Simulation study of a heat pump drying system using a solar assisted flash tank vapor injection cycle

被引:12
作者
Yu, Jin [1 ,2 ]
Yu, Jianlin [2 ]
机构
[1] Shanghai Jiao Tong Univ, Inst Refrigerat & Cryogen, Shanghai 200240, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Refrigerat & Cryogen Engn, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
Vapor injection; Heat pump drying system; Direct -expansion solar collector; Air circulation loop; PERFORMANCE ANALYSIS; SCROLL COMPRESSOR; DRYER; EXPERIMENTATION; EXCHANGERS; DESIGN; CO2;
D O I
10.1016/j.solener.2023.01.033
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Heat pumps are widely used in many fields due to their high efficiency and energy saving potential. However, the application of single-stage vapor-compression heat pump dryer is limited due to low drying temperature and the decreasing reliability for high temperature drying. In order to apply heat pump to high temperature drying, a heat pump drying system using a solar assisted flash tank vapor injection cycle (HPDS-SFVIC) is presented. This system allows the solar collector to absorb solar energy at a lower temperature and achieves significant improvement of heating capacity and drying temperature. The effects of component configuration and various operating conditions on the drying system with open, bypass, and closed air circulation loop are evaluated, respectively. The results show that under a typical operating condition, the proposed cycle achieves great performance improvement of 21.8% and 75.8% in both the heating coefficient of performance (COPh) and heating capacity, compared with the conventional cycle. Utilization of solar energy is advantageous to provide higher air temperature for drying. With increased solar radiation intensity and collector area, heating capacity and drying temperature can be improved, while COPh remains constant as 5.0-5.2. When the drying system provides dry air at 65 degrees C stably, it saves 27.8%-41.7% of power consumption, and COPh is improved by 41.2%-62.1% on average.
引用
收藏
页码:223 / 239
页数:17
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