四管制热气融霜系统特性分析及实验研究  

Characterization and Field Experimental Study of a Four-pipe Hot Gas Defrosting System

作　　者：孙欢[1] 李中伟 朱俊达 刘兴华[1] Sun Huan;Li Zhongwei;Zhu Junda;Liu Xinghua(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin,300134,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《冷藏技术》2022年第4期8-13,共6页Journal of Refrigeration Technology

摘　　要：本文提出一种新型四管热气融霜系统,在原有融霜系统上增设排液管及虹吸装置,热气融霜后的两相制冷剂从排液管排出至虹吸装置,不再通过回气管排至供液管。在杭州两个冷库进行现场对比实验。结果表明,融霜模式下,四管热气融霜模式下系统压比上升10.5%,传统热气融霜模式上升25.16%;蒸发器表面温度与库温的平均传热温差为2.02℃,是传统模式下平均传热温差的50%。另外,四管热气融霜模式的融霜时间比传统模式快1100 s,融霜时系统制冷能力比传统模式提高13%。四管热气融霜方式的系统稳定性、除霜效率均优于传统热气融霜方式。A new four tube hot gas defrosting system is proposed in this paper. A liquid discharge pipe and a siphon device are added to the original defrosting system. The two-phase refrigerant after hot gas defrosting is discharged from the liquid discharge pipe to the siphon device, and is no longer discharged to the liquid supply pipe through the return pipe. Field comparative experiments were carried out in two cold storages in Hangzhou. The results show that the system pressure ratio increases by 10.5% under the four tube hot gas defrosting mode and 25.16% under the traditional hot gas defrosting mode;The average heat transfer temperature difference between the evaporator surface temperature and the storage temperature is 2.02 ℃, which is 50% of the average heat transfer temperature difference under the traditional mode. In addition, the defrosting time of the four tube hot gas defrosting mode is 1100s faster than that of the traditional mode, and the refrigeration capacity of the system is 13% higher than that of the traditional mode.The system stability and defrosting efficiency of the four tube hot gas defrosting method are better than those of the traditional hot gas defrosting method.

关 键 词：四管 热气融霜 系统性能 制冷能力 融霜时间 

分 类 号：TB657.1[一般工业技术—制冷工程]