WO2015104815A1

WO2015104815A1 - Combined air-conditioning and hot-water-supply system

Info

Publication number: WO2015104815A1
Application number: PCT/JP2014/050214
Authority: WO
Inventors: 智一川越; 博文 ▲高▼下; 宏典薮内
Original assignee: 三菱電機株式会社
Priority date: 2014-01-09
Filing date: 2014-01-09
Publication date: 2015-07-16
Also published as: GB201601241D0; JPWO2015104815A1; GB2537453A

Abstract

Provided is a control means (320) that includes, as a control mode during a simultaneous operation in which both a heating operation and a water heating operation are performed, the following: a tapping temperature priority mode in which a hot-water supply side throttle device (312) is controlled on the basis of the required capacity of a hot-water supply unit (310), and the heating operation of an indoor unit (210) is prohibited; and a continuation mode in which the simultaneous operation is continued. The control means (320) switches the control mode during the simultaneous operation to the tapping temperature priority mode or the continuation mode in accordance with the inlet temperature of a heat medium in a refrigerant-to-water heat exchanger (311).

Description

Air conditioning and hot water supply complex system

The present invention relates to an air conditioning and hot water supply combined system capable of performing an air conditioning operation and a heating operation using cold water or hot water generated using a heat pump cycle.

There has been proposed an air-conditioning and hot-water supply combined system that is equipped with a heat pump cycle, receives heat from a heat source (air or water), and supplies the heat to a plurality of indoor units or hot water supply units (see, for example, Patent Document 1).

The air conditioning and hot water supply combined system described in Patent Document 1 includes at least one heat source unit on which a compressor and a heat source side heat exchanger are mounted, and at least one on which an indoor side heat exchanger and an indoor side expansion device are mounted. At least one heating unit in which a water-refrigerant heat exchanger and a hot water supply side expansion device are mounted, and the indoor heat exchanger functions as a condenser or a radiator. A refrigerant circuit to be performed, and a water circuit to perform at least a heating operation of heating water by exchanging heat with the refrigerant of the refrigerant circuit and a water-refrigerant heat exchanger, and air conditioning operation (heating operation) with one refrigerant system; This is a system that enables simultaneous hot water supply operation (heating operation).

Thus, since Patent Document 1 is not a system in which different refrigerant systems are connected in a complicated manner, an air conditioning and hot water supply complex system can be constructed at a very low cost.

International Publication No. 2013/046269 (Fig. 1 etc.)

In the simultaneous operation in which the heating operation and the heating operation are performed simultaneously in the above-described system, the compressor is controlled so that the condensation temperature becomes constant to the target condensation temperature, and the subcooling degrees of the indoor unit and the hot water supply unit are respectively Supercooling degree control is performed to individually control the indoor side throttle device and the hot water supply side throttle device so as to achieve a corresponding target supercooling degree. In this control, when the inlet water temperature of the hot water supply unit is in a low water temperature range (for example, 25 ° C. to 35 ° C.), the target supercooling degree on the hot water supply unit side needs to be increased. In this case, the hot water supply side throttle device is throttled in order to achieve the target degree of subcooling. As a result, the amount of refrigerant flowing through the hot water supply unit is reduced and heat cannot be transmitted to the water circuit side, and the hot water temperature is reduced. There was a problem of lowering.

As another system, the hot water supply unit is used as a capacity control, and the indoor unit is controlled to a supercooling degree (the indoor throttling device is controlled so that the target cooling temperature is kept constant and the supercooling degree becomes the target supercooling degree). System). In this system, when the inlet water temperature of the hot water supply unit is in a low water temperature range and the load on the hot water supply side is high, the heating capacity on the indoor unit side temporarily decreases significantly, and the blowout temperature decreases on the indoor unit side, resulting in a feeling of cold wind. There was a problem of inviting.

The present invention has been made to solve the above-described problems, and is an air-conditioning and hot water supply complex capable of suppressing a decrease in hot water temperature and a feeling of cold wind even when the inlet water temperature of the hot water supply unit is in a low water temperature range. The purpose is to provide a system.

The combined air conditioning and hot water supply system according to the present invention includes at least one heat source unit on which a compressor and a heat source side heat exchanger are mounted, and at least one indoor unit on which an indoor side heat exchanger and an indoor expansion device are mounted. And at least one hot water supply unit on which a hot water supply side heat exchanger and a hot water supply side expansion device are mounted, and a refrigerant circuit that performs at least a heating operation in which the indoor heat exchanger functions as a condenser or a radiator, An air-conditioning and hot-water supply complex system comprising a refrigerant in a refrigerant circuit and a hot water supply circuit that performs at least a heating operation for heating a heat medium by exchanging heat with a hot water supply side heat exchanger, and performing both a heating operation and a heating operation As a control mode during the simultaneous operation, the hot water supply side throttle device is controlled based on the required capacity of the hot water supply unit, and the hot water temperature priority mode for prohibiting the heating operation of the indoor unit is performed simultaneously. Control means having a continuation mode for continuing the rotation, and the control means switches the control mode during simultaneous operation to the hot water temperature priority mode or the continuation mode according to the inlet temperature of the heat medium in the hot water supply side heat exchanger. It is.

According to the present invention, even when the inlet water temperature of the hot water supply unit is in the low water temperature range, it is possible to suppress the decrease in the hot water temperature of the hot water supply unit and the feeling of cold air.

It is a refrigerant circuit figure which shows an example of the refrigerant circuit structure of the air conditioning hot-water supply complex system which concerns on Embodiment 1 of this invention. It is the figure which showed the relationship between the supercooling degree of the hot water supply unit of FIG. 1, and the inlet water temperature of a hot water supply unit. It is a figure which shows the control outline | summary of each in the hot water temperature priority mode and continuation mode in the air-conditioning / hot-water supply combined system which concerns on Embodiment 1 of this invention. It is explanatory drawing of switching of the control mode in the air-conditioning / hot-water supply combined system which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the mode switching threshold values A and B which switch between the hot water temperature priority mode and the continuation mode in the air-conditioning and hot water supply complex system according to Embodiment 1 of the present invention. It is a flowchart of control mode judgment of the air-conditioning / hot-water supply combined system which concerns on Embodiment 1 of this invention. It is a flowchart of control mode judgment of the air-conditioning / hot-water supply combined system which concerns on Embodiment 1 of this invention. It is a control-operation flowchart of the hot-water supply side throttle apparatus in the air-conditioning hot-water supply complex system according to Embodiment 1 of the present invention. It is a control-operation flowchart regarding the driving | running | working restrictions process of the indoor unit in the air-conditioning / hot-water supply complex system which concerns on Embodiment 1 of this invention. It is a control-operation flowchart in the water sampling defrosting operation availability in the air-conditioning / hot-water supply complex system according to Embodiment 1 of the present invention.

(Circuit configuration)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a refrigerant circuit diagram illustrating an example of a refrigerant circuit configuration of an air-conditioning and hot water supply complex system according to Embodiment 1 of the present invention. Based on FIG. 1, a structure and operation | movement of an air conditioner are demonstrated.

The combined air conditioning and hot water supply system according to the present embodiment is installed in a building, condominium, hotel, etc., and can simultaneously supply an air conditioning load (cooling load, heating load) and a hot water supply load by using a refrigeration cycle that circulates refrigerant. It is.

(Constitution)
The combined air conditioning and hot water supply system 100 includes at least a heat source unit (outdoor unit) 110, a load side unit (indoor unit) 210, and a hot water supply unit 310. Among these, the indoor unit 210 and the hot water supply unit 310 are connected to the heat source unit 110 in parallel.

The heat source unit 110 and the indoor unit 210 are connected by a liquid main pipe 1 that is a refrigerant pipe, a liquid branch pipe 4a that is a refrigerant pipe, a gas branch pipe 3a that is a refrigerant pipe, and a gas main pipe 2 that is a refrigerant pipe. The heat source unit 110 and the hot water supply unit 310 are connected by a liquid main pipe 1 that is a refrigerant pipe, a liquid branch pipe 4b that is a refrigerant pipe, a gas branch pipe 3b that is a refrigerant pipe, and a gas main pipe 2 that is a refrigerant pipe.

(Heat source unit 110)
The heat source unit 110 has a function of supplying hot or cold heat to the indoor unit 210 and the hot water supply unit 310. The heat source unit 110 includes a compressor (heat source side compressor) 111, a flow path switching valve 112 as a flow path switching means, a heat source side heat exchanger 113, and an accumulator 115 connected in series. Has been. Further, the heat source unit 110 is provided with a blower 114 such as a fan for supplying air to the heat source side heat exchanger 113 in the vicinity of the heat source side heat exchanger 113.

The compressor 111 sucks the refrigerant flowing through the gas main pipe 2 and compresses the refrigerant to bring it into a high temperature / high pressure state. The compressor 111 is not particularly limited as long as it can compress the sucked air-conditioning refrigerant to a high pressure state. For example, the compressor 111 can be configured using various types such as reciprocating, rotary, scroll, or screw. The compressor 111 may be of a type that can be variably controlled by an inverter.

The flow path switching valve 112 switches the flow of the air conditioning refrigerant according to the required operation mode (cooling or heating). The heat source side heat exchanger 113 functions as a radiator (condenser) during the cooling cycle, and functions as an evaporator during the heating cycle, and performs heat exchange between the air supplied from the blower 114 and the refrigerant to condense or liquefy the refrigerant. Evaporative gasification. The accumulator 115 is disposed on the suction side of the compressor 111 and stores excess refrigerant. The accumulator 115 may be any container that can store excess refrigerant.

(Indoor unit 210)
The indoor unit 210 has a function of receiving heating or cooling supply from the heat source unit 110 and taking charge of heating load or cooling load. In the indoor unit 210, an indoor expansion device 212 and an indoor heat exchanger 211 are mounted connected in series. In addition, in FIG. 1, although the state in which the one indoor unit 210 is mounted is shown as an example, the number is not particularly limited. The indoor unit 210 may be provided with a blower such as a fan for supplying air to the indoor heat exchanger 211 in the vicinity of the indoor heat exchanger 211.

The indoor expansion device 212 has a function as a pressure reducing valve or an expansion valve, and expands the refrigerant by reducing the pressure. The indoor throttle device 212 may be configured by a device whose opening degree can be variably controlled, for example, a precise flow rate control means using an electronic expansion valve, an inexpensive refrigerant flow rate control means such as a capillary tube, or the like. A gas pipe temperature detection sensor 213G and a liquid pipe temperature detection sensor 213L are installed in the front and rear pipes of the indoor heat exchanger 211. Based on the temperature data information obtained from these sensors, the control means 220 determines the control amount of the indoor expansion device 212 and controls the refrigerant flow rate of the indoor expansion device 212. The indoor heat exchanger 211 functions as a radiator (condenser) during the heating cycle and as an evaporator during the cooling cycle, and performs heat exchange between the air supplied from a blower (not shown) and the refrigerant to condense the refrigerant. It is liquefied or vaporized gas.

(Hot water supply unit 310)
The hot water supply unit 310 has a function of receiving a supply of hot or cold heat from the heat source unit 110 and taking charge of a hot water supply load or a cooling load. The hot water supply unit 310 is equipped with a hot water supply side expansion device 312 and a hot water supply side heat exchanger (refrigerant-water heat exchanger) 311 connected in series. In addition, in FIG. 1, although the state in which one hot water supply unit 310 is mounted is shown as an example, the number is not particularly limited.

The hot water supply side throttle device 312 has a function as a pressure reducing valve or an expansion valve, and expands the refrigerant by decompressing it. The hot water supply side throttling device 312 may be configured by a device whose opening degree can be variably controlled, for example, a precise flow rate control means using an electronic expansion valve, an inexpensive refrigerant flow rate control means such as a capillary tube, or the like. A gas pipe temperature detection sensor 313G and a liquid pipe temperature detection sensor 313L are installed in the front and rear pipes of the refrigerant-water heat exchanger 311. Based on the temperature data information obtained from these sensors, the control unit 320 determines the control amount of the hot water supply side expansion device 312 and performs the refrigerant flow rate control of the hot water supply side expansion device 312. The refrigerant-water heat exchanger 311 functions as a radiator (condenser) during the heating cycle and as an evaporator during the cooling cycle, and is supplied with water supplied from the water pipes 11 (11a, 11b) of the water circuit 10 serving as a hot water supply circuit. Heat exchange is performed with the refrigerant, and the refrigerant is condensed or evaporated.

The hot water supply unit 310 further includes a bypass pipe 314 that bypasses the hot water supply side expansion device 312 and the refrigerant-water heat exchanger 311 and a bypass valve 315 that controls the flow rate of the bypass pipe 314. The bypass pipe 314 and the bypass valve 315 are used in “standard defrosting operation” described later, and the bypass valve 315 is always closed in other operations.

The water circuit 10 includes a pump and a hot water storage tank (not shown). That is, the water circuit 10 is established by circulating the water heated or cooled by the refrigerant-water heat exchanger 311 with the pump. Note that the water pipe 11 constituting the water circuit 10 may be constituted by a copper pipe, a stainless pipe, a steel pipe, a vinyl chloride pipe, or the like. Further, although water has been described as an example of the heat medium circulating in the water circuit 10, it is not limited to water and may be an antifreeze or the like. Further, the water circuit 10 includes an inlet water temperature detection sensor 10a that detects the inlet water temperature, and an outlet water temperature detection sensor 10b that detects an outlet water temperature (hereinafter also referred to as hot water temperature).

Each of the heat source unit 110, the indoor unit 210, and the hot water supply unit 310 has a control means 120, a control means 220, and a control means 320. Each control means uses the communication means 400, and the information that each has. introduce. The control means 120, the control means 220, and the control means 320 are each constituted by a microcomputer or a DSP.

The control means 120 of the heat source unit 110 has a function of controlling the refrigerant pressure state and the refrigerant temperature state in the air conditioning and hot water supply complex system 100. Specifically, the control unit 120 controls the operating frequency of the compressor 111, the heat source side heat exchanger 113 is divided into a plurality of heat exchangers, and is not shown on the primary side of the heat source side heat exchanger 113. If the on-off valve is configured for each heat exchanger, the on-off valve is controlled to change the heat exchange area of the heat source side heat exchanger 113, the fan rotation speed of the blower 114 is controlled, It has a function of switching the path switching valve 112.

The control means 220 of the indoor unit 210 uses the information obtained from the gas pipe temperature detection sensor 213G and the liquid pipe temperature detection sensor 213L to determine the degree of superheat during the cooling operation of the indoor unit 210 and the heating operation of the indoor unit 210. Has a function of controlling the degree of supercooling. Specifically, in the control means 220, the indoor heat exchanger 211 is divided into a plurality of heat exchangers, and an on-off valve (not shown) is installed on the primary side of the indoor heat exchanger 211 for each heat exchanger. If it is a structure, it controls the on-off valve to change the heat exchange area of the indoor heat exchanger 211, controls the fan rotation speed of a blower (not shown), and controls the opening of the indoor expansion device 212. It has a function to do.

The control means 320 of the hot water supply unit 310 is based on information obtained from the gas pipe temperature detection sensor 313G, the liquid pipe temperature detection sensor 313L, the inlet water temperature detection sensor 10a, and the outlet water temperature detection sensor 10b, during the cooling operation of the hot water supply unit 310. And the function of controlling the degree of supercooling during the heating operation of the hot water supply unit 310 or the hot water temperature. Specifically, in the control means 320, the refrigerant-water heat exchanger 311 is divided into a plurality of heat exchangers, and an on-off valve (not shown) is installed on the primary side of the refrigerant-water heat exchanger 311 for each heat exchanger. With this configuration, the on-off valve is controlled to change the heat exchange area of the refrigerant-water heat exchanger 311 and to control the opening degree of the hot water supply side expansion device 312.

1 illustrates a configuration in which each unit has a control unit and transmits information to each other to perform a cooperative process. However, a configuration in which a control unit for controlling the entire air conditioning and hot water supply complex system 100 is also provided. Good.

Although not shown, the air conditioning and hot water supply complex system 100 includes a sensor that detects the refrigerant discharge pressure, a sensor that detects the refrigerant suction pressure, a sensor that detects the refrigerant discharge temperature, and a refrigerant suction temperature. A sensor, a sensor for detecting the temperature of the refrigerant flowing into and out of the heat source side heat exchanger 113, a sensor for detecting the outside air temperature taken into the heat source unit 110, a sensor for detecting the temperature of the air sucked into or blown into the indoor side heat exchanger 211, A sensor or the like for detecting the temperature of water stored in a hot water storage tank (not shown) may be provided. Information (measurement information such as temperature information and pressure information) detected by these various sensors is sent to the control means 120 via the communication means 400 and used for controlling each actuator.

Here, the refrigerant that can be used in the air-conditioning and hot water supply complex system 100 will be described. Examples of the refrigerant that can be used in the refrigeration cycle of the air conditioning and hot water supply complex system 100 include a non-azeotropic refrigerant mixture, a pseudo-azeotropic refrigerant mixture, and a single refrigerant. Non-azeotropic refrigerant mixture includes R407C (R32 / R125 / R134a) which is an HFC (hydrofluorocarbon) refrigerant. Since this non-azeotropic refrigerant mixture is a mixture of refrigerants having different boiling points, it has a characteristic that the composition ratio of the liquid-phase refrigerant and the gas-phase refrigerant is different. The pseudo azeotropic refrigerant mixture includes R410A (R32 / R125), R404A (R125 / R143a / R134a), which are HFC refrigerants, and the like. This pseudo azeotrope refrigerant has the same characteristic as that of the non-azeotrope refrigerant and has an operating pressure of about 1.6 times that of R22.

Further, the single refrigerant includes R22 which is an HCFC (hydrochlorofluorocarbon) refrigerant, R134a which is an HFC refrigerant, and the like. Since this single refrigerant is not a mixture, it has the property of being easy to handle. In addition, carbon dioxide, propane, isobutane, ammonia, etc., which are natural refrigerants, can also be used. R22 represents chlorodifluoromethane, R32 represents difluoromethane, R125 represents pentafluoromethane, R134a represents 1,1,1,2-tetrafluoromethane, and R143a represents 1,1,1-trifluoroethane. ing. Therefore, it is good to use the refrigerant | coolant according to the use and purpose of the air-conditioning / hot-water supply complex system 100.

When the water pipe 11 is frozen in an environment where the water circuit 10 of the refrigerant-water heat exchanger 311 has a low water temperature, an antifreezing agent (brine) may be added to the water. The type of antifreeze is not particularly limited, and may be selected according to availability and use, such as ethylene glycol and propylene glycol.

(Explanation of control operation in operation mode)
The operation performed in the air conditioning and hot water supply complex system 100 includes a heating (heating) operation and a cooling (cooling) operation. Both operations will be described below. In the heating (heating) operation, the flow path switching valve 112 is switched to the dotted line side in FIG. 1, and in the cooling (cooling) operation, the flow path switching valve 112 is switched to the solid line side in FIG.

Note that the air conditioning and hot water supply combined system 100 is a system in which the hot water supply unit 310 and the indoor unit 210 are designed with one refrigerant system. In this type of system, a high temperature and high pressure refrigerant from the compressor 111 is supplied to the hot water supply unit 310 side to boil water in a storage tank (not shown) of the hot water supply unit 310, and a high temperature from the compressor 111. Usually, the high-pressure refrigerant is switched to one of the heating operation (air-conditioning operation) in which the high-pressure refrigerant is supplied to the indoor unit 210 and hot air is supplied indoors. For example, a heating operation (boiling operation) is performed at midnight or a considerable 1 to 2 hours, and an air-conditioning operation is performed from morning to midnight (an image of boiling hot water stored in a tank and used for one day). In addition, the air-conditioning hot-water supply complex system 100 of the first embodiment can also perform simultaneous operation in which both the hot-water supply operation and the heating operation are performed.

Hereinafter, first, the operation in the case of performing the heating operation (or heating operation) will be described, and then the operation in the case of the simultaneous operation will be described. Thereafter, the cooling operation (or cooling operation) will be described.

(Heating operation (or heating operation))
The high-pressure gas refrigerant heated and compressed by the compressor 111 is conveyed to the indoor unit 210 (or the hot water supply unit 310) via the flow path switching valve 112, the gas main pipe 2, and the gas branch pipe 3. The refrigerant transferred to the indoor unit 210 (or hot water supply unit 310) is condensed by releasing heat to the indoor air (or water of the water circuit 10) in the indoor heat exchanger 211 or the refrigerant-water heat exchanger 311. The action changes to a high-pressure liquid refrigerant. The high-pressure liquid refrigerant changes into a low-pressure two-phase refrigerant (a refrigerant mixed with liquid and gas) by an expansion action in the indoor expansion device 212 (or the hot water supply-side expansion device 312) on the secondary side of the heat exchanger. .

The low-pressure two-phase refrigerant is changed into a low-pressure gas refrigerant by transferring heat from the air through the liquid branch pipe 4 and the liquid main pipe 1 in the heat source side heat exchanger 113 in the heat source unit 110. The low-pressure gas refrigerant passes through the flow path switching valve 112 and the accumulator 115, is sucked in by the compressor 111, and changes to a high-pressure gas refrigerant. Through the above-described cycle, the air conditioning and hot water supply combined system 100 can perform a heating (hot water supply) operation.

In the case of simultaneous operation, the refrigerant that has passed through the gas main pipe 2 is divided into each of the

gas branch pipes

3a and 3b, and each refrigerant is divided into the indoor heat exchanger 211 and the indoor expansion device 212 of the indoor unit 210, and the hot water supply unit. 310 passes through the refrigerant-water heat exchanger 311 and the hot water supply side expansion device 312 respectively, and flows into the

liquid branch pipes

4a and 4b. The refrigerants flowing into the

liquid branch pipes

4a and 4b join the liquid main pipe 1 and then flow toward the heat source side heat exchanger 113.

(Cooling operation (or cooling operation))
The high-pressure gas refrigerant heated and compressed by the compressor 111 passes through the flow path switching valve 112 and is conveyed to the heat source side heat exchanger 113 in the heat source unit. In the heat source side heat exchanger 113, by releasing heat to the air, the high-pressure gas refrigerant is condensed and changed into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is conveyed to the indoor unit 210 (or the hot water supply unit 310) through the liquid main pipe 1 and the liquid branch pipe 4.

In the indoor unit 210 (or the hot water supply unit 310), the high-pressure liquid refrigerant is expanded by the indoor side expansion device 212 (or the hot water supply side expansion device 312), and the low-pressure two-phase refrigerant (the refrigerant mixed with gas and liquid). In the indoor heat exchanger 211 (or refrigerant-water heat exchanger 311), the heat is transferred from the load to the low pressure gas refrigerant (the load side is deprived of heat). Cooled). The low-pressure gas refrigerant exiting the indoor unit 210 (or the hot water supply unit 310) returns to the heat source unit 110 via the gas branch pipe 3 and the gas main pipe 2. The low-pressure gas refrigerant that has flowed into the heat source unit 110 passes through the flow path switching valve 112 and the accumulator 115, is sucked in by the compressor 111, and changes to a high-pressure gas refrigerant. With the above-described cycle, the air conditioning and hot water supply combined system 100 can perform a cooling (cooling) operation.

Further, in the heat pump capable of cooling (cooling) and heating (heating) operation, the refrigerant is stored in the accumulator 115 because the refrigerant is left in the heating operation.

(Explanation regarding FIG. 2: Heating operation of hot water supply unit)
As described above, in the single refrigerant system air-conditioning and hot-water supply combined system 100, it is premised that the heating operation and the air-conditioning operation are switched. However, the heating operation of the indoor unit 210 is simultaneously performed during the heating operation of the hot-water supply unit 310. (For example, in a system in which a tank for storing hot water (not shown) is connected to the water circuit 10 of the hot water supply unit, the tank is reheated after the hot water is used during the day.) Case). In the building multi-air conditioner (VRF), the target condensation temperature is determined so that the heating capacity can be exhibited in all the indoor units 210 connected to the heat source unit 110, and the refrigerant condensation temperatures of the indoor unit 210 and the hot water supply unit 310 are determined. Is controlled to be constant at the target condensation temperature. Therefore, when performing the heating operation and the heating operation at the same time, it is also important to maintain the refrigerant condensing temperature. If it is attempted to keep the refrigerant condensing temperature constant at the target condensing temperature, the inlet water temperature of the hot water supply unit 310 and the hot water supplying unit 310 are maintained. The relationship with the degree of supercooling is as shown in FIG.

FIG. 2 is a diagram showing the relationship between the degree of supercooling of the hot water supply unit of FIG. 1 and the inlet water temperature of the hot water supply unit.
The degree of supercooling (hereinafter referred to as SC_H) of the hot water supply unit 310 can be expressed by the following equation.
SC_H = CT_H-TRL_H
here,
CT_H: Refrigerant condensation temperature TRL_H: Refrigerant-water heat exchanger 311 outlet refrigerant liquid tube temperature

Since the refrigerant-water heat exchanger 311 is more efficient in heat transfer than the refrigerant-air heat exchanger, the refrigerant liquid tube temperature TRL_H becomes a value almost close to the water temperature in the refrigerant-water heat exchanger 311.

That is, when the refrigerant condensing temperature of the hot water supply unit 310 is kept constant at the target condensing temperature, if the inlet water temperature of the hot water supply unit 310 is a low water temperature (for example, 25 ° C. to 35 ° C.), the degree of supercooling (SC_H) As shown in FIG. 2, it is necessary to set the target value of 1 to a considerably large value. Therefore, the hot-water supply side expansion device 312 in the hot-water supply unit 310 performs a considerably squeezed operation in an attempt to achieve the target value of the degree of supercooling. Then, since the gas refrigerant does not flow to the hot water supply unit 310, the ability cannot be exhibited even though the hot water supply unit 310 is in the heating operation.

In view of such a problem, in the first embodiment, air conditioning control in the indoor unit 210 is a technique for avoiding a situation where the hot water supply unit 310 cannot perform its ability during simultaneous operation in which heating operation is performed simultaneously with heating operation. In addition, a “hot-water temperature priority mode” in which priority is given to the performance of the hot water supply unit 310 is provided. In addition, in the simultaneous operation, in addition to the “hot water temperature priority mode”, there is a “continuation mode” which is the same control as the conventional one.

(Explanation regarding FIG. 3)
FIG. 3 is a diagram showing control outlines of the hot water temperature priority mode and the continuation mode in the combined air-conditioning and hot water system according to Embodiment 1 of the present invention.
As described above, the combined air conditioning and hot water supply system 100 has the “hot water temperature priority mode” and the “continuation mode”, which is the same control as in the past, as the control mode in the heating operation (or heating operation). The “hot water temperature priority mode” and the “continuation mode” have different control methods for the hot water supply side expansion device 312 of the hot water supply unit 310. Each mode will be described below.

(1) "Tapping temperature priority mode"
(A) The hot water supply unit 310 performs its own capacity control regardless of the refrigerant condensation temperature, and does not control the degree of supercooling. The self capability control is control for controlling the hot water supply side throttle device 312 based on the required capability required for the hot water supply unit 310, and controls the hot water supply side throttle device 312 so that the hot water temperature becomes the target hot water temperature. Control. Specifically, the hot water supply side expansion device 312 is controlled in accordance with the temperature difference between the hot water temperature detected by the outlet water temperature detection sensor 10b and the target hot water temperature, and the hot water supply side expansion device increases as the temperature difference increases. The opening value of 312 is determined to be a large value.

In addition, as described above, the “hot water temperature priority mode” is a control that prioritizes the hot water supply capacity on the hot water supply unit 310 side, and does not control the degree of supercooling, so the refrigerant condensing temperature of the air-conditioning hot water supply combined system 100 becomes a matter of course. . Here, in the “hot water temperature priority mode”, when the outlet water temperature is in a low water temperature range, that is, when the load on the hot water supply unit 310 is high, a large amount of refrigerant is supplied to the refrigerant-water heat exchanger 311. The side diaphragm device 312 is opened. However, since a large amount of refrigerant flows from the refrigerant-water heat exchanger 311 to the low pressure side of the refrigerant circuit, the high pressure does not increase (the refrigerant condensation temperature does not increase). That is, in the “hot water temperature priority mode”, the refrigerant condensation temperature does not rise to the target condensation temperature.

For this reason, when the heating operation of the indoor unit 210 is permitted in the “hot water temperature priority mode”, cold air is blown out from the indoor unit 210, giving the user a feeling of cold air. Therefore, in the “hot water temperature priority mode”, the operation unit is restricted on the indoor unit 210 side. Specifically, the indoor side expansion device 212 is closed, and a blower (not shown) that blows air to the indoor side heat exchanger 211 is stopped. That is, in the “hot water temperature priority mode”, simultaneous operation is not permitted, and only heating operation is performed.

(B) "Water sampling heat defrosting operation": Only high water temperature is permitted.
The “water sampling heat defrosting operation” will be described with reference to the flowchart of FIG.

(2) “Continuous mode”
(A) It is a control operation as described above and is a mode in which simultaneous operation is continued. That is, in the “continuation mode”, the compressor 111 is controlled so that the condensing temperature becomes the target condensing temperature, and the subcooling degrees of the hot water supply unit 310 and the indoor unit 210 are respectively set to the corresponding target subcooling degrees. In this mode, the hot water supply side expansion device 312 and the indoor side expansion device 212 are individually controlled.

(B) “Water sampling heat defrosting operation”: Permitted.
The “water sampling heat defrosting operation” will be described with reference to the flowchart of FIG.

FIG. 4 is an explanatory diagram of control mode switching in the combined air-conditioning and hot water supply system according to Embodiment 1 of the present invention.
In the air-conditioning and hot water supply combined system 100, two modes of the “hot water temperature priority mode” and the “continuation mode” are switched based on the inlet water temperature detected by the inlet water temperature detection sensor 10a. That is, during operation in the “hot water temperature priority mode”, when the inlet water temperature detected by the inlet water temperature detection sensor 10a becomes higher than the preset mode switching threshold A and the inlet water temperature is no longer in the low water temperature range, To "". Further, during operation in the “continuation mode”, if the inlet water temperature detected by the inlet water temperature detection sensor 10a is higher than the preset mode switching threshold A and lower than the mode switching threshold B (> A), the “continuation mode” is set. continue. On the other hand, if the inlet water temperature detected by the inlet water temperature detection sensor 10a is equal to or lower than the mode switching threshold A, that is, if the outlet water temperature is in the low water temperature range, during operation in the “continuation mode”, the mode is switched to the “hot water temperature priority mode”.

FIG. 5 is a diagram showing an example of mode switching thresholds A and B for switching between the hot water temperature priority mode and the continuous mode in the combined air-conditioning and hot water supply system according to Embodiment 1 of the present invention.
The mode switching thresholds A and B can be manually changed by, for example, a hot water supply unit installation switch (DipSW). In other words, in setting 1 (default), the mode switching threshold A is set to 30 ° C. and the mode switching threshold B is set to 35 ° C. However, by changing DipSW to setting 2, the mode switching threshold A is set to 35 ° C. The switching threshold B can be changed to 40 ° C. Note that although manual switching has been described in this specification, it may be switched by a control signal from an external communication device.

By making it possible to change the mode switching thresholds A and B in this way, the control mode can be switched flexibly according to the application at the site. For example, if the inlet water temperature is up to 40 ° C., if you want to activate the “hot water temperature priority mode”, change the DipSW setting from default to setting 3 to change the ratio of the “hot water temperature priority mode” to “continue” It is possible to increase compared to “mode”. In FIG. 5, the threshold value can be changed in units of 5 ° C. so that the local service person or the installation contractor can finely set the local use. However, this “5 ° C.” is an example. It is not limited to temperature.

(Control mode judgment)
The control mode determination according to the first embodiment will be described with reference to flowcharts shown in FIGS. Note that FIG. 6 and FIG. 7 are separate logics, and the control may be arbitrarily changed according to the form and application of the unit.

(Flowchart shown in FIG. 6)
FIG. 6 is a flowchart of control mode determination of the combined air-conditioning and hot water system according to Embodiment 1 of the present invention.
The control means 320 of the hot water supply unit 310 sets the control mode to the “hot water temperature priority mode” as an initial setting (S1) when the start of the heating operation is instructed or when the hot water temperature is lower than the target hot water temperature and the thermo is turned on. . Here, the initial setting is set to the “hot water temperature priority mode”, but it may be set to the “continuation mode”. Then, the control unit 320 checks the setting of DipSW and confirms the mode switching thresholds A and B (S2). Thereafter, mode determination processing (S3, S4) is performed.

In the mode determination process, first, it is determined whether or not the inlet water temperature detected by the inlet water temperature detection sensor 10a is equal to or higher than the mode switching threshold B (S3). If the inlet water temperature is equal to or higher than the mode switching threshold B, the mode is switched to “continuation mode” (S5). If the inlet water temperature is lower than the mode switching threshold B, it is subsequently determined whether the inlet water temperature is equal to or lower than the mode switching threshold A ( S4). If the inlet water temperature is equal to or lower than the mode switching threshold A (that is, if the inlet water temperature is in the low water temperature range), the “hot water temperature priority mode” is maintained (S6), and if the inlet water temperature is higher than the mode switching threshold A, the current The mode is maintained (S7). Here, since the “hot water temperature priority mode” is set as the initial setting, the “hot water temperature priority mode” remains unchanged.

Then, the control unit 320 determines whether the hot water supply unit 310 has been turned off or an instruction to stop the operation of the hot water supply unit 310 is made (S8). If neither is satisfied, the process returns to step S3. The processes from step S3 to step S7 are sequentially performed at arbitrarily set control time intervals until the hot water supply unit 310 is thermo-OFF or the operation stop of the hot water supply unit 310 is instructed.

Here, a specific example will be described. When the inlet water temperature detected by the inlet water temperature detection sensor 10a is equal to or lower than the mode switching threshold A, the “hot water temperature priority mode” is executed. Since the inlet water temperature is a temperature that depends on the temperature environment of the outside air and is not a temperature that changes due to the operation of the hot water supply unit 310, once it is determined in step S4 that the inlet water temperature is equal to or lower than the mode switching threshold A, usually, for a while During this time, the “hot water temperature priority mode” is continuously performed. Thereby, the hot water temperature detected by the outlet water temperature detection sensor 10b gradually increases toward the target hot water temperature. Then, when the hot water temperature reaches the target hot water temperature and the hot water supply unit 310 is thermo-OFF, the control in FIG. 6 is terminated.

(Flowchart shown in FIG. 7)
In FIG. 6 described above, the air-conditioning and hot-water supply complex system determines switching between the “hot water temperature priority mode” and the “continuation mode”, but in FIG. 7, this determination is performed by an external communication device. .

FIG. 7 is a flowchart of control mode determination of the combined air-conditioning and hot-water supply system according to Embodiment 1 of the present invention.
The control means 320 of the hot water supply unit 310 sets the control mode to the “hot water temperature priority mode” as an initial setting when the start of the heating operation is instructed or when the hot water temperature is lower than the target hot water temperature and the thermostat is turned on (S11). . Here, the “hot water temperature priority mode” is set, but the “continuous mode” may be set. And the control means 320 implements confirmation (S12) whether the mode change signal is received. The mode change signal is a signal transmitted from an external communication device outside the air conditioning and hot water supply complex system 100. Specifically, the external communication device is, for example, a monitoring device that monitors the operation state of the air conditioning and hot water supply complex system 100.

Then, when receiving the mode change signal, the control means 320 determines the mode change content (S13). If the received mode change signal instructs the “hot water temperature priority mode”, the control means 320 performs the “hot water temperature priority mode” (S14), and if it instructs the “continuation mode”, The “continuation mode” is executed (S15). On the other hand, when it is determined in step S12 that the mode change signal has not been received, the control means 320 maintains the current mode (S16).

Then, the control means 320 determines whether the hot water supply unit 310 is thermo-off or has been instructed to stop the operation of the hot water supply unit 310 (S17), and if neither is satisfied, the process returns to step S12. The processes from step S12 to step S16 are sequentially performed at arbitrarily set control time intervals until the hot water supply unit 310 is thermo-OFF or the operation stop of the hot water supply unit 310 is instructed.

It should be noted that the external communication device outside the air conditioning and hot water supply combined system 100 is connected to the inlet water temperature detection sensor 10a or the control means 320 so that the detection signal of the inlet water temperature detection sensor 10a can be received. Then, when the inlet water temperature detected by the inlet water temperature detection sensor 10a is equal to or lower than the mode switching threshold A, the external communication device transmits a mode change signal instructing the “hot water temperature priority mode” to the hot water supply unit 310. Further, when the inlet water temperature detected by the inlet water temperature detection sensor 10 a is equal to or higher than the mode switching threshold B, the external communication device transmits a mode change signal instructing “continuation mode” to the hot water supply unit 310.

(Control operation flowchart)
Below, the control operation | movement flowchart of the air-conditioning hot-water supply complex system which concerns on this invention is demonstrated. Here, the control performed by the air conditioning and hot water supply complex system 100 is shown in FIG. 8 (control of the hot water supply side throttle device 312 of the hot water supply unit 310), FIG. 9 (inhibition of the operation of the indoor unit 210), and FIG. The use of the heat collection defrosting operation) is divided into three, and each process operates simultaneously. Further, the processes of the flowcharts of FIGS. 8 to 10 are performed at each control time interval.

(Control operation flowchart of hot water supply side throttle device 312)
FIG. 8 is a flowchart of the control operation of the hot water supply side throttle device in the combined air conditioning and hot water supply system according to Embodiment 1 of the present invention.
The control means 320 of the hot water supply unit 310 performs a process (S21) for confirming the currently set control mode. If the currently set control mode is the “hot water temperature priority mode”, the hot water supply unit 310 subsequently checks the outlet water temperature (hot water temperature) detected by the outlet water temperature detection sensor 10b (S22), and sets the target hot water temperature. Confirmation (S23) is performed. Then, the hot water supply unit 310 determines the opening value of the hot water supply side expansion device 312 according to the temperature difference between the target hot water temperature and the hot water temperature, and controls the hot water supply side expansion device 312 so as to be the opening value (S24). ) Specifically, as described above, as the water temperature difference between the target hot water temperature and the hot water temperature is larger, the opening degree value of the hot water supply side expansion device 312 is determined to be a larger value, and the amount of refrigerant flowing into the refrigerant-water heat exchanger 311 is determined. Thus, the control for increasing the capacity of the hot water supply unit 310 is performed.

On the other hand, if the currently set control mode is “continuation mode” in step S21, the hot water supply unit 310 subsequently checks the degree of supercooling (S25) and the target degree of supercooling (S26). Then, the hot water supply unit 310 determines the opening value of the hot water supply side expansion device 312 according to the difference between the target supercooling degree and the subcooling degree, and controls the hot water supply side expansion device 312 so as to be the opening value (S27). )

(Operation prohibition processing of indoor unit 210)
FIG. 9 is a control operation flowchart regarding the operation prohibition process of the indoor unit in the air conditioning and hot water supply complex system according to Embodiment 1 of the present invention.
The control means 320 of the hot water supply unit 310 performs processing (S31) for checking the currently set control mode. If the currently set control mode is the “hot water temperature priority mode”, the hot water supply unit 310 performs a process of imposing a restriction on prohibition of operation on the indoor unit 210 (S32). Specifically, as described above, the indoor expansion device 212 is closed, and the blower (not shown) that blows air to the indoor heat exchanger 211 is stopped.

On the other hand, if the currently set control mode is the “continuation mode”, the hot water supply unit 310 performs a process (S33) for releasing the restriction on prohibition of operation for the indoor unit 210.

In addition, although the hot water supply unit 310 has shown the form which imposes restrictions of a driving | running prohibition with respect to the indoor unit 210 in the above, you may make it as follows. That is, in the control system configuration, if the heat source unit 110 is a system responsible for the operation restriction of the indoor unit 210, the control means 120 of the heat source unit 110 is operated from the control means 320 of the hot water supply unit 310 to the operation restriction information of the indoor unit 210 (for example, The operation mode of the hot water supply unit 310 = information of the hot water temperature priority mode) may be received, and the heat source unit 110 may implement the operation restriction of the indoor unit 210 based on the operation restriction information. Further, the communication means at that time may be implemented by the control means (120, 220, 320) possessed by each unit and the communication means 400.

(Use of water sampling heat defrosting operation during defrosting operation)
In the air conditioning and hot water supply complex system 100, a defrosting operation for melting and removing frost attached to the heat source side heat exchanger 113 is performed at an appropriate timing during the heating operation. Here, first, the defrosting operation will be described, and then the availability of the water sampling heat defrosting operation during the defrosting operation will be described.

In the defrosting operation, the refrigerant flows in the order of the compressor 111 → the flow path switching valve 112 → the heat source side heat exchanger 113 → the liquid main pipe 1 → the liquid branch pipe 4a and the liquid branch pipe 4b → the indoor unit 210 and the hot water supply unit 310. Then, the refrigerant that has passed through the

gas branch pipes

3 a and 3 b flows from the gas main pipe 2 → the flow path switching valve 112 → the accumulator 115 → the compressor 111.

Here, in the indoor unit 210, the refrigerant passes through the indoor expansion device 212 → the indoor heat exchanger 211 and flows to the gas branch pipe 3a. On the other hand, in hot water supply unit 310, the defrosting operation is classified into “standard defrosting operation” and “water sampling heat defrosting operation”.

The “standard defrosting operation” is an operation for melting the frost formed on the heat source side heat exchanger 113 with only the heat amount (work amount) of the compressor 111, and the refrigerant in the hot water supply unit 310 in the “standard defrosting operation”. The flow is as follows. That is, in the “standard defrosting operation”, the refrigerant flows from the bypass pipe 314 to the bypass valve 315 to the gas branch pipe 3b.

On the other hand, the “water sampling heat defrosting operation” uses the heat transferred from the water flowing through the water circuit 10 in the water heat exchanger 311 in addition to the amount of heat (work amount) of the compressor 111, and heat source side heat exchange. The refrigerant flow in the hot water supply unit 310 in the “water sampling defrosting operation” is as follows. That is, the refrigerant in the “water sampling heat defrosting operation” passes through the hot water supply side expansion device 312 → the refrigerant-water heat exchanger 311 and flows to the gas branch pipe 3b.

When it is determined that the defrosting operation is necessary during the heating operation, the air conditioning and hot water supply combined system 100 switches the flow path switching valve 112 to the solid line side in FIG. It is determined whether the operation is “operation” or “water sampling / defrosting operation”. Then, the bypass valve 315 is controlled such that the determined operation is performed.

The “water sampling heat defrosting operation” has higher defrosting efficiency than the “standard defrosting operation” because the heat received from the water flowing on the water circuit 10 side is also used for defrosting. However, if the “water sampling heat defrosting operation” is always performed, when the “water sampling heat defrosting operation” is performed at a low water temperature, the refrigerant-water heat exchanger 311 performs hydrothermal freezing freeze (specifically, In other words, the water in the water circuit of the refrigerant-water heat exchanger 311 freezes and expands in volume, which causes excessive stress on the inside of the refrigerant-water heat exchanger 311 and leads to breakage). is there. Therefore, the control means 320 of the hot water supply unit 310 determines whether or not the “water sampling heat defrosting operation” is permitted based on the current operation state, and when it determines that the “water sampling heat defrosting operation” is permitted, When the “heat extraction defrosting operation” is performed and it is determined that the “water extraction heat defrosting operation” is not permitted, the “standard defrosting operation” is performed.

FIG. 10 is a control operation flowchart in the water sampling / defrosting operation availability in the combined air conditioning and hot water supply system according to Embodiment 1 of the present invention.
The control means 320 of the hot water supply unit 310 performs processing (S41) for confirming the currently set control mode. If the currently set control mode is the “hot water temperature priority mode”, the hot water supply unit 310 subsequently has an inlet water temperature detected by the inlet water temperature detection sensor 10a greater than or equal to a preset water sampling defrost setting value. A process of determining whether or not there is (S42).

When the hot water supply unit 310 determines that the inlet water temperature is equal to or higher than the water sampling heat defrosting set value, it determines that the “water sampling heat defrosting operation” is permitted, and performs the “water sampling heat defrosting operation” (S43). Specifically, the hot water supply unit 310 closes the bypass valve 315 so that the refrigerant flows into the refrigerant-water heat exchanger 311. In addition, when it is determined in step S41 that the currently set control mode is the “continuation mode”, the “water sampling heat defrosting operation” is similarly performed (S43).

On the other hand, if it is determined in step S42 that the inlet water temperature is less than the water sampling heat defrosting set value, the hot water supply unit 310 determines that the “water sampling heat defrosting operation” is not permitted and performs the “standard defrosting operation”. Implement (S44). Specifically, the hot water supply unit 310 opens the bypass valve 315 so that the refrigerant flows through the bypass pipe 314.

As described above, in the first embodiment, the control mode during the simultaneous operation controls the hot water supply side expansion device 312 for the purpose of securing the hot water temperature of the hot water supply unit 310, and the hot water that prohibits the operation of the indoor unit 210. The temperature priority mode and the continuous mode in which the simultaneous operation is continued are switched according to the inlet water temperature of the hot water supply unit 310. For this reason, the operation according to the inlet water temperature of the hot water supply unit 310 is possible, the decrease in the hot water temperature when the inlet water temperature is in the low water temperature range can be suppressed, and the operation without causing the user to feel the cold air in the room is possible. Become.

By the way, as a general theory, in the European market, there is very little thought of cooling and heating with a single air conditioner (for example, an indoor unit). Cooling and radiator in an indoor unit (heating is performed with hot water conveyed from a hot water supply unit) The role is shared by each device such as heating. Therefore, it is very rare to simultaneously perform the heating operation of the indoor unit and the heating operation of the hot water supply unit.

Because of such a background, when the roles are divided for each device, the operation restriction of the indoor unit 210 in the “hot water temperature priority mode” does not become a problem by introducing the present invention. In other words, when the air conditioning and hot water supply complex system 100 is operating in the “hot water temperature priority mode”, the indoor heating is performed not by the indoor unit 210 but by a water-air heat exchanger (not shown) provided in the water circuit 10. Can be heated with warm water and heated. Therefore, the operation restriction of the indoor unit 210 in the “hot water temperature priority mode” does not become a problem, and the protection function as the air conditioning and hot water supply complex system 100 can be exhibited correctly.

In the above description, the control unit 320 of the hot water supply unit 310 operates in a self-distributed manner. However, the control unit 120 of the heat source unit 110 acquires necessary information via the communication unit 400, and the hot water supply unit 310 may be controlled. That is, the processing of the flowcharts shown in FIGS. 7 to 10 may be performed on the control means 120 side.

Further, when determining whether to select the control mode of “hot water temperature priority mode” or “continuation mode”, if the heat source capacity is extremely larger than the capacity of the hot water supply unit 310, the connected hot water supply unit 310 Capacity may also be added to the criteria. For example, if “inlet water temperature ≧ B or the capacity ratio between the heat source unit 110 and the hot water supply unit 310 is larger than an arbitrarily determined value” in S3 of FIG. 6, the continuation mode (S5) is determined. Also good.

1 liquid main pipe, 2 gas main pipe, 3 (3a, 3b) gas branch pipe, 4 (4a, 4b) liquid branch pipe, 10 water circuit, 10a inlet water temperature detection sensor, 10b outlet water temperature detection sensor, 11 (11a, 11b) Water piping, 100 Air-conditioning hot-water supply complex system, 110 Heat source unit, 111 compressor, 112 Channel switching valve, 113 Heat source side heat exchanger, 114 Blower, 115 Accumulator, 120 Control means, 210 Indoor unit, 211 Indoor heat exchange 212, indoor throttle device, 213G gas pipe temperature detection sensor, 213L liquid pipe temperature detection sensor, 220 control means, 310 hot water supply unit, 311 refrigerant-water heat exchanger, 312 hot water supply side throttle device, 313G gas pipe temperature detection sensor 313L Liquid tube temperature detection sensor, 314 Viper Tube, 315 bypass valve, 320 control unit, 400 communication unit.

Claims

At least one heat source unit on which a compressor and a heat source side heat exchanger are mounted, at least one indoor unit on which an indoor side heat exchanger and an indoor expansion device are mounted, a hot water supply side heat exchanger and a hot water supply side A refrigerant circuit that is connected to at least one hot water supply unit on which an expansion device is mounted, and that performs the heating operation in which the indoor heat exchanger functions as a condenser or a radiator, the refrigerant of the refrigerant circuit, and the hot water supply side An air conditioning and hot water supply combined system including a hot water supply circuit that performs at least a heating operation of heating the heat medium by exchanging heat with a heat exchanger,
As a control mode during simultaneous operation in which both the heating operation and the heating operation are performed, the hot water temperature is controlled while controlling the hot water supply side expansion device based on the required capacity of the hot water supply unit and prohibiting the heating operation of the indoor unit. Comprising control means having a priority mode and a continuation mode for continuing the simultaneous operation;
The control means switches the control mode during the simultaneous operation to the hot water temperature priority mode or the continuous mode according to the inlet temperature of the heat medium in the hot water supply side heat exchanger. system.
When the control means receives a mode change signal for instructing the change of the control mode according to the inlet temperature of the heat medium in the hot water supply side heat exchanger, the control mode is indicated by the mode change signal. The air-conditioning and hot-water supply complex system according to claim 1, wherein the system is switched to the selected mode.
The control means controls the hot water supply side squeezing device so that an inlet temperature of the heat medium in the hot water supply side heat exchanger becomes a target hot water temperature in the hot water temperature priority mode. The combined air conditioning and hot water supply system according to claim 2.
The said control means enlarges the opening degree of the said hot water supply side expansion device, so that the temperature difference of the inlet temperature of the said heat medium in the said hot water supply side heat exchanger and the said target hot water temperature is large. The air conditioning and hot water supply combined system described.
In the continuation mode, the control means separately sets the indoor-side throttling device and the hot-water supply-side throttling device so that the degree of subcooling becomes the corresponding target subcooling degree in each of the indoor unit and the hot water supply unit. The combined air-conditioning and hot-water supply system according to any one of claims 1 to 4, wherein
A flow path switching valve that enables a defrosting operation for switching the flow direction of the refrigerant and flowing the refrigerant discharged from the compressor to the heat source side heat exchanger and removing frost attached to the heat source side heat exchanger. In addition,
The control means, as the defrosting operation, in addition to the heat of the refrigerant discharged from the compressor, in addition to the heat transferred from the heat medium of the hot water supply unit, the heat medium defrosting operation that performs defrosting And a standard defrosting operation in which the heat transferred from the heat medium of the hot water supply unit is not used, and defrosting is performed with the heat of the refrigerant discharged from the compressor,
When the defrosting operation is performed during the heating operation, the flow path switching valve is switched, and if the current control mode is the hot water temperature priority mode, whether the heat medium heat defrosting operation is possible or not is determined. Judgment is made based on the inlet temperature of the heat medium in the side heat exchanger, and the heat source heat defrosting operation or the standard defrosting operation is selected according to the determination result to defrost the heat source side heat exchanger. 6. The combined air conditioning and hot water supply system according to any one of claims 1 to 5, wherein
When the inlet temperature of the heat medium in the hot water supply side heat exchanger is equal to or higher than a preset set value, the control means determines that the heat medium heat defrosting operation is permitted, and in the hot water supply side heat exchanger The combined air conditioning and hot water supply system according to claim 6, wherein when the inlet temperature of the heat medium is lower than the set value, it is determined that the heat medium heat defrosting operation is not permitted.
A bypass pipe for bypassing the hot water supply side expansion device and the hot water supply side heat exchanger;
A bypass valve for controlling the flow rate of the bypass pipe,
The air conditioning according to claim 6 or 7, wherein the control means performs control to close the bypass valve in the heat medium heat extraction defrosting operation and open the bypass valve in the standard defrosting operation. Hot water supply complex system.