Numerical Assessment of a Dynamic Daily Heating Unit Using Both Solar Collector and Heat Pump Coupled in a Dynamic Working

Abstract

Solar energy is commonly used in heating systems as unconven-tional heat source. Assuming that in low solar radiation day, temperature obtained from collectors haven't desired value for space heating, presented paper reveal the solution of a heat pump system, to satisfy heating demand, using the heat accumulated in active collectors period. The system considered work in both hypotheses, firstly in two distinct periods, charging and discharging of accumulated energy, and secondly in a mixt activity when the heat pump can start working in same time with heat accumulation due to collectors running. Day parameters, in terms of solar radiation and external ambient temperature, will be used to simulate the system functioning and different results are presented to reveal the working conditions, the energy balance between solar and electrical energy used by heat pump and advantages of such system. High COP CD for 2 March was obtained, with values greater than 7.85 for 120 L/m 2 specific volume.