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+//scilab 5.4.1

+clear;

+clc;

+printf("\t\t\tProblem Number 7.15\n\n\n");

+// Chapter 7 : Mixtures Of Ideal Gases

+// Problem 7.15  (page no. 343) 

+// Solution

+

+//Problem 7.14 using equations, Rm=((ma/(ma+mv))*Ra)+((mv/(ma+mv))*Rv)   and  phy*pvs=pv

+W=0.005; //Humidity ratio

+pm=14.7; //mixture is at 14.7 psia

+//W=0.622*(pv/(pm-pv))

+//Rearranging,

+pv=(W*pm)/(0.622+W); //the partial pressure of the water vapor 

+printf("The partial pressure of the water vapor is %f psia\n",pv);

+pa=pm-pv; //pa=the partial pressure of the dry air in the mixture

+printf("The partial pressure of dry air is %f psia\n",pa);

+//It is necessary to obtain pvs from the Steam Tables at 90 F.This is 0.6988 psia.

+pvs=0.6988; //saturation pressure of water vapor at the temperature of mixture

+printf("The partial pressure of the water vapor at saturation is %f psia\n",pvs);

+//Therefore,

+phy=pv/pvs; //relative humidity

+printf("The relative humidity  is %f percent\n",phy*100);

+//The dew point temperature is the saturation temperature corresponding to 0.117 psia,which is found from the Steam Tables to be 39 F.

+printf("The dew point temperature of the mixture is 39 F\n");

+//The results of this problem and problem 7.14 are in good agreement