[Hap-users] U-Value for Concrete Wall with Green Wall

[Aaron Smith via Hap-users]

Hi Daniel,

It appears as though the green wall is simply shading the concrete wall
rather than reducing the U-value.  Another option besides what was presented
below is to lower the wall absorptivity to account for less solar heat
reaching the wall of your building.  I think that is in fact what will be
happening.

I came across this report in my brief google search which may be of help.

http://www.greenroofs.org/resources/UMDGreenWallResearch(FinalReport).pdf

Regards,
Aaron
   

Aaron Smith, P.Eng
M&R Engineering Ltd.

-----Original Message-----
Date: Tue, 1 Nov 2016 10:52:29 +0000
From: "Matthew J. Baron via Hap-users"
	<hap-users at lists.onebuilding.org>
To: Daniel Lim <dannyllim at yahoo.com>
Cc: "hap-users at lists.onebuilding.org"
	<hap-users at lists.onebuilding.org>
Subject: Re: [Hap-users] U-Value for Concrete Wall with Green Wall
Message-ID: <f7f3e31001cb42629b4002cce995316b at WV-EXCH2013.WD-AE.COM>
Content-Type: text/plain; charset="utf-8"

Just a thought, depending on what hemisphere you?re in (I?m assuming
northern) you could put all the walls on the northern exposure so they
receive no direct sunlight then add walls that are the exact size of your
windows (with the windows obviously) in the correct cardinal direction to
account for solar loading. This way you do not have to try and make a
correction to the u value and will get a fairly accurate space load.

Thank You,
Matthew J. Baron, PE

[cid:image001.jpg at 01D2340C.825B5040]


Wendel, Centerpointe Corporate Park, 375 Essjay Road, Suite 200,
Williamsville, NY 14221
p. 716.688.0766   tf. 877.293.6335   e.
mbaron at wendelcompanies.com<mailto:mbaron at wendelcompanies.com>   w.
wendelcompanies.com<http://www.wendelcompanies.com/>


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From: Hap-users [mailto:hap-users-bounces at lists.onebuilding.org] On Behalf
Of Daniel Lim via Hap-users
Sent: Monday, October 31, 2016 1:40 PM
To: hap-users at lists.onebuilding.org
Subject: [Hap-users] U-Value for Concrete Wall with Green Wall

I am modeling a 5-story retail building with punched windows and pre-cast
concrete walls. The walls are covered with green wall at a distance of 0.7
meters from the concrete wall. The windows are not covered. Since the
concrete walls are now covered from direct sun, I need to make adjustments
to the U-value of the walls to account for the shading. The exterior
shadings in HAP is not applicable for this case since they apply only to
windows as fins or canopy. The roof also has vegetated landscape which
should also be accounted for in getting the U-value of the roof. Any advice
or guidance on how to approach this in HAP is highly appreciated. Thanks in
advance.



Daniel Lim

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