Energy-saving defrosting system of air source heat pump and control method for energy-saving defrosting system

Abstract

The invention belongs to refrigerating equipment, and particularly relates to an energy-saving defrosting system of an air source heat pump. The energy-saving defrosting system for the air source heatpump comprises a three-in-one defrosting gas-separating liquid accumulator, wherein one side of the three-in-one defrosting gas-separating liquid accumulator is connected with a first pipeline whichis divided into two branches; refrigerant in the three-in-one defrosting gas-separating liquid accumulator performs heat exchange twice to generate super-cooling and proper over-heating, so that a refrigerant enthalpy value in a cycle is increased, and maximal freezing capacity can be performed during evaporation; meanwhile, it is guaranteed that the phenomenon that liquid flows back into a compressor to cause liquid compression is avoided; the sense of value is increased, aesthetic sense of the whole machine is improved, and phenomena of dripping, getting moldy and smelly and polluting the surrounding environment are avoided; and gas and a liquid path are simultaneously defrosted, so that the air source heat pump also can normally operate at an extremely low temperature, it is guaranteedthat the unit normally operates without affecting efficiency of the unit, and the defrosting effect is more complete.

Description

technical field [0001] The invention belongs to refrigeration equipment, in particular to an energy-saving defrosting method for an air source heat pump. Background technique [0002] At present, the state encourages the north to use air source heat pump heating for coal-to-electric heating to reduce smog and non-renewable energy consumption. The energy efficiency and defrosting technology of air source heat pump heating in low ambient temperature are very critical. In other cases, when the surface temperature of the heat exchanger on the heat source side is lower than the air dew point temperature and lower than 0°C, frost may form on the surface of the heat exchanger, and the heating efficiency of the unit is low. At present, the traditional defrosting methods in the industry are four-way valve switching to cooling mode defrosting, electric defrosting and hot gas bypass defrosting, etc., but the defrosting effect is mediocre, the heat energy consumption is large, and the u...

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Problems solved by technology

[0002] At present, the state encourages the north to use air source heat pump heating for coal-to-electric heating to reduce smog and non-renewable energy consumption. The energy efficiency and defrosting technology of air source heat pump heating in low ambient temperature are very critical. In other cases, when the surface temperature of the heat exchanger on the heat source side is lower than the air dew point temperature and lower than 0°C, frost may form on the surface of the heat exchanger, and the heating efficiency of the unit is low.

At present, the traditional defrosting methods in the industry are four-way valve switching to cooling mode defrosting, electric defrosting and hot gas bypass defrosting, etc., but the defrosting effect is average, the heat energy consumption is large, and the utilization rate is low, resulting in high cost.

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