Hi All,
I'm trying to see how the building consumption changes in response to
climate change. For this scenario I have calibrated an existing residential
building (located in Dubai) to the actual electricity consumption.
This is my fist time handling a project with response to climate change.
This was my approach to see how temp. affects the building consumption.
1.Get the regression model using typical Dubai weather. Get the equation
based on cooling degree days and vary the CDD by 1% and 2% to get the new
Kwh consumption. With that building consumption has increased by 2 to 5 %.
2. Get the equation with RH and vary by 5% or 10% averages.(Still yet to do)
Meanwhile, I was thinking to increase WB temp. by 2 Deg Celsius. For this have
to change 8760 numbers of data in the excel weather file, and then must be
converted back to .bin format to run the simulation.
I would appreciate if someone could share any thoughts on how to tackle
this. Has anyone done energy modeling projects varying temperatures and
humidity?
Thank you
Rehana.
A short answer to your question may be to play with the ELEMENTS program available from bigladder software?s website
This program can easily read/write from EPW/BIN/FMT formats. It also has some built in weather normalization functions as well (monthly or annually you can push up the mean DB/WB, independently or together).
If I were tackling this project from scratch & wanted more control over the weather file manipulation, I might try playing with the doe2 weather file text format (FMT).
If you open and save in this format using ELEMENT, it?ll hopefully look something like this:
The highlighted column is wet bulb temperatures. The following column is drybulb temperatures. I haven?t dabbled much here, but it looks like this would be relatively easy to manipulate if you have something already set up in the way of your own normalization process. ELEMENTS could then open this (modified) FMT and generate a new BIN.
~Nick
------------------------------------------------------------------------------------------------------------------------------
Nick Caton, P.E.
Senior Energy Engineer
Energy and Sustainability Services
North America Operations
Schneider Electric
D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States
Hi Rehana,
I think cooling degree days are the sum of number of degrees above which
the outside air temperature is above the base temperature.
Hence if one is increasing the number of cooling degree days by any means
then either you are lowering the base temperature or either increasing the
OAT above base temperature.
In both the cases if your number of cooling hours and degrees are
increasing then only may be the cooling consumption can go higher.
If one increases the RH then the cooling consumption may go higher
depending upon the weather file as per my previous experiences as the
latent cooling is required to be more for more relative humidity in the
weather file.
If you increase the wet bulb temperature then from psychometric chart for a
given DBT the relative humidity for that referred temperature may go higher
and then based on enthalpy lines and based formulas one can derive whether
the latent cooling or heating will require more energy or not.
Additionally i want to learn from you that how excel weather file can be
converted into .bin file.Is it the stat file.I mean if you are doing in
IES-VE then i have for gotten that means.May be one can have a do with the
excel file and somehow. So kindly suggest me the weather file format
conversion as i did a similar project some two years back but still to
learn and do. I have heard of it before somewhere also but can't recall.
Thanks,
Sharad.Kumar|Engineer
Green Horizon Consulting LLP
Gurgaon
India
---------- Forwarded message ----------
From: Rehana Jiffrey via Equest-users
To: equest-users at lists.onebuilding.org
Cc:
Date: Mon, 9 May 2016 16:52:58 +0400
Subject: [Equest-users] How building consumption varies with 1 and 2 Degree
analysis with 2 variable humidity difference?
Hi All,
I'm trying to see how the building consumption changes in response to
climate change. For this scenario I have calibrated an existing residential
building (located in Dubai) to the actual electricity consumption.
This is my fist time handling a project with response to climate change.
This was my approach to see how temp. affects the building consumption.
1.Get the regression model using typical Dubai weather. Get the equation
based on cooling degree days and vary the CDD by 1% and 2% to get the new
Kwh consumption. With that building consumption has increased by 2 to 5 %.
2. Get the equation with RH and vary by 5% or 10% averages.(Still yet to do)
Meanwhile, I was thinking to increase WB temp. by 2 Deg Celsius. For this have
to change 8760 numbers of data in the excel weather file, and then must be
converted back to .bin format to run the simulation.
I would appreciate if someone could share any thoughts on how to tackle
this. Has anyone done energy modeling projects varying temperatures and
humidity?
Thank you
Rehana.