Gas Bill

Gordy

I recieved my gas bill for the 60 day period yesterday.

330.95 therms total and 1062 degree days for period.

330.95-133.2(therms for water heater and gas light)=197.2 therms dedicated to my boiler.

197.2 therms / 1062 degree days =.186 therms per degree day

.186*100,000=18,600 Btus per degree day.

18,600 Btus per degree day/ 3925 sq.ft. conditioned space=4.74 Btus a sqft. per degree day.

4.74-18% for the Gross boiler input=3.89 Btus a sqft. per degree day. Would indicate actual heatloss of the dwelling.


Does this seem like the right approach? If so is 3.89 Btus sqft.per degree day a fair number for gas consumption?

Thanks for your help
Gordy

Ken_8

More importantly...

What are you trying to calculate? The number of BTU's expended per square foot to heat your home?

Right church; wrong pew.

Easy way: Turn off your water heater for 24 hours. Don't cook on the stove (use the microwave like the rest of us (:-o), take outdoor temperature readings as frequently as possible to get an accurate "average" 24 hour outdoor temp. Record beginning and ending (24 hr.) gas meter readings.

One skewing factor? Substantial outdoor temperature swings just before the 24 hour data collection period could impact the "thermal mass" base line structural temps and skew the first 4-8 hours of testing. The day before the test period should be nearly alike with the actual test day to assure little to no thermal loading of walls and large mass components.

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Gordy

Ken

I'm just trying to get a handle on how my gas consumption fairs to a more modern radiant system, or not so much the radiant end but the boiler and controls. Trying to decide on upgrading to a condensing modulating boiler, but will it warrant removing a perfectly good operating boiler at present. So what I'm trying to come up with here is a comparitive number "Btus a square foot per degree day" that could be an apples to apples approach.


It twas early this mornin in my thinking so bare with me. I could deffinitly be at the wrong pew. I know what I'm consuming with the water heater and the Gas Light which thats all I have besides the boiler on gas.So is there some other method to kinda give an up front idea of savings with older boiler versus condenser. I have seen alot of % thrown around after the install.

Gordy

Mark Eatherton1

Gordy...

What is the current configuration of your system, and how is it being controlled.

ME

oil-2-4-6-gas

.

gas light --?

Gordy

Mar k

Pretty simple actually Mark. Single T-stat for dwelling, One B&G HV circulator for whole system, simple boiler bypass with a taco paneltrol mixing valve, and one "GROSSLY" oversized WM CGM 7 boiler,but lets not open that can of worms. That would be a thread "always do a heatloss calc." Ceiling radiant and floor radiant emitters. System temps are 100* supply after mixing valve,upper 80's return in the shoulder season. when it gets down around design it will run 115* supply and upper 90's return.

I came up with a 89000 btu heatloss with slant fin,I think its even less than that. I don't know where the guy got his numbers for a 172000 btu boiler from. Well I do but thats another discussion.

Thanks Gordy

Gordy

Oil-2-4-6-8-Gas

Its an outdoor double mantel lamppost from the 50's Novel. Sheds good light on the parking lot though.


Gordy

Gordy

See thread

See thread "1 st gas bill with new Vitodens". Mike figured Btus per degree day except he did not break it down to btus per square ft. He would be at 4.92 per square ft I'm at 4.74 before knocking off what goes up the stack. My square footage includes all areas where there is radiant so I have a portion of my basement in my calcs.
Gordy