Minimizing Throttline Losses in the Refrigeration Cycle
Piotr A. Domanski
Most alternative non-CFC refrigerants have a large molecular structure and large heat capacity, which influence the slope of saturated liquid line and result in substantial throttling losses in a basic reversed Rankine cycle. These losses degrade the cycle efficiency below that of the original CFC fluids; virtually all carbon-based non-hydrocarbon refrigerants have a lower Coefficient of Performance than the fluids banned by the Montreal Protocol. This study analyzes the performance of pure-component refrigerants in the basic refrigeration (reversed Rankine) cycle and in three modified cycles in which the throttling-process irreversibilities are minimized: the liquid-line/suction-line heat exchange (llsl-hx) cycle, the economizer cycle, and the ejector cycle. The refrigerants considered in this study were the 38 fluids covered by REFPROP /1/, and REFROP property routines were employed in performance simulations. The Carnahan-Starling-DeSantis equation of state was applied for all fluids except ammonia, for which a formulation by Harr and Gallagher was used.
International Conference of Refrigeration, 19th Proceedings
Minimizing Throttline Losses in the Refrigeration Cycle, International Conference of Refrigeration, 19th Proceedings, Hague, , [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910532
(Accessed March 3, 2024)