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Round-tube and microchannel heat exchanger modeling at wet air condition.

Number: pap. 2474

Author(s) : ZOU Y., LI H., TANG K., et al.

Summary

This paper discusses the modeling of round tube plate fin heat exchanger (RTPF) and microchannel heat exchanger (MCHX) under wet air conditions. The heat exchanger models are based on finite volume method. In each control volume, the empirical heat transfer and pressure drop correlations for refrigerant and air are adopted and the effectiveness-NTU method is applied for heat transfer calculation. For the round tube heat exchanger, the tube circuiting is considered. For microchannel heat exchanger, both uniform distribution and maldistribution among parallel microchannel tubes are investigated and compared. When the inlet air dew point temperature is higher than the heat exchanger surface temperature, dehumidification of air occurs. Two methods are compared to simulate the wet air condition: (1) the air side is simulated based on the total enthalpy method; (2) the air side is simulated based on heat and mass transfer method. The heat exchanger models are validated against the experimental results of a 2.5 ton residential air-conditioning system. The experiment was conducted based on AHSI/AHRI standard 210/240 at A, B (wet coils), and C (dry coil) conditions with either round tube evaporator or microchannel evaporator. The microchannel heat exchanger was tested at both direct expansion (DX) and flash gas bypass (FGB) conditions. The modeling results show good accuracy compared to the experimental results. The capacity errors are within ±10%.

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Pages: 10

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Details

  • Original title: Round-tube and microchannel heat exchanger modeling at wet air condition.
  • Record ID : 30018871
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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