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Old 03-26-13, 01:28 AM   #1432
AC_Hacker
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Default Design Temperature

Quote:
Originally Posted by cbearden View Post
I went back and put in an avg temp that we've seen in this area this year. And that definitely changes the heat load calc page.
So, you should be able to find:
  • High Temp data
  • Average Temp data
  • Low Temp data

and also:
  • Average High Temp data
  • Average Low Temp data

If it were me, I'd design for the average low temp data.

But an even better bet would be to use what is known as Design Temperature. That would mean the statistically average low temp that one would expect in a typical winter in your location. This would not be the lowest temperature on record. It would also not be the lowest 3% of the coldest days. It would be a bit warmer than that, so 97% of the winter days would be warmer than the Design Temperature. If you do a little research for your area, you can find this temperature.

For Portland, my fair city, the Design Temperature is 17 degrees F.

Best,

-AC
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