Energy and exergy analysis of heat transformers with thermal sources and sinks of finite capacity [heat pumps]

In a previous paper, heat transformers with thermal sources and sinks of infinite capacity were dealt with, as is generally done in literature. However, the hypothesis of infinite capacity is never satisfied with exactitude and sometimes is very far from reality. Thus, in this paper, energy and exergy analysis of some kinds of heat transformers with thermal sources and sinks of finite capacity are considered. Obviously the obtained results include those of the previous paper as a particular case