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Article

Effect of Refrigerant Flow Control on the Heating Performance of a Variable-Speed Heat Pump Operating at Low Outdoor Temperature

[+] Author and Article Information
Bong H. Kim

Automotive, Industrial, and Mechanical Engineering Department, Daegu University, Korea

Dennis L. O’Neal

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Sol. Energy Eng 127(2), 277-286 (Apr 25, 2005) (10 pages) doi:10.1115/1.1849224 History: Received April 07, 2004; Revised July 19, 2004; Online April 25, 2005
Copyright © 2005 by ASME
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References

Figures

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A schematic diagram of the test set-up
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Cross-sectional view of the electronic valve
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Determination of the optimum charge: Variations of both cooling and heating capacity as a function of refrigerant charge for the rated compressor speeds (47 and 65 Hz)
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Pressure-enthalpy diagrams for EEV with different opening angles (outdoor temperature=0°C, compressor speed=65 Hz)
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Heating capacity and EER versus compressor speed for the given outdoor temperature (0°C)
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Variation of refrigerant flow rate as a function of compressor speed for the given outdoor temperature (0°C)
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Pressure–enthalpy diagrams for different expansion devices with the compressor speed=65 Hz (indoor: 21/15.5°C, outdoor: 0°C with 50% relative humidity)
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Pressure–enthalpy diagrams for different outdoor temperatures when using the capillary tube (1400 mm): compressor speed=75 Hz
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Variation of refrigerant flow rate as a function of outdoor temperature for different compressor speeds when using the capillary tube
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Variation of the degree of superheat as a function of outdoor temperature for the given compressor speed (75 Hz)
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Variation of heating capacity as a function of outdoor temperature for different compressor speeds
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Variation of EER as a function of outdoor temperature for different compressor speeds

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