Experimental studies on a novel chemical heat pump dryer using a gas-solidreaction

Citation
H. Ogura et al., Experimental studies on a novel chemical heat pump dryer using a gas-solidreaction, DRY TECHNOL, 19(7), 2001, pp. 1461-1477
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
DRYING TECHNOLOGY
ISSN journal
0737-3937 → ACNP
Volume
19
Issue
7
Year of publication
2001
Pages
1461 - 1477
Database
ISI
SICI code
0737-3937(2001)19:7<1461:ESOANC>2.0.ZU;2-Q
Abstract
The authors have been studying Chemical Heat Pumps (CHP) from the viewpoint s of energy saving and environmental impact. The CHP can store thermal ener gy in the form of chemical energy by an endothermic reaction, and release i t at various temperature levels during heat demand periods by exo/endotherm ic reactions. The authors have proposed in an earlier study a novel chemica l heat pump (CHP) system for environmentally-friendly effective utilization of thermal energy in drying as a chemical heat pump dryer (CHPD). In this exploratory study, we test the effectiveness of operating the proposed CHPD s experimentally. Basic experiments on the CHPDs such as hot dry air produc tion for convective drying are performed on lab-scale CHPD apparatuses usin g gas-solid reactions in calcium oxide/calcium hydroxide reactant beds. The proposed CHPDs are found to produce hot air by CHP operation for drying. T he temperature levels of the produced hot air and the reaction rates/conver sions are as good as in the case of hot water supply system using basically same CHP operation. The cold heat for air dehumidification is also found t o be generated/recovered by the same CHPD system. The generated heat amount s can be increased by changing the operating conditions although the heat r ecovery must be enhanced for practical application of CHPDs.