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

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

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Refrigeration and Air Conditioning
Which of the following statement is correct?

All of the listed here
The wet bulb temperature is a measure of enthalpy of moist air
The wet bulb and dry bulb temperature are equal at saturation condition
The constant enthalpy lines are also constant wet bulb temperature lines

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