Cost of gas per cu ft


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Old 10-05-06, 01:53 PM
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Cost of gas per cu ft

I'm trying to do a fuel cost analysis of natural gas vs oil for a steam boiler and I'm having trouble to determine the proper figure to input for the gas cost.

This is the calculator I'm using:

http://www.warmair.net/html/fuel_cost_comparisons.htm

The oil portion I understand, but I'm not sure what I'm paying for gas.

This is how my latest bill breaks down:

Difference in meter: 37
Conversion to CCF: x 1.0120
CCF Total: 37.444
Conversion to Therms: x 1.03700
Total Therms: 38.829

Service charge: $5.84
Distribution charge: (38.829 therms @ $0.3005486) $11.64
BGSS commodity: (38.829 therms @ $1.07368200) $41.96

Total Gas Charges: $59.20
--------

So what do I use as a cost per cu ft?
 
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Old 10-05-06, 05:38 PM
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Cost/ cu.ft.

Your cost per cubic foot would be $0.0158102 (virtually 16 cents).

CCF = 100 cu.ft.
You used 37.444 CCF or 3744.4 cu.ft. at a cost of $59.20.
$59.20 divided by 3744.4 equals $0.0158102 per cu.ft.
 
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Old 10-05-06, 06:15 PM
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$0.016 is virtually two cents.

Just my $0.02.
 
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Old 10-05-06, 06:30 PM
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Red face I stand corrected

Thanks Xiphias, I knew sixteen cents was way too high. Daind bread or brain dead or just plain tired, I dunno. Thanks again.
 
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Old 10-05-06, 08:50 PM
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Thanks for the help.

I must say, I'm quite surprised to learn how much cheaper gas is in my area (NJ)

For oil I used a price of $2.40/gal @ 85% Efficiency

For gas I used $0.016 @ 92% Efficiency

This yields a cost per 100,000 btu useable heat of:

Oil - $2.05
Gas - $1.69

I thought oil was supposed to be cheaper than gas these days. Anything in my numbers suspect?
 
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Old 10-06-06, 07:47 AM
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Grady's approach is correct. Divide the total bill into your ccf. A couple points to consider.

1) I don't think there's a 92% efficient steam boiler. I think both gas and oil will be around 85% efficient. You really only get efficiencies >85% using a condensing or modulating/condensing boiler. Can't do either of that with steam, I believe. There are other ways to optimize performance of steam systems, but in terms of combustion efficiencies, I think 85% is tops.

2) I suggest using the total cost of the gas bill to figure cost per cubic foot as Grady did. Those delivery and service/distribution/whatever charges don't just disappear. They are part of the cost of energy.

The counterexample is oil. If you are getting oil for $2.40/gal, that presumably includes the overhead of the oil company to put a guy in a truck, drive it to your house, fill your tank, etc.

I don't know how the warmair site does the math, but using their site I get

gas $1.83
oil $2.05

per 100,000 BTU usable heat. I specified 85% efficiency for both gas and oil appliances, a gas cost of $0.016/cf and oil $2.40/gal.
 
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Old 10-06-06, 10:35 AM
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Well thanks for that help.

And still gas is cheaper by ~10%. And the $2.40 figure for oil is probably a low estimation. I know people who locked in a moth ago at around $2.89.

So is my NJ NG cheaper than most, or is our oil high? Or has NG dipped lower than oil on the whole?
 
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Old 10-06-06, 12:40 PM
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Beats me. I don't follow regional energy prices.
 
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Old 10-06-06, 03:09 PM
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Fuel prices

Fuel oil in my area is going for $2.00-$2.25/gallon.
 
 

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