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The effect of refrigerant flowrate control of outdoor heat exchanger.

Number: pap. n. R23, 2426

Author(s) : LEE H., KIM H., SA Y., et al.

Summary

VRF system has generally large size outdoor unit which can cover big capacity. Large size outdoor heat exchanger requires many refrigerant paths, because of pressure drop during evaporation and condensation. The increase of refrigerant path number may cause mal-distribution of refrigerant. Especially, heat exchangers which have vertically long geometry and uneven air velocity profile have very serious refrigerant distribution problem. The appropriate differential refrigerant flowrate control can lead to the increase of heat exchanger performance. The distribution problems are more important for high efficient evaporator. In this paper, how to control refrigerant flowrate using small diameter tubes after distributor will be introduced. And we will review the effect of the appropriate refrigerant flowrate control of outdoor heat exchanger. Our result showed that the decrease of the standard deviation of evaporator outlet temperatures of 1°C can lead to the heating COP increase of nearly 10%.

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Pages: 6 p.

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Details

  • Original title: The effect of refrigerant flowrate control of outdoor heat exchanger.
  • Record ID : 30000981
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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