Reliable and comprehensive predictive tools for the frictional pressure drop (FPD) are of particular importance for systems involving two-phase flow condensation. However, the available models are only applicable to specific operating conditions and chan
A new pressure drop model that is based on a superposition model for refrigerants condensing in the single circular tube is presented.doi:10.1007/s00231-012-0990-1Chang-Hyo SonHoo-Kyu OhSpringer-VerlagHeat & Mass TransferCondensation pressure drop of R22, R134a and R410A in a single circular...
Drop-in tests were conducted using R290/R32 (31:69) mixture in an ice-cream maker for possible replacement of R-502 and R-404A. Optimum refrigerant charge and TEV opening were obtained through a series of experiments. At the standard outdoor condition (35℃ DT, 24℃ WT), the time requ...
intelligent and dimensionless predictive tools for the FPD based on the separated model suggested by Lockhart and Martinelli. Among them, the most accurate results were presented by the GPR approach with AARE andR^{2}values of 4.10%, 99.23% respectively, in the testing step. The truthfulness and...
Condensation heat transfer and pressure drop of R22 and R410a were investigated experimentally in a single round stainless steel tube with the inner diameter of 0.941mm. The effects of mass flux and vapor quality were analyzed and the results indicated that local condensation coefficients increase ...
As a substitute for R22, R410A has more advantages than R407C in view of the characteristics of condensation heat transfer and pressure drop.doi:10.1016/j.ijheatmasstransfer.2012.03.012Hui-Yong ZhangKey Laboratory for Thermal Science and Power Engineering of Ministry of EducationJun-Ming Li...