initial commit / add all books

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+clc;

+warning("off");

+printf("\n\n example7.13 - pg303");

+// given

+deltaz=30;  //[ft] - distance between process and the holding tank

+Q=100;  //[gpm] - volumetric flow rate of water

+p1=100;  //[psig]

+p2=0;  //[psig]

+g=32.1;  //[ft/sec] - acceleration due to gravity

+sv=0.0161;  //[ft^3/lb] - specific volume of water

+p=1/sv;  //[lb/ft^3] - density of water

+e=0.77;  // efficiency of centrifugal pump

+deltap=(p1-p2)*(144);  //[lbf/ft^2]

+gc=32.174;

+// using the equation deltap/p+g*(deltaz)+Ws=0;

+Wst=-deltap/p-(g/gc)*(deltaz);

+// using the formula for efficiency e=Ws(theoritical)/Ws(actual)

+// therefore

+Wsa=Wst/e;

+// the calulated shaft work is for a unit mass flow rate of water,therfore for given flow rate multiply it by the flow rate

+w=(Q*p)/(7.48*60);

+Wsactual=Wsa*w;

+power=-Wsactual/(778*0.7070);

+printf("\n\n the required horsepower is %fhp",power);