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Effect of saturation temperature change due to pressure loss of refrigerants on heat transfer capacity of heat exchanger.

Number: pap. 2201

Author(s) : LEE H., JEONG J. H.

Summary

Heat exchanger is an essential component in the HVAC&R applications. The heat exchanger development methods are divided into simulation and experiment. Simulation is often used by researchers because it can save a lot of time and money over experimental method. However, it is difficult to model all physical phenomena in simulation. Some phenomena are simulated with ideal assumptions based on experience. To analyze an ideal heat exchanger without pressure loss of the refrigerant, the saturation temperature of the heat exchanger is assumed to be constant. Whereas, saturated temperature drop occurs due to the pressure loss of the refrigerant in a real case scenario which affects the heat transfer capacity of the heat exchanger. In this study, a theoretical method to evaluate the effect of saturated pressure loss of refrigerant on the heat transfer capacity in heat exchanger was proposed and analyzed. The proposed method was verified by simulation. R134a, R410A, R600a, R32, and R1234yf were selected as refrigerants for analysis which are used in air conditioners and refrigerators. As a result, the heat transfer capacity ratio of the cycle using R134a showed 96.11% under the condensing condition of 15 kPa pressure loss, and 108.97% and 123.17% for air conditioner and refrigerator evaporating conditions, respectively. Moreover, R600a showed the greatest performance change, and R32 showed the smallest performance change.

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Pages: 9

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Details

  • Original title: Effect of saturation temperature change due to pressure loss of refrigerants on heat transfer capacity of heat exchanger.
  • Record ID : 30024444
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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