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+// Example 14_2

+clc;funcprot(0);

+//Given data

+m_s=65;// Flow rate of steam in kg/sec

+p=60;// Pressure in bar

+m_fw=63;// Flow rate of feed water in kg/sec

+m_mw=2;// Flow rate of make up water in kg/sec

+moisture=2;//%

+m_dsalt=3;// Mass of dissolved salt in ppm

+m_dsolid=5;// Mass of dissolved salt in ppm

+m_sc=1000;// ppm

+m_bd=5;// ppm

+m_c=8;// kg/sec

+T=30;// Room temperature in °C

+CV=20000;// Calorific value in kJ/kg

+C_pw=4.2;// kJ/kg.°C

+m_w=1;// kg (Assumption)

+

+//Calculation

+//(a)

+// Making the mass balance of the impurities entering and leaving the drum,

+m_b=((m_fw*m_dsalt*10^-6)+(m_mw*m_dsolid*10^-6)-((moisture/100)*m_w*m_bd*10^-6))/(m_sc*10^-6);//The blow down rate in kg/sec

+

+//(b)

+//From Steam tables,at p=60bar 

+h_fp=1213.35;// kJ/kg

+h_fT=m_w*(T-0)*C_pw;// kJ/kg

+Q_loss=((m_b*(h_fp-h_fT))/(m_c*CV))*100;//The heat loss in the blow down as the percentage of heat release in the furnace in %

+

+//(c)

+m_sd=((moisture/100)*m_w*m_dsolid*10^-6)*3600;// kg/hr

+printf('\n(a)The blow down rate=%0.4f kg/sec \n(b)The heat loss in the blow down as the percentage of heat release in the furnace,Q_loss=%0.3f percentage \n(c)Deposition rate in super heater=%0.4f kg/hr',m_b,Q_loss,m_sd);

+// The answer provided in the textbook is wrong