Effective thermal conductivity of expanded graphite–CaCl2 composite adsorbent for chemical adsorption chillers

This paper presents experimental data on the thermal conductivity for three types of adsorbent, namely, pure CaCl2 powder, simple composite adsorbent and consolidated composite adsorbent. The thermal conductivities were measured by the “hot wire method” at a fixed pressure and temperature under an ammonia atmosphere. Effective thermal conductivities of the expanded graphite–CaCl2 · nNH3 (n = 2, 4, 8) consolidated composite adsorbent are in the range of 7.05–9.2 W m−1 K−1, which are significant higher values than those of the powders bed of 0.3–0.4 W m−1 K−1. The obtained results show that the composite adsorbent thermal conductivity λ has a strong dependence on the bulk density, the weight fraction of expanded graphite and the ammoniated state of CaCl2.