Abstract:

Calcium chloride was respectively added in calcium sulphate and cement with a mass fraction of 20% to produce two new working pairs for adsorption refrigeration, with CaCl₂ as the adsorbent and with NH₃ as the refrigerant. Then, the refrigeration characteristics of the working pairs were experimentally investigated. The results show that temperature is the control factor of the refrigeration process, and that, at 110 ℃, the refrigeration capacity per unit adsorbent of CaCl₂ /CaSO₄ is 1.48 times that of CaCl₂  and 1.96 times that of calcium chloride/cement. More-over, from the determination of specific surface area and pore structure of the adsorbents, it is found that the composite CaCl₂ /CaSO₄adsorbent maintains good pore structure and is of excellent refrigeration capacity.

Key words: calcium chloride, composite adsorbent, adsorption refrigeration, adsorption isotherm, specific surface area