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aikhh
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Join Date: Mar 2009
Posts: 130

Electrical Heaters vs. Natural Gas Burners

03/23/2009 1:47 AM

Dear all Guru,

I hv an electrical heated oven which divide in to 4 heating zones (2.2m x width 3m x height 0.8m ,each zone) with total lenght of 8.8m, each zone is run by 170kw heater and connected to 3ph 415v + Nuetral power supply.(heater control by ON/OFF contactor only)

The starting all the heater will be on , so 170kw x 4 = 680kw

Now if i want to convert to Natural gas fired burner , gas pressure at 100mBar , pipe size 1 1/2".

Please adivse me what is the burner heating capacity for each zone ? and waht is max. gas flow speed in the pipe 1 1/2" ?

Thank You and Best Regards
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Electrical heater Vs Natural gas burner heating

03/23/2009 4:30 AM

What is the calorific value of the gas to be used?

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aikhh
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Join Date: Mar 2009
Posts: 130
#2
In reply to #1

Re: Electrical heater Vs Natural gas burner heating

03/23/2009 4:36 AM

Hi PWSlack,

NG CV is 9580kcal/sm³

Thanks
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
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#3
In reply to #2

Re: Electrical heater Vs Natural gas burner heating

03/23/2009 5:47 AM

aikhh

Electric heaters are 100% efficient as the element is in the oven you are heating. This is unlikely to be the case for gas heaters, but the efficiency depends on the arrangement and you need to discuss with the heater supplier. When you know that you can calculate the gas flow hence velocity in 1½" pipe.

Presumably you need a separate heater for each zone. Supplier will tell you connection size and minimum pressure requirement. You can then check whether your gas pipe and system are adequate.

Cheers......Codey

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