低品位余热源新型双喷射式制冷系统研究

提出了用气-液喷射器代替机械泵,有效回收低品位余热能源的新型双喷射式制冷系统.该制冷循环本身不需要消耗电能.研究了气-液喷射器的运行特性和喷射系数与工作参数的关系,发现在一定范围内系统效率随工作压力提高而提高,然后下降.分析了双喷射式制冷系统COP与发生器温度、冷凝器温度的关系,模拟了不同余热温度条件下双喷射式制冷系统的运行性能,结果表明制冷剂R123制冷性能优于R134a.系统COP可达0.3.

Study of innovative bi-ejector refrigeration system by low-grade waster heat

A new bi-ejector refrigeration system to recover the low-grade waster heat widely available for industries was presented. The mechanical circulation pump was replaced with a liquid-vapor ejector. No electricity power was needed in this refrigeration cycle. The relationship between the liquid-vapor ejector operation characteristics, its performance and the operation parameters were investigated. It is shown that the system performance goes up with the increase of operation pressure in some scope, and then drops. The relationship between the coefficient of performance \%(COP)\% and the generator temperature, the condenser temperature was analyzed. Efficiency simulation on this bi-ejector under different waster heat temperatures is presented. R123 is shown to be a promising working fluid and \%COP\% reaches 0.3.