一种改进的吸收–压缩混合GAX制冷循环理论性能分析

Performance Analysis of a Modified Novel Absorption-compression Hybrid GAX Cycle

吸收式制冷是热能利用的重要形式之一,氨吸收式制冷中的GAX(发生–吸收热交换器)循环具有相对较高的效率,吸收–压缩耦合的混合GAX循环可以进一步提高GAX循环效率。为了应对GAX循环中GAXA(发生–吸收热交换器吸收器)和GAXG(发生–吸收热交换器发生器)热量匹配问题,提出了一个改进的吸收–压缩混合GAX循环。研究了蒸发温度、冷凝温度、放气范围和换热温差对新循环和基础GAX循环的影响。新循环较基础GAX循环性能在大部分工况下有显著提升,COP提高可达30%以上,尽管如此,模拟现实新循环仍具有一定的适用范围。

Absorption refrigeration is one of the most important method on utilizing thermal energy. GAX（generator-absorber heat exchanger） cycle has a relatively high performance in ammonia absorption refrigeration family. Absorption-compression coupled hybrid GAX cycle can further improve the efficiency of GAX cycle. In order to solve the heat marching problem of GAXA（generator-absorber heat exchanger absorber） and GAXG（generator-absorber heat exchanger generator） heat exchangers, a modified novel absorption-compression hybrid GAX cycle was proposed. Effect of evaporation temperature, cooling temperature, degassing range and approach temperature on performance of new cycle and basic GAX cycle was studied. Performance of new cycle has a significant improvement, compared to basic GAX cycle, which 30% improvement can be achieved. Nevertheless, the scope of application of the new cycle varies with working conditions.