极限工况下开放式CO2制冷系统的设计

Study on the Performance of an Open Loop Cycle Carbon Dioxide Refrigeration System

因矿井灾变环境下电源使用条件苛刻,矿用可移动式救生舱制冷系统使用开放式二氧化碳无源制冷系统。极限工况下,现有的二氧化碳开放式制冷系统在运行中容易出现冷启动冰堵、过冷结霜及高湿过热等故障。针对极限工况故障的产生进行热力学分析,设计了一套新型开放式二氧化碳制冷系统。实验结果表明,新型系统可解决冷启动时流量过大问题,避免长时间运行产生的系统冰堵状况;高温低湿工况下提高蒸发器换热能力;低温高湿工况下减少蒸发器结霜量。

Due to the harsh conditions of power supply in mine catastrophes,an open CO2 passive refrigeration system is used in the mine-used movable rescue cabin refrigeration system.Under the extreme working conditions,the current CO2 open refrigeration system is prone to faults such as cold-start ice blockage,undercooling frosting,and high-humidity overheating during operation.A thermodynamic analysis is carried out for the generation of faults under extreme conditions,and a new open CO2 refrigeration system is designed.The results show that the new system can solve the problem of excessive flow during cold start and avoid system ice blockage caused by the long-term operation.Besides,it can improve the heat exchange capacity of evaporators under high temperature and low humidity conditions,and reduce the frost accumulation of evaporators under low temperature and high humidity conditions.The proposed CO2 open refrigeration system,designed for the harsh mine conditions,provides significant reference and guide to the design and application of the CO2 open refrigeration system in closed lifesaving space.