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

In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour
None of the listed here
The value of C.O.P. is always greater than one
The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region

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Refrigeration and Air Conditioning
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
0.622 Pv / (Pb - Pv)

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