calculating gas rates

[beesley121]

hi guys,

doin my ACS in the next few weeks but im stuck on how to work out gas rates. its a pretty simple formula but i think im putting my meter readings in wrong and getting some silly answers

anyway, meter reading at start 0559068*0*, meter reading after 2mins 0559081*0*

can someone please tell me what the gross kW is please thanx

PS. i think it has something to do with were i need to put a decimal point, so can someone tell me where im supposed to put this to make this eqation work

 

[kirkgas]

hi guys,

doin my ACS in the next few weeks but im stuck on how to work out gas rates. its a pretty simple formula but i think im putting my meter readings in wrong and getting some silly answers

anyway, meter reading at start 0559068*0*, meter reading after 2mins 0559081*0*
can someone please tell me what the gross kW is please thanx

PS. i think it has something to do with were i need to put a decimal point, so can someone tell me where im supposed to put this to make this eqation work

the first thing is to look carefully at the meter and identify where the decimal point is on the screen, from your second reading i would assume it is after the 9, ie 0559.081-0559.068 = 0.013m3 of has used, there are variuos calculations but the quickest is to multiply gas used in 2 mins by 321, therefore in your example 0.013x321= 4.173kw,
the formula/calculation is fairly straight forward, but you seem to be faltering at taking a meter reading

 

[beesley121]

i too got this answer!! but it has to be wrong

i used an ideal isar HE24 condensing boiler so i could work out the gas rate on it. I had the hot tap on whilst carrying out this test. i dont have the manufacturers instructions but on the boiler it says heat input is 27.0kW gross

any ideas whats up ar have i just got this whole thing wrong??

 

[kirkgas]

i too got this answer!! but it has to be wrong

i used an ideal isar HE24 condensing boiler so i could work out the gas rate on it. I had the hot tap on whilst carrying out this test. i dont have the manufacturers instructions but on the boiler it says heat input is 27.0kW gross

any ideas whats up ar have i just got this whole thing wrong??

simplest thing is to do it again, the 24 in ISAR 24 is the input in kw so we know what size the boiler is, google and get the MI which will give you the exact gas rate, a lot of the new boilers give the gas usage per hr, so you can use that figure and divide it by 30 which should be the same as the gas used over your 2min test

 

[beesley121]

simplest thing is to do it again, the 24 in ISAR 24 is the input in kw so we know what size the boiler is, google and get the MI which will give you the exact gas rate, a lot of the new boilers give the gas usage per hr, so you can use that figure and divide it by 30 which should be the same as the gas used over your 2min test

i have tried to get hold of the manual mate but i can only get the users manual which doesnt show the consumption. any free websits where i can grab the installers guide

 

[CMairiD]

Give this site at try: Index The Isar is there.

 

[kirkgas]

you will def get it from ideal's own site, they have 2 parts, one for current models and one for older appliances,

 

[kirkgas]

i too got this answer!! but it has to be wrong

i used an ideal isar HE24 condensing boiler so i could work out the gas rate on it. I had the hot tap on whilst carrying out this test. i dont have the manufacturers instructions but on the boiler it says heat input is 27.0kW gross

any ideas whats up ar have i just got this whole thing wrong??

if you are multipying gas used in 2 mins by 321 you cant get it wrong, IF you are using an E6 meter and you are taking accurate reading, do it again and see what you come up with

 

[Toddyplumb]

Just as an aside from your figures , and not wanting to seem pedantic, the gas rate will be in m3 the kW is the heat input.

 

[tamz]

a lot of the new boilers give the gas usage per hr

Kirk
Just to confuse things Idea usually quote their gas consumption in l/s and ft3/hr

Beesly121

Maybe the gas run to the boiler is in 10mm .
Check your meter readings again.

 

[GrahamM]

hi guys,

doin my ACS in the next few weeks but im stuck on how to work out gas rates. its a pretty simple formula but i think im putting my meter readings in wrong and getting some silly answers

anyway, meter reading at start 0559068*0*, meter reading after 2mins 0559081*0*

can someone please tell me what the gross kW is please thanx

PS. i think it has something to do with were i need to put a decimal point, so can someone tell me where im supposed to put this to make this eqation work

the first thing is to look carefully at the meter and identify where the decimal point is on the screen, from your second reading i would assume it is after the 9, ie 0559.081-0559.068 = 0.013m3 of has used, there are variuos calculations but the quickest is to multiply gas used in 2 mins by 321, therefore in your example 0.013x321= 4.173kw,
the formula/calculation is fairly straight forward, but you seem to be faltering at taking a meter reading

Was looking at this thinking something not quite right.
Doesn't a standard E6/G4 meter have 5 main digits before the decimal point?
Looks to me it should be something like:
05590.810-05590.680=0.13x321=41.73kw

Away to the other extreme but I was just outside at 2am checking my own meter and there are 5 digits before the decimal.

beesley121 you may have to take a photo of your meter to give us an idea as something is wrong in your readings somewhere.

 

[kirkgas]

Was looking at this thinking something not quite right.
Doesn't a standard E6/G4 meter have 5 main digits before the decimal point?
Looks to me it should be something like:
05590.810-05590.680=0.13x321=41.73kw

Away to the other extreme but I was just outside at 2am checking my own meter and there are 5 digits before the decimal.

beesley121 you may have to take a photo of your meter to give us an idea as something is wrong in your readings somewhere.

my first calculation was using this reading, but as you say gives a HI of 41kw and he has an ISAR 24, so i moved the decimal point in one, we really need him to go back to the meter and take another reading, maybe when he ran the water then went to the meter the flow slowed down on the tap reducing the load or something

 

[jambo]

def got the point wrong 5 numbers before dec point