Adsorption refrigeration- : An efficient way to make good use of waste heat and solar energy

An overview of developments in adsorption refrigeration systems towards a sustainable way of cooling

A review of adsorbents and adsorbates in solid–vapour adsorption heat pump systems

A review of chemical heat pumps, thermodynamic cycles and thermal energy storage technologies for low grade heat utilisation

As one kind of environmentally friendly refrigeration, the adsorption refrigeration has attracted many attentions in resent decades. This paper introduces the researches of adsorption refrigeration systems with the commonly used working pairs, advanced adsorption cycles, heat and mass transfer enhancement and attempts of adsorption refrigeration applications. Poor heat and mass transfer problem is a bottleneck to prevent the improvements of the adsorption refrigeration technique. Two ways to enhance the heat and mass transfer are discussed in this paper. The adsorption deterioration of adsorbent, another obstacle to physical adsorption refrigeration applications, is also pointed out. And the possible reasons and the possible methods are analyzed.

A review on adsorption refrigeration technology and adsorption deterioration in physical adsorption systems

The low thermal conductivity of the solid sorbents is one of the major drawbacks of the sorption heat pumps development. A better thermal transfer in the adsorber fixed beds is required to obtain a decreased time of the processing cycles and thus a reduced adsorber size per unit of power. Small improvements in the parameters of thermal transfer were obtained with unconsolidated porous mixtures such as bimodal mixtures and metallic foams. New consolidated materials made of metallic foam and zeolite were developed. The measurements of the thermal conductivity and of the wall heat transfer coefficient show a great improvement in the thermal transfer quality. Resistances to mass transfer appear but they are consistent with the adsorption heat pump process. With this type of composite material it seems possible to reduce the adsorber size by a factor from 5 to 10.

J.B. Chalfen

Papers

Heat transfer intensification in fixed bed adsorbers