Heat/cold degree days and Chill hours: Difference between revisions

Heat/cold degree days and Chill hours (view source)

Revision as of 15:00, 18 December 2014

2 bytes removed , 15:00, 18 December 2014

→‎Calculation of Chill Hours

Steve

Bureaucrats

555

edits

@@ Line 17: / Line 17: @@
 This measure is sometimes called ''Growing Degree Days'', because it relates to plants or insects rather than heating systems, but that seems a strange labelling because growth in most plants and insects responds to warmth, although some seeds need a period of chilling to stimulate germination and as described below some fruit needs chilling to promote development.  However, [http://sandaysoft.com/forum/tracker.php?p=1&t=262| enhancement request #262] reports a different definition of ''Growing Degree Days'' based on summing daily: ((MaxTemp - MinTemp)/2 - BaseTemp) for all days where the value is positive (negative values are not subtracted).
 === Calculation of Chill Hours ===
-The traditional way of calculating the accumulation of Chill Hours is the number of hours the temperature is below 45 degrees Fahrenheit or 7.2 degrees Celsius for the period of 1st October to 30th April in the Northern Hemisphere. One applicability is to stone and seed fruit as their exposure to low temperatures during the winter months will have a significant effect on the following harvest. Too few cold hours can result in poor quality and quantity of the crop. Fruit tree varieties prefer a Chill Hour rating from about 200 hours to around 1500 hours.
+The traditional way of calculating the accumulation of Chill Hours is the number of hours the temperature is below 45 degrees Fahrenheit or 7 degrees Celsius for the period of 1st October to 30th April in the Northern Hemisphere. One applicability is to stone and seed fruit as their exposure to low temperatures during the winter months will have a significant effect on the following harvest. Too few cold hours can result in poor quality and quantity of the crop. Fruit tree varieties prefer a Chill Hour rating from about 200 hours to around 1500 hours.
 On Cumulus that threshold, and start date are the default, so you simply observe the reported value at the relevant time on 30 April/1 May. To use a different threshold add ''ChillHourThreshold=x.x''  to [[Cumulus.ini#Section:_Station| station section in Cumulus.ini]] where x.x is the temperature you want in your normal Cumulus temperature units. Use ''ChillHourSeasonStart=mm'' in  [[Cumulus.ini#Section:_Station| station section in Cumulus.ini]] where mm represents month number (1=January, 12=December) to change the season start.  The current figure is viewable on the 'This Year' screen accessed from the View menu (only when the current year is selected), stored in [[today.ini]], and is available via web tag <#chillhours> to be seasonal or longer period  added to a web page template of your design.  Should you miss checking the reported value on 1 May, then for a few days, you can look in the backup sub-folder for the necessary archived today.ini. In the current version of Cumulus, a new archive of the data sub-folder is taken just after each rollover, but note that Chill hours are counted in Cumulus by calendar day (therefore some interpolation is needed if your rollover is 9am/10am).