Discussion
A turbine is not used in place of the expansion valve in a small refrigeration plant because
Answer: C
Correct answer: the work recoverable does not justify the cost
Expanding the liquid through a turbine would recover a little work and give a slightly greater refrigerating effect, and large plants do it. On a small machine the recoverable work is a few per cent of the compressor power, while the turbine adds cost, complexity and a maintenance liability. The throttle is chosen deliberately, not because the expansion must be isenthalpic - it is isenthalpic *because* a throttle is used.
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