储能科学与技术

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基于中间工况寻优的复叠式高温热泵蒸汽系统性能研究

姜志鹏1,2(), 李帅旗1,2(), 林文野1,2, 宋文吉1,2, 冯自平1,2   

  1. 1.中国科学技术大学 能源科学与技术学院，合肥 230027
    2.中国科学院广州能源研究所，广州 510640
  • 收稿日期:2025-03-27 修回日期:2025-04-22
  • 通讯作者: 李帅旗 E-mail:jiangzhipeng@mail.ustc.edu.cn;lisq@ms.giec.ac.cn
  • 作者简介:姜志鹏（2000—），男，硕士研究生，研究方向高温热泵，E-mail：jiangzhipeng@mail.ustc.edu.cn
  • 基金资助:
    广州市重点研发项目(2025B03J0023)

Research on the performance of cascade high-temperature heat pump steam system based on intermediate working condition optimization

Zhipeng JIANG1,2(), Shuaiqi LI1,2(), Wenye LIN1,2, Wenji SONG1,2, Ziping FENG1,2   

  1. 1.School of Energy Science and Engineering, University of Science and Technology of China, Hefei 510640, China
    2.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2025-03-27 Revised:2025-04-22
  • Contact: Shuaiqi LI E-mail:jiangzhipeng@mail.ustc.edu.cn;lisq@ms.giec.ac.cn

摘要：

本文提出复叠式高温热泵与蒸汽压缩机耦合的蒸汽制备系统，采用R134a、R245fa及R718分别作为低温级、高温级和蒸汽级工质，以中间工况动态寻优为基础探究环境温度15~40℃与蒸汽出口温度140至170℃的热力性能，并搭建实验平台对仿真数据进行验证。研究表明：基于动态寻优模型发现随着中间蒸汽温度上升，喷液率下降，最佳低温级冷凝温度上升。蒸汽出口温度为170℃，环境温度由-15上升到40℃，系统COP从1.628上升至1.914。环境温度为20℃，蒸汽出口温度由140℃上升到170℃，系统COP从1.915下降至1.657，蒸汽产量也从0.856t/h上升至1.222t/h。通过实验发现在蒸汽出口温度为170℃和环境温度为23~27℃的工况下，系统COP较理论值下降3%~5%，总功率较理论值低8％~12％。对仿真和试验的性能指标进行误差分析，最大误差集中于复叠热泵功率（13.29%）与总功率（10.01%）。

关键词: 高温热泵蒸汽系统, 中间工况寻优, 启动过程, 性能研究, 误差分析

Abstract:

This paper presents a steam generation system that integrates a cascade high-temperature heat pump with a vapor compression machine, using R134a, R245fa, and R718 as working fluids for the low-temperature, high-temperature, and steam stages, respectively. Based on dynamic optimization of intermediate conditions, the thermodynamic performance is investigated for environmental temperatures ranging from 15℃ to 40℃ and steam outlet temperatures from 140℃ to 170℃. An experimental platform is constructed to validate the simulation data. The study shows that, based on the dynamic optimization model, as the intermediate steam temperature increases, the spray rate decreases, and the optimal low-temperature stage condensation temperature increases. At a steam outlet temperature of 170℃, as the environmental temperature rises from -15℃ to 40℃, the system COP increases from 1.628 to 1.914. At an environmental temperature of 20℃, as the steam outlet temperature increases from 140℃ to 170℃, the system COP decreases from 1.915 to 1.657, while the steam output increases from 0.856 t/h to 1.222 t/h. Experimental results show that under conditions with a steam outlet temperature of 170℃ and environmental temperatures between 23℃ and 27℃, the system COP is 3%–5% lower than the theoretical value, and the total power is 8%–12% lower than the theoretical value. Error analysis of the simulation and experimental performance indicators reveals that the largest errors are concentrated in the cascade heat pump power (13.29%) and total power (10.01%).

Key words: high-temperature heat pump steam system, Optimization of intermediate working conditions, start-up process, performance studies, Error analysis

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