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Flow boiling performance of refrigerants considering penalization terms (exergy losses) for heat transfer and pressure drop.

Number: pap. ID: 213

Author(s) : BROWN J. S., ZILIO C.

Summary

The heat transfer coefficient correlation of Wojtan et al. (2005) and the pressure drop correlation of Moreno Quiben and Thome (2007) are used to analyze the boiling heat transfer performance potentials in plain evaporator tubes of several conventional refrigerants and two newer fluorinated propene isomers possessing low GWP. These correlations are used to calculate two penalization quantities expressed in terms of the refrigerant saturation temperature drop due to pressure drop and the driving temperature difference. These penalization terms are combined into a single Performance Evaluation Criterion dubbed Total Temperature Penalization (TTP). Using the two penalization terms and the TTP, several refrigerants, including R1234yf (CF3CF=CH2) and R1234ze(E) (CF3CH=CHF), are evaluated for their boiling heat transfer performance potentials in plain evaporator tubes, and the usefulness of the technique is illustrated through several examples of the optimization of evaporator tube length.

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Pages: 8 p.

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Details

  • Original title: Flow boiling performance of refrigerants considering penalization terms (exergy losses) for heat transfer and pressure drop.
  • Record ID : 30002245
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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