Studies On Heat And Mass Transfer Mechanism Of Solid Adsorption Refrigerating System

Because of its advantages of less environmental hazard and fully use of exhaust heat, adsorption refrigerating system has a wide range of potential application in industry. The purpose of this study is to investigate the heat and mass transfer performances and its thermodynamic mechanism of solid adsorption refrigerating system using CaCl2 as adsorbent and NH3 as refrigerant. A numerical model based on non-equilibrium thermodynamic theory was established. The total rate of entropy-production and the flux of mass transfer under different parameters have been obtained and disscussed. The Onsager Reciprocal Relations were also applied to analyse the coupling ralation of thermodynamical flux and force. The conclusions of this work show that the thermodynamic process in adsorption bed is decided by the coupling effect of the heat and mass transfer, furthermore, mass transfer is decided by heat transfer. Increasing the coefficients of heat transfer and heat conductivity, decreasing the contact thermal resistance can raise the refrigeration power so as to improve the performances of the adsorption refrigerating system. The conclusions in this paper may be helpful for the engineering application.