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Heat Transfer and Pressure Drop in Internal Flow Condensation
Published in Satish G. Kandlikar, Masahiro Shoji, Vijay K. Dhir, Handbook of Phase Change: Boiling and Condensation, 2019
Multicomponent mixtures are encountered in many chemical and process industries. The search for alternative refrigerants has resulted in a ternary refrigerant mixture R407C, composed of 23wt%HFC32, 25wt%HFC125 and 52wt%HFC134a as a possible candidate for replacing R22, which has been widely used in air-conditioning and refrigeration systems until now.
Performance studies of R433A in a direct expansion solar-assisted heat pump
Published in International Journal of Ambient Energy, 2020
Lokesh Paradeshi, M. Srinivas, S. Jayaraj
Similarly, hydrocarbons, hydrofluorocarbons-based mixtures such as R407C, R404A and R410A were also investigated for the replacement of R22 in heat pump and air-conditioning applications (Calm and Hourahan 2001). Several researchers reported R407C as an alternative to R22 system such as heat pump and air-conditioning applications. Studies reported that, a ternary zeotropic mixture have a lower COP and a higher compressor power consumption (7–14% and 6–8%) (Mongey et al. 1996; Greco et al. 1997; Payne and Domanski 2002; Rakhesh, Venkatarathnam, and Murthy 2003). These HFC mixtures were also tested in the solar-assisted heat pumps. Chata, Chaturvedi, and Almogbel (2005) theoretically studied the thermal performance of a solar-assisted heat pump using various refrigerants. A graphical method was developed for sizing the collector area for different refrigerants. Khorasaninejad and Hajabdollahi (2014) optimised the solar-assisted heat system working with R123, R134a, R407C and R22 using particle swarm algorithm. Nuntaphan, Chansena, and Kiatsiriroat (2009) assessed the performance of a refrigerant mixture consisting of R22/R124/R152a (By mass with the ratio of 20:57:23) in a traditional solar heat pump systems. The results obtained from the mixture indicate that the system COP varies in the range between 2.5 and 5.0. Malinaroli, Joppolo, and Antonellis (2014) carried out the simulation of DX-SAHP working with R407C as a refrigerant. Their results indicate that, R407C has a COP between 2.2 and 4.3. The R407C was reported as a good substitute for replacing R22 in DX-SAHP systems.