Heat Transfer/Pressure Drop Aeration Blower Piping

[stanier]

I am looking for a procedure/spreadsheet/Mathcad to calculate the exit temperature of a pipe that is used for aeration blower air.

Inlet conditions from blower are P=180 kPaA T=110C, Outlet P=100kPaA T=?.

Flow is 5965 m3/hr. Pipe is 150m DN400 2mm thick ss, ambient air temperature 40C.

The temperature is needed to determine if the outlet pipe can be metallic or thermoplastic.

I know this sounds like a homework question but it is a real situation. I only ask as I generally work with liquids and slurries.

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[FiltrationEngineer]

Its a simple heat transfer question. Once the pipes hit water the temperature will drop very fast, so you can usually use plastic drop pipes into water...

 

[bimr]

.283
Delta T = T1( (p2/p1) - 1)


Delta T = adiabatic temperature rise Deg K acrosss blower
T1 = absolute inlet temperature Deg K
p1 = absolute inlet pressure atm
p2 = absolute outlet pressure atm

Actual temperature rise is approximat4ed by dividing Delta T by blower efficiency.

The temperature should be around 140 to 180 Deg F.

From Wastewater Engineering, Metcalf & Eddy

 

[bimr]

Formula did not come out correctly. It should be

T1 X ( ((p2/p1) to 0.283 power) - 1)