[Equest-users] Ground temperatures

[Kapil Upadhyaya]

Simge,
Do keep in mind that in DOE2 these are fixed monthly averages used for all hours of the month; these are derived by the ground reaching monthly-average outside air temperature at a lag of 3 months.

Ground Temperature will have little effect on loads/energy in Houston for typical buildings. If you are simulating geothermal heat exchange or radiant heating (thru slab-on-grade),  then the investigation will be time worth spent.

Best,

Kapil Upadhyaya, LEED AP
Associate
Kirksey | Architecture
6909 Portwest Drive  |  Houston Texas 77024  |  www.kirksey.com<http://www.kirksey.com>
o  713 426 7508  |  f  713 850 7308  |  kapilu at kirksey.com<mailto:kapilu at kirksey.com>
2012-2013 Firm of the Year
Texas Society of Architects

From: Nick Caton [mailto:ncaton at smithboucher.com]
Sent: Thursday, October 24, 2013 2:55 PM
To: Joe Huang; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Ground temperatures

I haven't tried Joe's suggested tool (yet), but here's the hourly report variable you're looking for:
[cid:image001.png at 01CED0E7.752EFEC0]
(Rankine conversion reference)<http://en.wikipedia.org/wiki/Rankine_scale>

You get here double clicking one of the hourly report items in the component tree under the "project and site" tab.  You can view the results by running the simulation then either opening the resulting .csv in the project directory or clicking the "hourly results" button on the top right of the "detailed results viewer," which opens the same file.  Within that file scroll to the far right to check out any custom report variables you've included for the project.

Such an hourly report builds upon Joe's observation - it appears the monthly ground temperatures are averaged into 12 values over the year, then applied to each month on an hourly basis for the simulation.  I can't speak to whether this is a trait specific to eQuest and/or the DOE-2 engine.

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Thursday, October 24, 2013 2:18 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Ground temperatures

Correction to previous e-mail, meant to say

"By the way, I think that DOE-2 should do some smoothing or interpolation of the monthly ground temperatures; right now if you look at ..."

Joe

Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

http://weather.whiteboxtechnologies.com for simulation-ready weather data

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 10/24/2013 12:15 PM, Joe Huang wrote:
In my opinion, the easiest way to get the ground temperatures would not be through DOE-2 Hourly Reports, although I'm sure that can be done, but by reading them from the weather file using the WTHFMT2 utility program that converts the file from binary to text.  There are just 12 numbers for monthly ground temperatures, shown on line 2 of the *.FMT files.  By the way, I think that DOE-2 does some smoothing or interpolation of the monthly ground temperatures; right now if you look at the hourly heat transfer through Underground walls or floors, you'll see a wierd staircase effect with the same load for a whole month, and then a jump to a different load the next month, etc.

Joe

Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

http://weather.whiteboxtechnologies.com for simulation-ready weather data

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 10/24/2013 11:05 AM, Simge Andolsun wrote:
Dear eQuest Users,

Would you please let me know which report would give me the deep ground temperatures used in ground heat transfer calculations of eQuest? I used to select an hourly report variable to make DOE-2.1e report these values, but I am not sure how to get these values from eQuest. Would you help me with this?

Thank you very much in advance for your help,
Best Regards,

Simge Andolsun, PhD.



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