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Exergetic efficiency of high‐temperature‐lift chemical heat pump (CHP) based on CaO/CO 2 and CaO/H 2 O working pairs
Author(s) -
Arjmand Mehdi,
Liu Longcheng,
Neretnieks Ivars
Publication year - 2013
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.2918
Subject(s) - chemistry , thermodynamics , work (physics) , condenser (optics) , lift (data mining) , chemical reaction , heat pump , heat exchanger , organic chemistry , physics , light source , computer science , data mining , optics
SUMMARY The use of reversible chemical reactions in recuperation of heat has gained significant interest due to higher magnitude of reaction heat compared to that of the latent or sensible heat. To implement chemical reactions for upgrading heat, a chemical heat pump (CHP) may be used. A CHP uses a reversible chemical reaction where the forward and the reverse reactions take place at two different temperatures, thus allowing heat to be upgraded or degraded depending on the mode of operation. In this work, an exergetic efficiency model for a CHP operating in the temperature‐level amplification mode has been developed. The first law and the exergetic efficiencies are compared for two working pairs, namely, CaO/CO 2 and CaO/H 2 O for high‐temperature high‐lift CHPs. The exergetic efficiency increases for both working pairs with increase in task, T H , decrease in heat source, T M , and increase in condenser, T L , temperatures. It is also observed that the difference in reaction enthalpies and specific heats of the involving reactants affects the extent of increase or decrease in the exergetic efficiency of the CHP operating for temperature‐level amplification. Copyright © 2012 John Wiley & Sons, Ltd.