Wang [8] developed a novel two-stage adsorption freezing machine, which is powered by the heat
source with the temperature below 100°C. The composite adsorbents of CaCl2 and BaCl2 developed by the matrix of
expanded natural graphite were chosen as adsorbents. The experimental results showed that the optimal coefficient
of performance (COP) and specific cooling power (SCP) at 15 °C refrigeration are 0.127 and 100W.kg-1,
respectively. COP and SCP increased with the increasing heat source temperature and decreased with the decreasing
evaporating temperature.