JPS629132A - Heat pump for cooling and heating room space and supplying hot water - Google Patents

Abstract

PURPOSE:To make it possible to compensate for the temperature of the hot water supply from a faucet by providing a heater at the upper section of a hot-water storage tank and controlling it with two temperature sensors, one installed at its upper section and the other at its lower section and heating only the upper section of the hot-water storage tank and maintaining the quantity of accumulated heat at a fixed value. CONSTITUTION:The coolant from a compressor 1 which is of high temperature and under high pressure is led to the heating coil 8 in a hot-water storage tank to heat the water, and when the accumulated heat quantity is small and a high temperature is urgently needed, a heater 17 heats only the upper section of the hot water storage tank. The hot-water temperature T1 at the position of the heater 17 is detected by a temperature sensor 16 and the hot-water temperature T2 at the lower section is detected by a temperature sensor 18. A set temperature T1' is determined by a specified formula so that the quantity of heat accumulated in the hot-water storage tank 7 is fixed. When the hot water temperature T1 is lower than the set temperature T1;, the upper heater 17 of the hot-water storage tank 7 is turned on to heat the hot water above it and if T1 is higher than T1', the heater 17 is turned off. When the hot water of temperature T2 is heated by the heating coil at the lower section of the hot water storage tank 7, the set temperature for the temperature sensor 16 at the upper section is lowered by T1-alpha with the heat quantity Q of the accumulated heat being fixed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an air-conditioning/hot-water supply heat pump device that uses a heat pump to heat water in a hot-water storage tank.
This invention relates to an air conditioning/heating/hot water supply beat pump device that can compensate for a certain amount of heat storage.

[Conventional technology]

2. Description of the Related Art Conventionally, there is a heating and cooling system using a heat pump as shown in FIG. In the figure, 1 is a compressor, 2 is a four-way valve for switching between air conditioning and heating, 3a and 3b are indoor heat exchangers, and 4 is a reversible refrigerant expansion mechanism, with an expansion valve 4a corresponding to the flow direction during cooling and heating. . 4b. 5 is an outdoor heat exchanger, and 6a and 6b are four-way valves 2 of the indoor heat exchangers 3a and 3b.
This is a solenoid valve installed on the connection side. In the conventional 7-pump system configured as described above, when cooling multiple rooms, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as shown in the solid line arrow in the figure, as shown in Figure 5. It flows from the four-way valve 2 to the outdoor heat exchanger 5, where it is cooled and condensed. The condensed high-pressure liquid refrigerant is then depressurized by passing through the expansion valve 4a. At this time, the two-way solenoid valves 6a and 6 of the indoor heat exchangers 3a and 3b
b opens when each load is generated, so the expansion valve 4a
The low-pressure liquid refrigerant from the room evaporates in the indoor heat exchangers 3a and 3b, removes heat from the indoor air, and turns into gas. This low-pressure refrigerant gas is sucked into the compressor 1 through the four-way valve 2, and the cycle of being compressed again and discharged is repeated. In addition, during heating operation, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as shown by the broken line arrow in the figure and reaches the indoor heat exchangers 3a and 3b from the four-way valve 2, where it radiates heat. Heats the room by condensing. Further, the condensed high-pressure liquid refrigerant is depressurized by passing through the expansion valve 4b, and this low-pressure liquid refrigerant reaches the outdoor heat exchanger 5, where it is heated by outside air and evaporates. The evaporated low-pressure gas C passes through the four-way valve 2, is sucked into the compressor 1, is compressed again, and is discharged, repeating the cycle. (Source: Practical knowledge of air conditioning equipment, 1976 edition, p. 83) Figure 6 shows an example of a conventional air conditioning/heating/hot water beat pump device, and the same symbols as in Figure 5 indicate the same or equivalent parts. show. Further, 7 is a hot water storage tank, and a hot water storage tank heating coil 8 is provided inside the hot water storage tank, and this heating coil 8 is an electromagnetic ff-6.
It is connected in parallel to the series circuit of the indoor heat exchanger 3a and the electromagnetic valve 6a via b. 9 is the city water intake of hot water tank 7;
10 is a hot water faucet connected to the hot water storage tank 7 (Source: Refrigeration Vol. 58, No. 671). In the heat pump device configured as described above, when heating hot water, the solenoid valve 6a is closed and the solenoid valve 6b is closed.
open. As a result, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as indicated by the dashed arrow in Figure 5, passes from the four-way valve 2 through the electromagnetic valve 6b, and reaches the heating coil 8, where it radiates heat and condenses. This heats the water in the hot water tank 7. The condensed high-temperature, high-pressure liquid refrigerant is depressurized by passing through the expansion valve 4b, reaches the outdoor heat exchanger 5, is heated by the outside air, and evaporates. Then, this low-pressure gas passes through the four-way valve 2, is sucked into the compressor 1, and is compressed again, repeating the cycle to heat the hot water. Also, during heating operation, the solenoid valve 6a is open and solenoid valve 6b is closed, and during cooling operation, the solenoid valve 6b is open and the solenoid valve 6a is closed, so that the arrows shown by the broken line or solid line in FIG. Heating or cooling is performed by generating the flow of refrigerant shown in FIG. 5, and its operation is similar to that described in FIG.

[Problems to be solved by the invention]

As described above, when hot water is heated by a conventional heat pump device, one of the indoor heat exchangers 3a and 3b is replaced with a heating coil 8, and this heating coil 8 is connected to the hot water storage tank 7, as shown in FIG. Since the system heats the water in the hot water tank by heating the refrigerant circuit, it is not possible to perform economical operations such as recovering waste heat from cooling to heat hot water. Further, since the heating coil 8 is provided only in the lower part of the hot water storage tank 7a, the entire inside of the hot water storage tank 7a has to be heated at once, which causes problems such as a large heat radiation loss and a long time required to boil up the entire hot water tank. This invention was made to solve this problem, and aims to provide an economical heating/cooling/hot water supply heat pump device.

[Means to solve the problem]

The air conditioning and hot water supply heat pump device according to the present invention includes a switching valve on the discharge side of the compressor to guide high temperature and high pressure refrigerant discharged from the compressor to a heating coil in a hot water storage tank, thereby heating water and condensing the refrigerant. A circuit is formed to return the hot water to the compressor through an expansion valve and an indoor/outdoor heat exchanger, a heater is provided at the top of the hot water storage tank, and temperature sensors are installed at the top and bottom of the hot water storage tank.

[For production]

In this invention, high-temperature, high-pressure refrigerant from the pressure W181 is guided to a heating coil in a hot water storage tank, and the refrigerant that is condensed by heating the water in the hot water storage tank is returned to the compressor through an expansion valve and an indoor/outdoor heat converter. When the amount of stored heat is low and a high temperature is urgently required, the heater heats only the upper part of the hot water tank, and the set water temperature of the upper temperature sensor is determined from the water temperature detected by the temperature sensor at the bottom of the tank, and the heater is turned on. on/off control.

【Example】

EMBODIMENT OF THE INVENTION Hereinafter, the air conditioning/hot water supply heat pump apparatus of this invention will be explained based on drawings. FIG. 1 is a refrigerant circuit diagram showing the configuration of an embodiment of the present invention. Reference numerals 1 to 10 are the same as in FIGS. 5 and 6, and 11
is a three-way valve that switches the flow path of high-temperature, high-pressure refrigerant discharged from the compressor 1, and its inflow port 11g and one discharge port 11b are connected. Further, the discharge port 11C of the three-way valve 11 is connected to one end of the heating coil 8, and the other end of the heating coil 8 is connected to both ends of the expansion mechanism 4 via separate electromagnetic valves 12, 13. 14 is an inverter for controlling the capacity of the compressor 1; 15 is a control device for controlling the three-way valve 11, the solenoid valves 12, 13, and the inverter 14;
Detection signals from a temperature sensor 18 that detects the lower water temperature of the hot water tank 7 and a detector 16 that detects the upper water temperature of the hot water storage tank 7 are input, and are connected to the heater 17 . Next, the operation of the embodiment of the invention configured as described above will be explained. (a) [At the time of one chamber, the high temperature and high pressure refrigerant discharged from the compressor 1 is
The inflow port lla and the discharge port 11b of the four-way valve 2 pass through the broken line HR of the four-way valve 2 to one or both of the indoor heat exchangers 771933a and 3b, where it is condensed, then depressurized by the expansion mechanism 4, and then transferred to the outdoor It evaporates in the heat exchanger 5, and the evaporated refrigerant gas returns to the compressor 1 through the four-way valve 2. (b) During cooling, the refrigerant discharged from the compressor 1 at this time is the three-way valve 11,
Four-way valve 2 from inflow port lla and discharge port 11b
It reaches the outdoor heat exchanger 5 via the solid line B path, where it condenses by exchanging heat with the outside air, and is further depressurized by the expansion mechanism 4, and then flows into one or both of the indoor heat exchangers 3a and 3b. To 1, evaporate. This evaporated gas refrigerant returns to the compressor 1 via the four-way valve 2. (c) During cooling hot water supply In this case, the refrigerant discharged from the compressor 1 reaches the heating coil 8 from the inflow port 11a and the discharge port 11C of the three-way valve 11, where it is condensed, and as a result, the water in the hot water storage tank 7 heat up. and. The condensed liquid refrigerant passes through the electromagnetic valve 13 and reaches the expansion mechanism 4, where it is depressurized and then transferred to the indoor heat exchanger 3.
a and 3b, where it absorbs indoor heat and evaporates, and this gas refrigerant returns to the compressor 1 via the solid line of the four-way valve 2. In this way,
Hot water will be heated and cooled at the same time. (d) At the time of heating hot water, the refrigerant discharged from the compressor 1 passes through the three-way valve 11.
The water flows from the inlet port 11a and the discharge bow 1-11c to the hot water tank heating coil 8, where it condenses and heats the water in the hot water tank 7. The condensed liquid refrigerant then passes from the electromagnetic valve 12 through the expansion mechanism 4 to the outdoor heat exchanger 5, where it evaporates. The evaporated gas refrigerant returns to the compressor 1 via the four-way valve 2. In the device of this invention, temperature sensors 1 are installed at the upper and lower parts of the hot water storage tank.
B, has 18. The upper temperature sensor 16 detects the temperature of hot water in the upper part of the hot water storage tank 7 and whether or not the hot water exceeds a certain set amount, and the lower temperature sensor 18 detects the temperature of the hot water in the lower part. For example, when hot water is urgently needed and the hot water is not boiling, or during heating operation, heating is normally given priority, but for this reason, the heating coil 8 of the hot water storage tank 7 is not sufficiently heated. Naturally, the amount of heat storage decreases. Therefore, in the present invention, a case will be described in which a storage tank heating operation is performed by a heater in addition to heating by the heating coil 8 in order to ensure a certain amount of heat storage or more, with reference to the heater heating operation control flow shown in FIG. The program for the control procedure shown in FIG. 2 is stored in the internal memory of the control device 15. In FIG. 2, in step S1, the upper temperature sensor 16 detects the hot water temperature T1 at the heater 17 position, and the lower temperature sensor 18 detects the hot water temperature T2 at the lower part of the storage tank 7. Next, in step S2, the heat storage amount Q of the hot water storage tank 7 is determined from the set temperature of the upper temperature sensor 16 so as to be constant.
Here, Vl and V2 represent the amount of hot water above the heater position and the amount of hot water from the heater position to the bottom of the hot water tank 7, respectively, as shown in Fig. 3, and the respective hot water temperatures are assumed to be T t and T 2. . In step S3, it is determined whether or not the hot water temperature T1 detected by the upper temperature sensor 16 is lower than the set temperature T1'. The heater 17 is turned on and heats the hot water above the heater position with a hot water amount v1 and a hot water temperature T1, and if the temperature is higher than the set temperature T1', proceed to step S4b,
Heater 17 is turned off. As shown in FIG. 4, when hot water with a hot water volume v2 and a hot water temperature T2 is heated by the heating coil 8 installed at the bottom of the hot water storage tank 7, the hot water temperature rises to T 2 +a and the heat storage amount Q is kept constant. In this case, the set temperature of the upper temperature sensor 16 falls to T+'-a' (however, α≧0). In addition, the amount of hot water v1 above the position of the heater 17, the hot water temperature T
Since the heater 17 is turned on for hot water No. 1, the temperature of the hot water is T.
It increases to 1+β (however, β≧0). In the above embodiment, the indoor heat exchanger is 3a. Although the case where there are two units 3b has been described, this can be similarly applied to the case where there are three or more units. Further, instead of the three-way valve 11 as a switching valve, a combination of two two-way valves may be used, or the three-way valve 11 may be a solenoid valve capable of controlling flow rate and temperature.

【Effect of the invention】

As explained above, this invention has a tanabata in the upper part of the hot water storage tank, and the temperature is controlled by two temperature sensors installed at the upper and lower parts of the tank, so that only the upper part of the hot water tank is heated to high temperature. It has the advantage of being able to heat up, keep the amount of heat storage constant, and compensate for the temperature of hot water supplied from the faucet. In addition, a switching valve was installed to add high-temperature, high-pressure refrigerant discharged from the compressor to the heating coil, and the water in the closed container was heated and the condensed refrigerant was returned to the compressor through an indoor-outdoor heat exchanger, making cooling and heating possible. This makes it possible to recover waste heat from cooling, which can be used to heat and supply hot water at the same time.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the air conditioning/hot water supply heat pump device according to the present invention, Fig. 2 is a flowchart showing the operation flow of the air conditioning/hot water heat pump device according to the above, and Fig. 3 is a block diagram showing the operation flow of the air conditioning/hot water heat pump device same as above. Figure 4 is a diagram showing the relationship between hot water temperature and flow rate in the hot water storage tank, Figure 4 is a diagram showing changes in hot water temperature and set temperature in the same air conditioning/hot water heat pump system, and Figures 5 and 6 are for conventional air conditioning/heating equipment. FIG. 2 is a refrigerant circuit diagram showing the configuration of a heat pump device. 1 Compressor, 2... Four-way valve, 3a, 3b... Indoor heat exchanger, 4... Expansion mechanism, 5... Outdoor heat exchange equipment, 7
...Hot water tank, 8...Heating coil, 11...Three-way valve, 1
2゜13... Solenoid valve, 14... Inverter, 15...
-Control device, 16.18... Temperature sensor, 17... Heater. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In an air conditioning heat pump device in which a refrigerant circuit is configured by connecting a compressor whose capacity can be controlled by an inverter, a four-way air conditioning switching valve, an indoor heat exchanger, an expansion mechanism, and an outdoor heat exchanger in a closed loop, the compression A switching valve is provided between the four-way valve and the four-way valve to switch the refrigerant flow path discharged from the compressor, and a switching valve is connected between the discharge port of the switching valve and both ends of the expansion mechanism through a solenoid valve. A heat pump device for air conditioning and hot water supply, characterized in that it includes a heating coil that heats water, a heater provided to heat the upper part of the hot water storage tank, and temperature sensors provided at the upper and lower parts of the hot water storage tank. (2) The amount of heat storage is calculated based on the temperature of the water detected by the temperature sensor installed at the bottom of the hot water storage tank, or the temperature setting of the upper sensor is changed to compensate for the amount of heat storage above a certain value, and the heater is turned on. - The air conditioning/hot water supply heat pump device according to claim 1, further comprising a control device that turns off the heating/cooling/hot water supply heat pump device.