DegreeDays provides degree day calculations, based upon temperature received at the Temp In slot and values of various other properties.
Definition of Degree Days: Degree Days is a unit of measure that may be expressed as either Heating Degree Days (HDD) or Cooling
Degree Days (CDD). You calculate Degree Days by taking the difference between the average temperature during a given time
period (month, season, year) and a reference point, usually 65 degrees Fahrenheit.
Both cooling and heating degree day values are available, including totalized values. A Reset Totals action is available to clear (zero) totalized values.
DegreeDays is available in the Energy folder of the kitControl palette. The following sections provide more details:
The DegreeDays component includes the following properties and one action:
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Facets
This is used to set the units and number precision of the Temp In, Min Temp, Max Temp, and Mean Temp properties.
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Base Temperature
Specifies the base temperature used in the degree-day calculation.
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Temp In
This is the input for the outside air temperature used in the degree-day calculation. Note: If this input is not valid the no calculations will be done.
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Min Temp
The minimum temperature recorded for the current day. Tested and set on each calculation.
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Max Temp
The maximum temperature recorded for the current day. Tested and set on each calculation.
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Mean Temp
The mean temperature recorded for the previous day. Calculated when the day changes. Mean Temp = (Max Temp + Min Temp) / 2.0
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Clg Deg Days
This is the cooling degree-day calculated for the previous day. Calculated when the day changes.
If (Mean Temp - Base Temperature) > 0 Clg Deg Days = Mean Temp - Base Temperatureelse Clg Deg Days = 0.0
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Clg Deg Days Total
This is the totalized cooling degree-days since last Reset Totals action was invoked. Calculated when Clg Deg Days changes.
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Htg Deg Days
This is the heating degree-day calculated for the previous day. Calculated when the day changes.
If (Mean Temp - Base Temperature) < 0 Htg Deg Days = Base Temperature - Mean Tempelse Htg Deg Days = 0.0
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Htg Deg Days Total
This is the totalized heating degree-days since last Reset Totals action was invoked. Calculated when Htg Deg Days changes.
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Reset Totals
This action will clear the Clg Deg Days Total and Htg Deg Days Total properties to zero when invoked.
Figure 18 shows an example DegreeDays property sheet.
