An observation of interest for those who track HDD's

 
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lsayre
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Post by lsayre » Sat. Jan. 02, 2021 8:25 am

Well that wasn't expected. By the end of December the months differential was only 0.36 degrees. I'm back to 0.4 degrees as a good figure.

Therefore:
(days_high + days_low)/2 - 0.4 ~= the integrated 'actual' average daily temperature

 
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Lightning
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Post by Lightning » Sat. Jan. 02, 2021 8:59 am

Maybe for whatever reason that's not typical and it go the expected direction in January. ;)

 
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Post by lsayre » Thu. Jan. 28, 2021 6:28 am

January isn't quite over yet, but so far the differential is once again 0.4 degrees (0.041 to be more precise), and a few more days are not likely to change things much for this month. I'm ending this data chasing endeavor and calling it 'on average' 0.4 degrees of difference between the methods of using (high+low)/2 and 24 temperature points integration.

Final answer: A days average temperature in degrees F. = (high+low)/2 - 0.4


 
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Post by lsayre » Thu. Feb. 11, 2021 9:29 am

Some funny things are happening so far in February:

1) It's actually gotten much colder outside here
2) I lied about giving up on accumulating hourly integration vs. (high/low)/2 average temperature data
3) There has been a highly noticeable inversion of the difference between the two methods

February to date: A days average temperature in degrees F. = (high+low)/2 + 0.68

I think I have come up with a reason for the inversion. I've noticed that for February the hour in which the coldest single moment of the day occurs is not blending smoothly into the remaining 23 hours temperature readings, but rather the single daily low temp spikes downward abruptly and then springs up again, also abruptly, meaning that almost every day of this month has only been within the ballpark of its coldest "moment" for a very brief period of time. Thus integration is now suddenly and unexpectedly "downplaying" the coldest moment as opposed to "emphasizing" it.

 
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Post by freetown fred » Thu. Feb. 11, 2021 11:22 am

Larry, what's an HDD??????????????????????????????

 
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Post by Rob R. » Thu. Feb. 11, 2021 11:25 am

freetown fred wrote:
Thu. Feb. 11, 2021 11:22 am
Larry, what's an HDD??????????????????????????????
https://www.eia.gov/energyexplained/units-and-cal ... e-days.php

In short, it is a way to quantify your heating load based on the difference between the indoor and outdoor temperature.


 
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freetown fred
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Post by freetown fred » Thu. Feb. 11, 2021 11:29 am

Hmmmmm, my indoor temp is always warmer then outside temp!! I guess that covers all I need to know about HDD's-- I done good huh??? Thanx for the simplistic explanation Rob. :)

 
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Post by warminmn » Thu. Feb. 11, 2021 1:08 pm

A couple years ago I played around on one of those sites and I found the HDD thingy interesting to compare other locations to mine. Some areas of Alaska, as an example, were about the same as my location even though they never get real warm weather because they dont get as cold either. My area is about the same as central NY too. The charts would be a good thing to look at if you are considering moving or looking to be a snow bird to find a location that has temps you want.

Other than comparing stuff, if its cold I just turn my stove up a little and I dont worry about all the figures.

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