Accurate estimation of the isosteric heat of adsorption is mandatory for a good modeling of adsorption
processes. In this paper a thermodynamic formalism on adsorbed phase volume which is a function of
adsorption pressure and temperature has been proposed for the precise estimation of the isosteric heat
of adsorption. The estimated isosteric heat of adsorption using the new correlation has been compared
with measured values of prudently selected several adsorbent-refrigerant pairs from open literature.
Results showed that the proposed isosteric heat of adsorption correlation fits the experimentally measured
values better than the Clausius-Clapeyron equation.