Economics at your fingertips  

Pressure boost thermochemical sorption heat pump cycle

Peng Gao, Liang-Liang Shao and Chun-Lu Zhang

Energy, 2019, vol. 169, issue C, 1090-1100

Abstract: Drying is a common process in industries and usually discharges much waste heat. Heat pump is an energy efficient approach to upgrading waste heat to a higher drying temperature. In this paper, a novel pressure boost thermochemical sorption heat pump (TSHP) is proposed. Different from existing salt/ammonia heat pump cycles, a compressor is installed between two reactors to drive the cycle so that only one sorbent is needed in the cycle and the exothermic process becomes continuous. Thermodynamic analysis shows that when desorption and sorption temperatures are 70 °C and 120 °C, the COP (coefficient of performance) of the new cycle with working pair SrCl2/NH3 is 6.5, which is remarkably higher than that of conventional vapor compression heat pump (VCHP) cycle under same operating conditions. Furthermore, for higher temperature rise, a hybrid cascade heat pump cycle is proposed as well. The VCHP cycle with refrigerant R134a is selected as the low stage cycle, while the TSHP cycle with sorbent SrCl2 is chosen as the high stage cycle. For the evaporating temperature 30 °C and sorption temperature 120 °C, the cascade cycle COP is 2.4, relative to 2.0 COP of conventional vapor compression cascade heat pump cycle.

Keywords: Chemical sorption heat pump cycle; Vapor compression; Cascade cycle; Thermodynamic analysis (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: Track citations by RSS feed

Downloads: (external link)
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link:

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Dana Niculescu ().

Page updated 2019-05-11
Handle: RePEc:eee:energy:v:169:y:2019:i:c:p:1090-1100