| 摘要: |
| R290作为一种天然制冷剂，被认为是R22的最佳替代工质而被各方研究。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在系统各部件内的制冷剂质量分布。同时，通过实验对比分析了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。研究结果表明：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7.37%，所以减小系统冷凝器内容积并且缩短系统液体管路是有效的降充注手段。在出水温度一定时，R290在高温工况下有明显优势，系统COP较R22系统提升了13.9%。而在环境温度一定时，出水温度的变化对R22与R290系统性能的影响趋势较为一致。 |
| 关键词: R290 充注量模型 商用冷水机组 极限工况 |
| DOI： |
| 投稿时间：2017-08-05
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| 基金项目: |
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| Application of R290 in High-powered Commercial Water Chiller |
| Liu Cichong,Shi Junru,Wu Yun,Shi Junye,Ge Fanggen,Chen Jiangping |
| (School of Mechanical Engineering, Shanghai Jiao Tong University;Zhejiang Dunan Artificial Environment) |
| Abstract: |
| 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 suggest 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. |
| Key words: R290 refrigerant charge model commercial water chiller extreme high temperature |
