土壤源热泵系统的分析

EXERGY ANALYSIS OF GSHP

对组成土壤源热泵系统的3个回路以及整个系统的制冷和制热工况进行了全面的分析,分别给出了它们的损失、效率、损率、损系数以及热力学完善度的表达式。结果表明:在对系统进行分析时,必须将这几个指标结合起来使用。在整个系统中,损率最大的部件是压缩机,而效率与热力学完善度最低的却是土壤热交换器。因此,压缩机和土壤热交换器是整个系统改进的首要对象。

A comprehensive exergy analysis was carried out for three circuits and whole system of a ground source heat pump （GSHP） at the refrigeration and heating conditions. The analytical formulas of exergy loss, exergy efficiency, exergy loss rate, exergy loss coefficient and thermodynamic perfect degree were derived, respectively. The results show that these exergy indexes should be used synthetically, and the maximum exergy loss rate in the whole system is located in the compressor, while the location of minimum exergy efficiency and thermodynamic perfect degree is the ground heat exchanger. Therefor, the compressor and the ground heat exchanger should be improved primarily.