Re: [EnergyPlus_Support] Re: Changes to epw file

[sachin sharma <sachin_skit@xxxxxxxxx>]

Hey Linda,

Thanks a lot that was of great help. I followed the steps but there is one issue which I came across while going through the steps. The weather file has hourly report, however, in energyplus if we use the output variable of OA DBT we can get temperature of OA with timesteps of 15mins interval as well. So, how does energyplus calculate the OA DBT for that interval, as it is not mentioned in the weather file. Or does it work on some sought of algorithm.

regards,
SACHIN SHARMA



--- On Fri, 3/16/12, L Lawrie <linda@xxxxxxxxxxxxxx> wrote:

From: L Lawrie <linda@xxxxxxxxxxxxxx>
Subject: [EnergyPlus_Support] Re: Changes to epw file
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Friday, March 16, 2012, 4:07 AM

 

My suggested set of steps is similar to the other user:
How do I modify an EPW file?
The easiest way is:
1) run the EnergyPlus weather converter on the original file
2) convert the file to "EnergyPlus CSV"
3) open the EnergyPlus CSV file in your favorite spreadsheet program.
4) make the mods, saving it as CSV from the spreadsheet program.
5) run the weather converter again, this time selecting the CSV and make sure the File type is "EnergyPlus CSV"
6) convert it to EPW.

if your regional settings aren't like US, you could run into a couple of problems, such as the spreadsheet program changing the DataPeriods line from 1/1, 12/31 to 01-Jan -- you'd need to hand edit that before step 5

Be aware that specific year data is not usually deemed appropriate for Energy Analysis.
See this document for more details:
Information on selecting weather data is described in this paper:
Drury B. Crawley. 1998. "Which Weather Data Should You Use for Energy Simulations of Commercial Buildings?" in ASHRAE Transactions, pp. 498-515, Vol. 104, Pt. 2. Atlanta: ASHRAE. (PDF 197 KB)

PDF: http://energyplus.gov/pdfs/bibliography/whichweatherdatashouldyouuseforenergysimulations.pdf

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