JPS5880438A - Heat pump type hot water supplier - Google Patents

Abstract

PURPOSE:To improve the heating capacity and obtain high temperature hot water by a method wherein hot water, which has been heated at a coolant condenser, is reheated at a heat exchanger wound around the shell of a compressor. CONSTITUTION:A heat pump unit 1 consists of a high pressure compressor 3, a coolant condenser 4, a capillary tube 5, an evaporator 6 and an accumulator 8. The heat exchanger 9 is wound around the shell of the compressor 3. The water in a hot water storage tank 2 is sent by means of a pump 10 to the condenser 4 and, after being heated at the condenser 4, led to the heat exchangr 9 and, after being reheated at the heat exchanger 9, flowed back into the hot water storage tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water heating heat exchanger for producing hot water using a heat pump and using it for hot water supply.

Conventionally, in this type of heat pump water heater, refrigerant condensation
A water heat exchanger was used to generate hot water using the heat of condensation of the high-temperature refrigerant discharged from the compressor for hot water supply. The problem in this case is that the pressure on the high-pressure side of the refrigerant circuit system is determined by the condensation temperature of the refrigerant, so it is difficult to increase the flooding temperature because it is warm.

In addition, in heat pumps that use high-pressure compressors,
Since the compressor shell becomes very hot due to the heat generated by the motor and the heat generated by the compression operation, heat dissipation from the compressor shell is promoted, which increases heat loss and contributes to a decrease in heating capacity. As described above, conventional systems still have problems in terms of a reduction in heating capacity due to heat loss from the compressor shell and an increase in the temperature of hot water.

The present invention eliminates these conventional drawbacks, and aims to prevent heat loss, improve heating capacity, and produce hot water with a higher temperature for hot water supply.

To achieve this objective, the present invention provides a compressor shell heat exchanger in addition to the refrigerant condensation/water heat exchanger of a heat pump using a high-pressure compressor, and generates hot water by heating from the compressor shell as well. By doing this, heat radiation from the compressor shell, which is in a high temperature state due to the heat generated by the motor and the heat generated by the compression operation, is prevented.The hot water after being heated in the co-exchanger is guided to the Ff compressor shell heat exchanger and re-circulated. By heating the water, the water is first heated at a relatively low condensing temperature to create hot water, and then reheated in the compressor shell, which has a relatively high temperature, so hot water can be supplied at a high temperature. .

An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a heat pump unit that produces hot water, and 2 is a hot water storage tank. In the heat pump unit 1, 3 is a Takada compressor, 4 is a refrigerant condensing/water heat exchanger, 5 is a capillary cube, 6 is an evaporator, 7 is a fan, 8 is an accumulator, and 9 is one of the features of the present invention. High pressure type compressor 3
A compressor shell heat exchanger is wound around the shell of the compressor shell and heats high temperature EE compressor shell hot water. 10 is a pump.

In the above configuration of the heat pump unit 1, the hot water is
Due to the operation of the compressor 3, the refrigerant '#! It is first produced in the condensation/water heat exchanger 4. At this time, the pump 1o causes the water below the hot water storage tank to flow into the refrigerant condensing/water heat exchanger 4, so that it is heated by the heat of condensation of the refrigerant and hot water is obtained.

However, in heating due to refrigerant condensation, there is a limit to the hot water temperature depending on the condensation temperature of the refrigerant, and in order to increase the hot water temperature, the condensation temperature will increase, and the E force in the refrigerant circuit will also increase as the condensation temperature increases. If the OE power becomes high, the compressor 3 will be operated under overload and the coefficient of performance of the heat pump will also decrease, which is not preferable. Therefore, in the present invention, in addition to the refrigerant condensing/water heat exchanger 4, a high-pressure type UE, a Uf in the condenser 3, and a condenser shell heat exchanger 9 are provided to improve heating capacity and hot water temperature. It is something.

In other words, the high-pressure compressor 3 reaches the highest temperature in the refrigerant circuit system due to the heat generated by the built-in motor and the heat generated by the compression operation. Therefore, heat loss due to heat radiation from the compressor 3 has reduced the heating capacity.In the present invention, in order to prevent heat loss from heat radiation from the high-temperature compressor 3, a compressor shell heat exchanger 9 is provided to remove water. By heating, the heating capacity and hot water temperature can be improved. In the embodiment of the present invention, the water sent by the pump 1o is guided to the compressor shell heat exchanger 9 and reheated to raise the temperature.

The hot water obtained in this way is stored from the top of the hot water storage tank 2, and when hot water is tapped, tap water flows in from the water supply pipe 11 installed at the bottom of the hot water storage tank 2, pushing hot water up from below. Hot water is drawn out through a hot water supply pipe 12 connected to the top.

The refrigerant that makes up the heat pump cycle is compressor 3.
The refrigerant gas discharged from the refrigerant condensing and water heat exchanger 4 converts it into an i-supply liquid, and then flows into the evaporator 6 via the capillary cube 5, where it is evaporated using the air as a heat source by the operation of the fan 7, and then transferred from the accumulator 8 to the compressor 3. cycle.

As described above, according to the heat pump water heater of the present invention, the temperature characteristics of the heat pump cycle can be improved by providing a compressor shell heat exchanger in addition to the refrigerant condensing/water heat exchanger of a heat pump using a Takada compressor. Consider and make effective use of
It is possible to prevent overheating by heating from the compressor shell heat exchanger as well as the refrigerant condensing/water heat exchanger, thereby improving the heating capacity and hot water temperature. In addition, it has no relation to the FEiff three-shell heat exchanger structure, and is a simple structure because it can be obtained by simply wrapping it around the compressor shell in a heat transfer manner as a heat exchanger consisting of a water flow path.

Furthermore, after the water flow is heated in the refrigerant condensing/water heat exchanger, the hot water is guided to the compressor shell heat exchanger and reheated, so there is no increase in condensing temperature or refrigerant pressure, and the compressor It is possible to reheat hot water in the compressor shell, which is at the highest temperature, to obtain hot water at a higher temperature and use it for hot water supply without overloading the compressor or reducing the coefficient of performance.

The compressor shell heat exchanger has the effect of actively absorbing the heat generated by the motor and the heat generated by the compression operation in the compressor to prevent abnormal temperature rises in the compressor, thereby improving the reliability, characteristics, and performance of the motor. In addition to improving the lubrication characteristics of the compressor, even if the refrigerant temporarily flows back into the compressor when the operation is stopped, the compressor shell heat is heated by the hot water in the exchanger and flows out to the evaporator and accumulator. This also has the effect of preventing refrigerant from accumulating in the compressor and protecting the compressor.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of a heat pump water heater according to the present invention. 1...Heat pump unit, 2...
Hot water storage tank, 3... Compressor, 4... Refrigerant condensation, water heat exchanger, 9... Compressor shell heat exchanger, 1o... Pump . Name of agent: Patent attorney Toshio Nakao and 1 other person/2

Claims (2)

[Claims] (1) Heat pump refrigerant condensation using a high-pressure compressor
A heat pump water heater that is equipped with a compressor shell heat exchanger in addition to the water heat exchanger, and generates hot water by heating the compressor shell as well. (2) Claim 1 in which the hot water heated in the refrigerant condensing/water heat exchanger is guided to the compressor shell heat exchanger for reheating.
Heat pump water heater as described in section.