What is a 'secondary loop' refrigeration system, and how does it reduce ozone-depleting refrigerant emissions compared to direct expansion systems?
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A
It uses a secondary heat-transfer fluid (like glycol) in the store, keeping refrigerant contained in a central machine room with fewer leak points
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B
It uses two separate refrigerant circuits at different temperatures
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C
It employs a secondary compressor for backup during equipment failure
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D
It recirculates recovered refrigerant through a secondary purification loop