29 replies to this topic

[Bobby Strain]

Show your work. Including input and output. Maybe someone will help. First you should compare your input variables with the ones on the vendor sheet. And check some of the references you were given. They will have power calculation formulas.

 

Bobby

[Brijesh Patel]

Hi Bobby..

 

In my calculation now I am able to get pressure ratio and volumetric efficiency as same as software generated sheet. But still power(HP) is not matching with that sheet. Can you help me with equation of horse power calculation with some correction factor or Efficiency.

 

Brijesh

[Bobby Strain]

You need to check both mechanical efficiency and adiabatic efficiency. There are no mysteries to calculating theoretical adiabatic compression power requirements.

 

http://www.arielcorp...?TocPath=_____1

 

Bobby

Edited by Bobby Strain, 21 July 2016 - 10:36 AM.

[Brijesh Patel]

Hi bobby,

I am using efficiency value from this attached graph. This is from Book COMPRESSORS Selection and Sizing by ROYCE N BROWN. But still I am away from correct result.

 

Second thing is about frame friction. How to consider frame friction in calculated power. And in previouse performance sheet Stage power is (w/Friction). What is meaning of w/Friction.

 

Another confusion with effect on power due to valve loss. how to consider valve loss in power calculation

 

Thanks

Brijesh

You need to check both mechanical efficiency and adiabatic efficiency. There are no mysteries to calculating theoretical adiabatic compression power requirements.

 

http://www.arielcorp...?TocPath=_____1

 

Bobby

Attached Files

•  Mech eff.pdf   152.65KB   23 downloads

Edited by Brijesh Patel, 02 August 2016 - 03:08 AM.

[Brijesh Patel]

Hi Bobby.

 

please reply for above mentioned question

 

I need help

 

Thanks

Brijesh patel