Condensation heat transfer of low GWP ORC working fluids in a horizontal smooth tube. (January 2017)

• Record Type: Journal Article
• Authors: Ghim, Goohyun; Lee, Jaeseon
• Is Part Of: International journal of heat and mass transfer. Volume 104(2017:Jan.)
• Page Start: 718
• Page End: 728
• Publication Date: 2017-01
• Subjects: ORC -- In-tube condensation -- Heat transfer -- GWP -- Working fluids; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2016.08.090
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Condensation heat transfer of ORC working fluids was characterized. In-tube ORC fluid condensation heat transfer coefficients were measured experimentally. Low-GWP working fluids show less efficient heat transfer performance than high-GWP fluid. Abstract: The objective of the current study is to conduct an experimental investigation of condensation heat transfer for the ORC (organic Rankine cycle) working fluids R245fa, Novec®649 and HFE-7000 over a wide range of parameters. Quasi-local condensation heat transfer coefficients are measured in a straight horizontal 7.75-mm-ID smooth tube with flow conditions at mass flux G = 150–700 kg (m 2 -s) − 1, local equilibrium quality x = 0.05–0.95, and reduced pressure, Pr = 0.05–0.15 . Test data reveal that the environmentally friendly fluids have lower condensation heat transfer coefficients when compared to R245fa. The 141 measured condensation heat transfer coefficients are compared to six well-known correlations. Among the six correlations verified with test data, the Shah correlation shows the best predictive performance for the three fluids tested.