatively, the refrigerating apparatus according to claim 1 , wherein the refrigerating apparatus is selected and operated by an operation switch provided on a remote controller or the like that instructs operation of the refrigerating apparatus.
A refrigeration system featuring refrigerant.

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