AC,
The degree days in Farenheit 5-year average and a base temperature of 65F are below.
HDD % Estimated
Jan 778 11
Feb 710 6
Mar 708 7
Apr 603 6
May 518 7
Jun 401 8
Jul 301 8
Aug 291 8
Sep 366 6
Oct 546 8
Nov 627 8
Dec 814 8
Total 6663 8
I've worked out my oil consumption averaged over 8/2007 to date and have come up with 10.12 ltr (3.8 gal) per day. Assuming 135,000 BTU for Kerosene that works out at 11,278BTU per hour (75% efficient, non condensing boiler)
As for construction, size etc, the house is on two stories, 970sq ft upstairs and 1300 down stairs. Construction split between the older front portion of the house, 1370 sq ft which is mass concrete, walls approx 18" thick with air gap of a couple of inches then 4" fiber glass insulation before the surface finish of plasterboard.
The rear of the house, 900 sq ft is constructed of 313mm Beco wallform blocks with a polymer render on the outside and fiber reinforced concrete core and plasterboard finish on the inside. (5.44msqK/W). The roof over the older part of the house is traditional slate over close boarded timber and 4" of fiberglass insulation. The roof on the new part of the house is Jablite Slimfix SIP with Decra outer covering, all sitting on three parabelum composit beams, for a U value of 0.2.
Just writing this description and looking through all the documentation generated from when we had the addition built, I can see that as well as fitting radient floor heating to the front portion downstairs, the insulation in the old roof and the older exterior walls certainly has some scope for improvement.
Jim
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