Which limitation arises when an ammonia-based refrigeration evaporator operates below its minimum design temperature?

💡 Explanation

When an ammonia evaporator operates below its minimum temperature, excessive amounts of refrigerant condense in the evaporator and return to the compressor because ammonia's vapor pressure dramatically decreases when cold which dilutes the compressor lubricant. Therefore lubricant breakdown results, unlike frost, refrigerant decomposition or valve blockage, which, although related to temperature, are triggered by separate mechanisms.

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