Pool boiling of R515A, R1234ze(E), and R1233zd(E) on a reentrant cavity surface

摘要

This paper quantifies the pool boiling performance of R515A, R1234ze(E), and R1233zd(E) on a flattened, horizontal Turbo-ESP surface for air-conditioning. The measured boiling curve for R515A had roughly a 14 % larger heat flux than that of R1234ze(E) for heat fluxes greater than 45 kWm~(~2). For heat fluxes between 14 kWm~(~2) and 85 kW~(~2), R515A and R1234ze(E) exhibited a heat flux that was 33 % and 17 % larger than that for R134a. The heat flux of R1233zd(E) was roughly 18 % larger than that for R123 between 30 kWm~(~2) and 87 kW~(~2). A pool boiling model that was previously developed for pure and mixed refrigerants on the Turbo-ESP surface was improved by nondimensionalizing the model constants and improving their statistical significance. The model was used to show that the vapor Prandtl number and the product of the latent heat and vapor density significantly influenced the boiling heat flux.