JP2008209012A - Refrigeration cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein cost is increased, due to newly requiring a bypass circuit and a flow regulating valve as a means for stopping only operation of a heat exchanger used for the high temperature, in a refrigerating cycle device having a plurality of applications. <P>SOLUTION: This refrigerating cycle device is provided with: a first refrigerant circuit 110 and a second refrigerant circuit 111; a first flow control valve 104 and a second flow control valve 109 controlling a refrigerant flow rate of the respective circuits; and an opening-closing valve 112 controlling opening-closing by connecting the respective circuits, and is improved in efficiency of the whole refrigerating cycle device by adjusting the refrigerant flow rate and a refrigerant flow passage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle apparatus having a plurality of functions such as a water heater and an air conditioner.

  As shown in FIG. 10, a conventional refrigeration cycle apparatus having a plurality of functions includes an indoor air conditioning unit that controls indoor air temperature and a floor heating unit that performs floor heating (for example, Patent Document 1). reference). That is, as the refrigerant circuit, the indoor heat exchanger 33 and the floor warming heat exchanger 34 are connected in parallel.

  In the refrigeration cycle apparatus configured as described above, when the compressor 31 is driven, the indoor heat exchanger 33 and the floor warming heat exchanger 34 function as a radiator, and the outdoor heat exchanger 37 functions as an evaporator. By doing so, indoor heating and floor hot water heating can be performed.

  By the way, in winter, it is desirable that the blowing temperature in indoor heating is higher than the temperature in floor heating. However, in the case of the configuration as described above, the refrigerant temperature flowing into the indoor heat exchanger 33 and the floor warming heat exchanger 34 is the same, and the comfort cannot be satisfied. Further, it is possible to add a temperature difference by further providing a pressure reducing valve or the like between the compressor 31 and the floor warming heat exchanger 34. In such a case, it is necessary to increase the pressure unnecessarily. Therefore, there is a problem that the system efficiency is lowered and the cost is increased.

Therefore, in order to solve such a problem, as shown in FIG. 11, the first heat exchanger 6 that uses the upstream side for high temperature and the second heat exchanger 8 that uses the downstream side for low temperature are used. As shown in FIG.
JP 58-160776 A JP 2006-322705 A (FIG. 2)

  However, in the case of the configuration shown in Patent Document 2, for example, when it is desired to stop the operation of the first heat exchanger 6 used for high temperature, the valves V1 and V3 for opening and closing are fully closed, and the connection pipe 30 is connected. It was necessary to open the provided valve V2. In such a case, there are problems that the number of valves is large and the cost is high and the valve control is complicated.

  In order to solve the above-described problems, the present invention minimizes the number of valves and controls the first refrigerant circuit, the second refrigerant circuit, the flow rate control valve for controlling the refrigerant flow rate of each circuit, and the respective circuits. And an open / close valve for controlling opening and closing, and adjusting the refrigerant flow rate and refrigerant flow path to achieve high efficiency.

  In order to solve the above-mentioned problem, the refrigeration cycle apparatus of the present invention according to claim 1 circulates in the order of the first compressor, the hot water supply heat exchanger, the hot water heating heat exchanger, the expansion device, and the evaporator. 1 refrigerant circuit, a first flow rate control valve that controls the flow rate of refrigerant flowing through the first refrigerant circuit, a second compressor, a heat exchanger for air conditioning and heating, the expansion device, and the evaporator in this order. And a second flow rate control valve for controlling a flow rate of the refrigerant flowing through the second refrigerant circuit, wherein the hot water supply heat exchanger outlet is one end and the other end is the second compressor. An on-off valve is provided in the middle of the bypass circuit connected to the outlet.

  According to this configuration, the pressure can be adjusted to an optimum pressure according to the temperature zone of the heat exchanger to be used, so that the efficiency of the entire refrigeration cycle apparatus can be increased.

  According to a second aspect of the present invention, there is provided the refrigeration cycle apparatus according to the present invention, further comprising control means for determining opening and closing of the on-off valve according to a hot water supply load and a hot water heating load.

  With this configuration, opening and closing control of the on-off valve is performed in accordance with the hot water heating load and the air conditioning heating load, and the operation frequency of the first compressor and the second compressor is controlled to have optimum efficiency. Therefore, the efficiency of the entire refrigeration cycle apparatus can be increased.

  According to a third aspect of the present invention, in the refrigeration cycle apparatus according to the present invention, when the hot water supply operation is stopped, the first flow rate control valve and the second flow rate control valve according to the hot water heating load and the air conditioning heating load. It has the control means which controls the opening degree of this.

  With this configuration, when the hot water heating load is larger than the air conditioning heating load, the opening degree of the first flow control valve is increased, and when the hot water heating load is smaller than the air conditioning heating load, the first flow control valve of the first flow control valve is increased. By reducing the opening degree, the efficiency of the entire refrigeration cycle apparatus can be increased.

  In the refrigeration cycle apparatus according to the fourth aspect of the present invention, when only the hot water heating operation is performed in a state where both the hot water supply operation and the air conditioning heating operation are stopped, the on-off valve is controlled to open, and the second compression It is characterized by operating only the machine.

  With this configuration, in the case of only the hot water heating operation, since only the second compressor is turned on, the refrigerant does not flow through the hot water supply heat exchanger. The efficiency of the entire refrigeration cycle apparatus can be increased at low cost without providing a closing valve.

  According to a fifth aspect of the present invention, in the state where the hot water heating operation is stopped, the refrigeration cycle apparatus according to the present invention includes the first flow rate control valve and the second flow rate control valve according to the operating states of hot water supply and air conditioning heating. The opening degree is controlled.

  With this configuration, when both hot water supply and air conditioning / heating are operating, the refrigerant pressure flowing through the hot water supply heat exchanger and the air conditioning / heating heat exchanger is different, but the first flow control valve and the second flow control valve are By controlling, the efficiency of the entire refrigeration cycle apparatus can be increased.

  The refrigeration cycle apparatus of the present invention according to claim 6 is characterized in that the expansion device is an expander.

  With this configuration, even when the expander inlet temperature becomes high, the efficiency of the entire refrigeration cycle apparatus can be kept high.

  According to the refrigeration cycle apparatus of the present invention, the on-off valve is controlled according to the hot water heating load and the air conditioning heating load, and the ON / OFF of the first compressor and the second compressor is optimally controlled. Therefore, the efficiency of the entire refrigeration cycle apparatus can be increased.

  Embodiments of the refrigeration cycle apparatus of the present invention will be described below with reference to the drawings.

(Embodiment 1)
The configuration of the refrigeration cycle apparatus of the present invention will be described with reference to FIG.

  As shown in FIG. 5, the refrigeration cycle apparatus of the present embodiment uses, for example, a refrigerant such as carbon dioxide as a working fluid, and the first compressor 101 that pressurizes the refrigerant, and the pressure is increased by the first compressor 101. A hot water supply heat exchanger 102 for cooling the refrigerant, a hot water heating heat exchanger 103, a first flow control valve 104 for controlling the refrigerant flow rate, a throttle device 105 for decompressing and expanding the refrigerant, and the throttle device 105 The first refrigerant circuit 110 is configured by sequentially connecting the evaporator 106 that heats the decompressed refrigerant to form a first refrigerant circuit 110, and the second compressor 107 that boosts the refrigerant, and the refrigerant that has been pressurized by the second compressor 107 The second refrigerant circuit 111 is configured by sequentially connecting the heat exchanger 108 for air conditioning and heating for cooling the air, the second flow control valve 109 for controlling the refrigerant flow rate, the expansion device 105, and the evaporator 106. Has been.

  Reference numeral 113 denotes a bypass circuit 113 for connecting the outlet of the hot water supply heat exchanger 102 and the outlet of the second compressor 107, and an on-off valve 112 is provided in the middle.

  As control means, first compressor operation control means 118 that controls operation ON / OFF of the first compressor 101 and second compressor operation control that controls operation ON / OFF of the second compressor 107. Means 119, and an on-off valve control means 120 for controlling opening and closing of the on-off valve 112, a first compressor discharge temperature detecting means 121 for detecting the refrigerant discharge temperature at the outlet of the first compressor 101, a second A second compressor discharge temperature detecting means 122 for detecting the refrigerant discharge temperature is provided at the outlet of the compressor 107.

  Moreover, the refrigeration cycle apparatus of the present embodiment includes a hot water supply unit, a hot water heating unit, and an air conditioning heating unit.

  The hot water supply unit is connected to the hot water supply hot water circuit 114 and the hot water supply hot water circuit 114 and is connected to the hot water supply heat exchanger 102 for heating the hot water supply water with the refrigerant and the hot water supply hot water circuit 114 to store the heated water. A hot water storage tank 116 is provided. The hot water supply unit operates during a hot water supply operation.

  The hot water heating unit is connected to a hot water circuit 115 for hot water heating and a hot water circuit for hot water heating, and is connected to a heat exchanger 103 for hot water heating for heating water for hot water heating with a refrigerant, and a hot water circuit 115 for hot water heating. And a radiator 117 that radiates the hot water heated by the heat exchanger for hot water heating 103. The hot water heating unit operates during hot water heating. In addition, if it is a use which can be utilized for warm water heating, 117 may be not only a radiator but for example, floor heating.

  The air conditioning heating unit includes an air conditioning heating heat exchanger 108 that exchanges heat between air and refrigerant, and a blower fan that sends heating air to the air conditioning heating heat exchanger 108. The air conditioning heating unit operates during air conditioning heating.

  The operating state of the refrigerant in the refrigeration cycle apparatus configured as described above will be described with reference to the Mollier diagram of FIG.

In the Mollier diagram of FIG. 2, the flow of the refrigerant flowing through the first refrigerant circuit 110 is indicated by A → B → C → D, and the flow of the refrigerant flowing through the second refrigerant circuit 111 is A → E → F → D. Indicated by Since the temperature of the hot water (or brine) required for the hot water supply application is higher than that for the hot water heating application or the air conditioning heating application, it is necessary to control the high pressure of the cycle used for the hot water supply application to 10 to 12 MPa. On the other hand, since the temperature used for hot water heating and air conditioning heating is lower than that for hot water supply, the high pressure of the refrigeration cycle is controlled to 8 to 10 MPa in order to increase the efficiency of the entire refrigeration cycle apparatus. Is desirable. That is, the high pressure of the refrigeration cycle needs to be increased as the required temperature increases, and the hot water outlet temperature for hot water use is 60 to 90 ° C., whereas the hot water outlet temperature for hot water heating is 35 to 35 ° C. Since the hot air temperature for air-conditioning heating use is 40-45 degreeC, it is desirable to control so that the high pressure of the refrigerating cycle for hot-water supply use may become the highest.

  Therefore, as shown in FIG. 2, in the refrigeration cycle in which hot water supply, hot water heating, and air conditioning heating are all operated, the high pressures of the first refrigerant circuit 110 and the second refrigerant circuit 111 are not the same and are controlled to optimum values. By doing so, a highly efficient refrigeration cycle can be realized. For example, when both hot water supply and air conditioning / heating are operated, the high pressure of the first refrigerant circuit may be set higher than the high pressure of the second refrigerant circuit.

  The refrigeration cycle apparatus of the present embodiment has a different control method depending on whether one of hot water supply, hot water heating, and air conditioning heating is operated. Accordingly, different operation patterns will be described next depending on what purpose the refrigeration cycle apparatus of the present embodiment is used for.

  FIG. 1 shows a flowchart when hot water supply, hot water heating, and air conditioning heating are turned ON / OFF, respectively. For example, when using any of hot water supply, hot water heating, and air conditioning heating, the operation pattern a is selected. As another example, when the air conditioning heating operation and the hot water heating operation are performed and the hot water supply operation is not performed, the operation pattern e is selected.

  For each such operation pattern, a hot water heating unit, a hot water supply unit, an air conditioning heating unit, a first compressor 101, a second compressor 107, a first flow control valve 104, a second flow control valve 109, and an open / close Table 1 shows how the valve 112 is controlled.

  For example, in the case of the operation pattern a, all of the hot water heating unit, the hot water supply unit, and the air conditioning heating unit are operated, and further, the first compressor and the second compressor are operated. The first flow control valve and the second flow control valve are in a flow control state, and the on-off valve is in a closed state. In addition, when the hot water heating operation and the hot water supply operation are performed and the air conditioning heating operation is not performed, when the first and second compressors are operated, only the first compressor is operated and the second compressor is operated. May not drive. Therefore, the former operation pattern is described separately as b-1, and the latter operation pattern as b-2.

  Hereinafter, each operation pattern will be described in detail.

(A) When performing hot water heating operation, hot water supply operation, and air conditioning heating operation When there is an instruction to start all of hot water supply, hot water heating, and air conditioning heating, in step 201, the first compressor 101 and the second compressor Each of the compressors 107 starts to operate, and the on-off valve 112 is controlled to be fully closed. In step 202, the temperature Td1 detected by the first compressor discharge temperature detecting means 121 is compared with the set temperature Tm1, and if Td1 is larger than Tm1, the process proceeds to step 203 and the first flow control valve 104 is turned on. Control to increase the opening. As a result, the discharge temperature Td1 is balanced so as to decrease, so that the discharge temperature Td1 can be controlled so as to approach the target value. On the other hand, when Td1 is equal to or lower than Tm1, the routine proceeds to step 204 where control is performed so as to reduce the opening of the first flow control valve 104. As a result, the discharge temperature Td1 is balanced so as to increase, so that the discharge temperature Td1 can be controlled so as to approach the target value. In step 205, the temperature Td2 detected by the second compressor discharge temperature detecting means 122 and the set temperature Tm2 are compared. If Td2 is larger than Tm2, the process proceeds to step 206 and the second flow control valve 109 is turned on. Control to increase the opening. As a result, the discharge temperature Td2 is balanced so as to decrease, so that it can be controlled so as to approach the target value, and the process returns to step 201. On the other hand, when Td2 is equal to or less than Tm2, the process proceeds to step 207, and the second flow control valve 109 is controlled so as to reduce the opening degree. As a result, the discharge temperature Td2 is balanced so as to increase, so that the discharge temperature Td2 can be controlled to approach the target value, and the process returns to step 201. Although not explicitly shown in the flowchart, the throttle device 105 controls the opening degree of the valve so that the suction superheat of the first compressor 101 and the second compressor 107 becomes an optimum value (for example, 5 ° C.). Is done. Therefore, by controlling to match the discharge temperature, it is possible to match the target discharge pressure.

  As described above, according to the temperature zone of the heat exchanger to be used, the pressure of each use-side heat exchanger can be adjusted to an optimum value, so that the efficiency of the entire refrigeration cycle apparatus can be increased. .

(B-1), (b-2) When performing hot water heating operation and hot water supply operation and not performing air conditioning heating operation In the refrigeration cycle apparatus of the present embodiment, performing hot water heating operation and hot water supply operation and performing air conditioning heating operation The operation when not implemented will be described with reference to the flowchart of FIG.

When there is an instruction to stop operation of hot water supply and hot water heating and only air conditioning heating, in step 301, control is performed so that the first compressor 101 starts operation and the second compressor 107 stops. Then, the process proceeds to step 302. In step 302, the temperature Td1 detected by the first compressor discharge temperature detecting means 121 is compared with the set temperature Tm1, and if Td1 is larger than Tm1, the process proceeds to step 303 and the first flow control valve 104 is turned on. Control to increase the opening. As a result, the discharge temperature Td1 is balanced so as to decrease, so that the discharge temperature Td1 can be controlled so as to approach the target value. On the other hand, when Td1 is equal to or less than Tm1, the process proceeds to step 304, and the first flow control valve 104 is controlled to reduce the opening. As a result, the discharge temperature Td1 is balanced so as to increase, so that the discharge temperature Td1 can be controlled so as to approach the target value. In step 305, the sum Q1 of the hot water heating load Qd and the hot water supply load Qky is compared with the set load Qm1 (for example, the maximum capacity 6 kW of the first compressor 101). This means that the required load cannot be satisfied with only the machine, and the process proceeds to step 306 where the second compressor 107 is turned on, the on-off valve 112 is fully opened, and the opening degree of the second flow control valve 109 is increased. Control to be fully closed. As a result, the refrigerant discharged from the second compressor flows through the hot water heating heat exchanger 103, so that the required load can be satisfied, and the process returns to step 301. Further, when Q1 is equal to or less than Qm1, it indicates that the required load is satisfied only by the first compressor, the process proceeds to step 307, the second compressor 107 is turned OFF, and the on-off valve 112 is fully closed. Then, the process returns to step 301. That is, step 306 is the driving pattern b-1, and step 307 is the driving pattern b-2.

  FIG. 4 shows the relationship between the compressor frequency and the compressor efficiency in the second embodiment of the present invention. In other words, the compressor rotation speed represents a certain value and the compressor efficiency peaked. Two compressors were operated rather than operating at a high rotation speed (point C) with one compressor. A highly efficient refrigeration cycle operation can be performed by operating at a value close to the optimum rotational speed (point B). That is, the set load Qm1 is not necessarily the maximum capacity of 6 kW of the first compressor 101, and a lower value may be selected.

  Here, the hot water heating load Qd includes the hot water heating inlet temperature T1 (for example, 30 ° C.) detected by the hot water heating inlet temperature detecting means 123, the required hot water heating temperature T2 (for example, 35 ° C.) from the user, and the hot water heating. Using the water flow rate Gd (for example, 6 L / min) of the irrigation circuit 115, the hot water supply load Qky is obtained as shown in the following (formula 1), and the hot water supply inlet temperature detecting means 124 detects the hot water supply inlet temperature T3 (for example, 10 ° C.), the required hot water supply temperature T4 (for example, 90 ° C.), and the water flow rate Gky (for example, 1 L / min) of the hot water supply water circuit 114, can be obtained as shown in the following (formula 2). At this time, Qd is about 2.0 kW, and Qky is about 5.5 kW.

Qd = Gd * C * (T2-T1) (Formula 1)
Qky = Gky * C * (T4-T3) (Formula 2)
C: Water specific heat * water density As can be seen from Equations 1 and 2, the required load increases as the difference between the required hot water temperature and the inlet hot water temperature increases. Note that Gd and Gky can be estimated to some extent if the relationship between the water pump rotation speed and the flow rate is known in advance, and thus do not necessarily need to be measured in real time.

  As described above, it is possible to control the number of operating compressors and the refrigerant circuit according to the total required load of the heat exchanger to be used, while operating at a compressor speed that provides relatively high compressor efficiency. Since the required load can be satisfied, a highly efficient refrigeration cycle apparatus can be operated without impairing user comfort.

(C) When performing hot water heating operation and air conditioning heating operation and not performing hot water supply operation In the refrigeration cycle apparatus of the present embodiment, the operation when performing hot water heating operation and air conditioning heating operation and not performing hot water supply operation, This will be described with reference to the flowchart of FIG.

  In the case where there is an instruction to start operation of hot water heating and air conditioning heating and stop only hot water supply, in step 401, the first compressor 101 stops operation, the second compressor 107 starts operation, The on-off valve 112 is controlled to be fully opened, and the process proceeds to step 402. In step 402, the temperature Td2 detected by the second compressor discharge temperature detecting means 122 and the set temperature Tm2 are compared. If Td2 is larger than Tm2, the process proceeds to step 403, and the opening degree of the expansion device 105 is increased. Control to do. As a result, the discharge temperature Td2 is balanced so as to decrease, so that the discharge temperature Td2 can be controlled to approach the target value, and the process proceeds to step 405. On the other hand, if Td2 is equal to or less than Tm2, the process proceeds to step 404, and control is performed so that the opening degree of the expansion device 105 is reduced. Thus, since the discharge temperature Td2 is balanced so as to increase, the discharge temperature Td2 can be controlled to approach the target value, and the process proceeds to step 405. In step 405, the hot water heating load Qd is compared with the sum of the air conditioning heating load Qku and the set load Qm2. In step 406, control is performed so that the valve opening of the second flow control valve 109 is decreased so that the valve opening of the first flow control valve 104 is increased.

  As a result, a large amount of refrigerant flows to the hot water heating heat exchanger, so that the hot water heating capacity can be increased without changing the additional operation or operating frequency of the compressor, and the process returns to step 401. Further, when Qd is smaller than (Qku + Qm2), it indicates that the hot water heating load is not larger than necessary, and the routine proceeds to step 407 so that the valve opening degree of the first flow control valve 104 is decreased. Control is performed to increase the valve opening degree of the second flow control valve 109. As a result, a large amount of refrigerant flows through the heat exchanger for air conditioning and heating, so that the temperature of the refrigerant joining at the inlet of the expansion device 105 can be lowered, so that the efficiency of the entire refrigeration cycle apparatus can be increased. Return to.

  The air-conditioning heating load Qku includes the air inlet temperature T5 (for example, 20 ° C.) detected by the air inlet temperature detecting means 125, the indoor required temperature T6 (for example, 25 ° C.) from the user, and the air outlet temperature T7 corresponding to T6. (For example, 45 ° C.) and the indoor required air volume Q1 (for example, 10 m 3 / h) from the user or the like, can be obtained by the following simple (formula 3). At this time, Qku is about 4.6 kW.

Qku = C * Q1 * (T7-T5) (Formula 3)
C: Specific air heat As described above, the opening degree of the first flow rate control valve and the second flow rate control valve is controlled according to the hot water heating load and the air conditioning heating load without impairing comfort. The efficiency of the refrigeration cycle apparatus can be increased.

(D) When only the hot water heating operation is performed and the hot water supply operation and the air conditioning operation are not performed In the refrigeration cycle apparatus of the present embodiment, the operation when only the hot water heating operation is performed and the hot water supply operation and the air conditioning operation are not performed is illustrated in FIG. It demonstrates using the flowchart of these.

  When there is an instruction to start the hot water heating operation and stop the hot water supply and air conditioning heating, in step 501, the first compressor 101 stops operating, the second compressor 107 starts operating, and the on-off valve 112 is fully opened, the second flow control valve 109 is controlled to be fully closed, and the process proceeds to step 502. In step 502, the temperature Td2 detected by the second compressor discharge temperature detecting means 122 and the set temperature Tm2 are compared. If Td2 is larger than Tm2, the process proceeds to step 503 and the opening degree of the expansion device 105 is increased. Control to do. As a result, the discharge temperature Td2 is balanced so as to decrease, so that it can be controlled so as to approach the target value, and the process returns to step 501. On the other hand, if Td2 is equal to or less than Tm2, the process proceeds to step 504, and the opening degree of the expansion device 105 is controlled to be reduced. As a result, the discharge temperature Td2 is balanced so as to increase, so that the discharge temperature Td2 can be controlled to approach the target value, and the process returns to step 501.

  That is, when the hot water supply operation is stopped, it is desirable not to operate the first compressor 101 but to operate only the second compressor 107 and control the high pressure to be 8 to 10 MPa.

  As described above, since the refrigerant does not flow unnecessarily through the hot water supply heat exchanger, the efficiency of the refrigeration cycle apparatus can be increased.

(E, f, g) When Hot Water Heating Operation is Not Performed In the refrigeration cycle apparatus of the present embodiment, an operation when the hot water heating operation is not performed will be described using the flowchart of FIG.

If there is an instruction to stop the hot water heating operation, in step 601, the valve opening degree of the on-off valve 112 is controlled to be fully closed, and the process proceeds to step 602 to determine whether the hot water supply operation is ON. If it is determined that the hot water supply operation is “ON”, the process proceeds to step 603. After the first compressor 101 is turned “ON”, the process proceeds to step 605 to determine whether the air conditioning heating operation is “ON”. If it is determined that the air-conditioning / heating operation is “ON”, the process proceeds to step 607, the second compressor 107 is set to “ON”, the process proceeds to step 610, and the discharge temperature Td1 becomes the set temperature Tm1, and After controlling the discharge temperature Td2 to be the set temperature Tm2, the process returns to step 601. This step 610 is a control means A for controlling the valve opening degree of the first flow control valve 104 and the second flow control valve 109, and since it is the same operation as steps 201 to 207 in FIG. . If it is determined in step 605 that the air-conditioning / heating operation is “OFF”, the process proceeds to step 608 to turn the second compressor 107 “OFF” and then proceed to step 610.

  If it is determined in step 602 that the hot water supply operation is “OFF”, the process proceeds to step 604. After the first compressor 101 is turned “OFF”, the process proceeds to step 606 to determine whether the air conditioning heating operation is “ON”. To do. If it is determined that the air conditioning / heating operation is “ON”, the process proceeds to step 607. If it is determined in step 606 that the air-conditioning / heating operation is “OFF”, the process proceeds to step 609 to turn on the second compressor 107 and then proceed to step 611. In step 611, control is performed so that the discharge temperature Td2 becomes the set temperature Tm2, and then the process returns to step 601. This step 611 is a control means B for controlling the valve opening degree of the second flow control valve 109, and since it is the same operation as steps 205 to 207 in FIG.

  That is, the route from step 601 to 607 to 610 is the operation pattern e, the route from step 601 to 608 to 610 is the operation pattern f, and from step 601 to 609 to 611 The route to reach is the driving pattern g.

  As described above, although the refrigerant pressures flowing through the hot water supply heat exchanger and the air conditioning / heating heat exchanger are different, the first flow control valve and the second flow control valve according to the operating state of the hot water supply and air conditioning / heating. By controlling this, the efficiency of the entire refrigeration cycle apparatus can be increased.

  The refrigeration cycle apparatus according to the present invention can be used as a refrigeration cycle apparatus for other uses such as bathroom drying and snow melting.

In the refrigeration cycle apparatus of Embodiment 1 of the present invention, an operation flowchart when hot water supply, hot water heating, and air conditioning heating are each turned ON / OFF. Mollier diagram showing the refrigeration cycle in Embodiment 1 of the present invention In the refrigeration cycle apparatus of Embodiment 1 of the present invention, a control flowchart in the case of the operation pattern (a). Relationship diagram between compressor frequency and compressor efficiency in Embodiment 1 of the present invention The block diagram which shows the refrigerating-cycle apparatus in Embodiment 1 of this invention. In the refrigeration cycle apparatus of Embodiment 1 of the present invention, a control flowchart in the case of the operation pattern (b). In the refrigeration cycle apparatus of Embodiment 1 of the present invention, a control flowchart in the case of the operation pattern (c). In the refrigeration cycle apparatus of Embodiment 1 of the present invention, a control flowchart in the case of the operation pattern (d). In the refrigeration cycle apparatus of Embodiment 1 of the present invention, a control flowchart in the case of an operation pattern (e, f, g). The block diagram which shows the refrigerating cycle apparatus of a prior art (patent document 1) The block diagram which shows the refrigerating cycle apparatus of a prior art (patent document 2)

Explanation of symbols

6 First Heat Exchanger 8 Second Heat Exchanger 30 Connecting Pipe 31 Compressor 33 Indoor Heat Exchanger 34 Floor Heat Exchanger 37 Outdoor Heat Exchanger 101 First Compressor 102 Heat Exchanger 103 for Hot Water Supply Heat exchanger for hot water heating 104 First flow control valve 105 Throttle device 106 Evaporator 107 Second compressor 108 Heat exchanger for air conditioning heating 109 Second flow control valve 110 First refrigerant circuit 111 Second refrigerant Circuit 112 On-off valve 113 Bypass circuit 114 Hot water circuit for hot water supply 115 Hot water circuit for hot water heating 116 Hot water storage tank 117 Radiator 118 First compressor operation control means 119 Second compressor operation control means 120 On-off valve control means 121 First Compressor discharge refrigerant temperature detection means 122 Second compressor discharge refrigerant temperature detection means 123 Hot water heating inlet temperature detection means 124 Hot water supply inlet temperature Degree detection means 125 Air inlet temperature detection means

Claims (6)

The first refrigerant circuit in which the refrigerant circulates in the order of the first compressor, the hot water supply heat exchanger, the hot water heating heat exchanger, the expansion device, and the evaporator, and the flow rate of the refrigerant flowing through the first refrigerant circuit are controlled. A first flow rate control valve, a second compressor, a heat exchanger for air conditioning and heating, the expansion device, a second refrigerant circuit circulating in the order of the evaporator, and a refrigerant flow rate flowing through the second refrigerant circuit A refrigeration cycle apparatus having a second flow rate control valve for controlling the flow rate, having a hot water supply heat exchanger outlet as one end, and an open / close valve in the middle of a bypass circuit connecting the other end to the second compressor outlet. According to the present invention, there is provided second compressor operation control means for controlling the operation of the second compressor according to the sum of hot water supply load and hot water heating load, and on-off valve control means for determining opening / closing of the on-off valve. The refrigeration cycle apparatus according to claim 1, wherein: In a state where the hot water supply operation is stopped, it has control means for controlling the opening degree of the first flow rate control valve and the second flow rate control valve according to the hot water heating load and the air conditioning heating load. The refrigeration cycle apparatus according to claim 1. 2. The method according to claim 1, wherein when only the hot water heating operation is performed in a state where both the hot water supply operation and the air conditioning heating operation are stopped, the on-off valve is controlled to open, and only the second compressor is operated. Refrigeration cycle equipment. 2. The opening of the first flow control valve and the second flow control valve is controlled in accordance with operating states of hot water supply and air conditioning heating when the hot water heating operation is stopped. The refrigeration cycle apparatus described. The refrigeration cycle apparatus according to claim 1, wherein the expansion device is an expander.

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