本文建立了汽机热泵系统的模型并基于有限时间热力学考虑汽机热泵系统内部不可逆和外部不可逆性对系统性能进行了分析研究.汽机热泵系统由不可逆汽机循环和不可逆压缩式热泵循环组成.分别对汽机侧和热泵的蒸发器与冷凝器进行了优化面积分配和优化时间分配研究,得到了系统热负荷与系统性能系数的数学关系.研究中引入两个不可逆参数RΔ、RΔS.算例研究显示内不可逆参数对汽机热泵系统的性能比外部不可逆因素有更大的影响.研究还发现热泵侧不可逆因素对系统的影响大于汽机侧不可逆因素对系统的影响.%In this paper, a model of heat pump driven by steam turbine is established and presents finite time thermo-dynamic analysis of the system considering both external as well as internal irreversibility.The system is considered as consisting of an irreversible heat engine and an irreversible heat pump.Optimization is made on both heat exchanger areas distribution and heat engine cycle and refrigeration cycle time distribution.An optimal relation between performance coefficient of the system and heating load is obtained.Two irreversible parameters RΔs, RΔs are introduced during the study.A detailed parametric study shows that internal irreversibility parameters have more drastic effect on performance reduction than any other external irreversibility parameter.It is also found that effects of the irreversible factors in the heat pump side is greater than the irreversible factors in the heat engine side on the system.
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