JPS62218769A - Heat pump air-conditioning hot-water supply device - 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] [Technical Field] The present invention relates to a heating and hot water supply device using a heat pump cycle, and the temperature of the hot water condenser can be lowered by providing a pressure regulating valve between a heating condenser and a hot water condenser. This makes it possible to maintain the temperature of the heating condenser at a high level even when the air conditioner is on, making it possible to perform heating and hot water at the same time.

Conventionally, as shown in FIG. 2, a heating water supply system using a heat pump cycle has a compressor 11, a heating condenser 2, a hot water condenser 3, an expansion valve 4, and an evaporator 5 connected to a refrigerant pipe 6. a heat pump cycle connected with a heat storage tank 7,
Some systems are constructed of a heat storage circulation circuit formed by connecting the circulation pump 8 and the hot water supply condenser 3 through a water circulation pipe 9, and a heating fan IO.

The operation of this device will be described below. In the compressor 1, the low temperature and low pressure refrigerant vapor is compressed to become high temperature and high pressure, and is directed to the condenser 2. At this time, in the case of heating, the circulation pump 8 is stopped and the heating fan IO is operated. On the other hand, in the case of hot water supply, the circulation pump 8 is operated and the heating fan 10 is stopped.

At this time, the high-temperature, high-pressure refrigerant vapor transfers heat to the heating condenser 2 for space heating and to the hot water condenser 3 for hot water supply, condenses and liquefies, and is depressurized by the expansion valve 4. After it becomes a gas-liquid two phase, it is evaporated in the evaporator 5 to become low-temperature, low-pressure steam. This vapor is led out to the evaporator 5, and then compressed again by the compressor 1, and the above cycle is repeated.

When such a heating and hot water supply device performs heating and hot water supply at the same time, the following problems occur due to the physical properties of the refrigerant and restrictions on cycle formation. If heating and hot water supply are to be performed at the same time, the heating fan lO and the circulation pump 8 will be operated at the same time. The refrigerant condensing temperature of the heating condenser 2 is preferably 45 to 60°C in order to blow out hot air, but the refrigerant condensing temperature of the hot water supply condenser 3 is preferably in the range of 10 to 60°C in order to raise the temperature of water. Change. Therefore, if heating and temperature supply are performed at the same time, and the condensation temperature of the hot water supply condenser 3 is 10°C because the water temperature in the heat storage circuit is low, the condensing pressure is also a low pressure commensurate with the 10°C. . At this time, the pressure of the heating condenser 2 is almost the same as that of the hot water supply condenser 3 because there is no pressure loss between the heating condenser 2 and the hot water supply condenser 3. Therefore, the condensation temperature of the heating condenser 2 is also the same as that of the hot water condenser 8.
Therefore, unless the air blowing temperature of the heating condenser 2 is less than 10°C, the refrigerant will not be condensed in the heating condenser 2 and heating and hot water supply cannot be performed at the same time.

Regarding this point, conventionally when performing heating, the circulation pump 8
The device is operated by stopping the heating fan IO and performing only heating, and when hot water is to be supplied, the heating fan IO is stopped and only hot water is supplied, which has the disadvantage of impairing convenience.

<Object of the Invention> In view of the above-mentioned problems, an object of the present invention is to provide a heat pump heating and hot water supply device that can simultaneously perform heating and hot water supply even when the water temperature in the heat storage circulation circuit is low.

<Embodiment> FIG. 1 is a schematic configuration diagram of a heat pump heating and hot water supply device showing one embodiment of the present invention. The main parts of the heat pump heating and water supply system of this embodiment are a compressor 1, a heating condenser 12, a hot water supply condenser 13, an expansion valve 14, an evaporator 15, and a pressure regulating valve equipped for the purpose of the present invention. 16a and the pressure regulating valve+
Temperature sensor paired with 6a +6b'! f- Refrigerant piping I
A heat pump cycle and a heat storage tank 18 connected by 7,
Consists of a circulation pump. Moreover, the pressure regulating valve 16a is a temperature sensor that detects the refrigerant condensation temperature of the heating condenser 13! 6b.

Hereinafter, the operation of the heat pump heating and hot water supply device will be explained. The basic heat pump cycle is the same as the conventional one, but the differences are a pressure regulating valve 16a that adjusts the refrigerant condensing temperature of the heating condenser 12 to a refrigerant condensing temperature suitable for heating, for example, 50°C, and a temperature sensor that detects the refrigerant condensing temperature. 16b
The point is that it is equipped with. In the compressor 11 , the low-temperature, low-pressure refrigerant vapor is compressed to become high-temperature and high-pressure, and is directed to the heating condenser 12 . For the sake of simplicity, the explanation will be made according to the cycle diagram of the heat pump heating and hot water supply system of this embodiment shown in FIG. 3, and the steps 1 to 2 will be explained. The cycle steps shown in FIG. 3 are as shown in the following table.

Even if the water temperature in the heat storage circulation circuit is low and the refrigerant condensation temperature in the hot water supply condenser 13 is 10°C, the heating condenser 12
The temperature sensor 16b detects the refrigerant condensation temperature, and the pressure regulating valve 16a throttles the refrigerant flow path to adjust the pressure.
Since the temperature is set at 0°C, the refrigerant transfers heat to the air and becomes condensed into two phases: gas and liquid (steps 2 and 3 in Figure 3).After that, the refrigerant is depressurized by the pressure reducing valve +6a, and is used for hot water supply. It heads to the condenser 13 (steps 8 to 4 in Figure 3). The depressurized refrigerant transfers heat to water in the hot water supply condenser 13 and is completely condensed into a liquid. t) Heads to the expansion valve I4 (steps 4 to 5 in FIG. 3). Next, the refrigerant is depressurized by the expansion valve 14, becomes a low-temperature, low-pressure gas-liquid two-phase, and heads toward the evaporator 15 (steps 5 to 6 in Figure 3). It evaporates into steam in Step 15 and is compressed again in Compressor 11, repeating the cycle (Step 67 in Fig. 3) 0 In addition, when heating and hot water supply are performed simultaneously using the heat pump heating and hot water supply system of this embodiment, the following occurs. There is an effect.

Immediately, the heat pump cycle for heating and hot water supply is 1 in Figure 3.
→ 2 → 3 → 4 → 5 → 6, but the conventional heating heat pump cycle is 1 → 2 → '3 → '
It is 4. Therefore, the enthalpy difference used for heating is C
However, the enthalpy difference used in the heating of the present invention is A
If hot water is being supplied at the same time, the enthalpy difference B used for hot water supply can also be used, so the amount of heat used increases by A+B-C, which is efficient. Further, the ratio between the enthalpy difference A used for heating and the enthalpy difference B used for hot water supply is determined by controlling the rotation speed of the heating fan 21 and changing the amount of heating air. In heating-only operation or hot-water supply-only operation, the heat pump cycle is the same as that of conventional devices.

<Effect of the invention> According to the present invention, there are the following effects.

(1) Unlike conventional heating and hot water supply devices, heating operation and hot water supply operation can be performed at the same time, so even if heating operation is required continuously, hot water supply is possible and the operation time for hot water supply is shortened. Conversely, even if hot water supply operation is required continuously, heating is possible.

(2) Even if a compressor with a constant rotation speed is used without using an inverter or the like, the heating capacity can be varied as long as there is a hot water supply load, making it possible to provide high-quality heating without fluctuations in room temperature.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a heat pump type heating and hot water supply device showing one embodiment of the present invention. Figure 2 shows the configuration of a conventional heat pump type heating and hot water supply system. FIG. 3 is an explanatory diagram of a heat pump cycle for heating operation of a conventional heat pump type heating and hot water supply apparatus and a heat pump cycle for heating and hot water supply operation of a heat pump type heating and hot water supply apparatus of the present invention. II... Compressor, 12... Heating condenser, 13...
・Condenser for hot water supply, 14... Expansion valve, 15... Evaporator, 16a... Pressure regulating valve, 16b... Temperature sensor, 1
7...Refrigerant piping, 18...Heat storage tank, 19...Circulation pump, 20...Water circulation piping, 21...Heating fan Agent Patent attorney Takeshi Sugiyama (1 other person) Yorozu l
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Claims (1)

[Claims] 1. In a heat pump heating and water heater that receives heat from a heat pump cycle to raise the temperature of fluid in a fluid circulation circuit, a heating condenser and a hot water supply condenser are connected in series, and a heating condenser is installed between the two condensers. A heat pump heating and water supply device characterized by being equipped with a pressure reducing valve that controls the condensation pressure of the heat pump.