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When compared with LiBr/H 2 O, an absorption refrigeration cycle using CaCl 2 /H 2 O as the working pair needs a lower driving heat source temperature, that is, CaCl 2 /H 2 O has a better refrigeration characteristic. However, the crystallization temperature of CaCl 2 /H 2 O solution is too high and its absorption ability is not high enough to achieve an evaporation temperature of 5 °C or lower. CaCl 2 -LiNO 3 -KNO 3 (15.5:5:1)/H 2 O was proposed and its crystallization temperature, saturated vapor pressure, density, viscosity, specific heat capacity, specific entropy, and specific enthalpy were measured to retain the refrigeration characteristic of CaCl 2 /H 2 O and solve its problems. Under the same conditions, the generation temperature for an absorption refrigeration cycle with CaCl 2 -LiNO 3 -KNO 3 (15.5:5:1)/H 2 O was 7.0 °C lower than that with LiBr/H 2 O. Moreover, the cycle's COP and exergy efficiency with CaCl 2 -LiNO 3 -KNO 3 (15.5:5:1)/H 2 O were approximately 0.04 and 0.06 higher than those with LiBr/H 2 O, respectively. The corrosion rates of carbon steel and copper for the proposed working pair were 14.31 μm∙y -1 and 2.04 μm∙y -1 at 80 °C and pH 9.7, respectively, which were low enough for engineering applications.

Study on a Quaternary Working Pair of CaCl2-LiNO3-KNO3/H2O for an Absorption Refrigeration Cycle