JPH0227582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a highly efficient heat pump water heater that utilizes supercooling.

[Conventional technology] Conventional heat pump water heaters generally use a compressor,
Water is heated by a heat exchanger that serves as a condenser in a heat pump refrigerant circuit consisting of a heat exchanger (condenser, evaporator) and a decompression expansion mechanism.

[Problem to be solved by the invention] According to the above-described conventional heat pump water heater,
The refrigerant that passes through the condenser and is condensed through heat exchange with water is now reduced in pressure by the next decompression expansion mechanism, but the refrigerant condensed in this condenser still has sufficient heat. This heat is not used for any purpose.

In view of the fact that the heat of the refrigerant condensed in the condenser is not utilized in any way as described above, the present invention
A heat pump water heater using supercooling aims to effectively utilize the heat of this refrigerant and increase the hot water supply capacity by devising the direction of the refrigerant flow and water flow, the hot water supply opening, etc. This is what we provide.

[Means for Solving the Problems] In order to achieve the above problems, the present invention provides a compressor,
In a heat pump air conditioning/heating/water supply system equipped with a heat exchanger, a vacuum expansion mechanism, etc., an appropriate supercooling heat exchanger is interposed between the vacuum expansion mechanism and the condenser, and one separate and separately prepared pressure A hot water storage tank consisting of a container has a make-up water port at the bottom and a pre-stop hot water supply port at the top, and water in the tank is drawn out from the bottom of the tank and water is reintroduced into the tank from the top of the tank. A circulation pipe equipped with a pump is provided, and the make-up water is always preheated by exchanging heat with the liquefied refrigerant in the supercooling heat exchanger in a counter flow, and then introduced into the hot water storage tank from the make-up water port, and the circulation pipe The water passing through the circulation pipe is heated by a condenser through heat exchange with the liquefied refrigerant in a counterflow.

[Function] The high temperature refrigerant discharged from the compressor first exchanges heat with the water passing through the circulation pipe that circulates the water in the hot water storage tank in the condenser, and then is condensed in the condenser, but still has sufficient residual heat. The refrigerant is used to exchange heat with makeup water supplied to the hot water storage tank in a subcooling heat exchanger. The water that exchanges heat with the refrigerant in the condenser and the subcooling heat exchanger both exchange heat with the refrigerant in a countercurrent flow, so that efficient heat exchange is performed. Also, since the water replenished into the hot water storage tank is heated by heat exchange with the supercooling heat exchanger, the water that has been heat exchanged with the condenser in the middle of the circulation pipe that circulates the water in the hot water storage tank is The high-temperature water is reintroduced into the hot water storage tank from the top of the tank. Therefore, high temperature water is always located at the top of the hot water storage tank, and since the hot water supply port is provided at the top of the hot water storage tank, high temperature water can always be supplied from the hot water supply port.

[Example] The present invention will be described in detail below based on an example shown in the drawings.

In the drawing, 1 is a compressor, 2 is a condenser installed on the discharge side piping of the compressor 1, 3 is a four-way switching valve, and 4 is a condenser installed on the discharge side piping of the compressor 1.
5 is the evaporator; 6 is the condenser 2;
This is a supercooling heat exchanger interposed between the decompression expansion mechanism 4 and the decompression expansion mechanism 4, and these are connected in series by a refrigerant pipe 7 to form a heat pump refrigerant circuit 8.

Reference numeral 9 denotes a hot water storage tank consisting of a pressure vessel prepared separately from the heat pump refrigerant circuit 8. The hot water storage tank 9 is provided with a make-up water port 10 at the bottom and a pre-stop hot water supply port 11 at the top. Reference numeral 12 denotes a circulation pipe having an opening at one end connected to the lower part of the hot water storage tank 9 and an opening at the other end communicating with the upper part of the tank 9, and this circulation pipe 12 is equipped with a pump 13.
With this pump 13, water in the tank 9 is drawn out from the lower part, introduced into the tank 9 from the upper part, and circulated. This circulation pipe 12
On the way, the refrigerant passes through the condenser 2 of the heat pump refrigerant circuit 8, where the water passing through the pipe 12 and the refrigerant exchange heat in counterflow. 14
is a water supply pipe that connects to the replenishment water port 10 of the hot water storage tank 9 and replenishes water into the tank 9, and this water supply pipe 14 passes through the supercooling heat exchanger 6 of the heat pump refrigerant circuit 8 on the way, Here, the make-up water and refrigerant passing through the same pipe 14 exchange heat in counterflow.

Next, the operation of the above embodiment will be explained.

The water supplied to the hot water storage tank 9 through the water supply pipe 14 passes through the supercooling exchanger 6 of the heat pump refrigerant circuit 8 on the way, and then passes through the condenser 2 where the refrigerant still has sufficient heat. The hot water is heated by exchanging heat with countercurrents and is replenished into the hot water storage tank 9.

The water replenished into the hot water storage tank 9 is pumped to the pump 13.
The refrigerant is circulated from the lower part to the upper part through the circulation pipe 12, but in the middle of the circulation pipe 12, it passes through the condenser 2 of the heat pump refrigerant circuit 8, where a counterflow with the high temperature refrigerant discharged from the compressor 1 is generated. However, since the water replenished into the hot water storage tank 9 has been previously heated in the subcooling heat exchanger 6, the water heat exchanged in the condenser 2 is converted into high-temperature water with high efficiency. Then, the hot water is introduced into the hot water storage tank 9. Due to the difference in specific gravity of the hot water in the hot water storage tank 9, high temperature water is stored in the upper part of the tank 9 and low temperature water is stored in the lower part, and the high temperature water introduced from the circulation pipe 12 is stored in the tank 9. Since the hot water is introduced from the top, the highest temperature hot water is located at the top of the tank 9. Since the hot water inlet 11 is provided at the top of the hot water tank 9, this hot water inlet 11 is located at the top of the tank 9.
You can always get high-temperature water from the tap.

[Effects of the Invention] As described above, according to the present invention, in a heat pump air-conditioning/heating/water supply system that includes a compressor, a heat exchanger, a vacuum expansion mechanism, etc., an appropriate supercooling device is provided between the vacuum expansion mechanism and the condenser. A hot water tank is equipped with a heat exchanger, and a separate pressure vessel is provided with a make-up water inlet at the bottom and a pre-stop hot water inlet at the top. A circulation pipe equipped with a pump is provided to draw out the water and reintroduce the water into the hot water storage tank from the upper part of the hot water storage tank. After being preheated, the water is introduced into the hot water storage tank from the make-up water port, and the water passing through the circulation pipe is heated by a condenser in a counterflow with the liquefied refrigerant, so that the hot water storage tank is heated. The makeup water supplied to the tank is heated by exchanging heat with the supercooling heat exchanger, and then replenished into the same tank.Then, it is heated by exchanging heat with the condenser in the middle of the circulation pipe, so it is heated with high efficiency. Moreover, since the refrigerant and makeup water exchange heat in countercurrent flow, the heat exchange efficiency is good, so the hot water supply capacity is increased and high temperature water can be obtained. Moreover, in the hot water storage tank, a high-temperature water layer is formed at the top and a low-temperature water layer is formed at the bottom, and since the hot water supply port is provided at the top of the tank, high-temperature water can always be drawn from the hot water supply port. There is an effect that can be done.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of the entire configuration. 1... Compressor, 2... Condenser, 3... Four-way switching valve, 4... Decompression expansion mechanism, 5... Evaporator, 6...
Subcooling heat exchanger, 7... Refrigerant piping, 9... Heat pump refrigerant circuit, 10... Make-up water port, 11...
...Hot water inlet, 12...Circulation pipe, 13...Pump, 14...Water supply pipe.

Claims (1)

[Claims] 1. In a heat pump air-conditioning/heating water supply system equipped with a compressor, a heat exchanger, a vacuum expansion mechanism, etc., an appropriate subcooling heat exchanger is interposed between the vacuum expansion mechanism and the condenser, and one is separated and separately installed. A hot water storage tank consisting of a prepared pressure vessel is provided with a make-up water port at the bottom and a pre-stop hot water supply port at the top, and the water in the hot water storage tank is drawn out from the bottom of the hot water storage tank and into the hot water storage tank from the top of the hot water storage tank. A circulation pipe equipped with a pump for introducing water again is provided, and the make-up water is always preheated by exchanging heat with the liquefied refrigerant in the counterflow in the supercooling heat exchanger, and then introduced into the hot water storage tank from the make-up water port, A heat pump water heater utilizing supercooling, characterized in that the water passing through the circulation pipe is heated by exchanging heat with a liquefied refrigerant in a counterflow by a condenser in the middle of the circulation pipe.