太阳能喷射制冷系统临界冷凝特性实验研究

Experimental study on critical condensation characteristics of solar ejector refrigeration system

为了了解太阳能喷射制冷系统的系统性能随冷凝温度的变化规律,进而提出合理的系统运行控制策略,文中设计并搭建了太阳能喷射制冷实验研究平台,以HFC134a为制冷剂,对太阳能喷射制冷系统的临界冷凝特性进行了实验研究。研究表明:太阳能喷射制冷系统工作时,系统性能系数(COP)、制冷量和能效比(EER)等参数随着冷凝温度的升高呈现缓慢变化或基本不变的趋势,但是当冷凝温度达到一定值时,系统的COP、制冷量和EER等急剧变小;蒸发温度一定时,系统的临界冷凝温度随着发生温度的升高而升高;当发生温度一定,系统的临界冷凝温度随着蒸发温度的升高而升高。基于上述研究结果,指出当太阳能喷射制冷系统工作时,为了保持系统的高效运行,应该通过合适的控制策略,使系统的冷凝温度在低于其临界冷凝温度情况下运行。

In order to understand the performance of solar ejector refrigeration system with the change of condensation temperature, and thus proposing a reasonable system operation control strategy, an experimental solar ejector refrigeration system was designed and constructed to research the critical condensation performance with HFC134a as refrigerating medium. The results demonstrate that when the solar ejector refrigeration system is working, the coefficient of performance, cooling capacity and energy efficiency ratio value keep almost constant with the condensation temperature rise, and then reduce dramatically when the condensation temperature achieves the critical point. The critical condensation temperature increases with increasing the generator temperatures when the evaporation temperature remains constant, and the critical condenser temperature increases with increasing evaporation temperature when the generator temperature remains constant. Based on the above results, when the solar ejector refrigeration system is working, the condensation temperature should be kept below the critical condensation temperature by the appropriate control strategy for keeping the system running efficiently.