An engineer has presented a piping system layout that includes a pump, condenser, and cooling tower...

Question

An engineer has presented a piping system layout that includes a pump, condenser, and cooling tower for a building cooling application. Size the piping and specify the pump required if the total volume flow rate of water is 431 gpm, the pressure drop in the condenser is 15 ft of water gage, the vertical distance from the pump centerline to the top of the cooling tower is 45 ft, the horizontal distance from the condenser to the tower is 70 ft, and the pump is 15 ft below the tower basin. All the necessary accessories are shown in the sketch provided by the engineer.

David · Accepted Answer

According Bernoulli Equation
We have  
P1-P2=15ft of water gage 
Since velocity is given in gpm the equation will modify as 
   
 
 
 
   
 
    

 
 
   
 
    

 
 
   
 
    
 
 
 
 
   
 
    

Where Vm1 input velocity to condenser  in kg/m 
Vm2 out  velocity of condenser in  kg/m 
Vm1= 450gpm =9.11*450 kg/m=4100kg/m 
P1-P2=15ft of water gage= 44.83 kpa 
So
 

        
 
 
 
 
   
 
    
           
 Lets asuume  input pipe radius be 15cm so
So above equation becomes
 
 
   
 
    
 
 
 

            

   
 
   
              
Lets take Vm2=4100kg/m 
            
    
(    ) 

So radius r2 will be  
   √
   
    
       
So the dimension of pipes are input to condenser should have 30cm radius and output of condenser 
should have 170cm

An engineer has presented a piping system layout that includes a pump, condenser, and cooling tower for a building cooling application. Size the piping and specify the pump required if the total...

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