旋转压缩机在低温环境下的性能

IF 0.8 Q4 THERMODYNAMICS
S. Lowrey, G. Reboux
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引用次数: 2

摘要

小型旋转压缩机用于家用热泵电器,例如家用除湿机和热泵干衣机。制造商提供的压缩机性能曲线是基于在较高环境温度下的测试,有些情况下可高达35°C。这比压缩机工作的环境温度要高得多,例如,当压缩机安装在家用除湿机上时,它可以在低至10°C的环境温度下工作。我们开发了一种压缩机量热计,用于测试从商用家用除湿机中提取的小型R134a旋转压缩机,并使用它来测量压缩机性能参数,包括等熵和容积效率以及压缩机热损失分数。在10°C、15°C、20°C和25°C的固定相对湿度为70%的环境温度下进行了性能测试,以比较压缩机性能随环境温度的变化情况,并确定压缩机在制造商提供的性能范围之外的性能表现。结果表明,这些小型压缩机的等熵和容积效率对环境温度的变化相对不敏感,即使超出了制造商提供的性能范围。然而,在25°C环境和10°C环境下运行时,压缩机的热损失分数平均可从15%增加到30%。利用所得数据建立了一定环境温度下的压缩机子模型。我们展示了如何使用这些子模型来改进家用除湿机模型,使其在蒸发器结霜状态下在低环境条件下运行,并且在实验和模拟数据之间获得了良好的一致性。作者不知道国内除湿机模型设计在环境温度下工作在结霜制度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rotary Compressor Performance at Low Ambient Temperatures
Small rotary compressors are used in domestic heat pump appliances, for example, in domestic dehumidifiers and heat pump clothes dryers. Compressor performance curves provided by the manufacturer can be based on testing at relatively high ambient temperatures, in some cases as high as 35∘C. This can be much higher compared with the ambient temperature in which the compressor operates when, for example, it is installed in a domestic dehumidifier which can operate in ambient temperatures as low as 10∘C. We have developed a compressor calorimeter to test a small R134a rotary compressor extracted from a commercial domestic dehumidifier and use this to measure compressor performance parameters including the isentropic and volumetric efficiencies and the compressor heat loss fraction. The performance testing has been carried out at ambient temperatures 10∘C, 15∘C, 20∘C and 25∘C for a fixed relative humidity of 70% to compare how the compressor performance varies with the ambient temperature, and to determine how well the compressor performs outside of the performance envelope provided by the manufacturer. The results show that isentropic and volumetric efficiency of these small compressors is relatively insensitive to variation in ambient temperature, even outside of the performance envelope provided by the manufacturer. However, the compressor heat loss fraction can, on average, double from 15% to 30%, between operation at ambient 25∘C and ambient 10∘C. The data obtained in this work is used to construct compressor sub-models for certain ambient temperatures. We show how these sub-models can be used to improve a domestic dehumidifier model for operation at low ambient conditions within the evaporator frosting regime and good agreement is obtained between experimental and simulated data. The authors are not aware of a domestic dehumidifier model designed to work at ambient temperatures within the frosting regime.
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来源期刊
CiteScore
2.70
自引率
10.00%
发文量
0
期刊介绍: As the only international journal in the field of air-conditioning and refrigeration in Asia, IJACR reports researches on the equipments for controlling indoor environment and cooling/refrigeration. It includes broad range of applications and underlying theories including fluid dynamics, thermodynamics, heat transfer, and nano/bio-related technologies. In addition, it covers future energy technologies, such as fuel cell, wind turbine, solar cell/heat, geothermal energy and etc.
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