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基于理论与实验的变频干衣机烘干性能及预测方法研究
曹正1, 高科科2, 薛维超3
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(1.美的集团中央研究院;2.美的集团中央研究院动力学及控制实验室;3.美的集团中央研究院热技术研究所)
摘要:
热泵干衣机烘干过程,具有强耦合(冷媒侧的热力循环与空气侧的衣物干燥循环)、时变性(系统工况状态随烘干时间变化)、集成性(有限空间下集成蒸发器、冷凝器、风机、压缩机等)的复杂特性,为理论分析热泵干衣机系统参数对烘干性能的影响研究带来了很大难度。本文基于一定简化,详细分析了不同压缩机能力,不同风机风量对热泵干衣机单位能耗除湿量SMER、单位时间除湿量MER的影响。 研究发现:对于闭式热泵干衣机,在同一风量下,冷凝器出风温度在20到80度,蒸发器出风温度在10到50度的分析范围内,干衣机SMER随着冷凝器出风,蒸发器出风温度的升高均先增大再降低。对于本例分析的热泵干衣机,半载5kg衣服负载,理论计算其存在最优的冷凝器出风温度53度、蒸发器出风27度,使得干衣机SMER最大。其最优的冷凝器出风,蒸发器出风温度与热泵系统COP及滚筒内衣物的传热传质有关;在同一蒸发器出风、冷凝器出风温度下,系统风量在0.02~0.08kg/s的分析范围内,单位能耗除湿量SMER随着风量的增大先增大再降低,存在最优的工作风量0.047kg/s使得干衣机SMER最大。其最优风量与滚筒功率及整机风阻特性有关;并根据干衣机性能测试标准,通过实验验证了理论分析结果与实验测试基本一致,其最大SMER对应的风量与工况温度也与理论分析接近。其研究方法与结论可为热泵干衣机系统设计与优化提供理论指导。
关键词:  热泵干衣机  烘干性能  蒸发温度  冷凝温度  压缩机  
DOI:
投稿时间:2023-09-13  修订日期:2023-11-09   录用日期:2024-01-29
基金项目:
Study on Drying Performance and Prediction Model of Heat Pump Clothes Dryer Based on Theory and Experiment
Abstract:
The drying process of heat pump clothes dryer (HPCD) has complex characteristics for strong coupling (the thermal cycle of the refrigerant side is coupled with the drying cycle of the air side), time-varying (the system operating parameters change with drying time), and integration (limited space integrating evaporator, condenser, fan, compressor, etc.), which brings great difficulty to theoretical analysis of drying performance of HPCD. Based on certain simplifications, this paper analyzes the effects of different compressor capacities and fan airflows on the moisture extraction rate per unit time (MER) and moisture extraction rate per energy consumption (SMER) of the HPCD. The study found that under the same airflow, the condenser discharge air temperature within the analysis range of 20 to 80 degrees, the evaporator discharge air temperature within the analysis range of 10 to 50degrees, the SMER increases first and then decreases with the condenser discharge air temperature and evaporator discharge air temperature, and for the HPCD analyzed in this paper, when drying half load 5kg clothes, by theoretical calculation, there is an optimal condenser discharge air temperature 53 degrees and evaporator discharge air temperature 27degrees that maximizes the SMER of the HPCD, and the optimal evaporator discharge and condenser discharge air temperature is related to the COP of heat pump system and the mass and heat transfer capacity of air with clothes. Under the same evaporator discharge and condenser discharge temperatures, the airflow within the analysis range of 0.02~0.08kg/s, the SMER first increases and then decreases with the airflow, and there is an optimal working airflow 0.047kg/s that maximizes the SMER of the HPCD, and the optimal airflow is related to the drum power and the clothes dryer airflow resistance characteristic; And according to methods for measuring the performance of tumble dryers for household use, through testing, it was verified that the theoretical analysis results were consistent with the experimental tests. The research method and conclusion can provide theoretical guidance for the design and optimization of HPCD.
Key words:  heat pump clothes dryer(HPCD)  drying performance  evaporating temperature  condensing temperature  compressor

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