From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 2063/CH7/EX7.20/7_20.sce | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100755 2063/CH7/EX7.20/7_20.sce

(limited to '2063/CH7/EX7.20/7_20.sce')

diff --git a/2063/CH7/EX7.20/7_20.sce b/2063/CH7/EX7.20/7_20.sce
new file mode 100755
index 000000000..332f9922d
--- /dev/null
+++ b/2063/CH7/EX7.20/7_20.sce
@@ -0,0 +1,29 @@
+clc
+clear
+//Input data
+D=0.6;//Brake wheel diameter of a constant speed compression ignition engine operating on four stroke cycle in m
+t=0.01;//Thickness of brake band in m
+N=500;//Operating speed of the engine in rpm
+W=20;//Load on brake band in kgf
+S=3;//Spring balance reading in kgf
+l=6.25;//Length of indicator diagram in cm
+A=4.35;//Area of indicator diagram in cm^2
+Sn=11;//Spring number in kgf/cm^2/cm
+d=10;//Diameter of the bore in cm
+L=0.13;//Length of the stroke in m
+F=0.23;//Specific fuel consumption in kg/BHP hr
+CV=10000;//Heating value of fuel in kcal/kg
+
+//Calculations
+BHP=(3.14*(D+t)*N*(W-S))/4500;//Brake horse power in kW
+MEP=(A*Sn)/l;//Mean effective pressure in kgf/cm^2
+Ar=(3.14*d^2)/4;//Area of the cylinder in cm^2
+np=N/2;//Number of explosions per minute
+IHP=(MEP*L*Ar*np)/4500;//Indicated horse power in kW
+nm=(BHP/IHP)*100;//Mechanical efficiency in percentage
+Wf=F*BHP;//Fuel consumption per hr in kg/hr
+nt=((IHP*4500*60)/(Wf*CV*427))*100;//Indicated thermal efficiency in percentage
+nb=((BHP*4500*60)/(Wf*CV*427))*100;//Brake thermal efficiency in kW
+
+//Output
+printf('(a)The brake horse power is %3.2f kW\n (b)Indicated horse power is %3.3f kW\n (c)Mechanical efficiency is %3.1f percent\n (d)Indicated thermal efficiency is %3.0f percent\n (e)Brake thermal efficiency is %3.1f percent',BHP,IHP,nm,nt,nb)
-- 
cgit