R290在大功率商用冷冻冷水机组的应用

Application of R290 in High-powered Commercial Water Chiller

本文建立了R290大功率冷水机组的充注量模型并进行了实验验证,模型误差在3%以内。基于此模型,分析了R290在系统各部件内的质量分布。实验对比了R290与R22大功率冷水机组在不同环境温度、不同出水温度下的性能变化趋势。结果表明:R290主要存在于系统冷凝器中,制冷剂占比为56.95%,而系统液体管路中制冷剂占比为7.37%,所以减小系统冷凝器内容积并缩短系统液体管路是降低系统充注量的有效方法。当出水温度一定时,R290在高温工况下具有显著优势,系统COP较R22系统提升了13.9%。当环境温度一定时,出水温度的变化对R22与R290系统性能的影响趋势一致。

In this article,a model used to predict the R290 refrigerant charge in a high-powered commercial water chiller was developed,and the error is within 3%. Meanwhile,the influences of the ambient temperature and outlet water temperature on a commercial high-powered water chiller system have been studied by applying R290 and R22. The results show that when the system is in operation,the major refrigerant is stored in a condenser and liquid pipes,with 56. 95% and 7. 37% of the total refrigerant charge,respectively. Based on the experimental results,it is easy to conclude that under high ambient temperature,R290 has a huge advantage compared to R22. At the same water outlet temperature,the R290 system COP is improved by 13. 9% compared to R22 at an ambient temperature of 50 ℃,whereas the R22 and R290 systems have the same tendency with an increase in water outlet temperature.