Abstract
This paper presents the two-phase condensation heat transfer and pressure drop characteristics of R-513A as an alternative refrigerant to R-134a in a 9.52-mm OD horizontal microfin copper tube. The test facility had a straight, horizontal test section with an active length of 2.0 m and was cooled by cold water circulated in a surrounding annular space. The annular-side heat transfer coefficients were obtained using the Wilson plot method. The average heat transfer coefficient and pressure drop data are presented at the condensation temperature of 35 °C in the range of 100–440 kg·m−2·s−1 mass flux. The test data of R-513A are compared with those of R-134a, R-1234yf, and R-1234ze(E). The average condensation heat transfer coefficients of the R-513A and R-1234ze(E) refrigerants were similar to R-134a at the lower mass flux (100~150 kg·m−2·s−1), while they were up to 10% higher than R-134a as the mass flux increased. The pressure drop of R-513A was similar to R-1234yf and 10% lower than that of R-134a at the higher mass flux. The R-1234ze(E) pressure drops were 20 % higher compared to those of R-134a at the higher mass flux.
Highlights
Halcor-Copper Tube Division, ElvalHalcor Company, 32011 Oinofyta, Viotia, Greece; School of Mechanical Engineering & IEDT, Kyungpook National University, Daegu 41566, Korea
The results showed that the condensation heat transfer coefficients investigated thevapor evaporation increased with the refrigerant mass flux and quality. heat transfer characteristics of the saturation temperature of 20 °Cthe forcondensation mass fluxes of
The condensation experiments were conducted at the saturation temperature of 35 °C for the mass flux of 100~440 kg·m−2·s−1 with R-513A, R-134a, R-1234yf, and R-1234ze(E)
Summary
Halcor-Copper Tube Division, ElvalHalcor Company, 32011 Oinofyta, Viotia, Greece; School of Mechanical Engineering & IEDT, Kyungpook National University, Daegu 41566, Korea. This paper presents the two-phase condensation heat transfer and pressure drop characteristics of R-513A as an alternative refrigerant to R-134a in a 9.52-mm OD horizontal microfin copper tube. The annular-side heat transfer coefficients were obtained using the Wilson plot method. The average heat transfer coefficient and pressure drop data are presented at the condensation temperature of 35 ◦ C in the range of. The average condensation heat transfer coefficients of the R-513A and R-1234ze(E). Refrigerants were similar to R-134a at the lower mass flux (100~150 kg·m−2 ·s−1 ), while they were up to 10% higher than R-134a as the mass flux increased. R-1234yf and 10% lower than that of R-134a at the higher mass flux. The R-1234ze(E) pressure drops were 20 % higher compared to those of R-134a at the higher mass flux
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