This is not done for randomization,
it's done to create a "typical year" where each month has been
selected as the closest representation of the long-term
distribution of climate variables. The exact procedure used in
this selection process varies depending on who did the work. For
files produced in the US, e.g. NREL's TMYx, ASHRAE's IWECx, etc.,
the selection is based on daily temperatures and humidities (max,
average, and min), solar radiation (average), and wind speed
(average),
with varying weights applied to each. Note that wind direction is not considered.
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx
http://weather.whiteboxtechnologies.com for simulation-ready weather data
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 12/28/2013 2:22 AM, issworld2000@xxxxxxxxx wrote:
with varying weights applied to each. Note that wind direction is not considered.
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx
http://weather.whiteboxtechnologies.com for simulation-ready weather data
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 12/28/2013 2:22 AM, issworld2000@xxxxxxxxx wrote:
Thank you for the reply once again. I managed to find the required wind speed and direction data (per hour) in .epw file. You were right, sorry.
What makes me puzzled is that for each month a data from a different year is picked up. Does this randomization of years makes data more accurate?
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