Heat accumulating solar coupling enhanced vapor injection type air source heat pump system and control method thereof

Abstract

The invention relates to a heat accumulating solar coupling enhanced vapor injection type air source heat pump system and a control method thereof. The system comprises an enhanced vapor injection compressor, a four-way reversing valve, a gas-liquid separator, a first electronic expansion valve, a second electronic expansion valve, an indoor heat exchanger, an outdoor heat exchanger, a hot water tank, an electric heater and related valves, and is characterized by further comprising a heat accumulator and a solar heat collector. When the environment temperature is lower than a switching temperature in the winter, solar energy is coupled with an air source heat pump by the heat accumulator; and when the heat of the heat accumulator is not enough, a heat storage process of the heat pump is started. In other seasons, the solar energy is directly used for heating water, and therefore, the advantages of the solar energy are fully played. The heat accumulator is used as an auxiliary heat source of an air injection branch, and the mass flow rate of a refrigerant of an air injection line and the heating capacity of a unit can be greatly increased, so that the unit can still run stably when the environment temperature is quite low (for example, the environment temperature is lower than -20 DEG C). Meanwhile, defrosting of the unit can be implemented well.

Description

technical field [0001] The invention relates to the field of heat supply, and relates to a heat storage type solar energy coupling air injection enthalpy increasing type air source heat pump system and a control method thereof. Background technique [0002] When the air source heat pump operates in a low temperature environment (such as below -5°C), due to the increase in the compression ratio of the compressor, the exhaust temperature will be too high, the heating effect will deteriorate, the energy efficiency ratio of the unit will be greatly reduced, and the exhaust temperature will rise. High, the reliability becomes poor, and the lower the ambient temperature, the more serious this problem is, and it is also accompanied by the problem of frosting and defrosting of the unit. The traditional air injection enthalpy increase and two-stage compression technology can improve the heating performance of the unit at low temperature, but when the outdoor temperature is very low (...

AI Technical Summary

Problems solved by technology

In the field of heating, the combination of solar energy and air source heat pump is an effective technical means to utilize solar energy, but the intensity of solar radiation is weak in winter, and the heat collection efficiency at low temperature is low, and the heat collector is only used in winter, resulting in The economy of the collector is not good

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