A numerical study on the performance of chemisorption heat pump according to various design conditions

• Published in: Applied thermal engineering 2024-04, Vol.243, p.122519, Article 122519
• Main Authors: Soo Kim, Hak, Ho KIM, Dong, Sub Kim, Jin, Kim, Wookyoung, KIM, Young
• Format: Article
• Language: English
• Subjects: Chemisorption; Cooling capacity; COP; Heat pump; Optimal design; SCP
• ISSN: 1359-4311
• DOI: 10.1016/j.applthermaleng.2024.122519

•The optimal design point of the system varies depending on the design purpose.•In some cases, performance decreases as number of heat exchanger tubes increases.•Cooling capacity increases 8.4 % as pressure drop requirement rises from 0.1 to 1 bar.•Optimized system design can improve system competitiveness. To achieve net zero, research on waste heat recovery systems is actively underway, and interest in chemisorption heat pumps is also increasing. In a chemisorption heat pump, the performance increases as the temperature of the heat source increases. However, in order to recover a larger amount of waste heat, it is necessary to develop a system that can utilize waste heat at a lower temperature. Most existing studies on chemisorption heat pumps have been conducted on systems operated using heat sources above 65 °C, and most studies have presented system performance results at specific design points. In this study, changes in system performance according to system design were quantitatively analyzed for a system driven by a heat source at 40 °C, which is lower than the existing literature studies. A 1-D transient analysis model was developed and an analytical study was conducted. Performance analysis was conducted according to pressure drop requirement, number of tubes inside the heat exchangers and reactors, and number of fins inside the reactor, and the optimal design point for each condition was suggested. The cooling capacity, coefficient of performance, specific cooling power at the optimal design point are 1100.6 W, 0.3, 45.7 W/kg respectively.