In-tube heat transfer characteristics of refrigerant mixtures of HFC32-134a and HFC32-125-134a.

Summary

The experiments were performed for an inner grooved horizontal tube utilized in the actual heat exchangers of air-conditioning machines for residential use with various compositions of R32 and R125. The evaporation heat transfer coefficients for R32-R134a (30-70% by weight) and R32-R125-R134a (23-25-52% by weight) became lower compared with that for a pure R22 at the same mass flux. Similarly, the condensation heat transfer results for both the refrigerant mixtures were found to be lower than that for R22.

Details

Original title: In-tube heat transfer characteristics of refrigerant mixtures of HFC32-134a and HFC32-125-134a.
Record ID : 1995-0902
Languages: English
Source: Proceedings of the 1994 International Refrigeration Conference at Purdue.
Publication date: 1994/07/19
Document available for consultation in the library of the IIR headquarters only.

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Indexing

Themes: HFCs;
Refrigerant circulation: piping, control, automation, safety;
Blends
Keywords: R134a; Heat transfer coefficient; Measurement; Tube; Heat transfer; R32; R125; Mixture; Evaporation; Refrigerant; Condensation; Pressure drop