Heat Transfer and Pressure Drop During Evaporation and Condensation of R22 inside 9.52-mm O.D. Microfin Tubes of Different Geometries

Evaluation of existing condensation heat transfer models in horizontal micro-fin tubes

“…Table 6 summarizes the mean absolute deviations achieved by the model on the pure refrigerant data sets. The prediction results for Hitachi Cable [17], Muzzio et al [21,22], Schlager [23], Yasuda et al [32] R22 data sets closely agree with the results claimed by Cavallini et al [5].…”

Condensation heat transfer enhancement mechanism for vertical upflows by the phase separation concept at small gravity

“…The liquid film thickness increases due to the accumulation of liquid near the tube wall, leading to the deterioration of condensation heat transfer. It is difficult to solve the problem mentioned above by using the conventional condenser tubes, such as the micro-fin/fin tubes [18][19][20][21][22], the groove tubes [23,24] and the enhanced tubes with insert [25].…”

Horizontal Convective Boiling of R134a, R1234yf/R134a, and R1234ze(e) Within a Micro-Fin Tube

“…Zhang et al (2007) measured the evaporation heat-transfer coefficients of R417A and R22 inside a micro-fin tube and introduced a new heat-transfer correlation to predict their values. Muzzio et al (1998) and Chamra and Webb (1995) investigated the heat-transfer performance of micro-fin tubes with R22. Yun et al (2002) examined existing experimental data and developed a model, which was validated for use with R22, R113, R123, R134a, and R410A, and a variety of micro-fin tube geometries.…”