6 replies to this topic

[CHEMSTRONG]

Hi All,

 

I have a query w r t Fired Heater Forced Draft Fan Performance curves. I have a furnace for CDU which has combustion air FD fan .I am trying to simulate fired heater in hysys.

FD fan datasheet has curves in it as capacity in m3/ min vs static pressure in mm water column . Datasheet also mentioned that suction pressure is -30 mm water column and discharge pressure is 200 mm water column .In Hysys,  curves are put in the form of head vs capacity. I want to know how to convert static pressure in mm WC to head in m .? Request your help with detailed explanation.

[breizh]

hi ,

- Probably good for you to find a unit converter , A very good one is Uconeer from our colleague Katmar .

1013mbar=10.33 m wc ;  1 bar =100kpa

 

- Pressure should be expressed in absolute (suction pressure) , not vacuum

 

 

https://www.nyb.com/...tters/EL-03.pdf

 

hope this is helping you

 

Breizh

Edited by breizh, 01 January 2018 - 06:02 AM.

[CHEMSTRONG]

Dear Sir,

When we say static pressure , is it suction pressure or discharge pressure of fan ? WHY IT is called static pressure then ? Also generally , we use density*acceleration due to gravity* height for liquud contained in tanks or vessels as hydrodynamic head. This is Combustion Air fan which is gaseous system. I THINK we can nt use this formula for gases.. Please guide me if I m wrong in my undestanding ?

Please clarify in details how to convert this static pressure into head in m accurately.

[breizh]

http://www.klmtechgr...stems_Rev01.pdf

 

Hi ,

Hope this is helping you , on top what was supplied before !

 

 

 

Breizh

Edited by breizh, 01 January 2018 - 06:09 AM.

[CHEMSTRONG]

Respected Sir,
I went through the documents. But i did nt get how to convert static pressure in mm water column into head in m now. Please help me. If it is a liquid, i would have found out by simply using hydrodynamic relation. But it is air . So how to convert it ?

Regds,
Chetan Chavan

[Padmakar Katre]

Hi All,

 

I have a query w r t Fired Heater Forced Draft Fan Performance curves. I have a furnace for CDU which has combustion air FD fan .I am trying to simulate fired heater in hysys.

FD fan datasheet has curves in it as capacity in m3/ min vs static pressure in mm water column . Datasheet also mentioned that suction pressure is -30 mm water column and discharge pressure is 200 mm water column .In Hysys,  curves are put in the form of head vs capacity. I want to know how to convert static pressure in mm WC to head in m .? Request your help with detailed explanation.

 

You can simply use the static pressure vs air flow curves in simulation. I presume you are using compressor template in Hysys since no fans or blowers has separate template.  

[CHEMSTRONG]

dear Padmakar Sir,

I m using UniSim Design wherein one can not put static pressure vs capacity in Curves option.

Please advice me some solution to this problem. I can put only head vs flow therein..

Regards,
Chetan Chavan