NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Ternary Zeotropic Mixture With CO2 Component for R-22 Heat Pump Application.


pdf icon Ternary Zeotropic Mixture With CO2 Component for R-22 Heat Pump Application. (634 K)
Maczek, K.; Muller, J.; Wojtas, K.; Domanski, P. A.

CLIMA 2000 Conference, Proceedings. August 30-September 2, 1997, Brussels, Belgium, 1-9 pp, 1997.

Keywords:

zeotropic mixture; alternative refrigerants; heat pumps; carbon dioxide

Abstract:

The objective of this research project was to demonstrate a successful operation of a high efficiency heat pump employing a zeotropic mixture with a zero ozone-depletion and a small greenhouse warming potential (ODP and GWP, respectively). The project addresses the technical challenges resulting from international agreements regulating the use of ozone-depleting substances. The signatory countries of the Montreal Protocol agreed to phase out production of chlorine-containing refrigerants with deadlines depending on the ODP of the fluids. A search for a proper substitute has to consider factors such as capacity, efficiency, flammability, oil/refrigerant solubility, toxicity, etd. This study investigaged possible R-22 alternatives with the goal of achieving a comparable system capacity and 10% improvement in Coefficient of Performance (COP). The tests were performed in COCH (Refrigerating Machinery Research Center in Cracow, Poland).