initial commit / add all books

1 files changed, 27 insertions, 0 deletions

diff --git a/2969/CH6/EX6.7/Ex6_7.sce b/2969/CH6/EX6.7/Ex6_7.sce
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+clc

+clear

+//DATA GIVEN

+C=29915;            //calorific value of coal in kJ/kg

+Mw=9.1;             //mass of feed water per kg of dry coal in kg

+Me=9.6;             //equivalent evaporation fraom and at 100 deg celsius per kg of dry coal in kg

+Te=12;              //temp. of feed water to economiser in deg celsius

+Tb=105;             //temp. of feed water to boiler in deg celsius

+Ta=13;              //temp. of air

+Tfg=370;            //temp. of flue gases entering economiser

+Mfg=18.2;           //mass of flue gases entering economiser per kg of coal

+Cp=1.046;           //mean specific heat of flue gases

+

+hb=Me*2257;               //heat supplied for steam generation in kJ

+ETAb=hb/C;                //boiler efficiency

+hflue=Mfg*Cp*(Tfg-Ta);    //heat in the flue gase per kg of dry coal entering economiser

+he=Mw*4.184*(Tb-Te);      //heat utilised in economiser

+ETAe=he/hflue;            //economiser efficiency

+htotal=hb+he;             //total heat absorbed in kg of water

+ETA=htotal/C;             //boiler plant efficiency

+

+printf(' (i) The Boiler efficiency is: %5.3f ',ETAb);

+printf('or %2.1f percent. \n',ETAb*100);

+printf(' (ii) The Economiser efficiency is: %5.3f ',ETAe);

+printf('or %2.2f percent. \n',ETAe*100);

+printf('(iii) The Overall Efficiency of boiler plant is: %5.3f ',ETA);

+printf('or %2.1f percent. \n',ETA*100);