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+clc

+//solution

+// initialization of variables

+mdotw3=10000 // mass flow rate of water entering in cooling tower in kg/min

+Tw1=40+273 // temperature of water entering cooling tower in kelvin

+Ta1=20+273 // temperature of air entering cooling tower in kelvin

+phi1=0.5// relative humidity of entering air

+Tw2=25+273 // temperature of water leaving cooling tower in kelvin

+Ta2=32+273 // temperature of air leaving cooling tower in kelvin

+phi2=0.98 // relative humidity of leaving air

+// from psychrometric chart

+h1=37// specific enthalpy of air @ 20*C DBT and 50% humidity

+w1=0.0073 // specific humidity of air @ 20*C DBT and 50% humidity

+h2=110// specific enthalpy of air @ 32*C DBT and 98% humidity

+w2=0.030 // specific humidity of air @ 32*C DBT and 98% humidity

+

+h3=167.5 // specific enthalpy of water from steam table at 40 degree celsius

+h4=104.9 // specific enthalpy of water from steam table at 25 degree celsius

+

+mdota=(mdotw3*(h4-h3))/(h1-h2+(w2-w1)*h4) // by energy balance

+

+

+v1=0.84 // specific volume of air entering tower from psychrometric chart

+

+Qf=mdota*v1 // volume flow rate in m^3/min

+printf("The volume flow rate of air into the cooling tower is %i m^3/min \n",Qf)

+

+mdot4=mdotw3-(w2-w1)*mdota // by mass balance

+printf("The mass flow rate of water that leaves the cooling tower is %i kg/min",mdot4) 

+// The answers is slightly different in textbook due to approximations in calculations while in scilab solution is precise

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