Forsyth MO: It was august the 12th and so I was arguably in late summer. I thought it might be of historical interest (at least to myself) to take a gander at the power use curves I was experiencing.
Following are the ground parameters:
Space to be cooled = 900 square feet with a volume of about 7,200 cubic feet.
3.5 ton 2 stage AC unit set to maintain 81F.
Blinds were generally closed.
Normal power use items always on - Computer equipment, fans, flat screen TV
Power appliances cyclical: water heater, refrigerator
Occasional use: Convection stove top, microwave, washer and dryer
The following scatter chart reflected energy consumed as compared to the average outdoor temperatures over a period of 8 days where the daily highs ran a gauntlet from 88 up to 96 degrees. Nighttime temperatures averaged from 60 to 68F. In other words a pretty typical period with partly cloudy skies thrown in for good measure.
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| Click to enlarge |
Understanding that my baseline of power use (ie the average consumed with no AC used) was at about 14 kilowatt hours a day, the trend line that was generated using a scatter chart (avg temp vs kwh) correlated rather well. My average daily use of 25.5 kWh's indicated that my electric bill was going to be ((25.5*30)*.13006) +15 or $115. Not too bad as the average internal temp in the condo ranged from 81 to 84 degrees. Note that whenever the average daily temp drops below 74 degrees, I normally have the AC turned off and so follow a power use level that results in electric bills below $100.
