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PRESS RELEASE

Concept of a hybrid compression-adsorption heat pump cycle

 

Authors

Jubair A. Shamim, Gunjan Auti, Hibiki Kimura, Shubo Fei, Wei-Lun Hsu, Hirofumi Daiguji, Arun Majumdar

 

Summary

A heat pump can produce a large amount of thermal energy for low- to moderate-temperature heating and cooling from a small amount of energy input. Although vapor compression heat pumps (VCHPs) can achieve a high coefficient of performance (COP), the lack of eco-friendly fluorocarbon refrigerants is a serious problem. An adsorption heat pump is a heat-driven heat pump that does not use fluorocarbon refrigerants but is less compact and has higher installation costs. This perspective proposes a hybrid compression-adsorption heat pump (HCA-HP) cycle that circulates a mixture of CO2 and a porous metal-organic framework (MOF) in a VCHP system. Model calculations show that the MOF-CO2 HCA-HP cycle can release heat at 50% lower pressure than the transcritical CO2 HP cycle and that the COP can be improved by developing a pair of MOFs and gases with a step-shaped adsorption isotherm and a large heat of adsorption.

 

fig1

 

Cell Reports Physical Science: https://www.cell.com/cell-reports-physical-science/fulltext/S2666-3864(22)00433-7