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Tema Fouling Factor In Hysys


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#1 Ghasem.Bashiri

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Posted 24 November 2008 - 08:26 AM

Dear Colleagues
A very simple problem: As you may know TEMA proposed some recommendation about fouling factor within his standard. Unit of these proposed values are hr.ft2.°F/BTU.
When I insert this data within HYSYS environment these software change them into SI unit.
I try to manual perform unit conversion but I colud not reach to HYSYS values.
Do you have any experince about this item.
For example for TEMA value of 0.001 hr.ft.°F/BTU, HYSYS predict 0.000176 m2.°C/W but with unit converstion I get 0.00057 m2.°C/W (Refer to attachment)
A.Bashiri
Tehran Iran
Ghasem.Bashiri@gmail.com

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#2 Zauberberg

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Posted 24 November 2008 - 09:11 AM


Software is correct. Check your unit conversion tool, maybe you have simply missed something.
0.001 hr.ft.°F/BTU = 0.000176 m2.°C/W, it's done in Katmar's Uconeer tool.

#3 gvdlans

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Posted 24 November 2008 - 01:25 PM

1 hr.ft2.°F/BTU * 3600 * s/hr * (0.3048 * m/ft)^2 * 5/9 * °C/°F * (1/1055) * BTU/J = 0.1761 m2.°C/W

I guess Ghasem did this:

1 hr.ft2.°F/BTU * 3600 * s/hr * (0.3048 * m/ft)^2 * 9/5 °C/F * (1/1055) * BTU/J = 0.5706 m2.°C/W

So the conversion from °Fahrenheit to °Celsius was not done correctly

Note that the Emperical unit for Fouling Factor is hr.ft2.°F/BTU and not hr.ft.°F/BTU

#4 Ghasem.Bashiri

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Posted 25 November 2008 - 04:08 AM

Dear My Friends
I remember from High school that Delta °F=1.8 Delta °C and in heat transfer equation we have Delta of Temperature and Not temperature only.
Is it correct.
Ghasem


#5 gvdlans

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Posted 25 November 2008 - 04:32 AM

QUOTE (Ghasem.Bashiri @ Nov 25 2008, 10:08 AM) <{POST_SNAPBACK}>
Dear My Friends
I remember from High school that Delta °F=1.8 Delta °C and in heat transfer equation we have Delta of Temperature and Not temperature only.
Is it correct.
Ghasem

... so (Delta °C)/(Delta °F) = 1/1.8 = 5/9

As I showed in my previous post you have to multiply with (Delta °C)/(Delta °F), so you have to multiply with 5/9 (which is the same as dividing by 1.8)...

#6 rajanpg

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Posted 29 January 2009 - 05:31 AM

Dear Friend,

I am trying in my unit conversion calculator, the HYSYS report of fouling factor is correct. please check your conversion value

By
Rajan

QUOTE (Ghasem.Bashiri @ Nov 24 2008, 08:26 AM) <{POST_SNAPBACK}>
Dear Colleagues
A very simple problem: As you may know TEMA proposed some recommendation about fouling factor within his standard. Unit of these proposed values are hr.ft2.°F/BTU.
When I insert this data within HYSYS environment these software change them into SI unit.
I try to manual perform unit conversion but I colud not reach to HYSYS values.
Do you have any experince about this item.
For example for TEMA value of 0.001 hr.ft.°F/BTU, HYSYS predict 0.000176 m2.°C/W but with unit converstion I get 0.00057 m2.°C/W (Refer to attachment)
A.Bashiri
Tehran Iran
Ghasem.Bashiri@gmail.com






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