As the supermarket industry in the United States looks ahead to the phase out of refrigerants like R-22, the feasibility of an outdoor ammonia chiller system utilized in a secondary loop or cascade application should not be overlooked. The United States is in a great position to take advantage of the ammonia system technologies that have developed over the years. This paper delves into the methods that have been used to implement ammonia systems in supermarket industries in other countries, provides some basic design considerations and examines what legislative and code restrictions may apply in the US.
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