Last month, Part 1 of this article provided an overview of two of five new and emerging alternatives to conventional pumped-recirculated-liquid (PRL) systems with the potential to significantly reduce ammonia- (NH_3-) refrigerant charges: Advanced direct-expansion (also known as dry expansion or DX) systems utilizing electronic expansion valves, categorized as central systems, meaning they are used to minimize or eliminate unused NH_3 charge.
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