日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Heat exchange ability of zeolitic water is now interested in many workers. The big total hydration heat of some zeolites enables potential applications as the zeolite-water heat pump system for effective use of low temperature heat sources such as waste heats and the solar energy. The thermodynamic background of the ability has been clarified in view of the low entropy state of the zeolitic water. The state of zeolitic water is discussed to be analogous to the states of materials at very low temperature which contributes to improve the Carnot efficiency of any thermal engines.