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Coût de la perte de chauffage due à la ventilation

Heating $/hr=(.154 x CFM x (dg) x T x C)/q

Enter CFM exhausted to the outside: CFM =  
Enter hours worked per week - T: T =
Enter available BTU per unit - q (see table below): q =
Enter cost of fuel $/unit - C (see table below): C =
Select desired air temp and enter annual
heating degree-day normal - dg (see table below): 		dg =
Cost of Heating Loss per year - $ - : $

Available BTU (q) and Cost Per Unit Of Fuel (C)
Fuel Type Unit Of Measure Available BTU
Per Unit (q) 		Average Cost
Per Unit $ (C)
Coal Lb. 6000 0.0522
Oil Gal. 106500 2.52
Gas Heat Exchanger Cu.Ft. 800 0.01664
Gas Direct Fired Cu.Ft. 900 0.01664

Annual Heating Degree-Day Normals (dg)
Air Temp F Albany Boston Chicago Cleveland Detroit Minneapolis
80 11782 10409 10613 11343 10959 13176
78 11062 9690 9940 10621 10256 12478
76 10356 8994 9283 9915 9581 11797
74 9669 8317 8656 9229 8920 11142
72 9007 7668 8046 8567 8291 10496
70 8364 7046 7468 7928 7678 9870
68 7750 6458 6905 7313 7100 9269
66 7162 5903 6373 6722 6543 8687
64 6607 5370 5875 6165 6020 8131
62 6081 4873 5399 5636 5533 7590
60 5586 4399 4936 5140 5054 7086
Air Temp F   N.Y. Philadelphia Pittsburgh St. Louis Wash.,D.C.
80   9284 9652 10797 8943 8422
78   8596 8954 10076 8310 7764
76   7938 8285 9379 7702 7139
74   7308 7641 8702 7121 6538
72   6706 7028 8050 6560 5974
70   6146 6438 7429 6023 5438
68   5606 5886 6833 5523 4929
66   5101 5360 6272 5053 4455
64   4621 4864 5734 4595 4014
62   4176 4397 5234 4168 3588
60   3747 3952 4769 3761 3182