| 摘要: |
| 为研究载冷剂物性以及冷却器组合形式对冷库间接制冷系统性能的影响，本文搭建了冷库间接制冷系统实验台，对LM-4/LM-8两种载冷剂和不同冷却器的系统性能开展实验研究。结果表明：载冷剂物性和冷却器组合形式都对系统的降温时间产生影响，在相同工况下，通过对比翅片顶排冷却器、光管墙排+翅片顶排冷却器和光管墙排+光管顶排冷却器3种冷却器可知，光管墙排+翅片顶排冷却器的LM-8载冷剂系统降温时间最短，比同工况下采用LM-4载冷剂的系统降温时间减小了30.4%；找出了最佳工况对应的雷诺数，并表明采用LM-8载冷剂的制冷系统最佳COPr和间接制冷系统综合最佳COPc分别比采用LM-4载冷剂的系统提高10.7%和10.9%；3种冷却器形式中，采用LM-8载冷剂的系统总能耗比采用LM-4载冷剂的系统总能耗分别低了5.8%~13.6%，2.2%~9.1%，3.3%~7.2%；在冷库间接制冷系统的应用中，可优先使用LM-8载冷剂以及光管墙排+翅片顶排冷却器。 |
| 关键词: 间接制冷系统 冷却器 载冷剂 COP |
| DOI： |
| 投稿时间：2021-11-04 修订日期：2022-02-16
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| 基金项目:本文受天津市科学技术局科技帮扶提升重大工程项目 (20ZYCGSN00310)和辽宁省中央引导地方科技发展专项项目(2021JH6/10500081)资助。 |
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| Experimental Study on the Effect of Physical Properties of Secondary Refrigerant on the Performance of Indirect Refrigeration Systems in Cold Storage under Different Cooler Combinations |
| Wang Miantong,Gao Jian,Sun Zhili,Liu Shengchun,Bai Xinmeng,Huang Hongli,Su Chao |
| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce;ChaoYang GuangDa Chemical Co.,Ltd.) |
| Abstract: |
| This study examines the influence of the physical properties of the secondary refrigerant and cooler combinations on the performance of an indirect refrigeration system used in cold storage. An indirect refrigeration system test-bed was built and the performance of two new secondary refrigerants, LM-4 and LM-8, were compared using different coolers to determine the secondary refrigerant with the best performance and the optimal cooler combination. The results demonstrate that the cooling time of the system was affected by the physical properties of the secondary refrigerant and cooler combination. Under the same conditions, the cooling time of the LM-8 system with a finless wall-mounted cooler and a top-mounted fin-tube cooler was the shortest compared with the standalone top-mounted fin-tube cooler and a finless wall-mounted cooler with a finless top-mounted cooler; the cooling time of the LM-8 system is approximately 30.4% less than that of the LM-4 system. The Reynolds numbers corresponding to the optimal working parameters were derived. The optimal refrigeration coefficient of performance (COPr) and comprehensive coefficient of performance (COPc) of the LM-8 system were higher than those of the LM-4 system by 10.7% and 10.9%, respectively. Among the three types of coolers, the total energy consumption of the LM-8 system was 5.8%–13.6%, 2.2%–9.1%, and 3.3%–7.2% lower than that of the LM-4 system. In conclusion, the LM-8 system with a finless wall-mounted cooler and a top-mounted fin-tube cooler is recommended for indirect refrigeration systems in cold storage applications. |
| Key words: indirect refrigeration system cooler secondary refrigerant COP |
