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/CH18/EX18.2/Ex18_2.sce | 35 +++++++++++++++++++++++++++++++++++
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 create mode 100644 3733/CH18/EX18.2/Ex18_2.sce

(limited to '3733/CH18/EX18.2')

diff --git a/3733/CH18/EX18.2/Ex18_2.sce b/3733/CH18/EX18.2/Ex18_2.sce
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+// Example 18_2
+clc;funcprot(0);
+//Given data 
+m_w1=400;// Quantity of cooling water in kg/min
+T_1=43.5;// The temperature of water at inlet in °C
+T_a1=18.5;// °C
+RH=60;// Relative humidity in %
+T_a2=27;// °C
+V=600;// Volume of air per minute in m^3/min
+P=4;// Power absorbed in kW
+C_pw=4.2;// kJ/kg°C
+
+//Calculation
+//The conditions of air at inlet and outlet are represented on psychrometric chart as shown in Fig.Prob.18.2
+// Total heat of air at inlet + Total heat of water at inlet + heat dissipatedby motor = Total heat of air at outlet + Total heat of water at outlet
+// From psychrometric chart,
+H_a1=38.87;// kJ/kg
+H_a2=84.85;// kJ/kg
+w_1=7.8;// grams/kg
+w_2=22.6;// grams/kg
+v_s1=0.836;// m^3/kg
+m_a=V/v_s1;// kg/min
+Q=P*60;// kJ/min
+//T_2=y(1)
+function[X]=Temperature(y);
+    X(1)=((m_w1*C_pw*(T_1-y(1)))+Q)-(m_a*((H_a2-H_a1)-(((w_2-w_1)/1000)*C_pw*y(1))));
+endfunction
+y=[10]
+z=fsolve(y,Temperature);
+T_2=z(1);// The temperature of water coming out of the tower in °C
+m_m=m_a*((w_2-w_1)/1000);// The make up water required per hour in kg/min
+printf('\nThe temperature of water coming out of the tower=%0.2f°C \nThe make up water required per hour=%0.1f kg/min',T_2,m_m);
+// The answers provided in the textbook is wrong
+
+
-- 
cgit