6 replies to this topic

[WEEWA]

DEAR MY FRIEND
I NEED PROBLEM FOR HELP. MY PLANT TRIED TO MANAGE ENERGY CONSERVATION. AND I WANT TO CALCULATE HEAT LOSS AT FLANGE ,MANHOLE , VALVE , NOT HAVE INSULATION CAN YOU TELL ME ABOUT FORMULA TO CALCULATION HEAT LOSS.
THANK YOU VERY MUCH

[Qalander (Chem)]

DEAR MY FRIEND
I NEED PROBLEM FOR HELP. MY PLANT TRIED TO MANAGE ENERGY CONSERVATION. AND I WANT TO CALCULATE HEAT LOSS AT FLANGE ,MANHOLE , VALVE , NOT HAVE INSULATION CAN YOU TELL ME ABOUT FORMULA TO CALCULATION HEAT LOSS.
THANK YOU VERY MUCH

Dear WEEWA Hello/ Good Morning,
Firstly avoid shouting at everyone else(stop use of Block Capitals)&clarify your background!
General heat transfer formula is Q=UXAXTemperature difference

"Q" is the Heat transfered,
"U" is the Heat transfer Coefficient for particular material invoved,
"A" is area available for(exposed to) heat transfer
"Temperature difference" between Inner(hotter) surface & 'Prevalent ambient(colder) temperatures'

Hope this helps
Qalander

[ankur2061]

DEAR MY FRIEND
I NEED PROBLEM FOR HELP. MY PLANT TRIED TO MANAGE ENERGY CONSERVATION. AND I WANT TO CALCULATE HEAT LOSS AT FLANGE ,MANHOLE , VALVE , NOT HAVE INSULATION CAN YOU TELL ME ABOUT FORMULA TO CALCULATION HEAT LOSS.
THANK YOU VERY MUCH

Dear WEEWA Hello/ Good Morning,
Firstly avoid shouting at everyone else(stop use of Block Capitals)&clarify your background!
General heat transfer formula is Q=UXAXTemperature difference

"Q" is the Heat transfered,
"U" is the Heat transfer Coefficient for particular material invoved,
"A" is area available for(exposed to) heat transfer
"Temperature difference" between Inner(hotter) surface & 'Prevalent ambient(colder) temperatures'

Hope this helps
Qalander

Dear Qalander,

What you have mentioned is the general equation for heat transfer from heat exchange equipment. The person is asking for heat loss from piping systems, and that is where what you have mentioned does not apply.

Weeva:

Look at the following threads for heat loss from piping systems and equipment which gives equations for calculating heat loss:

http://www.cheresour...amp;qpid=25482#

http://www.cheresour...art=#entry20822

The basic issue in my opinion is whether the exercise is worth doing since in any piping/equipment heating system involving some heat transfer fluid (jacketed piping or equipment), the flanged connections including valves are normally kept uninsulated for the sole purpose of detecting leaks of the heating medium, since the flanges, bonnets and gland packings are potential leak points and need to be detected immediately in case of a leak. Naturally, if these are covered with insulation it will be very difficult to detect any leakage.

Be assured, that these uninsulated portions constitute a very small percentage of the total system surface area to be heated and any heat loss through the same can be practically neglected. However, if you still feel that this exercise needs to be done you can calculate the heat loss as per the method outlined in the above mentioned threads.

Happy calculating.

Regards,
Ankur.

[Qalander (Chem)]

DEAR MY FRIEND
I NEED PROBLEM FOR HELP. MY PLANT TRIED TO MANAGE ENERGY CONSERVATION. AND I WANT TO CALCULATE HEAT LOSS AT FLANGE ,MANHOLE , VALVE , NOT HAVE INSULATION CAN YOU TELL ME ABOUT FORMULA TO CALCULATION HEAT LOSS.
THANK YOU VERY MUCH

Dear WEEWA Hello/ Good Morning,
Firstly avoid shouting at everyone else(stop use of Block Capitals)&clarify your background!
General heat transfer formula is Q=UXAXTemperature difference

"Q" is the Heat transfered,
"U" is the Heat transfer Coefficient for particular material invoved,
"A" is area available for(exposed to) heat transfer
"Temperature difference" between Inner(hotter) surface & 'Prevalent ambient(colder) temperatures'

Hope this helps
Qalander

[ankur2061]

Dear Qalander,

You wanted to say something and seem to have forgotten.

Can I help you in any way.

Regards,
Ankur.

[Zauberberg]

Weewa,

You can download one quite handy tool (3E Plus) and check the performance/heat losses of insulated and non-insulated systems:

http://www.pipeinsul...4/download.html

Just register yourself and download the package. It's a product of North American Insulation Manufacturers Association (NAIMA), and it is absolutely free of charge. Very user friendly, and with an option to expand the existing database with user-provided data.

[Qalander (Chem)]

Weewa,

You can download one quite handy tool (3E Plus) and check the performance/heat losses of insulated and non-insulated systems:

http://www.pipeinsul...4/download.html

Just register yourself and download the package. It's a product of North American Insulation Manufacturers Association (NAIMA), and it is absolutely free of charge. Very user friendly, and with an option to expand the existing database with user-provided data.

Dear Friend Zauberberg, Thanks Very much indeed! for sharing useful info.
Best regards
Qalander