Composite adsorbents of CaCl sub(2) and sawdust prepared by carbonization for ammonia adsorption refrigeration

Composite adsorbents of CaCl sub(2) and sawdust prepared by carbonization for adsorption refrigeration with NH sub(3) as refrigerant are tested, and the effects of carbonization temperature on the sorption capacity and rate are analyzed. The results show that the amount of pores in the sawdust of the composite adsorbents carbonized, apart from the content of CaCl sub(2), is the most dominant factor influencing the NH sub(3) sorption on composite adsorbents. The optimum carbonization temperature is 700 degree C, which gives the maximal NH sub(3) sorption capacity as high as 0.774 kg of NH sub(3) per kg of the composite, and the specific cooling power is approximately between 338 and 869 W/kg with the cycle duration varying from 5 to 20 minutes. The present study demonstrates that the composite absorbent of CaCl sub(2) and sawdust prepared by carbonization is more promising and competitive for adsorption refrigeration application.