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	   "source": [
       "# Chapter 15: Engine Cooling"
	   ]
	},
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		   "metadata": {},
		   "source": [
			"## Example 15.1: Coolant_required_for_petrol_and_diesel_engine.sce"
		   ]
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"clc;funcprot(0);//EXAMPLE 15.1\n",
"// Initialisation of Variables\n",
"BP=90;.................//Brake Power in kW\n",
"deltw=27;.................//Raise in temperature of water \n",
"etaP=0.25;...................//Efficiency of petrol engine\n",
"etaD=0.3;....................//Efficiency od diesel engine\n",
"Pec=32;......................//Percentage of energy going to coolant in petrol engine\n",
"Dec=28;......................//Percentage of energy going to coolant in diesel engine\n",
"cp=4.187;..........//specific heat of water at constant pressure\n",
"//Calculations\n",
"hsP = BP/etaP;............//Heat supplied in kW or kJ/s\n",
"ecP=hsP*(Pec/100);.............//Energy going to cooling water in kg/s\n",
"mwP=ecP/(cp*deltw);.............//Mass of cooling water required\n",
"hsD = BP/etaD;............//Heat supplied in kW or kJ/s\n",
"ecD=hsD*(Dec/100);.............//Energy going to cooling water in kg/s\n",
"mwD=ecD/(cp*deltw);.............//Mass of cooling water required\n",
"disp(mwP*3600,'The mass of cooling water required (kg/h)for petrol engine:')\n",
"disp(mwD*3600,'The mass of cooling water required (kg/h)for diesel engine:')"
   ]
   }
,
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		   "metadata": {},
		   "source": [
			"## Example 17.28: Indicated_mean_effective_pressure_and_brake_mean_effective_pressure.sce"
		   ]
		  },
  {
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"clc;funcprot(0);//EXAMPLE 17.28\n",
"// Initialisation of Variables\n",
"D=0.2;.................//Engine bore in m\n",
"L=0.25;...............//Engine stroke in m\n",
"n=2;......................//No of cylinders\n",
"r=13;......................//Compression ratio\n",
"fc=14;..................//Fuel consumption in kg/h\n",
"N=300;....................//Engine rpm\n",
"etarel=0.65;..............//Relative efficiency\n",
"etamech=0.76;.............//Mechanical efficiency\n",
"co=0.05;.....................//Cut off of the stroke\n",
"C=41800;.....................//Calorific value of fuel in kJ/kg\n",
"k=1;........................//Two stroke engine\n",
"ga=1.4;.......................//Degree of freedom\n",
"//calculations\n",
"rho=1+(co*(r-1));\n",
"etast=1-((1/(r^(ga-1)))*(1/ga)*((rho^ga)-1)*(1/(rho-1)));............//Air standard efficiency\n",
"etath=etarel*etast;........................//Thermal efficiency\n",
"IP=etath*(fc/3600)*C;........................//Indicated power in kW\n",
"BP=etamech*IP;................................//Brake power in kW\n",
"pmi=(6*IP)/(n*N*L*(%pi/4)*D*D*k*10);............//mean effective pressure in bar\n",
"disp(pmi,'Mean effective pressure (in bar):')\n",
"pmb=pmi*etamech;...........................//Brake mean effective pressure in bar\n",
"disp(pmb,'Brake mean effective pressure (in bar):')"
   ]
   }
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