[Equest-users] Internal manipulation of Weather data

[Paul Diglio]

Keith:

It is my understanding that TMY2 is based on data from 1961 through 1990.  TMY3 
data is based on the data from 1991-2005, not 30 years.

Do you have different information?

If Siddharth is comparing a model using TMY2 v. TMY3, there will be a noticeable 
difference.

Paul Diglio





________________________________
From: Keith Swartz <kswartz at ecw.org>
To: Siddharth V <siddharth.v at tcs.com>; "equest-users at lists.onebuilding.org" 
<equest-users at lists.onebuilding.org>
Sent: Tue, March 22, 2011 5:48:40 PM
Subject: Re: [Equest-users] Internal manipulation of Weather data


Siddharth,
 
Are you actually changing the weather file with data for those years, or are you 
changing the “analysis year” in the wizard? The TMY2 or TMY3 weather file uses 
data averaged from 30 years worth of data. Changing the analysis year will 
affect how weekends and holidays line up with the weather data for each day of 
the year.
 
________________________________
Keith Swartz, P.E., LEED AP

Energy Engineer / Senior Project Manager
EnergyCenterof Wisconsin
455 Science Drive, Suite 200, Madison, WI53711
Phone: 608.238.8276 x123
Fax: 608.238.0523

The Buildings Team
Design decisions through energy, economics and emissions analysis.
www.ecw.org/Buildings 

EnergyCenterUniversity
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/
From:Siddharth V [mailto:siddharth.v at tcs.com] 
Sent: Tuesday, March 22, 2011 5:42 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Internal manipulation of Weather data
 

Hi All, 

I have observed 3% difference in the energy consumption for a given location 
while specifying two different years (2010 and 2011). How does eQUEST (or any 
energy simulation s/w) internally extrapolates the weather data based on the 
specified year? 


I feel 3% difference in energy is very significant. Any guidelines on selection 
of TMY (typical meteorological year) ? 


Thanks in advance! 


Regards,
Siddharth Venkataraman
Tata Consultancy Services
Mailto: siddharth.v at tcs.com
Website: http://www.tcs.com
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