HEAT-TRANSFER EFFECT ON THE SPECIFIC HEATING LOAD OF HEAT-PUMPS

The maximum possible specific heating load that can be obtained from t wo-heat-reservoir heat pumps with a set of high-temperature heat sinks and low-temperature heat sources is analyzed. The heat pumps consider ed in this paper include (1) externally and internally reversible, (2) externally irreversible and internally reversible, (3) externally rev ersible and internally irreversible and (4) externally and internally irreversible heat pumps. The irreversibilities are assumed to be cause d by heat transfer only. The specific heating load, defined as the hea ting load per unit total heat exchanger surface area, is adopted as th e objective function for the heat pump performance analysis in this pa per.