Abstract
This paper presents the experimental investigation of the heat transfer performance of alternative low GWP (Global Warming Potential) refrigerants during nucleate boiling. The fluids used in the study are R-1234ze, R-1233zd(E), and R-450A. The first two HFOs (hydro-fluoro-olefins) have a GWP index less than or equal to 1 while the zeotropic blend R-450a has a GWP index of 547. This study compared R-1234ze and R-450A to their targeted replacement, R-134a, and compared R-1233zd(E) to R-123 using a highly enhanced tube surface. Tests were conducted at a heat flux range of 10–110kW/m2 and at a saturation temperature of 4.44°C. Results show that the performance of R-1234ze is very similar to that of R-134a while R-450a shows performance degradation of 28% compared to R-134a. For the R-123 replacement, R-1233zd(E) demonstrates a noticeable 19% performance increase. The results section includes a power-law model to predict the refrigerant-side heat transfer coefficient for all five fluids. Meanwhile, the heat flux used in the model covers a range of 10–60kW/m2, a typical range of interest for refrigerant evaporator design.
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