Discussion
Consider the following statements about subcooling the liquid before the expansion valve.
1. It reduces the fraction that flashes to vapour at the valve.
2. It increases the refrigerating effect per kilogram circulated.
3. It requires additional compressor work.
Answer: B
The first two are correct and are why subcooling is worth arranging. The third is wrong, since the compressor sees the same suction condition and the gain is obtained without extra work. The extra cooling is usually free from the condenser.
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