Experimental study on flow boiling heat transfer of a new azeotropic mixture of R1234ze(E)/R600a in a horizontal tube

Flow pattern maps, pressure drop and performance assessment of horizontal tubes with coiled wire inserts during condensation of R-600a

“…The predicted pressure drops by the correlation proposed in this study, Eq. (25), are compared to the present experimental results in Fig. 12.…”

“…For instance, R-600a owns higher liquid thermal conductivity compared to R-134a, which would contribute to the better heat transfer. Also, the liquid viscosity of R-600a is comparatively low which would result in higher liquidity in heat exchangers [25]. The open literature survey shows that the condensation pressure loss of R-600a inside horizontal coiled wire inserted pipes has not been studied previously.…”

Heat Transfer Coefficient Characteristic Study of Natural Refrigerant with Substitute for R-134a

“…In low heat flux, the coefficient of heat transfer rises significantly with the mass vapour quality and this trend condition is more obvious in high mass flux. 2018) reported heat transfer coefficients increase significantly with the heat flux in the low quality region [47]. In addition, the effect of heat flux on nucleate boiling heat transfer is significant.…”

Boiling Heat Transfer of Low GWP Refrigerants: A Review

“…Anwar et al [19] by using the working fluid, R-1234yf, with saturation temperatures of 27°C and 32 °C and heat fluxes ranging from 05 to 130, the experimental work was carried out to make the prediction that boiling heat transfer depends on operating pressure, applied heat flux, mass flux, and vapour as well (kW.m -2 ).Jige et al [20] heat transfer coefficients of the combination rely on mass flux as well as vapour quality and mass fraction, and the effect of heat flux was minimal on heat transfer, according to flow boiling experiments with mixtures of R-1234yf and R-32 in a horizontal multiport tube with a rectangular micro channel.Zhao et al, [21] the average heat transfer coefficient is totally dependent on the drying quality, according to research that looked at the flow boiling of a number of low GWP refrigerants, including R-245fa, R-1233zd(E), R-1224yd(Z), and HFE347pc, at saturation temperatures of 37°C, 41°C, 34°C, and 70°C, respectively. Yang et al [22] in a smooth horizontal tube with an inner diameter of 6 mm and a heat flux ranging from 10.6 to 74.8 kW.m -2 , experimental data were compared with nine correlations using blends of R-1234ze (E) and R-600a in various compositions (kW.m -2 ).Lillo et al [23] it was discovered through experimental research in a horizontal stainless tube with an inner diameter of 6 mm of flow boiling, working fluids of R-1233zd (E), saturation temperatures of 24.2°C and 65.2°C, and heat fluxes of 2.4 to 40.9 (kW.m -2 ), that the trends in the bottom-of-the-tube heat transfer coefficient are not reliant on vapour quality as heat flux increases. Righetti et al [24] researchers looked at R-1233zd(E) in a flow boiling experiment in a microfin tube with an inner diameter at the fin tip of 4.2 mm at a mean saturation temperature of 65.2°C and a heat flux of 15 to 90(kW.m -2 ) and came to the conclusion that R-1233zd(E) might replace R-245fa.…”