Annual performances of reversible air source heat pumps for space conditioning

Abstract The paper presents the results obtained by a numerical simulation of a heating and cooling system based on a reversible air-to-water electric heat pump and electric resistances as back-up. According to the procedure suggested by the current standards EN 14825 and UNI/TS 11300-4, by using the bin method the influence of outdoor conditions and of the typology of heat pump installed has been investigated by determining the value assumed by the seasonal coefficient of performance (SCOP on ), the seasonal efficiency ratio (SEER) and the annual performance factor ( APF ). The numerical results allow discussing the rules for an optimal heat pump sizing in a fixed site.