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Re: [EnergyPlus_Support] diffuse solar
solar data is interpolated to the half/hour. i will
write that up for that section for the next release.
It may already be written up somewhere else in the documentation.
There are 87 instances of the word interpolation in 4 documents.
At 08:47 AM 2/1/2010, Hu,Jia wrote:
This rule is true for some variables, such as dry bulb temperature. For
timestep frequencey report, the "hourly value" reported
matches with hourly value in weather file. and the timestep value is the
interpolation of the hourly value using that formula.
But for some other outside variables, such as diffuse solar, it does not
follow this formula. In timestep frequency report, the "half-hour
value" (e.g. 8:30; 9:30) reported matches with hourly value in
On Mon, Feb 1, 2010 at 10:27 AM, Linda Lawrie
- Read about weather data interpolation in the IORef.
- Page 1947 (PDF page 94)
- At 06:06 PM 1/31/2010, Hu,Jia wrote:
- In EnergyPlus, when timestep = 4, the diffuse solar in weather file
is different from the output at the same hour. For example, in weather
file, at 9:00, the diffuse solar is 58, while in the output, 58 appears
at 8:30. This rule seems different from interpolation mentioned in help
- In calculating Daylight Factor, EP ref. mentions it uses hourly DF
and then interpolate the two hour DF to calculate the DF at time
step in one hour. So when calculating Daylight Factor, the
Energyplus adopts which hour values of Diffuse and direct Radiation in
the Outputfile? Does EP use 58 (at 8:30 in the output), or use
value at 8:00 in output (average values at 7:30 and 8:30, which are
corresponding to 8: 00 and 9:00 in the weather file respectively) ?
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