制冷系统连续融霜过程中制冷温度变化规律的研究

Research on the variation of refrigeration temperature with continuous defrosting of refrigeration system

连续融霜是一种在除霜过程中制冷不间断、库温上升小、无需附加能耗的除霜方式。为探究在不同工况下除霜时,连续融霜系统制冷剂进出口温度、库温波动及融霜时间的变化规律,在库温-18、-12℃两种工况下,对冷风机制冷剂进出口温度、库温、融霜时间及融霜能耗进行测量分析。结果表明:库温-18℃,制冷风机微压差计示数在17 Pa时比在60 Pa融霜时的库温波动值和融霜时间分别减少0.8℃、200 s,融霜能耗降低9.03%;库温-12℃,制冷风机微压差计示数在17 Pa比在40 Pa融霜时的库温波动和融霜时间分别减少2℃、284 s,融霜能耗降低53.3%。因此,融霜时制冷风机霜层厚度对库温、融霜时间及融霜能耗有一定影响。

Continuous defrosting is a defrost method in which the refrigeration is uninterrupted,the temperature of cold storage has a low increase and no additional energy consumption has been required during the defrost process. In order to explore the defrosting of the continuous defrost system under different working conditions, the varations of the inlet and outlet temperatures of the continuous defrost system,the temperature of the cold storage and the change of the defrost time, under the two conditions of cold storage temperature-18 and-12 ℃, the inlet and outlet temperatures,cold storage temperature, defrost time and defrost energy consumption of the refrigerant of the air cooler were measured and analyzed. The results show that the thickness of the frost on the cooling fans will affect the cold storage temperature,defrost time and the energy consumption of defrosting. When the temperature of cold storage is at-18 ℃ and the fan pressure difference is 17 Pa, the temperature fluctuation and defrosting time are reduced by 0.8 ℃ and 200 s respectively compared with 60 Pa, the energy consumption is reduced by 9.03%. When the temperature of cold storage is at-12 ℃, and the fan pressure difference is 17 Pa, the temperature fluctuation and defrosting time are reduced by 2 ℃ and 284 s respectively compared with 40 Pa,the energy consumption is reduced by 53.3%.