王涛,马家豪,金听祥.闭式跨临界CO2热泵烘干系统最优工况研究[J].包装工程,2024,45(5):254-262.
WANG Tao,MA Jiahao,JIN Tingxiang.Optimal Working Conditions of Closed Transcritical CO2 Heat Pump Drying System[J].Packaging Engineering,2024,45(5):254-262. |
| 闭式跨临界CO2热泵烘干系统最优工况研究 |
| Optimal Working Conditions of Closed Transcritical CO2 Heat Pump Drying System |
| 投稿时间：2023-04-28 |
| DOI：10.19554/j.cnki.1001-3563.2024.05.031 |
| 中文关键词: 热泵烘干 空气闭式循环 跨临界CO2系统 能效分析 |
| 英文关键词: heat pump drying closed drying cycle transcritical CO2 system energy efficiency analysis |
| 基金项目:河南省科技攻关项目(222102320075);河南省研究生教育创新培养基地项目(YJS2021JD05) |
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| 中文摘要: |
| 目的 对跨临界CO2热泵驱动的闭式干燥系统展开理论研究，得到CO2闭式热泵中最优工况的计算方法和原理。方法 通过建立CO2循环与空气循环热力学耦合的数学模型，计算干燥循环中空气的温度、焓值、相对湿度、含湿量，以及跨临界CO2热泵系统中工质的温度、压力、焓值等参数。通过调整冷凝干燥后空气温度，以热泵烘干系统的COP为评价依据，探究空气循环与CO2热泵循环的耦合机理。结果 获得了CO2循环系统最优排气压力随闭式空气循环系统在不同工况下的变化规律，并基于所建立的计算程序，获得了典型工艺参数下的热泵系统的热力学参数，为关键设备(风机、换热器、压缩机等)选型及系统控制方法提供了理论依据。结论 研究表明，在CO2热泵冷却器出口状态为临界状态时，系统的COP达到最优。 |
| 英文摘要: |
| The work aims to conduct a theoretical study on the closed drying system powered by transcritical CO2 heat pump and obtain the method and principle of calculating the optimal working conditions of CO2 closed heat pump. A mathematical model of thermodynamic couple between CO2 cycle and air cycle was established. Based on the model, the temperature, enthalpy, relative humidity and moisture content of air in the drying cycle were calculated and the temperature, pressure and enthalpy of working medium in transcritical CO2 heat pump system were figured out. The coupling mechanism between air cycle and CO2 heat pump cycle was explored by varying the air temperature after condensation and drying and taking COP in the heat pump drying system as the evaluation basis. The optimal CO2 discharge pressure in the closed drying system under different working conditions was obtained. Based on the established calculation program, the thermodynamic parameters of heat pump system under typical process parameters were obtained, providing a theoretical basis for the selection of key equipment (fans, heat exchangers, compressors, etc.) and system control methods. The research shows that the COP of the system is optimal when the outlet of CO2 heat pump cooler is at critical state. |
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