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Condensation heat transfer and pressure drop in a single minichannel with R1234ze(E) and other refrigerants.

Number: pap. n. TP-051

Author(s) : DEL COL D., AZZOLIN M., BORTOLATO M., et al.

Summary

R1234ze(E), trans-1, 3, 3, 3-tetrafluoropropene, is a fluorinated propene isomer which may be a substitute for R134a in refrigeration applications. R1234ze(E) has a GWP equal to 6 (considering a period time of 100 years), much lower than that of R134a. While some work has been performed regarding the applications of the fluorinated propene isomers, very little data on two-phase heat transfer has been published so far in the open literature. In this paper, the local heat transfer coefficient during condensation of R1234ze(E) and the two-phase pressure drop are measured in a single minichannel, horizontally arranged, with a hydraulic diameter equal to 0.96 mm. The new experimental data is compared to condensation data for R1234yf, R134a and R32. Tests are carried out with the experimental apparatus available at the Two Phase Heat Transfer Lab of the University of Padova. During condensation tests, the heat is subtracted from the fluid by using cold water. The heat-transfer coefficient is obtained through the measurement of local heat flux and the saturation-to-wall temperature difference. Tests are performed at 40°C saturation temperature at different mass velocities. The experimental heat transfer coefficients are compared against the model by Cavallini et al. (2006). Since the saturation temperature drop directly affects the heat transfer rate, pressure drop during adiabatic two phase flow of R1234ze(E) is also measured and compared to Del Col et al. (2012) predicting model.

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Pages: 8 p.

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Details

  • Original title: Condensation heat transfer and pressure drop in a single minichannel with R1234ze(E) and other refrigerants.
  • Record ID : 30008276
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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