[Equest-users] Baseline Rotations as per ASHRAE 90.1

[Nick Caton]

Small rotational differences are typical of buildings with similar
surface areas on the east, west, north, and south elevations.  I would
only expect a significant difference if you have a very "long"
footprint, or one side of your building is largely unconditioned along
the perimeter.  Conceptually, I suppose we're being "rewarded" for
choosing an optimal orientation rotation on the building site - but if
anything we're really being rewarded for designing "long" building
footprints as they can have a larger difference against the averaged
baseline...

 

That said, if an architect asks me at a conceptual design stage, the
most thermally efficient building shape considering exterior surface
area is theoretically a hemisphere - barring that a "cubic," compact 3D
shape is better than any "long" shape with larger surface area for the
given volume/footprint.  If the goal is to maximize LEED points
(relative baseline performance), you might suggest a thermally
inefficient, but optimally-oriented "long" shape that will do better
than it's averaged baseline... (I wouldn't!)  If the goal is to reduce
energy consumption/utilities however for the end-users, reduce the
building shape surface area.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Soham
Babu
Sent: Friday, July 02, 2010 2:29 AM
To: Omar Katanani; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Baseline Rotations as per ASHRAE 90.1

 

Omar,

 

 Simulation for 4 rotations value will be small difference only, in some
of the cases it will be same also. it all depends upon the building
location & orientation.

 

Regards

Soham

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Omar
Katanani
Sent: Friday, July 02, 2010 12:48 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Baseline Rotations as per ASHRAE 90.1

 

Dear all,

 

I performed a simulation of my baseline building over the 4 rotations.
The difference between the lowest consumption and the highest one out of
the 4 runs was only 1.33% (1,312,500 to 1,329,200 kWh).

 

Is this a normal value? This is my first project but I thought I would
have a bigger number.

 

Any advice out of your experience is greatly appreciated.

 

Many thanks,

Omar

___________________________

Omar Katanani
Sustainable Design Engineer

Email: omar at ecoconsulting.net

 

EcoConsulting (Lebanon)

Nahas Building, 4th floor

4 St-Maron Street / Georges Haddad Avenue

Postal Code: 2028 5806 SAIFI

Beirut, Lebanon

Tel:          +961 (0) 1 971 255
Mobile:    +961 (0) 3 045 045

 

EcoConsulting (UK) Ltd
28 Marshalsea Road
London, SE1 1HF
Tel:  +44 (0) 207 939 0989
Fax:  +44 (0) 207 939 0981

Website: www.ecoconsulting.net <http://www.ecoconsulting.net/> 

 

  

 

 

 

 

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