TY - JOUR
T1 - Operational envelope and performance enhancement of a two-bed adsorption cooling system
AU - Yagnamurthy, Sai
AU - Rakshit, Dibakar
AU - Jain, Sanjeev
AU - Saha, Bidyut Baran
N1 - Funding Information:
The authors would like to thank the Ministry of Human Resource Development, Government of India, for providing the necessary travel support to facilitate part of the study under the Scheme for Promotion of Academic and Research Collaboration (SPARC).
Publisher Copyright:
© 2021
PY - 2021/8
Y1 - 2021/8
N2 - Along with the measures to improve the design of the adsorption cooling systems, the operating strategy selection plays an equally important role in their performance enhancement. Though several strategies such as heat recovery, mass recovery, multi-staging, etc., have been reported in the literature, their implementation in the more popular small-scale two-bed systems has not been given due attention. The present study highlights the performance enhancement of a two-bed single-stage silica gel-water adsorption cooling system through novel interventions in the operating cycle. A facility has been developed for testing a 10 kW water-cooled adsorption chiller. Passive heat recovery and two-stage operational strategies have been proposed for the enhancement of performance and operational envelopes through modifications in the chiller's valves sequencing. An improvement of 23–42% in coefficient of performance (COP) is observed with an optimized passive heat recovery strategy, while maintaining the water level in the hot water tank. Two kinds of two-stage operations viz., conventional two-stage and reheat two-stage, show potential for performance improvement under extreme conditions, resulting in an operational envelope enhancement up to 56%. A theoretical approach based on the thermodynamic analysis of adsorbent limits has been presented to assess the maximum desorption temperature limits.
AB - Along with the measures to improve the design of the adsorption cooling systems, the operating strategy selection plays an equally important role in their performance enhancement. Though several strategies such as heat recovery, mass recovery, multi-staging, etc., have been reported in the literature, their implementation in the more popular small-scale two-bed systems has not been given due attention. The present study highlights the performance enhancement of a two-bed single-stage silica gel-water adsorption cooling system through novel interventions in the operating cycle. A facility has been developed for testing a 10 kW water-cooled adsorption chiller. Passive heat recovery and two-stage operational strategies have been proposed for the enhancement of performance and operational envelopes through modifications in the chiller's valves sequencing. An improvement of 23–42% in coefficient of performance (COP) is observed with an optimized passive heat recovery strategy, while maintaining the water level in the hot water tank. Two kinds of two-stage operations viz., conventional two-stage and reheat two-stage, show potential for performance improvement under extreme conditions, resulting in an operational envelope enhancement up to 56%. A theoretical approach based on the thermodynamic analysis of adsorbent limits has been presented to assess the maximum desorption temperature limits.
UR - http://www.scopus.com/inward/record.url?scp=85107886719&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85107886719&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2021.117181
DO - 10.1016/j.applthermaleng.2021.117181
M3 - Article
AN - SCOPUS:85107886719
VL - 195
JO - Journal of Heat Recovery Systems
JF - Journal of Heat Recovery Systems
SN - 1359-4311
M1 - 117181
ER -