Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Sum of (A) and (B)
Difference of (A) and (B)
Heat stored in the human body
Heat dissipated to the surroundings

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

It considerably reduces mass of the system
The positive work in isentropic expansion of liquid is very small
It improves the C.O.P., as the condenser is small
It leads to significant cost reduction

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