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+//ques7

+//calculating humidity ratio and relative humidity 

+clear

+clc

+//1-Inlet state

+//2-Exit state

+P=100;//net pressure n kPa 

+//it is steady state adiabatic process

+//water vapour leaving is saturated so Pv2=Pg2

+Pg2=2.339;//saturation pressure of vapour in kPa

+Pv2=Pg2;//partial pressure of vapour

+w2=0.622*Pv2/(P-Pg2);

+Cpa=1.004;//specific heat n kJ/kg/K

+T2=20;// final temp in C

+T1=30;// initial temp in C

+Hfg2=2454.1;//specific heat difference at state 2 in kJ/kg

+hv1=2556.3;//enthalpy of water vapour at state 1 in kJ/kg

+hl2=83.96;//enthalpy of liquid water in kJ/kg

+w1=(Cpa*(T2-T1)+w2*Hfg2)/(hv1-hl2);

+printf('Relative humidity = %.4f \n',w1);

+//also w1=0.622*Pv1/(100-Pv2)

+Pv1=100*w1/(0.622+w1);

+Pg1=4.246;//saturation pressure at state 1 in kPa

+r=Pv1/Pg1;//humidity ratio

+printf(' Humidity ratio = %.3f ',r);
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