Dsign a wet cooling tower to cool 100 kgs of water from 45 to 22 degree C for Dh

Question

Dsign a wet cooling tower to cool 100 kgs of water from 45 to 22 degree C for Dhahran area. The Atmospheric air enters the tower at 1-atm at variable dry and wet-bulb temperatures of Dhahran climate, and leaves at 35 degree C with a relative humidity of 95 percent. Obtain the weather data of Dhahran from internet for a recent year and use the data for designing the cooling tower. For each month, select at least four data to represent the month [(T_max, Phi_max), (T_min and Phi_ min.) and (T_min, Phi_max)] to represent Dhahran climate Make a plot of the volume flow rate of air into the cooling tower vesus the enthalpy of the air-water vapor mixture (h_mix) Make a plot of the mass flow rate of the required makeup water in terms of (h_mix). Select a pump to satisfy the mass flow rate of the makeup water and the volume flow rate of the air The report should include your conclusions.

Explanation / Answer

If x is the amount of makeup water supplied to replenish the evaporation loss then,

x= G(W2-W1), where G = mass flow rate of dry air , kg/s

W= specific humidity

By energy balance :

wc(hw3-hw4)= G(h2-h1)-G(W2-W1)hw,

Where wc= circulating water flow rate , kg/s

hw= Enthalpy of circulating water,kJ/kg& h= Ethalpy of dry air, kJ/kg

Range(R)= tw3-tw4= (G/cpwwc)[ (h2-h1)-(W2-W1)hw]

Approach(A)= tw3-twb1

See the psychometric chart and steam chart to know unknown values .

And take at least 3 different reading of environmental conditions of Dhahran area and then plot chart using above formulas

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