Abstract
Synthetic refrigerants have been widely used in small industrial refrigeration applications. The phase down of high global warming potential refrigerants is underway across the world as part of the agreement to tackle climate change. This provides an opportunity for the use of natural refrigerants such as ammonia and carbon dioxide. This paper looks at the use of both ammonia and carbon dioxide for small industrial refrigeration applications. It discusses refrigerant and system selection and key criteria including safety, energy efficiency, cooling capacity and capital cost. Two examples are provided for spiral freezing and temperature controlled storage applications. Small capacity applications are defined as ranging from 60kW up to 300kW and temperatures from -40°C to +12°C. The use of ammonia and carbon dioxide in cascade is also discussed.
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