Relating to gas, gas rates and heat inputs?

[Killy Bing]

Hey guys, just about to do my acs training in a week or so as part of my apprenticeship!

just a little thing playing on my mind

difference between heat inputs and gas rates ?

in my mind heat input is working out the kw from gas burned in two minutes(metric) or one rev (imperial)

And gas rate is gas burned per hour in m3 or ft3 per hour ?

thanks for help given

youre also welcome to thow anything at hand at me....

Billy

p.s did use search but just come up with calculation requests

 

[kirkgas]

HI is measures in kw and gas rate is gas used (measured in m3/hr)
there are various ways to work it out, the more complex the calculation the more anal the trainer haha

on E6 metric measure gas used in 2 mins x 30 = gas rate (m3/hr)
on E6 meter measure gas used in 2 mins x 321 = HI (Kw) then divide by 1.1 to get Net
sometimes you need one or the other sometimes both

on U6 imperial measure how many seconds it takes to burn 1ft3 of gas (one complete rev of the dial) divide 3600 (secs in 1hr) by the time taken to burn 1ft3 (this gives gas rate in ft3/hr, multiply by 0.028 to convert to kw
on U6 imperial measure how many seconds it takes to burn 1ft3 of gas (one complete rev of the dial) divide 1097/time in secs to burn 1ft3 this gives HI (in Kw) divide by 1.1 to get Net


easy peasy

 

[tamz]

easy peasy

Aye. Easy for you ;-)

 

[Killy Bing]

Thanks kirk !!!!

 

[leelister6]

This has some decent stuff on it free gas training downloads

 

[kirkgas]

Tamz it is easy for me it's carrying a 1600x600 k2 up 3 flights of stairs that I can't do now


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[Killy Bing]

Thanks guys, was remembering the calculations off the top of my head by the end of the day.

also heard it mentioned there is roughly 10.72 kw of heat in 1m3 of gas ?

so if an applience say burned 1.4m3 per hour it would make it 15.008 kw gross appliance ? Am i correct in this ?

 

[heliotrope]

so if an applience say burned 1.4m3 per hour it would make it 15.008 kw gross appliance ? Am i correct in this ?

Probably............I use a chart!

 

[kirkgas]

Thanks guys, was remembering the calculations off the top of my head by the end of the day.

also heard it mentioned there is roughly 10.72 kw of heat in 1m3 of gas ?

so if an applience say burned 1.4m3 per hour it would make it 15.008 kw gross appliance ? Am i correct in this ?

if you have HI multiply it by 0.094 to give you gas rate in m3/hr
if you gas rate an appliance you then divide the gas rate by 0.094 to give you HI in kw
close enough to make a judgement on it being safe to leave on

 

[kirkgas]

Probably............I use a chart!

i can work it out quicker than i can read the chart in the bpec A5 size book haha

 

[AlexGas]

Hi Billy,

Yes, it’s correct. 1m3 of gas will give you about 10.72kW of energy (depends where you are).
Why don’t you keep it simple, so you understand how it works?
Check your books. It’ll be: Heat Input = Gas Rate x Calorific Value.
Can you see the difference now?
I guess you know how to work out the Gas Rate.
So, 1.4m3 x 10.72 = 15.008kW you are correct again.


Top marks!

 

[AlexGas]

And gas rate is gas burned per hour in m3 or ft3 per hour ?

Both, you always can convert your imperial set up into the modern money.

 

[Kev the gas]

i can work it out quicker than i can read the chart in the bpec A5 size book haha

"A4 " its the way to go as we get older :29:

 

[chikodaplumba]

Get the app on your phone, no sore heads ever again!!!

 

[johnnyplumb]

Get the app on your phone, no sore heads ever again!!!

no phones allowed during your acs, what you gonna do then :disappointed:

apps are ok, but every now and then, it's better to get the pencil & paper out, so you dont forget how to do it

 

[chikodaplumba]

I agree, but an app is just a different kind of scewdriver or spanner!

 

[Killy Bing]

Thanks again guys !!!! I have the app and charts but even so, its great having all the calculations sat in your head !!!! If you forget your phone or away from your car/van but you have paper and pen to hand

 

[SafeGasInstall]

Tamz it is easy for me it's carrying a 1600x600 k2 up 3 flights of stairs that I can't do now


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it could be worst there is a K3 option this days