Malindo,
If you're seeing these wierd discontinuities in the weather data, then there's probably a bug in the interpolation procedure. Interpolation weather data from hourly to subhourly data is very straightforward, especially for temperature - you can just do a linear interpolation between the hourly records. For some other variables, like wind direction, you would want to just repeat the same record until the next one. For solar, there might be some issues since the reported value is the total for the hour, but if you subdivide that to a minute value and then interpolate, it should be fine.
If you're comparing the results to measured data, you must use the weather data for the same time period. I've generated a lot of weather data for the world for ASHRAE and others, and I know there's very good reported weather data for Singapore. If you tell me the actual time period that you're interested, I can create that weather file, as well as interpolate the data down to the hourly record for no charge, just to see if that solves your problem.
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
Joe Huang White Box Technologies, Inc. 346 Rheem Blvd., Suite 108D Moraga CA 94556 yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx www.whiteboxtechnologies.com (o) (925)388-0265 (c) (510)928-2683 "building energy simulations at your fingertips"
On 4/1/2012 2:13 AM, malindow wrote:
Dear all,
I run a simulation (using timestep = 60) and found that there is abrupt change in temperature for every new hour e.g. temp at 16:00:00 is 36.8 deg and temp at 16:01:00 is 26.1 deg. This is weird since it never abruptly change along the hour itself (temp in minute 1 to 60 changes gradually).
I suspect it is because of the weather file is made in hourly interval. Does anyone know how can I edit my weather file to represent sub-hourly interval simulation?
Your answer is really appreciated.
Malindo
Final year student
Singapore
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