[Bldg-sim] Bldg-sim Digest, Vol 62, Issue 11
Jason Quinn
jason.e.quinn at gmail.com
Tue Jan 15 13:22:24 PST 2013
I've modeled that film for an office building in wellington, nz. I was
pretty excited but unable to show overall building energy reduction sure to
the film. Need to run a one zone model and see if I can obtain savings in
particular conditions.
That said a 40% better u value is wild. If be excited about 5% over the
year.
Jason
On Jan 16, 2013 10:01 AM, <bldg-sim-request at lists.onebuilding.org> wrote:
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Today's Topics:
1. HELP WANTED Senior and Intermediate Building Analysts
(Vancouver, BC) (Cobalt Resumes)
2. Re: Internal mass modeling guidance in E+? (Doug Hittle)
3. Re: Internal mass modeling guidance in E+? (Justin Spencer)
4. HELP WANTED: Lawrence Berkeley National Laboratory (Philip Haves)
5. Re: Internal mass modeling guidance in E+? (Joe Huang)
6. Re: Internal mass modeling guidance in E+? (Chris Yates)
7. Technical Staff position at Atelier Ten, San Francisco
(Shruti Kasarekar)
8. Window Film Product Claims (John Aulbach)
---------- Forwarded message ----------
From: Cobalt Resumes <resumes at integral-group.ca>
To: "bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Cc:
Date: Tue, 15 Jan 2013 00:13:19 +0000
Subject: [Bldg-sim] HELP WANTED Senior and Intermediate Building Analysts
(Vancouver, BC)
*Senior and Intermediate Building Analysts (Vancouver, BC)*
*THE COMPANY*
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believe that net zero energy buildings and living buildings need to become
the norm within a generation. We see ourselves as agents of change…
catalysts.****
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recently entered the collective consciousness of North America, since
inception, our firm has attracted talented engineers from around the world.
Engineers whose experience and training put them at the forefront of
sustainable design practices and technologies. For us, sustainability is
second nature and our design approach continues to be a reflection of our
commitment to creating a better future for generations to come.****
*Trust. Nurture. Inspire.* As a relationship based people-centric firm, we
are focused on making a difference in the world with the people we interact
with. We have contributed to an extensive list of high-profile projects
around the world, and were ranked as one of Canada’s Top 50 Workplaces in
2007, 2009 & 2011. ****
*THE POSITIONS*
The *Senior Building Analyst* will be a degree-qualified Mechanical
Engineer with experience and full competency in building mechanical
systems, building physics, thermodynamics and advanced building energy
analysis. He/she will be a team player with the ability to receive and
execute instructions from the Team Leader or Project Manager and be
responsible and accountable for completing the assigned projects on
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The *Intermediate Building Analyst* will be a degree-qualified Mechanical
Engineer with experience and adequate working proficiency in building
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independently with minimal guidance from the Team Leader or Project Manager*
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* *
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For further information, or to submit your application, please refer to our
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---------- Forwarded message ----------
From: Doug Hittle <hittle.doug at gmail.com>
To: Qinpeng Wang <qpwang at gatech.edu>
Cc: bldg-sim at lists.onebuilding.org
Date: Mon, 14 Jan 2013 19:58:03 -0700
Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?
I believe that E+ and predecessors take/took what ever was described
as "internal mass" and parsed it into an equivalent "partition" of
some "equivalent" area. This can lead to some counter intuitive
results. Most might expect that "internal" or "thermal" mass is going
to moderate energy transfer ("store"). But suppose I describe a
banquet hall full of folding mdf or plywood tables (light weight).
Compared to an empty room, the area available to absorb radiation and
convect it to the room is increased by easily 1/3. All of a sudden the
room is "fast" and energy gains are translated into cooling loads much
more quickly.
So let's agree with Joe that your question can be answered by "walking
around." In looking around my office I find that one partition is
covered with book cases and that the other side of the partition is
also covered with books. If I thought this was an important feature
that needed to be modeled (which I don't and which isn't) I would not
describe any internal equivalent mass, I would simply describe a
partition made up of books-air space-gyp board wall-air space-books.
But why do I think this is irrelevant additional work? I can weigh
some books to determine their density. We think books are heavy but
imagine putting an equivalent volume of concrete in your backpack.
Then they are not so "thermally massey". Also the books never receive
direct sunlight and the temperature in my office varies little because
it is in my heavily insulated, air tight home. Since the guzinta
equals the guzouta over time and since the guzinta and guzouta, even
for this massive double book lined partition, are near zero because
the materials are at constant temperature, more or less, the mass of
the books is not very important to the room energy balance.
I don't know what thermal mass is anyway. The term must have evolved
partly from passive solar designs, where energy storing materials
exposed to the sun are important, and from the brick trade
association who left a confusing legacy of claims that a masonry house
had a higher R-value because of the "thermal mass." Mind you I think
bricks are great, I have some myself. However, there is nothing in the
definition of R-value that is labeled "brick."
My apologies Dr. Wang. I expect that what I have just said is more or
less useless as an answer to you questions. However, a productive
guide to a first approach might be found in:
Consider a Spherical Cow: A Course in Environmental Problem Solving, John
Harte
It is easier to bound a problem than to defend anybody's guess at the
mean. The correct answer always seems to be "It Depends."
Doug Hittle
On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <qpwang at gatech.edu> wrote:
>
> Dear colleagues,
>
> I'm looking into furniture/internal mass modeling in energy models
particularly within the environment of EnergyPlus but also not limited to
that.
>
> I have two questions I guess:
>
> 1, Are there any modeling guide or reference building report that may
give recommendations/instructions on how to represent furniture/internal
mass inside a building if there is no much detailed information? I guess
all I'm asking is are there any published data-set, or default values in
terms of material property and area to represent furniture like what could
be easily found about schedules and occupancy density?
>
> COMNET modeling guide has only one paragraph about it and it mentioned
"The interior thermal mass and modeling assumptions in the baseline
building shall be the same as the proposed design."
> Currently what I have is from Building America House Simulation
Protocols: "The internal mass of furniture and contents shall be equal to 8
lb/ft2 of conditioned floor space. For solar distribution purposes,
lightweight furniture covering 40% of the floor area shall be assumed."
>
> 2, DOE reference commercial buildings have internal mass objects in the
idf. file, where does the information come from?
>
> Appreciate your input!
>
> Best,
>
> Qinpeng
>
> --
>
> Qinpeng Wang, PhD Student
>
> College of Architecture
>
> Georgia Institute of Technology
>
> Atlanta, GA 30332-0155
>
>
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>
---------- Forwarded message ----------
From: Justin Spencer <jspencer17 at gmail.com>
To: Doug Hittle <hittle.doug at gmail.com>
Cc: bldg-sim at lists.onebuilding.org, Qinpeng Wang <qpwang at gatech.edu>
Date: Mon, 14 Jan 2013 20:30:06 -0700
Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?
There's also an issue here about whether or not there's any modeling of
internal partitions or fixtures included in your model. My personal
experience in modeling residential models is that they always lag more than
you expect, so I've regularly responded by jacking up the internal mass. I
certainly can fit metered HVAC data a lot better when I add mass beyond
what the BABM suggests. I've guessed that's because my partitions don't
quite match the amount of mass we're interacting with.
I get what Doug is saying that there isn't much temperature change
occurring in his bookshelf, but when you have literally several tons of
exposed mass, even a degree or two of temperature change is quite a bit of
heat. Those granite counters currently in fashion do something for the
building mass.
What's funny about this is that the conventional rule of thumb is that
residential construction is "light" and has little impact from mass, while
commercial buildings are "heavy" and have lots of mass impacts. My personal
experience in studying this is that mass is extremely important in
residential construction because they "float" a lot of the time and also
have higher solar gains than commercial spaces.
One possible area of fruitful research I've thought about is to try and get
some utility direct load control data and look at the "response time" of
residences in terms of how long it took to have the temperature rise a
certain amount when the HVAC system was constrained. You'd at least get
some good data about how responsive the houses are supposed to be and alter
what you can in your models to get them to better match real life (whether
or not you actually figured out the root cause of the problem in the
model).
On Mon, Jan 14, 2013 at 7:58 PM, Doug Hittle <hittle.doug at gmail.com> wrote:
> I believe that E+ and predecessors take/took what ever was described
> as "internal mass" and parsed it into an equivalent "partition" of
> some "equivalent" area. This can lead to some counter intuitive
> results. Most might expect that "internal" or "thermal" mass is going
> to moderate energy transfer ("store"). But suppose I describe a
> banquet hall full of folding mdf or plywood tables (light weight).
> Compared to an empty room, the area available to absorb radiation and
> convect it to the room is increased by easily 1/3. All of a sudden the
> room is "fast" and energy gains are translated into cooling loads much
> more quickly.
>
> So let's agree with Joe that your question can be answered by "walking
> around." In looking around my office I find that one partition is
> covered with book cases and that the other side of the partition is
> also covered with books. If I thought this was an important feature
> that needed to be modeled (which I don't and which isn't) I would not
> describe any internal equivalent mass, I would simply describe a
> partition made up of books-air space-gyp board wall-air space-books.
>
> But why do I think this is irrelevant additional work? I can weigh
> some books to determine their density. We think books are heavy but
> imagine putting an equivalent volume of concrete in your backpack.
> Then they are not so "thermally massey". Also the books never receive
> direct sunlight and the temperature in my office varies little because
> it is in my heavily insulated, air tight home. Since the guzinta
> equals the guzouta over time and since the guzinta and guzouta, even
> for this massive double book lined partition, are near zero because
> the materials are at constant temperature, more or less, the mass of
> the books is not very important to the room energy balance.
>
> I don't know what thermal mass is anyway. The term must have evolved
> partly from passive solar designs, where energy storing materials
> exposed to the sun are important, and from the brick trade
> association who left a confusing legacy of claims that a masonry house
> had a higher R-value because of the "thermal mass." Mind you I think
> bricks are great, I have some myself. However, there is nothing in the
> definition of R-value that is labeled "brick."
>
> My apologies Dr. Wang. I expect that what I have just said is more or
> less useless as an answer to you questions. However, a productive
> guide to a first approach might be found in:
>
> Consider a Spherical Cow: A Course in Environmental Problem Solving, John
> Harte
>
> It is easier to bound a problem than to defend anybody's guess at the
> mean. The correct answer always seems to be "It Depends."
>
> Doug Hittle
>
>
>
>
> On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <qpwang at gatech.edu> wrote:
> >
> > Dear colleagues,
> >
> > I'm looking into furniture/internal mass modeling in energy models
> particularly within the environment of EnergyPlus but also not limited to
> that.
> >
> > I have two questions I guess:
> >
> > 1, Are there any modeling guide or reference building report that may
> give recommendations/instructions on how to represent furniture/internal
> mass inside a building if there is no much detailed information? I guess
> all I'm asking is are there any published data-set, or default values in
> terms of material property and area to represent furniture like what could
> be easily found about schedules and occupancy density?
> >
> > COMNET modeling guide has only one paragraph about it and it mentioned
> "The interior thermal mass and modeling assumptions in the baseline
> building shall be the same as the proposed design."
> > Currently what I have is from Building America House Simulation
> Protocols: "The internal mass of furniture and contents shall be equal to 8
> lb/ft2 of conditioned floor space. For solar distribution purposes,
> lightweight furniture covering 40% of the floor area shall be assumed."
> >
> > 2, DOE reference commercial buildings have internal mass objects in the
> idf. file, where does the information come from?
> >
> > Appreciate your input!
> >
> > Best,
> >
> > Qinpeng
> >
> > --
> >
> > Qinpeng Wang, PhD Student
> >
> > College of Architecture
> >
> > Georgia Institute of Technology
> >
> > Atlanta, GA 30332-0155
> >
> >
> > _______________________________________________
> > Bldg-sim mailing list
> > http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> > To unsubscribe from this mailing list send a blank message to
> BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
> >
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send a blank message to
> BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>
---------- Forwarded message ----------
From: Philip Haves <phaves at lbl.gov>
To: bldg-sim at lists.onebuilding.org, E+Sup <
EnergyPlus_Support at yahoogroups.com>
Cc:
Date: Mon, 14 Jan 2013 20:04:22 -0800
Subject: [Bldg-sim] HELP WANTED: Lawrence Berkeley National Laboratory
**
(Apologies for cross-posting)
Lawrence Berkeley National Laboratory has two new openings in the
Simulation Research Group:
1. Senior Scientific Engineering Associate. The main duties will include
further development of EnergyPlus, particularly modeling of HVAC systems,
and development of advanced simulation methods.
Details are posted at:
https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75476
For an informal discussion about this opening, call Philip Haves (510 486
6512 <%28510%20486%206512>).
2. Postdoctoral Fellow. The main duties include development of methods and
models to simulate the energy performance of buildings at the urban scale
and the development of methods and models to simulate human energy
behavior.
Details are posted at:
https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75499<https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75476>
For an informal discussion about this opening, call Tianzhen Hong (510 486
7082).
--
Philip Haves
Leader, Simulation Research Group
Lawrence Berkeley National Laboratory
One Cyclotron Road, MS 90R3111
Berkeley, CA 94720-8134(510) 486 6512 (office)(510) 486 4089 (fax)
---------- Forwarded message ----------
From: Joe Huang <yjhuang at whiteboxtechnologies.com>
To: bldg-sim at lists.onebuilding.org
Cc:
Date: Mon, 14 Jan 2013 21:13:00 -0800
Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?
**
I've had the same experience when comparing simulation results to measured
indoor temperatures for a typical house in California. The actual house
temperatures were substantially more flattened and lagged compared to what
the simulation showed. It may be that getting the right number on the
amount of internal mass might not necessarily result in a house model that
responds similar to a real building. Then you have to decide whether to
"tune" the model to be physically correct or thermally correct!
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556yjhuang at whiteboxtechnologies.comwww.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 1/14/2013 7:30 PM, Justin Spencer wrote:
There's also an issue here about whether or not there's any modeling of
internal partitions or fixtures included in your model. My personal
experience in modeling residential models is that they always lag more than
you expect, so I've regularly responded by jacking up the internal mass. I
certainly can fit metered HVAC data a lot better when I add mass beyond
what the BABM suggests. I've guessed that's because my partitions don't
quite match the amount of mass we're interacting with.
I get what Doug is saying that there isn't much temperature change
occurring in his bookshelf, but when you have literally several tons of
exposed mass, even a degree or two of temperature change is quite a bit of
heat. Those granite counters currently in fashion do something for the
building mass.
What's funny about this is that the conventional rule of thumb is that
residential construction is "light" and has little impact from mass, while
commercial buildings are "heavy" and have lots of mass impacts. My personal
experience in studying this is that mass is extremely important in
residential construction because they "float" a lot of the time and also
have higher solar gains than commercial spaces.
One possible area of fruitful research I've thought about is to try and
get some utility direct load control data and look at the "response time"
of residences in terms of how long it took to have the temperature rise a
certain amount when the HVAC system was constrained. You'd at least get
some good data about how responsive the houses are supposed to be and alter
what you can in your models to get them to better match real life (whether
or not you actually figured out the root cause of the problem in the
model).
On Mon, Jan 14, 2013 at 7:58 PM, Doug Hittle <hittle.doug at gmail.com> wrote:
I believe that E+ and predecessors take/took what ever was described
as "internal mass" and parsed it into an equivalent "partition" of
some "equivalent" area. This can lead to some counter intuitive
results. Most might expect that "internal" or "thermal" mass is going
to moderate energy transfer ("store"). But suppose I describe a
banquet hall full of folding mdf or plywood tables (light weight).
Compared to an empty room, the area available to absorb radiation and
convect it to the room is increased by easily 1/3. All of a sudden the
room is "fast" and energy gains are translated into cooling loads much
more quickly.
So let's agree with Joe that your question can be answered by "walking
around." In looking around my office I find that one partition is
covered with book cases and that the other side of the partition is
also covered with books. If I thought this was an important feature
that needed to be modeled (which I don't and which isn't) I would not
describe any internal equivalent mass, I would simply describe a
partition made up of books-air space-gyp board wall-air space-books.
But why do I think this is irrelevant additional work? I can weigh
some books to determine their density. We think books are heavy but
imagine putting an equivalent volume of concrete in your backpack.
Then they are not so "thermally massey". Also the books never receive
direct sunlight and the temperature in my office varies little because
it is in my heavily insulated, air tight home. Since the guzinta
equals the guzouta over time and since the guzinta and guzouta, even
for this massive double book lined partition, are near zero because
the materials are at constant temperature, more or less, the mass of
the books is not very important to the room energy balance.
I don't know what thermal mass is anyway. The term must have evolved
partly from passive solar designs, where energy storing materials
exposed to the sun are important, and from the brick trade
association who left a confusing legacy of claims that a masonry house
had a higher R-value because of the "thermal mass." Mind you I think
bricks are great, I have some myself. However, there is nothing in the
definition of R-value that is labeled "brick."
My apologies Dr. Wang. I expect that what I have just said is more or
less useless as an answer to you questions. However, a productive
guide to a first approach might be found in:
Consider a Spherical Cow: A Course in Environmental Problem Solving, John
Harte
It is easier to bound a problem than to defend anybody's guess at the
mean. The correct answer always seems to be "It Depends."
Doug Hittle
On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <qpwang at gatech.edu> wrote:
>
> Dear colleagues,
>
> I'm looking into furniture/internal mass modeling in energy models
particularly within the environment of EnergyPlus but also not limited to
that.
>
> I have two questions I guess:
>
> 1, Are there any modeling guide or reference building report that may
give recommendations/instructions on how to represent furniture/internal
mass inside a building if there is no much detailed information? I guess
all I'm asking is are there any published data-set, or default values in
terms of material property and area to represent furniture like what could
be easily found about schedules and occupancy density?
>
> COMNET modeling guide has only one paragraph about it and it mentioned
"The interior thermal mass and modeling assumptions in the baseline
building shall be the same as the proposed design."
> Currently what I have is from Building America House Simulation
Protocols: "The internal mass of furniture and contents shall be equal to 8
lb/ft2 of conditioned floor space. For solar distribution purposes,
lightweight furniture covering 40% of the floor area shall be assumed."
>
> 2, DOE reference commercial buildings have internal mass objects in the
idf. file, where does the information come from?
>
> Appreciate your input!
>
> Best,
>
> Qinpeng
>
> --
>
> Qinpeng Wang, PhD Student
>
> College of Architecture
>
> Georgia Institute of Technology
>
> Atlanta, GA 30332-0155
>
>
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>
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---------- Forwarded message ----------
From: Chris Yates <chris.malcolm.yates at gmail.com>
To: Qinpeng Wang <qpwang at gatech.edu>
Cc: bldg-sim at lists.onebuilding.org
Date: Tue, 15 Jan 2013 07:13:01 +0000
Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?
Perhaps mass could be related to occupancy quite easily. After all every
person needs a few square feet of desk, possibly some filing.
There is probably quite a simple arithmetic formula that holds true for
most situations, the arguments of which might be:
• occupant density
• desk space per occupant
• material thickness
• extra shelving required?
Ignore anything with less mass.
If you come up with an excel formula, I'd like a copy ;o)
Sent from my Android device. Please excuse typos, etc.
On 14 Jan 2013 20:16, "Qinpeng Wang" <qpwang at gatech.edu> wrote:
> Dear colleagues,
>
> I'm looking into furniture/internal mass modeling in energy models
> particularly within the environment of EnergyPlus but also not limited to
> that.
>
> I have two questions I guess:
>
> 1, Are there any modeling guide or reference building report that may give
> recommendations/instructions on how to represent furniture/internal mass
> inside a building if there is no much detailed information? I guess all I'm
> asking is are there any published data-set, or default values in terms of
> material property and area to represent furniture like what could be easily
> found about schedules and occupancy density?
>
> COMNET modeling guide has only one paragraph about it and it mentioned
> "The interior thermal mass and modeling assumptions in the baseline
> building shall be the same as the proposed design."
> Currently what I have is from Building America House Simulation Protocols:
> "The internal mass of furniture and contents shall be equal to 8 lb/ft2 of
> conditioned floor space. For solar distribution purposes, lightweight
> furniture covering 40% of the floor area shall be assumed."
>
> 2, DOE reference commercial buildings have internal mass objects in the
> idf. file, where does the information come from?
>
> Appreciate your input!
>
> Best,
>
> Qinpeng
>
> --
>
> Qinpeng Wang, PhD Student
>
> College of Architecture
>
> Georgia Institute of Technology
>
> Atlanta, GA 30332-0155
>
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send a blank message to
> BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
---------- Forwarded message ----------
From: Shruti Kasarekar <shrutiak at gmail.com>
To: bldg-sim <bldg-sim at lists.onebuilding.org>,
equest-users at lists.onebuilding.org
Cc:
Date: Tue, 15 Jan 2013 11:01:57 -0800
Subject: [Bldg-sim] Technical Staff position at Atelier Ten, San Francisco
Technical Staff
Atelier Ten, an environmental and lighting design consulting firm, is
seeking a full-time Technical Staff member to join our San Francisco
office. This position reports to an Associate.
A Technical Staff member supports interdisciplinary consulting teams with
research, calculations, daylighting analysis, technical writing, LEED
program administration, or any other technical analysis as required under
the direction of Associates and Environmental Designers. The successful
candidate will also assist other staff with energy analysis -related work,
primarily with DOE2 modeling software. This person may manage aspects of
individual projects as assigned, including responsibility for selected
deliverables. The Technical Staff member may be asked to participate in
business and professional development initiatives in coordination with
senior management.
Technical staff are expected to follow guidelines for project quality
assurance , frequently review project timelines and budgets with project
managers, demonstrate an empathy with Atelier Ten’s approach, and be
committed to the development of high-quality, high-performance and
sustainable buildings via the appropriate technical, project management,
and quality control standards.
*Education*
Bachelor’s degree in Architecture or Mechanical Engineering required.
Preference will be given to candidates who have completed coursework in
architectural engineering, including thermodynamics, fluid dynamics,
building systems, architectural studio experience, architectural history,
HVAC systems, building electrical systems, architectural lighting design,
construction means and methods, engineering statistics, engineering
drawing, and construction cost estimating. Fluency in written and spoken
English is required.
*Experience*
Proficiency in Microsoft Excel required. Proficiency in Visual Basic,
scripting, 3-D architectural modeling, AutoCad, Adobe InDesign and
Illustrator, and hand-drawing ability preferred. Professional or internship
experience in architecture or engineering offices preferred.
*Interested candidates should submit a CV and cover letter to
usa.recruitment at atelierten.com. Please reference “A10_SF_Tech Staff” in
your subject line.*
---
Shruti Kasarekar
Atelier Ten
www.atelierten.com
---------- Forwarded message ----------
From: John Aulbach <jra_sac at yahoo.com>
To: "bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Cc:
Date: Tue, 15 Jan 2013 12:08:30 -0800 (PST)
Subject: [Bldg-sim] Window Film Product Claims
Hi Folks:
This has to do with modeling in general.
I have a Window Film manufacturer with a product called Enerlogic VEP35
window film. It is apparently applied to the inside of a window.
The manufacturer claims that this product lowers the U-Value of single pane
glass (1/4" or 6 mm) from 1.109 to 0.6. And with no air space between the
film and the glass. "Revolutionary new technology"
Has anyone ever run into this product before? Why does this claim sound
"too good to be true" ??
Thanks.
John Aulbach
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