Patent ID: 7037360

Claim:
A heat utilization system of utilizing the heat of adsorption generated while an adsorbent adsorbs an adsorbate and/or the latent heat of vaporization generated while the adsorbate vaporizes and is adsorbed to the adsorbent, wherein the adsorbent is zeolite, and (a) the framework density of the zeolite falls between 10 T/nm 3 and 18 T/nm 3 , and (b) on the adsorption isotherm thereof measured at 55° C., the adsorbate adsorption amount by the zeolite is at most 0.12 g/g at a relative vapor pressure of 0.02 and is at least 0.13 g/g at a relative vapor pressure of 0.1, and the zeolite has a relative vapor pressure region to give an adsorbate adsorption amount change of at least 0.08 g/g when the relative vapor pressure thereof has changed by 0.05 in a range of the relative vapor pressure thereof of from 0.02 to 0.1.