Recently

a CaCl2-BaCl2-NH3 chemisorption freezing cycle driven by a low-temperature heat source has drawn an increasing amount of attention. To develop a working pair with a more desirable performance than CaCl2-BaCl2-NH3

working pairs of CaCl2-NaBr-NH3

SrCl2-BaCl2-NH3

and SrCl2-NH4Cl-NH3 were investigated and compared. Most composite adsorbents were developed with a novel matrix of expanded natural graphite treated with sulfuric acid (ENG-TSA)

leaving one serial with expanded natural graphite (ENG) for comparison. For SrCl2-NH4Cl-NH3 and CaCl2-NaBr-NH3

experimental results show that the maximum adsorption quantities are 95.4% and 88.6% of the theoretical values

respectively. Simulation results indicate that the best results are obtained from CaCl2-NaBr-NH3

and its specific cooling power (SCP) and coefficient of performance (COP) are as high as 260.74 W/kg and 0.285

respectively

which are 15.1% and 5.6% better than the values for CaCl2-BaCl2-NH3. It is also noted that

for different working pairs

the COP

cooling capacity

and SCP range from 0.215 to 0.285

2 to 3.65 kW

and 161.4 to 260.74 W/kg

respectively. Comparisons also show that the ENG-TSA matrix effectively improves the SCP. For example

the SCP of CaCl2-BaCl2-NH3 is improved by 40.2%

when compared with a working pair with the ENG matrix.