复合冷凝过程综合能效的评价模型及算例

Evaluation Model and Example of Comprehensive Energy Efficiency of Compound Condensation Process

摘要: 目前，复合冷凝过程已经上升成为国家标准，而传统的经典热力学评价方法粗糙。为了精确地对系统进行能效评价和便于指导操作测试，引入国际上比较前沿的有限时间热力学分析方法。本文建立了卫生热水装置水温上升的连续数学模型，并在此基础上提出了离散的累积求和模型。并针对改造后的2600 W的风冷热泵，以全热回收模式为例，介绍了冷凝热回收率与综合能效系数的评价模型和测定方法。然后，通过实验结果与风冷热泵复合冷凝装置仿真结果进行了验证。结果表明：该评价方法简便，精度高。可以为该类热力系统的评价及测试提供参考。

Abstract: At present, the compound condensation process has become a national standard, but the traditional classical thermodynamic evaluation methods are rough. In order to accurately evaluate the energy efficiency of the system and guide the operation test, the international advanced finite time thermodynamic analysis method is introduced. In this paper, a continuous mathematical model of water temperature rise in sanitary hot water plants is established and a discrete cumulative summation model is proposed. Taking the total heat recovery model as an example, the evaluation model and assay method of the recovery rate of condensing heat and comprehensive energy efficiency coefficient are introduced for the modified 2600 W air-cooled heat pump. Then, the experimental results are verified with the simulation results of air-cooled heat pump compound condensing device. The results show that the method is simple and accurate. It can provide a reference for the evaluation and test of this kind of thermal system.