[Bldg-sim] Impact of Overhangs

[mark dewsbury]

Dear Maria,

 

The test cells in Launceston and the test houses in Hobart were operating in
free running mode.  

 

Mark Dewsbury

Centre for Sustainable Architecture with Wood
School of Architecture
University of Tasmania
Locked Bag 1324
Launceston 7250
ph: 03 6324 4089
mob: 0417 290 807
fax: 03 6324 4088
e: mark.dewsbury at utas.edu.au

  _____  

From: Maria Kordjamshidi [mailto:m_kordjamshidi at yahoo.com] 
Sent: Sunday, 7 February 2010 11:03 PM
To: BldgSim Mailing List; equest-users at lists.onebuilding.org;
trace-users at lists.onebuilding.org; Fareed Syed; John Aulbach
Subject: Re: [Bldg-sim] Impact of Overhangs

 


John

 

Free running: refers to the state of a building that is naturally ventilated
and does not use any mechanical equipment to maintain or improve its indoor
thermal condition.

 

Maria



--- On Sat, 2/6/10, John Aulbach <jra_sac at yahoo.com> wrote:


From: John Aulbach <jra_sac at yahoo.com>
Subject: Re: [Bldg-sim] Impact of Overhangs
To: "Maria Kordjamshidi" <m_kordjamshidi at yahoo.com>, "BldgSim Mailing List"
<bldg-sim at onebuilding.org>, equest-users at lists.onebuilding.org,
trace-users at lists.onebuilding.org, "Fareed Syed" <syedf at progressiveae.com>
Date: Saturday, February 6, 2010, 8:29 PM

Maria:

 

Excellent information.

 

Would you please describe what you mean by "free running mode"?

 

Thank you.

 


  _____  


From: Maria Kordjamshidi <m_kordjamshidi at yahoo.com>
To: BldgSim Mailing List <bldg-sim at onebuilding.org>;
equest-users at lists.onebuilding.org; trace-users at lists.onebuilding.org;
Fareed Syed <syedf at progressiveae.com>
Sent: Fri, February 5, 2010 9:47:04 PM
Subject: Re: [Bldg-sim] Impact of Overhangs


Fareed

 

I have examined the effect of many parameters on the thermal performance of
6 typical houses (single storey and double storey houses) for a moderate
climate of Sydney. a part of my report comes in the following for your
consideration.

 

"Adding an overhang above all windows improved annual thermal performance of
the typical houses in conditioned mode. However, this was not the case for
the houses in free running mode. The houses presented different patterns of
annual thermal performance in the different modes, responding to increments
in overhang width.

Increases in overhang width of 1m resulted in an average of 4.8% enhancement
in the house's annual thermal performance in conditioned mode. The same
overhang generally caused 3.7% deterioration in annual free running
performance, while a slight improvement was observed in thermal performance
in some cases.  The reason for these different results is made clear when
comparing the seasonal performances of each house in two different house
modes. 

When all the overhang widths were increased to 1m, the summer performance
improved by an average of 26.6% in conditioned mode. The improvement
decreased to an average of 8% for all houses in free running mode. The
winter performance of the typical houses in this situation deteriorated by
an average of 8.2% in conditioned mode and 11.7% in the free running mode.
Thus the deterioration that was observed in the annual free running
performance of some of the houses in response to the setting of overhang
with a width of 1m for all windows would appear to owe more to deterioration
in their winter performance and less improvement in their summer performance
in free running mode than in conditioned mode." 

  

 

Hope this help

 

Maria

 



--- On Sat, 2/6/10, Fareed Syed <syedf at progressiveae.com> wrote:


From: Fareed Syed <syedf at progressiveae.com>
Subject: [Bldg-sim] Impact of Overhangs
To: "BldgSim Mailing List" <bldg-sim at onebuilding.org>,
equest-users at lists.onebuilding.org, trace-users at lists.onebuilding.org
Date: Saturday, February 6, 2010, 12:22 AM

Folks,

 

Does anyone have good research data using simulations on the impact of
overhangs and shadings for a typical building? 

  

I am having hard time convincing architects to reduce the glazing. They will
make it a glass building if they are given a chance. 

  

I want to show them that for a 2 or 3 storied building with ton of glazing
and few feet of overhang will not help the cooling/heating loads at all. 

  

I would appreciate your input. 

  

Thanks much. 

  

  

Fareed Syed EIT, LEEDR AP 

Mechanical Engineer 
cid:image001.png at 01C9B834.C9D7E7F0

1811 4 Mile Rd NE
Grand Rapids, MI  49525 

  

Phone: 616.361.2664 ext. 3247
Direct: 616.447.3447
Fax: 616.361.1493 

 <http://us.mc514.mail.yahoo.com/mc/compose?to=syedf@progressiveae.com>
syedf at progressiveae.com
 <http://www.progressiveae.com/> www.progressiveae.com


  

 
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