Abstract
Adsorption heat pumps (AHPs) driven by solar energy or waste heat outperform traditional vapor compression heat pumps, because they greatly reduce the primary energy consumption and greenhouse emissions. However, the low coefficient of performance (COP) limits the wide application of AHPs. It is known that adsorbent-based working pairs with stepwise adsorption isotherm are favorable for the COP of AHPs. Nevertheless, the optimal step locations that are the favorable steps in adsorption isotherms of working pairs for COP under adsorption heating, cooling and ice making working conditions have not been explored. In this work, the correlations between the optimal step locations, working conditions and COP was investigated by theoretical analysis and mathematic modelling based on ideal stepwise adsorption isotherms. It was found the predicted optimal step locations for adsorption heating was smaller than those for adsorption cooling and ice making. It was also revealed that the evaporation temperature was more evidently correlated with the optimal step locations as well as COP. Moreover, it is favorable for COP when the loading average enthalpy of adsorption is close to the enthalpy of vaporization of working fluids. This study may guide the choosing and designing of high-performing working pairs for AHPs under various working conditions.
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