HEAT TRANSFER AND PRESSURE DROP DURING EVAPORATION AND CONDENSATION OF R134a INSIDE TWO MICROFIN TUBES OF NEW DESIGN

Condensation of pure and near-azeotropic refrigerants in microfin tubes: A new computational procedure

“…(8), (11) and (12) are obtained reducing 558 experimental data points, selected with low experimental uncertainty, available temperature difference, different tube geometries and operative fluids. With reference to Table 1, the following datasets are used in the best fitting procedure: 186 points by Cavallini et al (2002aCavallini et al ( ,b, 2006a for R134a, R22, R410A, 96 by Haraguchi (1994) for R134a and R123, 106 by Kedzierski and Goncalves (1997) for R32, 10 by Arosio et al (1996) for R22, 52 by Miyara (2002) for R410A, 39 from Kim et al (2002) for R22 and R410A, 20 from Zilli et al (2003) for carbon dioxide, 32 from Colombo et al (2006) for R134a, 17 from Uchida et al (1997) for R22. The expression for the optimal number of fins n opt in Eq.…”