diff options
Diffstat (limited to '965/CH2/EX2.42')
| -rw-r--r-- | 965/CH2/EX2.42/42.sci | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/965/CH2/EX2.42/42.sci b/965/CH2/EX2.42/42.sci new file mode 100644 index 000000000..b5908c9eb --- /dev/null +++ b/965/CH2/EX2.42/42.sci @@ -0,0 +1,25 @@ +clc;
+clear all;
+disp("minimum thickness")
+r1=80/2;//mm
+k=0.2;// W/(m*C)
+L=25;//m
+t2=25;// degree C
+tsat=217.2;// degree C corresponding to 22 bar pressure
+t1=tsat;
+hfg=1868.1;// kJ/kg from steam tables
+dfi=0.99;// dryness factor of entering steam
+dfo=0.97;// dryness factor of outgoing steam
+
+Q=(dfi-dfo)*hfg;// heat loss per kg of steam passing through the pipe
+Qloss=Q*800/3600;//total heat loss through the pipe per second
+disp("W",Qloss*1000,"total heat loss through the pipe per second")
+
+//Qloss=2*3.1416*L*k*(t1-t2)/1og (r2/r1);
+X=2*3.1416*L*(t1-t2)*k
+r2=r1*exp(X/(Qloss*1000))
+t=r2-r1;
+disp("mm",t,"mimimum thickness of insulation =")
+
+
+
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