JPS62252857A - Heat pump type heating hot-water supply machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat pump type heating and water heater.

(Prior Art) As a conventional example of a heat pump type heating water heater, for example, Japanese Utility Model Publication No. 17641/1983 can be mentioned.
This device returns the refrigerant discharged from the compressor to the compressor via an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger in order, and also exchanges heat for hot water supply in parallel with the indoor heat exchanger. It has a structure in which containers are connected. In this device, heating is performed by condensing high-pressure gas refrigerant from the compressor in an indoor heat exchanger, and heating is performed by condensing high-pressure gas refrigerant from the compressor in a hot water supply heat exchanger. It is designed to heat water. In the above device, a pressure regulating valve is interposed on the liquid refrigerant outlet side of the hot water supply heat exchanger, so that the amount of refrigerant distributed to both the indoor heat exchanger and the hot water supply heat exchanger can be adjusted. This is due to the following reasons. In other words, when the water temperature in the hot water storage tank is low, the refrigerant condensation temperature in the hot water heat exchanger decreases, and most of the refrigerant is distributed to the hot water heat exchanger, resulting in indoor heat exchange. On the side of the refrigerant, the blowout temperature decreases due to a decrease in the amount of refrigerant distributed, causing discomfort to the user.
To prevent this, the pressure regulating valve apparently increases the condensing pressure to ensure the amount of refrigerant distributed to the indoor heat exchanger.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional heat pump type heating and water heater, no consideration is given to operation control.
In other words, heating and hot water supply must be operated simultaneously under any conditions, which has the following disadvantages. Even if the refrigerant distribution amount is adjusted using the pressure regulating valve as described above, when the heating load is large, such as immediately after heating starts, there will still be a lack of heating capacity.
This means that it causes discomfort to the user. In addition, as mentioned above, by apparently increasing the condensing pressure of the hot water heat exchanger with the pressure regulating valve, there is a drawback that the efficiency of the heat pump decreases by that amount. There is also the disadvantage that the structure of the device becomes complicated due to the use of . On the other hand, if the water temperature is high and the condensed refrigerant temperature on the hot water heat exchanger side is higher than the condensed refrigerant temperature on the indoor heat exchanger side, the condensed temperature of the refrigerant will be lower than the indoor heat exchanger for heating. This is determined by the hot water supply heat exchanger, and non-condensing refrigerant that does not exchange heat passes through the water supply heat exchanger, which not only prevents hot water from being heated (but also disturbs the refrigeration cycle and reduces efficiency). arise.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to enable simultaneous operation of heating and hot water supply with high efficiency while maintaining a comfortable heating condition. The objective is to provide a heat pump type heating and water heater.

(Means for Solving the Problems) Therefore, in the heat pump type heating and water heater of the present invention, the refrigerant discharged from the compressor 1 is passed through the indoor heat exchanger 19, the expansion mechanism I5, and the outdoor heat exchanger 10 in sequence. Compressor 1
In a heat pump heating water heater configured by connecting a hot water heat exchanger 23 in parallel to the indoor heat exchanger 19, as shown in FIG. heating load detection means 42 for detecting the heating load on the hot water supply heat exchanger 23 side; and hot water supply load detection means 30 for detecting the load on the hot water supply heat exchanger 23 side; When the value is greater than or equal to the value, heating and hot water supply are operated simultaneously (operation control means 43 for controlling valve switching means 33 is provided).

(Function) In the heat pump type heating and water heater described above, heating and hot water supply are operated simultaneously only when the heating load is below a reference value and the hot water supply load is within the reference range. As a result, it is possible to maintain the efficiency of the heat pump at a high level by avoiding simultaneous operation of heating and hot water supply when the water temperature is low or when the hot water temperature is high.

Furthermore, since simultaneous operation is performed only when the heating load is below a reference value, even if the heating side is affected by the hot water supply side, discomfort to the user can be prevented.

(Embodiments) Next, specific embodiments of the heat pump type heating and water heater of the present invention will be described in detail with reference to the drawings.

First, Fig. 2 shows a refrigerant circuit diagram, and as shown in the figure, this air conditioner consists of an outdoor unit 7)
and a hot water supply unit Y. The outdoor unit X has a compressor 1, and a discharge pipe 2 and a suction pipe 3 of the compressor 1 are each connected to a four-way switching valve 4. The compressor 1 has an inverter 5 for controlling its rotational speed, that is, its compression capacity, and the discharge pipe 2 has a first solenoid valve 6, and the suction pipe 3 has an Akie emulator 7. Intervention is provided.

A first gas pipe 8 and a second gas pipe 9 are connected to the four-way switching valve 4, and the first gas pipe 8 is connected to the outdoor heat exchanger 1.
0, and the second gas pipe 9 is connected to a header 11, with a gas shutoff valve 12 interposed therebetween. Further, the outdoor heat exchanger 10 includes a first liquid pipe 1
3 is connected, and this first liquid pipe 13 is connected to a liquid receiver 14, and a first expansion valve 15 is interposed in the middle thereof. A second liquid pipe 16 is connected to the liquid receiver 14, and this second liquid pipe 16 has a liquid closing valve 17 in the middle.
Between the second gas pipe 9 and the second liquid pipe 16, a plurality of branch refrigerant pipes 18 (four in the case of the figure) are arranged in parallel with each other. Each branch refrigerant pipe 18...18 is connected to an indoor heat exchanger 19...19 (only one is shown) and a second expansion valve 2.
0...20 are interposed. Furthermore, each indoor unit A
Although only one indoor unit A is illustrated in ND, the indoor heat exchangers 19...19 and indoor fans 21...
21.

On the other hand, a third gas pipe 22 is further connected to the discharge pipe 2 of the compressor 1, and a hot water supply heat exchanger 23 is connected to the third gas pipe 22.
is further connected to the liquid receiver 14 through a third liquid pipe 24 . A second electromagnetic valve 25 is provided in the third gas pipe 22, and a capillary tube 26 and a check valve 27 are provided in the third liquid pipe 24. Note 28
is a hot water tank.

In the refrigerant branch pipes 18...18, first temperature sensors 29...29 are attached at positions between each of the indoor heat exchangers 19...19 and the second expansion valves 20...20. However, the first temperature sensors 29...29 are for detecting the temperature of the liquid refrigerant condensed in the indoor heat exchangers 19...19 during heating operation. Also, in the third liquid pipe 24, a second temperature sensor 30 is attached at a position between the hot water supply heat exchanger 23 and the check valve 27; This is for detecting the temperature of the liquid refrigerant condensed in the hot water supply heat exchanger 23 during operation. Note that the temperature of the third liquid pipe 24 detected by the second temperature sensor 30 is approximately the same as the temperature of the hot water in the hot water storage tank 28.

During heating operation of the heating water heater, the first solenoid valve 6 is opened;
The compressor 1 is operated with the second solenoid valve 25 closed. Then, the refrigerant passes through the four-way switching valve 4 and the second gas pipe 9, condenses in each indoor heat exchanger 19...19, and then passes through the second liquid pipe 16 and the first liquid pipe 13. Outdoor heat exchanger 1
The gas is evaporated at 0, and then returns to the compressor 1 via the first gas pipe 8 and the four-way switching valve 4.

Also, during hot water supply operation, the first solenoid valve 6 is closed and the second solenoid valve 2 is closed.
5 is opened and the compressor 1 is operated.

Then, the refrigerant passes through the third gas pipe 22 and is condensed in the hot water supply heat exchanger 23, and then passes through the third liquid pipe 24, the liquid receiver 14, and the first liquid pipe 13 to the outdoor heat exchanger. The gas is evaporated in the gas 10 and then returns to the compressor 1 via the first gas pipe 8 and the four-way switching valve 4 in the same manner as described above.

When heating and hot water supply are to be operated simultaneously, both the first solenoid valve 6 and the second solenoid valve 25 are opened, and the refrigerant discharged from the compressor 1 is transferred to the indoor heat exchanger 19 and the hot water supply. It is supplied to both the heat exchanger 23 and the heat exchanger 23 in parallel.

The cooling operation in the above device is performed by switching the four-way switching valve 4 and circulating the refrigerant from the outdoor heat exchanger 10 side to the indoor heat exchanger 19 side. The discharged refrigerant is transferred to the third gas pipe 22
It is condensed in the heat exchanger 23 for hot water supply via the , and then evaporated in each indoor heat exchanger 19 through the third liquid pipe 24 , liquid receiver 14 , and second liquid pipe 16 . , then the second
This is done by circulating the gas in a circuit that returns to the compressor 1 via the gas pipe 9 and the four-way switching valve 4.

Next, the operation control system of the heating water heater will be explained based on FIG. 3. First, the outdoor unit X has an outdoor control device 31 and an inverter control device 32.
This inverter control device 32 is for controlling the frequency of the inverter 5, that is, the rotation speed of the compressor 1. Furthermore, temperatures detected by the first temperature sensors 29 . . . 29 and the second temperature sensor 30 are input to the outdoor control device 31 . 33 is a valve switching means,
The valve switching means 33 controls the operations of the first solenoid valve 6, the second solenoid valve 25, the four-way switching valve 4, etc. in response to a command from the outdoor control device 31, and controls heating operation, hot water supply operation, heating operation, etc.・It is for controlling the operating status such as simultaneous hot water supply operation.

A remote control box 34 placed indoors such as a kitchen is connected to the outdoor control device 31, and by operating a hot water tank heating switch 35 provided in this box 34, the outdoor control device 31 It is possible to output a hot water storage tank heating request signal. In this case, a hot water temperature thermometer 36 is arranged in the hot water storage tank 28, and when the hot water storage tank heating request signal is output and there is an operation request signal from the hot water temperature thermometer 36, hot water supply operation is performed. It has become.

On the other hand, each of the indoor units I-A-D has an indoor control device 37, and each indoor control device 37 includes a heating switch 38, a cooling switch 39, a room temperature setting switch 40,
Each indoor thermostat 41 has an indoor thermostat 41, and each indoor control device 37 connects the outdoor control device i! 31, based on the heating request signal, the cooling request signal, the air conditioning request or stop signal from the indoor thermometer 41, and the temperature difference between the indoor temperature and the set temperature (Δ
T-fold signals are respectively output. In the outdoor control device 31, a load grasping circuit 44 constituting a part of the heating load detection means 42 is configured to be able to calculate the sum ΣΔT of the ΔT multiplied signals from the indoor units A-D during operation. .

Next, regarding the operation control method of the heating water heater, in a state where a heating operation is requested (a state where a heating request signal is output from the heating switch 38 and an air conditioning request signal is output from the indoor thermostat 41), a hot water heating operation is requested. If there is (
The operation control method in a state in which a hot water tank heating request signal is outputted by the hot water tank heating switch 35 and an operation request signal is received from the hot water temperature thermostat 36 will be explained based on FIG. 4. First, in step S1, it is determined whether or not there is a heating request. If YES, the next step S1 is performed.
2, and in the case of No, it is determined in step S3 whether or not there is a hot water supply request. Step S2 is NO
In this case, the heating only operation is started in step S4, and this operation is continued until an air conditioning stop signal is output from the indoor thermometer 41 in step S5) and step S described above.
Return to l. Further, if step S3 is NO, the process returns to step S1, whereas if YES, hot water supply independent operation is performed in step S6. This hot water supply operation is
The operation continues until there is a heating request signal (step S7) or the hot water temperature thermostat 36 is turned off (step S8), and when the hot water supply operation is ended as described above (step S
In 9), the process returns to step Sl.

On the other hand, if step S2 is YES, that is, if there are both a heating operation request and a hot water supply operation request, the following values 1 to 2 are read out in step SIO. That is, ■ temperature difference ΔT between the room temperature and set temperature in the indoor units A-D during operation, ■ temperature TLI...TL4 detected by the first temperature sensor 29 in the indoor units I-A-D during operation, ■
This is the temperature TCA detected by the second temperature sensor 30 during the previous hot water supply operation.

Note that the temperature TCA detected by the second temperature sensor 30 is detected and stored every time the water supply operation is performed, and the previous TCA is read out when proceeding to step SIO. Further, in subsequent steps 811 to S13, other judgments (11 to (3)) are made based on the above six values, and only when all of (1) to (3) are satisfied, heating is performed in step 514. Simultaneous operation of hot water supply is performed, and in other cases, the process moves to step S4 and individual heating operation is performed.

(1) Total ΔT of indoor units A-D during heating operation,
That is, the absolute value of ΣΔT is smaller than a reference value (for example, 2° C.) (step Sll).

This determines whether the heating load on indoor units A-D during heating operation is smaller than a reference value.

In other words, if heating and hot water supply are operated simultaneously when the heating load is heavy, heating capacity may be insufficient and comfortable air conditioning may be impaired. , to prevent this.

(21'I" CA is indoor unit 1-A during heating operation.
TLI of -D is less than or equal to the maximum value TLn of TL4 (Step 512).

This is because in a state where the temperature of the refrigerant condensed on the hot water supply heat exchanger 23 side is higher than the temperature of the refrigerant condensed on the indoor heat exchanger 19 side, the condensation temperature of the refrigerant is lower than that of the indoor heat exchanger 19 for heating.
This is because the non-condensable refrigerant that does not exchange heat passes through the hot water supply heat exchanger 23, which not only prevents hot water from being heated but also disturbs the refrigeration cycle and reduces efficiency.

(3) TCA is within the standard temperature range (e.g. 20℃≦TCA
<52.5° C.) (step 513).

This is due to TCA, which means that if the temperature of the hot water you are about to heat is lower than 20℃, the hot water supply load will be excessive, causing a cold draft, and indoor unit A-
In D, the blowout temperature may drop and comfortable air conditioning may not be possible. To prevent this, heating and hot water supply are operated simultaneously when the TCA is higher than the reference temperature. Note that the upper limit value of TCA is set to ensure the heat resistance limit of equipment such as piping and the efficiency of the refrigeration cycle.

The simultaneous heating and hot water supply operation in step S14 is continued until either the air conditioning stop signal from the indoor thermometer 41 (step 515) or the stop signal from the hot water temperature thermometer 36 (step 316) is output.

As mentioned above, in the above heating and water heater, the indoor unit 1
- The air conditioning load (absolute value of ΣΔT) on the A-D side is smaller than the reference value, and the load on the hot water supply side, that is, the temperature TC^ of the hot water to be heated, is lower than the condensate refrigerant on the indoor heat exchanger 15 side. When the temperature is below TLn and above the reference temperature (20°C), heating and hot water supply are operated simultaneously.
The simultaneous operation described above can be performed with high efficiency while maintaining a comfortable heating state.

In the above, the heating load detection means 42 is used to calculate the temperature difference ΔT between the room temperature detected by the indoor thermostat 41 and the set temperature in the indoor unit 1-A-D during operation, and calculate the sum ΣΔ of the temperature difference ΔT.
Although the air conditioning load is determined by determining T by the load determining circuit 44, other methods may be used. Further, in the above, the second temperature sensor 30 is used as the hot water supply load detection means, and the third temperature sensor 30 is used as the hot water supply load.
Although an example has been shown in which the temperature of the liquid pipe 24 is detected, other methods such as directly detecting the temperature of the hot water are also possible. Further, in the above, the operation control means 43 performs step S in FIG.
Although it is configured from L1 to step S14 and step S4, these configurations can be arbitrarily changed within the range of achieving the same function.

(Effects of the Invention) In the heat pump type heating and water heater of the present invention, when the indoor heating load is below the standard value and the hot water supply load is within the standard range, heating and hot water supply are operated simultaneously. Therefore, the simultaneous operation described above can be performed with high efficiency while maintaining a comfortable heating condition.

[Brief explanation of drawings]

The figures show an embodiment of the heat pump type heating and water heater of the present invention, in which Fig. 1 is a functional system diagram, Fig. 2 is a refrigerant circuit diagram,
FIG. 3 is a block diagram of the operation control system, and FIG. 4 is a flowchart for explaining the operation control method. 1...Compressor, 10...Outdoor heat exchanger, 15...
1st expansion valve, 19... Indoor heat exchanger, 23... Hot water supply heat exchanger, 30... Second temperature sensor (hot water supply load detection means), 33... Valve switching means, 41... - Indoor thermostat, 42...Heating load detection means, 43...Operation control means.

Claims (1)

[Claims] 1. The refrigerant discharged from the compressor (1) is transferred to the indoor heat exchanger (
19), an expansion mechanism (15), and an outdoor heat exchanger (10) in order to return to the compressor (1), and a hot water supply heat exchanger ( 23), the heating load detection means (42) detects the heating load on the indoor heat exchanger (19) side, and the heating load detection means (42) on the hot water supply heat exchanger (23) side. hot water supply load detection means (30) for detecting the load; and valve switching means (33) for simultaneous operation of heating and hot water supply when the heating load is below a reference value and the hot water supply load is within the reference range. ) A heat pump type heating and water heater characterized by having an operation control means (43) for controlling the operation control means (43).