Flow boiling heat transfer of zeotropic mixture R1234yf/R32 inside a horizontal multiport tube

Evaporation Heat Transfer and Pressure Drop of Low-Global Warming Potential Refrigerant HFO-1234yf in 6.95-mm Horizontal Smooth Tube

“…In addition, as the mass flow rate increased, the heat transfer coefficient increased. This trend was consistent with the results reported in studies by Mortada et al [4] and Jige et al [17]. This is thought to be because the mass velocity of the refrigerant increases, the Reynolds number increases, and the flow pattern develops rapidly.…”

“…Other research on the heat transfer and pressure drop of R-1234yf is summarized in Table 1. Most previous studies on the heat transfer of R-1234yf [11][12][13][14][15][16][17][18][19] were conducted with small diameters; as such, the research data on evaporative heat transfer at 5 mm or less are insufficient. Therefore, to be applicable in households and small refrigerators, this study analyzes the heat transfer coefficient and pressure drop of R-1234yf in a double-tube heat exchanger with an inner diameter of 6.95 mm.…”

Experimental Investigation of Two-Phase Flow Boiling Heat Transfer Coefficient and Pressure Drop of R448A inside Multiport Mini-Channel Tube

“…As is evident from Figure 7a, the simplified enhancement factor can be optimally correlated using the Lockhart-Martinelli parameter (X tt ) as the data points clustered near E sim = a/X b tt line (red line). A strong dependence of the ratio of heat transfer coefficient on the liquid heat transfer coefficient against the Lockhart-Martinelli parameter (X tt ) was also reported by Li [10] and Berto [11]. The optimized value can be obtained by curvefitting the superposition coefficient (n) and enhancement factor coefficients (a and b) together with the experimental heat transfer coefficient data.…”

“…In addition, the 0.96 mm tube had a higher heat transfer coefficient compared with that of the 8 mm channel. Jige et al [11] studied the flow boiling of R1234yf/R32 zeotropic mixture at two different compositions inside the multiport minichannel tube. They observed that the heat transfer coefficient was significantly affected by the mass flux, quality, mass fraction.…”

Boiling Heat Transfer of Low GWP Refrigerants: A Review

“…Yang et al [18] in order to draw the conclusion that fluid characteristics, flow circumstances, and flow patterns affect pressure drop and flow boiling heat transfer performance, an experiment was conducted using HFO-1234yf as the working fluid in a circular tube with an inner diameter of 4 mm and a length of 600 mm at saturation temperature of 14°C. 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.…”