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+//scilab 5.4.1

+clear;

+clc;

+printf("\t\t\tProblem Number 4.1\n\n\n");

+// Chapter 4 : The Second Law Of Thermodynamics

+// Problem 4.1  (page no. 148) 

+// Solution

+

+//given data

+t1=1000;  //(unit:fahrenheit) //Source temperature

+t2=80;   //(unit:fahrenheit) //Sink temperature

+//solution

+//converting temperatures to absolute temperatures;

+T1=t1+460; //Source temperature //Unit:R

+T2=t2+460; //Sink temperature //Unit:R

+

+printf("Solution for (a)\n");

+ans=((T1-T2)/T1)*100;//(ans in %)  //Efficiency of the engine

+printf("Efficiency of the engine is %f percentage\n\n",ans);

+

+printf("Solution for (b)\n");

+T1=2000+460; //Source temperature //Unit:R

+T2=t2+460;  //Sink temperature //Unit:R

+ans=((T1-T2)/T1)*100;//(ans in %) //Efficiency of the engine

+printf("When the upper tempretrature is increased upto certain ,Efficiency of the engine is %f percentage \n\n",ans);

+

+printf("Solution for (c)\n");

+T1=t1+460; //Source temperature //Unit:R

+T2=160+460;  //Sink temperature //Unit:R

+ans=((T1-T2)/T1)*100;//(ans in %) //Efficiency of the engine

+printf("When the lower tempretrature is increased upto certain ,Efficiency of the engine is %f percentage \n\n",ans);