Experiments on a cascaded R11-R12 vapour compression system for cogeneration of heat and cold

A vapour compression heat pump (VCHP) working with R11 and a vapour compression refrigeration system (VCRS) operating with R12 are cascaded to produce heating and cooling effects simultaneously. Commercial refrigerant compressors normally used for cooling duty are employed. Experiments show that R11 condensing temperatures in the range of 65-95°C could be achieved corresponding to which the R12 evaporating temperatures varied from -2 to +8°C. Overall COPs of 1.2-1.7 are obtained while the exergetic efficiencies ranged from 10 to 15%. © 1985.