Performance analysis of a cascade lithium bromide absorption refrigeration/dehumidification process driven by low-grade waste heat for hot summer and cold winter climate area in China. (15th January 2021)

• Record Type: Journal Article
• Authors: Xu, Aixiang; Xu, Mengjin; Xie, Nan; Liang, Jiawei; Zeng, Keman; Kou, Guangxiao; Liu, Zhiqiang; Yang, Sheng
• Is Part Of: Energy conversion and management. Volume 228(2021)
• Publication Date: 2021-01-15
• Subjects: Lithium bromide absorption refrigeration system -- Lithium chloride liquid dehumidification system -- Coefficient of performance -- Low-grade waste heat -- Hot summer and cold winter area; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2020.113664
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A cascade absorption refrigeration/dehumidification process is proposed. The proposed system has an excellent ability to utilize the low-grade waste heat. The system has good dehumidification effect in hot summer and cold winter area. The proposed system can remove 27.85% more moisture than reference system. The effects of parameters on the proposed system are analyzed and compared. Abstract: Recovery of low-grade waste heat has great potential to reduce energy consumption around the world. In this paper, a novel cascade lithium bromide absorption refrigeration/dehumidification system is developed to recover low-grade waste heat with temperature range from 90 °C to 150 °C for dehumidification in hot summer and cold winter climate area of China. This system consists of two subsystems: lithium bromide absorption refrigeration system and lithium chloride liquid dehumidification system. The low-grade waste heat is applied by two subsystems in a cascade approach. The key parameters in terms of air temperature, air humidity, solution concentration, and solution temperature are investigated to obtain the optimization design of the proposed system. Performance of the proposed system is analyzed for different refrigeration temperatures. The results show that the max coefficient of performance for the proposed system is 0.6029. The moisture removal rate and the humidity efficiency are 20.20 g/kg and 0.9385. The novel coupling system develops a creative and efficient way to recover low-grade waste heat for dehumidification in hot summer and cold winter climate area of China.