[Equest-users] [Bldg-sim] How to mirror a building in eQUEST

Thu Apr 28 13:28:54 PDT 2016

This is just a thought:

If the building is mirrored about a north-south axis then the floor polygons can be mirrored by switching the x coordinates of the polygon vertices. Then the floor in each space has a polygon that is the mirror of the space polygon. You could use those polygons to replace the existing space polygons – I think. The tricky part is placing each of those polygons on the correct vertex of its new floor polygon. The exterior walls should still be on the same relative space vertex – I think.

[cid:image003.png at 01D09C46.E75BA0D0]
Christopher Jones, P.Eng.
Senior Engineer

WSP Canada Inc.
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4
T +1 416-644-4226
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www.wspgroup.com<http://www.wspgroup.com/>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Xiangjin Yang via Equest-users
Sent: Thursday, April 28, 2016 10:33 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] [Bldg-sim] How to mirror a building in eQUEST

Hello All,
Thanks for your help. Our energy modelling team got a heated discussion and come out two possible “easier” solutions:

1.     Rotate the building by 180 deg and change the Latitude from north to south – does not work, since the program does not take this revised Latitude in the simulation. The weather file needs to be modified to mirror the location of the building from northern hemisphere to south hemisphere. I will pull out the weather file to see how complicated it is.

2.     Edit azimuth values for all exposures in .inp files or in parametric run. The geometry is still the same, but the exposures have been changed.  But the problem is the azimuth values are relative to origin of each zone, not absolute. It will be a lot of work to flip the exposures 180 deg by checking what is the original azimuth values in the model. Say if the building is mirrored on an north-south axis, the north is still north, but east becomes west.  So the east and west exposures need to be edited, while the north and south exposures can be left untouched.

I am still on my way to solve it out completely. But these two approaches may give some hints to others who encounter the same situation. At the same time, you are always welcome to put your comments and suggestions.

Regards,

Xiangjin Yang Ph.D., P.Eng., LEED AP BD+C
MCW Energy Modelling Centre of Excellence
Building Simulation Engineer

MCW Consultants Ltd. <http://www.mcw.com>
Queen’s Quay Terminal
207 Queen’s Quay West, Suite 615
Toronto, Ontario, Canada M5J 1A7
Office: (416) 598-2920 ext:255
Fax: (416) 598-5394

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