低温冷库热氟融霜的探讨与设计

Discussion and design on hot fluor defrosting in cold storage

低温冷库在运行过程中,伴随着结霜现象,导致制冷效率下降,常规的除霜方法不尽人意,本文通过制冷系统的优化设计,依靠阀件开闭状态的切换,改变制冷剂的流向,使高温高压的制冷剂进入蒸发器内部,利用制冷剂的显热和潜热,对蒸发器表面的霜层进行加热,从而达到除霜的目的。实现了制冷与融霜工况可以同步进行、库温波动小、效率高的热氟融霜系统。

In the operation of the low-temperature cold storage,there often appears frost phenomenon,which results in a decline in refrigeration efficiency,so,the conventional defrosting method cannot meet people s needs. The author of this paper puts forward the following solutions: with the optimization design of the refrigeration system,the flow direction of the refrigerant is changed by the switch of the open and closed state of the valve parts,and to make the refrigerant of the high-temperature and high-pressure enter into the evaporator,and the surface frost layer of the evaporator is heated by the obvious and latent heat of the refrigerant,so as to achieve the purpose of defrosting. The system of hot fluorine defrosting with low temperature fluctuation and high efficiency can be carried out simultaneously in refrigeration and frost melting conditions.