JPH02223768A - Heat pump type hot water supply equipment - Google Patents

Abstract

PURPOSE:To shorten rise time, minimize change in hot water supply temperature and eliminate the need for the drive of a compressor for heat storage after the supply of hot water by installing an accumulator which comprises a phase change heat storage material on the discharge side of a compressor on the outside of a hot water supply circuit of a user side heat exchanger. CONSTITUTION:When an attempt is made to supply hot water by opening a faucet 7, a control circuit 10 starts a compressor 10 with a signal of a pressure detector 9, heats supply water through a secondary side pipeline 2a of a user side heat exchanger 2, and lets the water in a pipeline 3b of an accumulator 3, heats the water with paraffin heat-stored to an upper preset temperature, takes from the paraffin its condensation heat, heats it to a specified temperature, and supplies the hot water. When heat exchange starts from the user-side heat exchanger 2, the paraffin is heated until the accumulator reaches the upper preset temperature, and continues heat storage operation. In this manner, the accumulator 3 can prompt the rise of hot water supply temperature during the stating time of hot water supply, stabilize the hot water supply temperature simultaneously, and eliminate rise time lag and fluctuations in the hot water supply temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a so-called instantaneous water heating type heat pump water heater that does not have a hot water storage tank.

[Conventional technology]

Conventionally, heat pump water heaters include those that have a hot water storage tank and those that do not.

For those with hot water storage tanks, hot water can be heated and stored using heat pump action using late-night electricity, but in the winter, for example, hot water heated to 100°C may reach 60 or 80°C when used. As seen in cases such as the above, the heat loss from the hot water storage tank is large, and it is necessary to heat the water repeatedly to maintain the temperature, which increases the operating rate of the compressor and does not produce sufficient economic effects. Ta.

On the other hand, those without a hot water storage tank are efficient because they operate the compressor only when hot water is being supplied, but unlike those with a hot water storage tank, they cannot raise the water temperature by repeatedly passing through a heating cycle, The water temperature is city water, and the temperature is low.
The problem is that depending on the season, the temperature of the hot water supply does not rise easily, and it takes a long time to reach the desired water temperature.

[Problem to be solved by the invention]

The present invention was made in view of the above-mentioned conventional problems.In a heat pump water heater without a hot water storage tank, the present invention shortens the rise time to a predetermined hot water supply temperature, reduces fluctuations in the hot water temperature, and reduces heat storage after hot water is supplied. Therefore, the purpose of the present invention is to provide a heat pump water heater that does not require the operation of a compressor.

[Means to solve the problem]

In order to achieve the above object, a heat storage device made of a phase change heat storage material (PCM) was provided on the outlet side of the hot water supply circuit of the user side heat exchanger and on the discharge side of the compressor.

[Effect]

According to the above configuration, a heat storage device is disposed on the hot water supply outlet side of the user-side heat exchanger of a heat pump type water heater, and the heat storage device is penetrated through the water supply pipe and the heat radiation pipe of the refrigerant circuit, and when hot water is not being supplied. The heat released from the refrigerant circuit due to the operation of the compressor is stored in a heat storage device, and the heat is released from the heat storage device as solidification heat of the heat storage material until the heat exchanger on the user side starts up during hot water supply, and the heated water reaches the set temperature. The temperature is maintained, and the temperature of the heat storage device is maintained high even after hot water is supplied, so that the compressor does not need to continue operating for heat storage even after hot water has been supplied.

〔Example〕 The details of the present invention will be explained with reference to the drawings.

The figure is a piping block diagram showing the configuration of the present invention, in which the refrigerant circuit runs from the compressor 1 to the primary piping 3a of the heat storage device 3, the primary piping 2a of the utilization side heat exchanger 2, the expansion valve 4, and the outdoor heat exchanger. Vessel 5
A circulation path is formed which returns to the compressor 1 through the

On the other hand, the water supply circuit enters the secondary piping 2b of the user-side heat exchanger 2 from the city water pipe, passes through the secondary piping 3b of the heat storage device 3,
A path is formed that passes through the flow rate adjustment valve 6 and reaches the snake lower.

The user-side heat exchanger 2 is a double-pipe heat exchanger, with the inner pipe serving as the secondary pipe 2b for distributing water supplied from the city water pipes, and the outer pipe serving as the primary pipe 2a for distributing refrigerant. It is formed like this.

The heat storage device 3 has a primary pipe 3a for refrigerant passing through the inside and a secondary pipe 3b for water supply formed in a coil shape and arranged close to each other, and the inside of the heat storage device 3 is filled with paraffin as a PCM heat storage material. ing.

In addition, 8 is a temperature sensor that detects the temperature of paraffin in the heat storage device 3, 9 is a pressure sensor that detects the opening/closing state of the snake lower as a change in water pressure, and 10 is a temperature sensor that detects the temperature of the paraffin in the heat storage device 3. When the temperature of the paraffin in the heat storage device 3 detected by the temperature detector 8 is lower than a preset lower temperature (for example, 50°C), the control circuit that controls the operation of the compressor 1 uses the signal. starts the compressor 1, and controls the operation of the compressor 1 to be stopped when the upper set temperature (for example, 100°C) is exceeded, and the lower snake is opened to reduce the water pressure in the pipe, and the pressure detector 9 When the pressure detected by
The compressor 1 is operated until the snake lower is closed and the detected pressure exceeds the preset pressure, and the temperature of the paraffin in the heat storage device 3 exceeds the upper set temperature. The compressor 1 is controlled by the control circuit IO so that the operation of the 4M compressor 1 is stopped in response to the signal.

As described above, when the snake lower is opened, the compressor 1 is started to operate by the control circuit 10, and the refrigerant (for example, R-22) is compressed by the compressor and becomes a high-temperature gas state, and the primary side piping 3a of the heat storage device 3 is heated. The heat is radiated to the paraffin in the heat storage device 3 to warm the water supply flowing through the secondary piping 3b, and the heat is further radiated to the water supply flowing through the primary piping 2a of the user heat exchanger 2 and the secondary piping 2b to be cooled. , is liquefied by releasing heat of condensation,
It passes through the expansion valve 4, expands rapidly, takes away the heat of evaporation from the outside air by the heat source side heat exchanger 5, returns to the gas state, and returns to the compressor 1.
Return to the suction tube.

By repeating this circulation, heat is removed from the outside air in the form of heat of evaporation of the refrigerant by the heat exchanger 5 on the heat source side, and heat of condensation of the refrigerant is transferred from the heat storage device 3 and the heat exchanger 2 on the user side to the secondary side piping 3b and 2
Heat is applied to the water flowing through b, creating a heat pump effect and heating the water supply.

When the power is initially turned on and the snake lower is opened to start hot water supply, the control circuit 10 starts the compression Ia1 based on the pressure detector 9, but the heat storage device 3 and the user-side heat exchanger 2 are not in a sufficiently heated state. It is not possible to supply hot water at the set temperature until the compressor 1 is in stable operation and the heat storage device 3 and user-side heat exchanger 2 reach the predetermined temperatures. When the temperature detected by the temperature detector 8 is lower than the lower set temperature, for example, 50°C, the control circuit 10 starts the compressor 1 and discharges the compressed high-temperature refrigerant gas. (approximately 100° C.) in the pipe section, the paraffin heat storage material in the heat storage device 3 is rapidly heated and stored.

Thereafter, the control circuit 10 controls the compression ta so that the paraffin temperature of the heat storage device 3 is within the set temperature range by the temperature detector 8.
1 is stopped and controlled.

From this state, when the snake lower is opened to supply hot water, the control circuit 10 starts the compressor 1 based on the signal from the pressure detector 9, and the water is supplied through the secondary piping 2b of the heat exchanger 2 on the user side. The hot water enters the pipe 3b of the heat storage device 3, is heated by the paraffin stored at the upper set temperature, and is heated to a predetermined temperature by taking away the coagulation heat of the paraffin, and then hot water is supplied.

When heat exchange starts from the user side heat exchanger 2, the heat storage device 3 heats the paraffin until it reaches the upper set temperature 7 and continues to store heat.

Until the heat exchange in the heat exchanger 2 on the user side is fully started, the supply water is mainly heated by the heat dissipation from the stored paraffin. must be large enough to ensure a sufficient amount of heat dissipation within this time.

As described above, the heat storage device 3 can speed up the rise of the hot water temperature at the start of hot water supply and stabilize the hot water temperature, eliminating the delay in the start-up of the pump type water heater and the variation in the hot water temperature. There is.

In addition, by increasing or decreasing the flow rate of the supplied water using the flow rate adjustment valve 6, the temperature of the hot water discharged from the snake lower can be adjusted to an arbitrary temperature.

〔Effect of the invention〕

As described above, by placing a heat storage device on the discharge side of the compressor and the hot water supply side of the water supply pipe, and then placing a heat exchanger on the user side, the hot water supply temperature is stabilized within the set temperature range, and the hot water supply ends. A heat pump water heater that does not require subsequent operation for heat storage can be provided.

[Brief explanation of the drawing]

The drawing is a piping block diagram showing the configuration of the heat pump water heater of the present invention. In the figure, 1 is the compressor, 2 is the user side heat exchanger, 2a is the refrigerant side piping, 2b is the same water supply side piping, 3 is the heat storage device, 3, 1 is the same refrigerant side piping, and 3b is the same water supply side piping. , 4 is an expansion valve, 5 is a heat source side heat exchanger, 6 is a flow rate adjustment valve, 7 is a faucet, 8 is a temperature detector, 9 is a pressure detector, and IO is a control circuit.

Claims (1)

[Claims] In a heat pump water heater that compresses refrigerant gas with a compressor and uses the condensation heat generated to boil water in a user-side heat exchanger, a phase change occurs between the outlet side of the hot water supply circuit of the user-side heat exchanger and the discharge side of the compressor. A heat pump water heater characterized by being equipped with a heat storage device made of heat storage material (PCM).