CO2 air-conditioner heat pump defrosting system and defrosting control method thereof

Abstract

The invention discloses a CO2 air-conditioner heat pump defrosting system and a defrosting control method thereof. The CO2 air-conditioner heat pump defrosting system comprises a compressor, a gas cooler, a heat regenerator, an electronic expansion valve, an electromagnetic valve, an evaporator, a gas-liquid separator and a heat regeneration electric adjusting valve. An exhaust port of the compressor is sequentially connected with a cycle working medium pipeline of the gas cooler, a first pipeline of the heat regenerator, the electronic expansion valve, the evaporator, the gas-liquid separator, the heat regeneration electric adjusting valve and a second pipeline of the heat regenerator to return to a gas return inlet of the compressor through pipelines, and heat pump cycle passageway is formed; and the electromagnetic valve is in parallel connection with the electronic expansion valve. The scheme of the inverter compressor, hot gas straight flowing and the additional heat regenerationelectric adjusting valve is adopted. Accordingly, the system can provide proper defrosting heat amount within a full temperature interval in a defrosting mode, the operation reliability of the systemin the full temperature interval in the defrosting mode is guaranteed, and then the good defrosting effect is achieved in the full temperature interval in the defrosting mode.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, in particular to a CO 2 An air-conditioning heat pump defrosting system and a defrosting control method thereof. Background technique [0002] With the development of the world economy, energy plays an increasingly important role in human activities, and can even be said to be the main material basis for the survival and development of human society. In my country, energy shortage has become an obstacle restricting the sustainable and rapid development of our national economy. In view of this, the Chinese government has mentioned the issues of energy conservation, environmental protection and low-carbon economy in all fields such as industry and civil use to an unprecedented level in national economic activities. high. In terms of technology and economy, heat pump technology is an energy-saving and effective way to solve the heating problem of industrial and agricultural production with great...

AI Technical Summary

Problems solved by technology

Compared with hot gas throttling defrosting, natural circulation defrosting takes a long time to stop and defrost, exhaust throttling defrosting and throttling pressure difference is large, electric heating defrosting requires additional power and defrosting time has no advantage, hot water defrosting exists Problems with possible freezing of water, while ultrasonic defrosting techniques are costly and technically difficult

The traditional hot gas throttling defrosting also has the characteristics of poor defrosting effect in some ambient temperature ranges and poor system reliability during defrosting

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