From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 3733/CH22/EX22.8/Ex22_8.sce | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 3733/CH22/EX22.8/Ex22_8.sce

(limited to '3733/CH22/EX22.8/Ex22_8.sce')

diff --git a/3733/CH22/EX22.8/Ex22_8.sce b/3733/CH22/EX22.8/Ex22_8.sce
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+// Example 22_8
+clc;funcprot(0);
+//Given data
+p_1=50;// bar
+T_1=400;// °C
+x=0.96;// Dryness
+p_2=5;// bar
+p_3=0.03;// bar
+T_3=250;// °C
+n_i=80;// Isentropic efficiency of both the expansions in %
+n_m=99;//The mechanical efficiency in %
+n_g=96;// The generator efficiency in %
+
+//Calculation
+//From h-s chart:
+h_1=3198;// kJ/kg
+h_2a=2675;// kJ/kg
+h_3=2955;// kJ/kg
+h_4a=2153;// kJ/kg
+dh_1=((n_i/100)*(h_1-h_2a));//(h_1-h_2) kJ/kg
+h_2=h_1-((n_i/100)*(h_1-h_2a));// kJ/kg
+dh_2=((n_i/100)*(h_3-h_4a));//(h_3-h_4) in kJ/kg
+W=dh_1+dh_2;//Work done per kg of steam kJ/kg
+W_e=W*(n_m/100)*(n_g/100);// The work used out of 1060 kJ for the generation of electricity in kJ/kg
+m_g=(1000/W_e)*3.6;// The steam generated in the boiler per 1 kW power generation in kg/kW-hr
+//From steam tables,
+h_fg=1643.5;// kJ/kg
+Lh=x*h_fg;// The latent heat of steam lost per kg
+m_s=(m_g*(h_3-h_2))/Lh;// The steam used in the reheater in kg
+m=m_g+m_s;// Steam generated by the boiler per kW-hr output from the generator in kg
+printf('\nThe mass of steam generated by the boiler per kW-hr=%0.3f kg',m);
+// The answer vary due to round off error
+
-- 
cgit