Community Research and Development Information Service - CORDIS


The use of an endothermic solution in absorption heat pumps should lead to an increase in the value of the COP and to a reduction in the cooling load in the absorber. For a given heat pump duty the heat required in the generator would be reduced; and in the case of solar heating a smaller collector area would be required. The aims of the project are to investigate the feasibility of using an endothermic refrigerant - absorbent system in an absorption heat pump, and to evaluate the system. An earlier literature study of physicochemical properties having led to the selection of potassium thiocyanate (KCNSO) - water for further study, heat capacity and vapour pressure have here been measured for KCNS - water solutions and an enthalpy - concentration chart for the system constructed. Further theoretical considerations suggest that aqueous endothermic solutions exhibit only small negative deviations from Raoult's law; and consequent adverse effects on the operation of a heat pump are to be expected. Tests on a commercial absorption heat pump with KCNS - water solutions support this conclusion.

Additional information

Bibliographic Reference: EUR 10151 EN (1985) MF, 67 P., BFR 150, BLOW-UP COPY BFR 335, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top