Analysis of Secondary-Loop Refrigeration Systems Using Carbon Dioxide as a Volatile Secondary Refrigerant

Abstract

Abstract A secondary-loop refrigeration system, using ammonia in the primary-loop and carbon dioxide as a volatile secondary refrigerant, was investigated as an alternative system for supermarkets. Ammonia and carbon dioxide are naturally occurring substances which have zero ozone depletion and zero effective global warming potential. The use of these natural refrigerants provides a long-term solution to environmental problems associated with refrigeration. Generalized computer models for the analysis of secondary-loop and conventional refrigeration systems were developed in order to evaluate the feasibility of the secondary-loop system. A description of these models is presented along with results showing the potential of the secondary-loop system. The results indicate that this system can provide a cost effective alternative.