HDD vs. Fuel UsedPosted: December 2, 2013
Above is a scatter plot of Heating Degree Days (HDD) taken from Weather Underground data from the weather station in Springfield VT. Not exactly Newport, NH but close enough for this graph. It’s important to note that the beginning of October was quite nice which resulted in a fair number of days of timed burns, starting the boiler at 4 pm and running it until 9 pm for example. It quickly became obvious with Novembers below average weather that this would not result in satisfactory comfort and the boiler has been running continuously for most of the month. The trend-line looks like you would expect to see it, but the scatter data is quite varied. It will be interesting to see if this data correlates better as the winter continues.
The total pounds of fuel burned Heating season to date: 92 bags @40 pounds/bag= 3680 pounds vs. a total HDD to Date of 1444. Last year’s data for December indicates a HDD total for the month of 1069. This should result in 68 bags burned for the month for a total of 2720 pounds. Using $215 per ton this should be a monthly cost of $292.40 This is both heat and hot water. Be interesting to see at the end of the month how close the prediction comes.
You may remember I added a function to collect HDD data at one point, however it never seemed to work as well as it should have so I stopped using it, I am now considering reviving a variation of that function using an array for the max and min hourly numbers to get a more accurate HDD local number. I’ll post the code when I finish.