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Heat/cold degree days and Chill hours: Difference between revisions
Heat/cold degree days and Chill hours (view source)
Revision as of 11:20, 3 January 2013
, 11:20, 3 January 2013→Heat Degree Days: sentance added re matching thresholds
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==Heat Degree Days== | ==Heat Degree Days== | ||
You may have a thermostat that makes your heating come on when the temperature falls below a threshold. | You may have a thermostat that makes your heating come on when the temperature falls below a threshold. | ||
Cumulus calculates an integration of the number of degrees below | Cumulus calculates an integration of the number of degrees below a threshold you select over the time that the temperature is below that threshold. | ||
Cumulus reports this by month as part of the National Oceanic and Atmospheric Administration (NOAA) style report, in the annual NOAA report, in dayfile.txt, and via heating degree days web tag. (NOAA is an Operating Unit of the U.S. Department of Commerce). | Cumulus reports this by month as part of the National Oceanic and Atmospheric Administration (NOAA) style report, in the annual NOAA report, in dayfile.txt, and via heating degree days web tag. (NOAA is an Operating Unit of the U.S. Department of Commerce). | ||
If the threshold you select in Cumulus matches your thermostat, the reported value gives you a measure for how hard your heating system has worked; otherwise it is a statistic that gives you a feel for how cold it has been. | |||
So if for the whole of November, there was just one hour at one degree below the threshold, two hours at five degrees below, and three hours at seven degrees below; the total for the month would be (1*1)+(2*5) +(3*7) hours reported as 32 degree days. | So if for the whole of November, there was just one hour at one degree below the threshold, two hours at five degrees below, and three hours at seven degrees below; the total for the month would be (1*1)+(2*5) +(3*7) hours reported as 32 degree days. | ||
==Chill Hours== | ==Chill Hours== | ||
A related measure, also reported by Cumulus counting the ''hours'' below a (different) configurable temperature threshold for the 12 month period starting on the 1st day of a configurable month, is Chill Hours. | A related measure, also reported by Cumulus counting the ''hours'' below a (different) configurable temperature threshold for the 12 month period starting on the 1st day of a configurable month, is Chill Hours. | ||