JPS58142142A - Heat pump type hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To realize efficient hot water supply even when the outside temperature is low by a method wherein a heat medium circuit and a water circuit are provided and the radiator of the heat medium circuit transfer its heat to the main heat transfer section of the water circuit and at the same time the heat absorber of the heat medium circuit is heated at the heating section of the water circuit. CONSTITUTION:The heat medium forms a refrigerating cycle comprising being discharged from a compressor 13 and then past through a radiator 14 and further past through an expander 15 and a heat absorber 17 successively and sent back to the compressor 13. On the other hand, water forms a water cycle comprising being sucked up from a hot water storage tank 10 by means of a pump 18 and then past through the radiator 14 and further past through a heater 19 and sent back to the hot water storage tank 10. Under the conditions as mentioned above, heat is transfered from the outside air to the heat medium at the heat absorber 17, while heat is transfered from the heat medium to the water at the main heat exchange section 12a. Consequently, the water is heated to high temperature by passing through the radiator 14 and, after giving a part of its heat to the absorber 17, stored in the hot water storage tank 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump water heater, and one object of the invention is to efficiently supply hot water even when the outside temperature is low.

A conventional heat pump water heater will be explained with reference to FIG. 1.

In FIG. 1, reference numeral 1 denotes a hot water storage tank, which is connected to a heat pump device 2 by a water pipe 3.

The heat pump device 2 is composed of a refrigerant circuit including a compressor 4, a radiator 6, an expander 6, and a 77-unit heat absorber 8. On the other hand, on the hot water tank 1 side,
A circular water circuit is formed with the pump 9 and the radiator 5 via the water pipe 3.

In the above configuration, the refrigerant discharged from the compressor 4 passes through the radiator 5, then the expander 6 and the heat absorber 8 in order, and is then sucked into the compressor 4 to form a refrigeration cycle. On the other hand, hot water storage T! ! The water stored in v1 passes through the radiator 5 by the operation of the pump 9 and returns to the hot water tank 1 again, forming a water cycle. During this time, in the heat absorber 8, heat is transferred from the outside air to the refrigerant passing through the heat absorber 8, -
On the other hand, in the radiator 5, J-heat transfer is performed from the refrigerant to the water, so the water coming out of the radiator 5 becomes high temperature and is stored in the hot water storage tank 1. Hot water can be obtained by the following process.

However, when the outside air temperature decreases, the temperature of the heat absorber 8 in the refrigerant circuit decreases, and frost forms on the surface of the heat absorber 8, making it difficult to exchange heat between the outside air and the refrigerant, and heating the water in the radiator 6. capacity becomes very small. As frost builds up further, the outside air and refrigerant cannot exchange heat in the heat absorber 8, and the heat capacity of the radiator 5 1 and filtrate υ11 is almost lost, making it difficult to operate the heat pump water heater at low outside temperatures. becomes.

Therefore, the present invention is as described in (-) above, which solves the drawbacks of conventional heat pump water heaters and enables the heat pump water heater to operate even at low outside temperatures.

Hereinafter, a heat pump water heater according to an embodiment of the invention will be described with reference to the second □□□.

In Fig. 2, 10 is a hot water storage tank, and a heat pump device 1
1 through a water pipe 12.

The heat pump device 11 includes a compressor 131 and a radiator 14.
A refrigerant circuit is formed by sequentially connecting an expander 16 and a heat absorber 17 with a fan 16 in an annular manner through refrigerant pipes. Further, the hot water storage tank 10 forms a water circuit equipped with a pump 18. In this water circuit, a main heat exchange part 12a (e.g., double pipe structure) in which the -HI3 exchanges heat with the heater 14, and a heater 19 provided in close proximity to the heat absorber 14 are connected in series. It's not set up.

Next, the operation of the above configuration will be explained. The refrigerant discharged from the compressor 13 passes through the radiator 14, passes through the expander 15 and the heat absorber 17 in order, and then returns to the compressor 13, forming a refrigeration cycle. on the other hand,
Water pumped up from the hot water tank 1o by a pump 18 passes through a radiator 14, then a heater 19, and returns to the hot water tank 1° again, forming a water cycle. During this time, heat absorber 1
In 7, heat is transferred from the outside air to the refrigerant, while
In the radiator 14, heat is transferred from the refrigerant to water in the main heat exchange section 12a. Therefore, the water after passing through the radiator 14 is heated and reaches a high temperature, and a part of the heat is given to the heat absorber 17 in the heater 19 and then stored in the hot water storage tank 10.

By repeating the above two operations, hot water is obtained in the hot water storage tank 1o.

In addition, in Japan, when the outside temperature is low, the temperature of the heat absorber 17 becomes low, but since the heat absorber 19 is heated by the temperature of the water passing through the heater 19, frost formation may occur on the heat absorber 17. This means that heat pump water heaters can operate even with low outside temperatures. Further, a part of the heat given to the water in the heat radiator 14 is transferred to the heat absorber 17 in the heater 19.

The heat is again exerted by the water in the radiator 14, resulting in a so-called heat recovery phenomenon, which has almost no effect on the heating capacity.

In the non-example, heat exchange (thermal conduction) between the water circuit and the refrigerant circuit was performed using a double pipe structure, but a structure in which the heat radiation fins are shared with the radiator 14 and the main heat exchange part 12a, or other In addition, the relationship between the heat absorber 17 and the heater 19 is not limited to being close to each other, but may be a structure in which they are in close contact with each other.

As is clear from the above embodiments, the uninvented heat pump water heater consists of a refrigerant circuit equipped with a compressor, a heat absorber, an expander, and a radiator, a circulation pump hot water storage tank, a main heat conduction part, and a heating part. 41. A circulating water circuit is provided, the heat radiator and the main heat conduction part are placed in close proximity or in close contact with each other to conduct heat, and the heating part is placed in close proximity with or in close contact with the heat absorber so that the heating part absorbs heat. .

It is designed to heat a heater, and the hot water that has been heated through the main heat conduction section flows into the heating section, where it is sucked.

As seen in conventional heat pump water heaters, frost forms on the heat absorber when the outside temperature is low, reducing the heating capacity of the heat pump water heater or causing it to stop operating11. It has various advantages, such as ``continuous heating operation can be obtained without any heating, and since the heat of the heater can be recovered by the heat absorber, it has almost no effect on the heating capacity.''

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional heat pump water heater;
The figure is a configuration diagram of a heat pump water heater according to an embodiment of the invention. 1o...Hot water storage tank, 12a...-main heat exchange section, 13...Compressor, 14...Radiator,
16... Expander, 17... Heat absorber, 18
...pump, 19...heater.

Claims (1)

[Claims] A refrigerant circuit comprising a compressor, a heat absorber, an expander, and a radiator, and a circulating water circuit comprising a circulation pump, a hot water storage tank, a heat conduction part, and a heating part are provided, and the radiator and A heat pump type water heater in which a main heat conduction part is placed in close proximity or in close contact with each other to conduct heat, and the heating part is placed in close proximity or in close contact with a heat absorber so that the heat absorber is heated by the heating part.