Monday August 26, 2019 from 10:30 to 12:10
Liquid-to-suction heat exchanger assessment using new synthetic refrigerants to replace R-134a
Adrián Mota Babiloni1, Joaquín Navarro-Esbrí1, Francisco Molés1, Carlos Mateu-Royo1, Ángel Barragán-Cervera1, Marta Amat-Albuixech1.
1ISTENER Research Group, Department of Mechanical Engineering and Construction, Universitat Jaume I, Castellón de la Plana, Spain
The liquid-to-suction heat exchanger (LSHX) is a component added to vapor compression systems that can increase the cooling capacity (CC) and coefficient of performance (COP), depending on the working fluid and operating conditions. This paper evaluates its influence of when hydrofluorolefins (HFOs) and their mixtures are used in typical R-134a operating conditions. From a theoretical point of view, the LSHX improves both CC and COP for all the fluids considered. Then, when tested in an experimental setup at different evaporating and condensing temperatures, the CC and COP increases are higher for the HFO/HFC mixtures R-513A and R-450A than for the greenhouse gas R-134a. The lower measured discharge temperature increase allows higher IHX effectiveness or higher compression ratios. According to these results, the utilization of the LSHX is advisable with new HFO/HFC mixtures in existing or new design refrigeration installations.