[Sbse] Climatic design in Arab world and the questions you posed
s.roaf at btinternet.com
Wed Apr 7 06:40:01 PDT 2021
Numbers of people in a building will change over its life - surely what
matters is the quality of the basic building = not the ephemeral things
about it like numbers of people or HVAC systems?
------ Original Message ------
From: "Nina Baird, PhD" <nbaird at cmu.edu>
To: s.roaf at btinternet.com; sbse at uidaho.edu
Cc: mdekay at utk.edu
Sent: Wednesday, 7 Apr, 21 At 14:33
Subject: Re: [Sbse] Climatic design in Arab world and the questions you
Sue --and other SBSE listserv readers--
I'd welcome a copy of your Closing the Loop: benchmarks for
Related to the questions you posed and, to some extent, to Mark's
original request, here are a couple of related questions:
How much does climate drive comfort within a building? One of my
students studying urban heat island in 100+ cities in India and the US
said that the most dense city in India has a population density 16x that
of New York City. And there's a comparison of FAR or FSI in Manhattan
that shows that even if floor area ratio may look similar or even higher
in Manhattan, the floor area per person is far greater in Mumbai. This
suggests that in Mumbai and other locations with high urban and floor
area density, design opportunities and strategies to support comfort
indoors are likely to be different than those in far less densely
If we set a building lifespan for operating energy measurement, how
might it influence or be related to lifespan designed to preserve
embodied energy and carbon? One of my students from Jakarta told me
that a 10-yr lifespan would not be unusual there since rapid growth
makes land values skyrocket so building owners/developers demolish
existing buildings to create something taller/with more floor area. He
said this in reaction to the 60-year lifespan assumed in a LEED credit
for lifecycle assessment. Maybe we should label the operating energy
evaluation period something other than "lifespan?" To follow the
global rating system thread I mentioned earlier, there are some rating
systems that attempt to preserve embodied energy where development is
rapid, e.g., Abu Dhabi's Pearl rating system provides a credit that
encourages a structure that would allow more stories to be added and
dimensional characteristics that would allow the building to be adapted
to new uses, and another credit that encourages design for disassembly.
Hong Kong's Beam Plus contains similar ideas. Recently and for
different reasons, the NYTimes recently promoted similar considerations
. I think both strategies--evaluating the persistence of effective
operating energy performance and promoting preservation of embodied
energy/carbon--are important for overall sustainable design.
Hope to see others' ideas.
Date: Tue, 6 Apr 2021 12:25:40 +0100 (BST)
From: Susan Roaf <s.roaf at btinternet.com <mailto:s.roaf at btinternet.com>
To: "Nina Baird, PhD" <nbaird at cmu.edu <mailto:nbaird at cmu.edu> >,
mdekay at utk.edu <mailto:mdekay at utk.edu> ,
sbse at uidaho.edu <mailto:sbse at uidaho.edu>
Subject: Re: [Sbse] Climatic design in Arab world
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Excellent trail here. It begs the question of what is / are:
a) a thermally good building - the thermal performance is related to
amount of energy it needs to keep people acceptably comfortable
b) the limits being set in each rating system for thermally
c) An acceptable lifespan for a building? If you are measuring the
energy performance over time - can we agree a time over which it
be measured so we can compare outputs.
d) Can we include a factor in such rating systems for the 'Pandemic
Preparedness' of a buildings - and how might one measure that? - is we
are really trying to define the vulnerability of structures to
environmental change - their 'sustainability' - or durability - as
investments for owners and users?
If anyone wants a pdf of my Closing the Loop: benchmarks for
Buildings - email me - I maintain there that one cannot compare apples
and pears in a black box system in which the assumptions of the box
creator are not clear. One might end up with solutions that push
sustainable alternatives for instance - Heaven Forbid.
I would welcome any insights into the above questions..... genuinely
interested in the answers from SBSE - as aye...
Nina J. Baird, PhD, MSPH
Academic Chair, CMU Green Practices
Center for Building Performance & Diagnostics
Carnegie Mellon University
5000 Forbes Ave, MMCH 415
Pittsburgh, PA 15213
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