Multifunctional direct-expansion solar-assisted heat pump system

Abstract

The invention discloses a multifunctional direct-expansion solar-assisted heat pump system. A refrigerant circulating system of the invention comprises a compressor, an indoor heat exchanger, a refrigerant-water heat exchanger, an outdoor heat exchanger, a high-pressure liquid storage barrel, a throttling device, a triple valve, a check valve and a gas-liquid separator which are connected in sequence; and the water circulating system of the invention comprises a solar heat collecting device, a water tank, a water pump and a refrigerant-water heat exchanger which are connected in sequence. By effectively performing the functions of cooling / heating air-conditioners and water heaters, the invention has high energy efficiency, practicability and cost-effectiveness and broad market outlook; andthe invention is particularly suitable for places which are rich in solar-energy resources and in need of the cooling / heating air-conditioners and hot-water supply at the same time.

Description

technical field [0001] The invention belongs to the fields of heat pump air conditioners, heat pump water heaters and solar energy utilization, and in particular relates to a direct expansion multifunctional solar auxiliary heat pump system. Background technique [0002] The global energy crisis that broke out in the 1970s promoted the development of solar heat pumps. Solar-assisted heat pump is an effective way to combine solar energy and heat pump technology. It uses solar energy as supplementary heat on the evaporator side of the heat pump, and achieves more efficient heating by increasing the evaporation temperature. Solar-assisted heat pumps are divided into two types: indirect expansion (referred to as intermediate expansion) and direct expansion (referred to as direct expansion). The early solar-assisted heat pumps were mainly of the intermediate expansion type, and the solar collectors and heat pumps were connected through water or other refrigerants. The direct ex...

AI Technical Summary

Problems solved by technology

The existing direct expansion multifunctional solar-assisted heat pump has three methods. The first is to connect the water tank and its heat exchanger in series with the indoor unit. The disadvantage is that the function of heating water by the heat pump cannot be realized in the cooling season, and the energy saving of the heat pump cannot be effectively achieved. potential

The second is to connect the water tank and its heat exchanger in parallel with the indoor unit. The disadvantage is that the heat pump cannot realize the hot water heating function in the cooling season.

The third is to connect the water tank and its heat exchanger in series between the compressor and the four-way valve. The disadvantage is that the hot water in the water tank cannot be used for auxiliary defrosting during the heating season, which affects the comfort of indoor heating.

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