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Performance evaluation of peripheral-finned tube evaporators under frosting conditions.

Number: pap. 2195

Author(s) : TIMMERMANN M. A. S., BARBOSA J. R. Jr

Summary

The peripheral finned-tube(PFT )is anovel air-side geometry for compact heat exchangers. Previous studies (Pussoli et al., 2012) evaluated the thermal-hydraulic performance of the PFT geometry under dry conditions (i.e., no frost or condensate formation on the air side). The present study focuses on quantifying the thermal-hydraulic performance of the PFT geometry under frosting conditions. A PFT prototype was tested in a closed-loop wind tunnel calorimeter to determine the influence of the tube wall temperature, air velocity and psychrometric properties (temperature and relative humidity) on the heat transfer rate, air-side pressure drop and mass of frost built up on the surface. A mathematical model was developed to predict the behavior of the evaporator in a variety of operating conditions. The model treats the air flow paths as a porous medium, whose porosity, equivalent particle diameter and thermal properties change with time due to the frost accumulation. The time-dependent characteristics of rates of heat transfer and moisture deposition and of the air-side pressure drop were well correlated by the mathematical model.

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Pages: 10 p.

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Details

  • Original title: Performance evaluation of peripheral-finned tube evaporators under frosting conditions.
  • Record ID : 30018770
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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