CURRENT AND FUTURE TRENDS IN AMMONIA REFRIGERATION SYSTEMS AND CONTROL COMPONENTS

摘要

The global refrigeration industry has during several years been undergoing several changes. In particular the global environmental impact of some refrigerants, such as the ozone depletion, global warming and the greenhouse effect, has changed the industry considerable. The environmental impact is mainly focused on the synthetic refrigerants like CFC, HCFC, HFC and HFO. Natural refrigerants, like Ammonia, Carbon Dioxide (CO_2) and Hydro Carbons are not affected by environmental restrictions; however toxicity and flammability are issues that restrict the use of these refrigerants. This paper will mainly focus on Industrial Refrigeration, and applications utilizing the natural refrigerants.