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IIR document

Refrigerant side heat transfer in condensers with round tubes.

Number: pap. n. TP-087

Author(s) : HRNJAK P., KONDOU C.

Summary

Conventional modeling of condensers always assumes three zones: desuperheating, condensation and subcooling even condensation occurs in desuperheating zone at some conditions and that subcooling occurs during condensation. This paper discusses the actual situation and provides experimental validation of the hypothesis. The experimental results show heat transfer coefficients of CO2, R410A and R1234yf at mass fluxes 100 to 240 kg m-2s-1and reduced pressures from 68% to 100% in a horizontal smooth tube of 6.1 mm inner diameter. Data are compared to correlations proposed for other working fluids or other conditions. Results show much higher values of HTC than correlation proposed for single-phase turbulent flow in superheated zone. The occurrence of condensation in superheat zone is evident when tube wall temperature is below saturation temperature. The results suggest that simplified calculations of heat rejection in superheated zone significantly oversize the condenser. The semi-empirical correlation, which is here proposed as the combination of existing correlations for single-phase turbulent and saturated condensation, satisfactorily predicts the heat transfer coefficient of the superheat zone condensation.

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Pages: 11 p.

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Details

  • Original title: Refrigerant side heat transfer in condensers with round tubes.
  • Record ID : 30008314
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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