中国北方城镇供暖能耗占全国城镇建筑总能耗的40%左右。在传统集中供热系统中,较高温的一次网热水(130℃)通过小区热力站处的换热器,将热量传递给二次网热水(60℃/45℃),温度降低后(70℃)回到热源。本文引入热机和热泵,并考虑环境因素,构建了新的调热系统并建立其理想热力模型。应用极值原理优化该热力系统,结果表明当一次网回水温度降至环境温度时,系统的供热能力最大,此时供热能力相对吸收式换热系统可能增大40%。 The heating energy consumption of cities and towns in northern China accounts for about 40% of the total energy consumption of urban construction in China. In the traditional central heating system, the hotter net hot water (130 ℃) passes through the heat exchanger at the district heat station to transfer the heat to the second network hot water (60 ℃ / 45 ℃) 70 ℃) back to the heat source. In this paper, the introduction of heat engine and heat pump, and taking into account environmental factors, build a new heat transfer system and establish its ideal thermodynamic model. The extreme value principle is used to optimize the thermodynamic system. The results show that when the primary return water temperature drops to the ambient temperature, the heating capacity of the system is the largest, and the heating capacity may increase by 40% compared with that of the absorption heat exchange system.