looking for help on home heating math

[Crash5291]

Hey,

I'm looking to figure out some stuff because i think my furnace is messed, It seems like i am using insane amounts of fuel


500 degree days in the one month time frame from Jan 19th untill Feb 20th

i used 780 liters of LPG or
780 liters = 206.054201 US gallons

the place is 1219 Sq ft roughly 8533cubic ft Double wide
New windows and doors 5 Years ago
sealed crawl space with 1" styro on walls
how do i figure out just how bad it is?

[jim147]

You kept it at 500º and only used 200 gallons of propane?

That's pretty good in my book.

I'm guessing five zero degree days, but what was the average temp?

jim

[seatonheating]

You kept it at 500º and only used 200 gallons of propane?

That's pretty good in my book.

I'm guessing five zero degree days, but what was the average temp?

jim


I think he meant 500 heating degree days. I'm too tired to do math right now.

[oregonhvac]

It has been sometime since I have worked with LPG, but I think one gallon of propane is about 92,000 btu's. What is your furnace input in btu's? If your input was 92,000 btu's then every hour of run time would consume a gallon of propane. So it looks like you have between six to seven hours of run time per day, and that sounds about right. Do you have any other appliances that run on propane? Maybe you should look into a straight electric furnace, it may be cheaper than the propane? I don't know if this helps you any, but good luck?

[lynn comstock]

Oregonhvacs numbers look good to me.

LPG is a hydrocarbon mixture in either liquid or gaseous state where the main components consists of
•propane - C3H8 = 91,600 but varies
•propylene (propene) - C3H6
•isobutane - C4H10
•n-butane - C4H10
•butylene (butene) - C4H8
The heat content depends on the blend of gasses which varies with the blend.

Using your numbers:
500 heating degree days HDD in a 30 day month at a 65*F indoor temp would mean that the average temperature was 16.7*F colder than 65*F or 48.3*F
(16.7 degree days per day times 30 days = 500 Degree Days.)

Was it really that warm in Ontario?
Your daily use averages 200 gal/30 days = 6.7 gallons per day

[jim147]

I think he meant 500 heating degree days. I'm too tired to do math right now.

Well that makes a little more sense. And the fact I haven't been drinking for hours.:cheers:

jim

[Crash5291]

Thanks guys

I will need to look as im not sure on the btu of the furnace but it is the only item on the system.

[Crash5291]

Furnace is a Ultra SX 90
Direct Vent Forced Air Furnace - Category IV - Type FSP
GH90A100D20-1A

sticker claims 100,000 BTU/H Natural Gas

Ya it hasn't been a cold winter we had a couple days that were cold but mostly warm