- Author
- Domanski, P. A.
- Title
- Minimizing Throttline Losses in the Refrigeration Cycle.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- International Congress of Refrigeration, 19th Proceedings. Volume IVb. Theme 4. IIR Commission B2. August 1995, Hague, The Netherlands, 766-773 p., 1995
- Keywords
- refrigeration | air conditioning | economizer | ejector | liquid-line/suction-line heat exchanger | Rankine cycle | vapor compression cycle
- Abstract
- 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.