Answer / murthy

dew point temp is temp at which the first dew will be
formed if compressed. air dew point is defined because of
dew formation due to C02 & water which forms dry ice ,not
because of air liquefication.air with dew point -40C means
it is temperature upto which there will be no dew formation
upto this temp if pressure is increased even upto critical
pressure

Answer / vaibhav v t

-40C dew point in air drying means air will be condensed
at -40 deg.c only.-40 C means good dry air.

Answer / ramana reddy

at -40c the air will become to liquified. above this temp.
air in vapor state.

Answer / samy

Air dew point is -40C because of decC and decF are meet in -40

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Question 49 - According to rules of thumb in chemical process design, consider the use of an expander for reducing the pressure of a gas when more than 20 horsepowers can be recovered. The theoretical adiabatic horsepower (THp) for expanding a gas could be estimated from the equation : THp = Q [ Ti / (8130a) ] [ 1 - (Po / Pi) ^ a ] where 3 ^ 3 is 3 power 3 or 27, Q is volumetric flowrate in standard cubic feet per minute, Ti is inlet temperature in degree Rankine, a = (k - 1) / k where k = Cp / Cv, Po and Pi are reference and systemic pressures respectively. (a) Assume Cp / Cv = 1.4, Po = 14.7 psia, (temperature in degree Rankine) = [ (temperature in degree Celsius) + 273.15 ] (9 / 5), nitrogen gas at Pi = 90 psia and 25 degree Celsius flowing at Q = 230 standard cubic feet per minute is to be vented to the atmosphere. According to rules of thumb, should an expander or a valve be used? (b) Find the outlet temperature To by using the equation To = Ti (Po / Pi) ^ a.

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