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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Britih Gas: Cubic Feet to Cubic Matres
For many years I've only checked the 'readings' on my quarterly Gas Bill and
not bothered to perform the calculations leading to the money bill. However having recently completed a change of plumbing circuitry, I've become an 'anorak' about gas consumption and I've been reading the meter everyday. My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of ..... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. Given that one cubic foot is 12 in x 12 in x 12 in and that one cubic metre is 39.37 in x 39.37 in x 39.37 in, I can't reconcile where the 'multiply by 2.83' statement originates. Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Any body with an explanation? -- Brian *There are valid reasons not to divide something in software. Unless steps are taken to validate the divisor a divide operation _might_ lead to a 'Divide by Zero - illegal operation' and cause a run to halt. It's much safer to multiply by a reciprocal ; e.g. don't divide by four, rather multiply by. 0.25. Guess what the 'reciprocal' in this case [12^3 / 39.37^3] is ... how many decimal places? -- Brian |
#2
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Britih Gas: Cubic Feet to Cubic Matres
On Sun, 24 Sep 2006 21:12:12 UTC, "Brian Sharrock"
wrote: My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of .... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. 100 cubic feet is 2.83 cubic metres. I'd bet that the meter registers in hundreds. -- The information contained in this post is copyright the poster, and specifically may not be published in, or used by Avenue Supplies, http://avenuesupplies.co.uk |
#3
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Britih Gas: Cubic Feet to Cubic Matres
"Brian Sharrock" wrote in message ... For many years I've only checked the 'readings' on my quarterly Gas Bill and not bothered to perform the calculations leading to the money bill. However having recently completed a change of plumbing circuitry, I've become an 'anorak' about gas consumption and I've been reading the meter everyday. My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of .... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. Given that one cubic foot is 12 in x 12 in x 12 in and that one cubic metre is 39.37 in x 39.37 in x 39.37 in, I can't reconcile where the 'multiply by 2.83' statement originates. Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Any body with an explanation? -- Brian *There are valid reasons not to divide something in software. Unless steps are taken to validate the divisor a divide operation _might_ lead to a 'Divide by Zero - illegal operation' and cause a run to halt. It's much safer to multiply by a reciprocal ; e.g. don't divide by four, rather multiply by. 0.25. Guess what the 'reciprocal' in this case [12^3 / 39.37^3] is ... how many decimal places? 1 cubic foot =0.02831685 cubic metres |
#4
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Britih Gas: Cubic Feet to Cubic Matres
Brian Sharrock wrote:
My meter registers consumption in cubic feet. British Gas charges in KwH. Your meter probably reads in 100s of cubic feet which may go some way to explain the difference. The conversion: http://www.google.com/search?num=50&...rs&btnG=Search There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his 2.83 sounds more like it... Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Their explanation seems to be wanting somewhat! For 100s of cubic feet to m^3 however, the numbers look ok. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#5
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Britih Gas: Cubic Feet to Cubic Matres
Brian Sharrock wrote:
For many years I've only checked the 'readings' on my quarterly Gas Bill and not bothered to perform the calculations leading to the money bill. However having recently completed a change of plumbing circuitry, I've become an 'anorak' about gas consumption and I've been reading the meter everyday. My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of .... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. Given that one cubic foot is 12 in x 12 in x 12 in and that one cubic metre is 39.37 in x 39.37 in x 39.37 in, I can't reconcile where the 'multiply by 2.83' statement originates. Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Any body with an explanation? A cubic foot is 0.028316849999999997 of a cubic metre. There are 35.31466 cu feet in a cubic metre. 35.31466 X 0.028316849999999997 = 0.9999999993002099989405602 or 35.31 X 2.83 = 99.9273 Later on in the equation it must divide by 100 |
#6
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Britih Gas: Cubic Feet to Cubic Matres
In message , Brian Sharrock
wrote Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* The gas meter reading is in units of 100 cubic feet. You don't read the last two dials/figures when submitting a reading. 100 cubic feet = 2.831685 cubic meters. http://www.house.co.uk/cgi-bin/house...PopUpEditorial. jsp?BV_SessionID=HHHH1402320481.1159134046HHHH&BV_ EngineID=ccccaddilmfhhj kcefecfngdfhidfmi.0&_txtEdKey=meter_reading_gas_po pup&_txtPrintable=false &_linkKey=meter_reading_gas_popup&_strType=INLI NE -- Alan news2006 {at} amac {dot} f2s {dot} com |
#7
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Britih Gas: Cubic Feet to Cubic Matres
In message , Phil L
writes Brian Sharrock wrote: For many years I've only checked the 'readings' on my quarterly Gas Bill and not bothered to perform the calculations leading to the money bill. However having recently completed a change of plumbing circuitry, I've become an 'anorak' about gas consumption and I've been reading the meter everyday. My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of .... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. Given that one cubic foot is 12 in x 12 in x 12 in and that one cubic metre is 39.37 in x 39.37 in x 39.37 in, I can't reconcile where the 'multiply by 2.83' statement originates. Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Any body with an explanation? A cubic foot is 0.028316849999999997 of a cubic metre. There are 35.31466 cu feet in a cubic metre. 35.31466 X 0.028316849999999997 = 0.9999999993002099989405602 or 35.31 X 2.83 = 99.9273 Later on in the equation it must divide by 100 What IS the point of point of so many decimal places .... other than making you look a bit silly -- geoff |
#8
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Britih Gas: Cubic Feet to Cubic Matres
Phil L wrote:
snip A cubic foot is 0.028316849999999997 of a cubic metre. According to Google, 1 cubic foot = 0.0283168466 cubic meters. Which is correct? |
#9
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Britih Gas: Cubic Feet to Cubic Matres
raden wrote:
What IS the point of point of so many decimal places ... other than making you look a bit silly Especially in view of the fact that BG truncate the conversion factor to 2 decimal places (100 ft^3 = 2.83 m^3) and the meter's only accurate to about ±2% in the first place. -- Andy |
#10
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Britih Gas: Cubic Feet to Cubic Matres
raden wrote:
In message , Phil L writes Brian Sharrock wrote: For many years I've only checked the 'readings' on my quarterly Gas Bill and not bothered to perform the calculations leading to the money bill. However having recently completed a change of plumbing circuitry, I've become an 'anorak' about gas consumption and I've been reading the meter everyday. My meter registers consumption in cubic feet. British Gas charges in KwH. There is a 'conversion carried out to convert cubic feet (consumed) into cubic meters thence into KilowattHours. According to British Gas's helpful explanation on their bills and website; the cubic feet consumed is _multiplied_ by 2.38 (the website states that his step my be omitted if the meter registers in m^3) then transmogrifies into KilowattHours via a series of multiply by the number you first thought of .... As far as I can see: British Gas are stating that one cubic foot equates to 2.38 cubic metres! I've asked British Gas to confirm this but all I've got are flunky's responses that the 'equation' leads to a correct calculation of my bill. Given that one cubic foot is 12 in x 12 in x 12 in and that one cubic metre is 39.37 in x 39.37 in x 39.37 in, I can't reconcile where the 'multiply by 2.83' statement originates. Surely, a cubic-foot is smaller than a cubic-metre! Why multiply by 2.83?* Any body with an explanation? A cubic foot is 0.028316849999999997 of a cubic metre. There are 35.31466 cu feet in a cubic metre. 35.31466 X 0.028316849999999997 = 0.9999999993002099989405602 or 35.31 X 2.83 = 99.9273 Later on in the equation it must divide by 100 What IS the point of point of so many decimal places ... other than making you look a bit silly Or maybe the site I cut and pasted it from...what was the point of your post to this thread? - did it serve *any* purpose at all? |
#11
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Britih Gas: Cubic Feet to Cubic Matres
Grumps wrote:
Phil L wrote: snip A cubic foot is 0.028316849999999997 of a cubic metre. According to Google, 1 cubic foot = 0.0283168466 cubic meters. Which is correct? 0.028316849999999997 I use a British site, to avoid misunderstandings - Wiki says it's 0.028316846592 too, but this is ammended at will by members of the public http://www.gordonengland.co.uk/conversion/volume.htm There's dozens of calculators on that site and I've been using it for years, it's never let me down yet when ordering stuff. |
#12
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Britih Gas: Cubic Feet to Cubic Matres
"Andy Wade" wrote in message ... raden wrote: What IS the point of point of so many decimal places ... other than making you look a bit silly Especially in view of the fact that BG truncate the conversion factor to 2 decimal places (100 ft^3 = 2.83 m^3) and the meter's only accurate to about ±2% in the first place. -- Andy Jumping in again; I've studied my bills and their counterpart on the web. BG state that cons* = consumption in cubic feet. They cite my average cons* as approx 2 per day- the only figure quoted is four digits - not the two 'smaller red' digits So; somewhere BG are inconsistent - they don't quote cubic feet but _hundreds of cubic feet_. -- Brian |
#13
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Britih Gas: Cubic Feet to Cubic Matres
"Brian Sharrock" wrote in message ... "Andy Wade" wrote in message ... raden wrote: What IS the point of point of so many decimal places ... other than making you look a bit silly Especially in view of the fact that BG truncate the conversion factor to 2 decimal places (100 ft^3 = 2.83 m^3) and the meter's only accurate to about ±2% in the first place. -- Andy Jumping in again; I've studied my bills and their counterpart on the web. BG state that cons* = consumption in cubic feet. They cite my average cons* as approx 2 per day- the only figure quoted is four digits - not the two 'smaller red' digits So; somewhere BG are inconsistent - they don't quote cubic feet but _hundreds of cubic feet_. All imperial meters measure in 100's of cubic feet and often have a couple of dummy "00" figures after the ones you read on the meter to indicate this. Sloppy practice and the fact that the meters are or were labelled "Cubic Feet" (as they included the dummy "00" figures) but the dummy figures are ignored on readings has lead to the confusion (a bit like "Calories" actually being kCals). 100 cubic feet = 2.83 cubic metres so the calculation is correct. There is another thread here where the customer was bing charged as if they had an imperial meter when it was, in fact, metric and was refunded £750 (as I recall) so it's worth checking that if your meter is metric! -- Bob Mannix (anti-spam is as easy as 1-2-3 - not) |
#14
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Britih Gas: Cubic Feet to Cubic Matres
Phil L wrote:
Grumps wrote: Phil L wrote: snip A cubic foot is 0.028316849999999997 of a cubic metre. According to Google, 1 cubic foot = 0.0283168466 cubic meters. Which is correct? 0.028316849999999997 I make it 0.028,316,846,592 /exactly/. Start with 1 in. = 0.0254 m exactly, by definition. Multiply by 12, so 1 ft. = 0.3048 m exactly. Multiply the cube out longhand (ages since I've done that). 3048 * 3048 * 3048 = 28,316,846,592 Therefore 1 ft^3 = 0.028,316,846,592 m^2. QED. -- Andy |
#15
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Britih Gas: Cubic Feet to Cubic Matres
"Bob Mannix" wrote in message ... "Brian Sharrock" wrote in message ... "Andy Wade" wrote in message ... raden wrote: What IS the point of point of so many decimal places ... other than making you look a bit silly Especially in view of the fact that BG truncate the conversion factor to 2 decimal places (100 ft^3 = 2.83 m^3) and the meter's only accurate to about ±2% in the first place. -- Andy Jumping in again; I've studied my bills and their counterpart on the web. BG state that cons* = consumption in cubic feet. They cite my average cons* as approx 2 per day- the only figure quoted is four digits - not the two 'smaller red' digits So; somewhere BG are inconsistent - they don't quote cubic feet but _hundreds of cubic feet_. All imperial meters measure in 100's of cubic feet and often have a couple of dummy "00" figures after the ones you read on the meter to indicate this. "My" meter - A Schlumberger R5 - is marked ft^3: it displays four white digits and two smaller red digits with a analogue pointer marked with 0 at the top and 0.5 at the bottom. Sloppy practice and the fact that the meters are or were labelled "Cubic Feet" (as they included the dummy "00" figures) but the dummy figures are ignored on readings has lead to the confusion (a bit like "Calories" actually being kCals). 100 cubic feet = 2.83 cubic metres so the calculation is correct. It's really sloppy practise to declare that the cnsumption is in cubic feet when it's actually Hundred Cubic foot ! There is another thread here where the customer was bing charged as if they had an imperial meter when it was, in fact, metric and was refunded £750 (as I recall) so it's worth checking that if your meter is metric! No, the meter installed, yonks ago, is definitely registering cubic feet. -- Bob Mannix (anti-spam is as easy as 1-2-3 - not) -- Brian |
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