汽机热泵系统热力学分析与运行优化

建立了汽机热泵系统的内可逆数学模型,并基于有限时间热力学对系统性能进行了分析研究.汽机热泵系统由内可逆汽机循环和内可逆压缩式热泵循环组成.在动力部分保持一定的输出功率和热泵部分保持一定的制热率的前提下,以损失最小为优化目标函数进行优化研究,得到了系统运行参数、汽机效率、热泵cop和系统性能系数随无因次输出功率和无因次制热率的变化关系.算例研究显示动力运行参数随输出功率趋于线性变化,热泵cop的变化明显,系统性能系数随输出功率和热泵制热率的增大均增加.优化结果可为汽机热泵系统运行提供指导.

Thermodynamic analysis and operation optimization of heat pump system driven by steam turbine

In this paper,a mathematical model of an internal endoreversible heat pump system driven by steam turbine was established and the performance of the system was analyzed based on finite-time thermodynamics.System was considered as consisting of a heat engine between and a heat pump system.On the conditions of maintain a certain power output in power cycle and maintain a certain heating rate in heat pump cycle,a optimization research was carried out by using minimum loss of exergy as the optimal objective function,an optimal relation between operating parameters of the system,turbine efficiency,cop of the heat pump,performance coefficient of the system and the dimensionless power output,the dimensionless heating rate was obtained.A detailed parametric study showed that the operating parameters of the power tends to be linear,cop of the heat pump changes significantly,performance coefficient of the system increases with the increasing of output power and heat pump heating rate.Optimization results could provide guidance for the operation of the heat pump system driven by steam turbine.