[Equest-users] Gated Community & Roof reflectivity

Nick Caton ncaton at smithboucher.com
Wed Apr 11 12:04:04 PDT 2012

To Yusuf's more recent question below:

What you're describing (varying the rotation/layout only with all else remaining constant) sounds most easily accomplished in a single file, within the wizard stage.  Set up your first building (ideally as a single shell), then create new shells by copying the first - editing the rotation and internal layout as necessary.  If/when you have everything set up, you can save multiple copies of the file and remove the shells you don't want for each case to isolate to the correct building.  You shouldn't need re-enter the same information twice.

To something Yusuf mentioned earlier:

Modeling the savings of solar street/landscape lighting can be re-stated as determining the energy consumption of a "non-solar equivalent."  This is a lot trickier than it may seem on the surface.  Much of that complexity is tied up in what "non-solar equivalent" means in reality:  Dig hard at the cutsheets of the solar equipment in question to come up with some hard numbers for photometrics and runtime realities.  If you are not trained/familiar with photometric lighting design software you may want to engage someone who is to help you along the way.

[cid:489575314 at 22072009-0ABB]


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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Yusuf Turab
Sent: Wednesday, April 11, 2012 1:30 PM
To: Bruce Easterbrook
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Gated Community & Roof reflectivity

Thank you. I guess I have someway to go before I have system sizing and unmet hours fully figured out. One more question:

  *   If I want to create multiple buildings of similar type, built up area and construction but different conditioned spaces, interior layouts and orientations. Can I simply make a copy of the old pd2 file and simply change the footprint zone and orientation in the new file? I tried to do this but I cannot see the 3D model of the new building.

Does this mean every model has to be created from scratch?

Many Thanks


On 11 April 2012 19:03, Bruce Easterbrook <bruce5 at bellnet.ca<mailto:bruce5 at bellnet.ca>> wrote:
Auto sizing is to ball park your system.  There is no computer program which with the press of a button will design your building for you.  You have unmet hours because you have conflicts in your design. You now have to identify the conflicts and resolve them.  eQuest works by prioritizing the cooling system, hence when you have conflicts they show up mostly as unheated hours.  eQuest has a low default on airflow, 0.5 cfm/SF, this many times is a good place to start.  Depending on where you are 0.75 or 1.0 could work better.  You can also vary the flow to different zones independently.  You can't put 0.5 cfm into 20 spaces from the same AHU and expect the heating and cooling needs of each space to be met 100% of the time.  Get into your sim file and figure out where the spaces are with large unmet hours, figure out why and start adjusting the inputs to reduce them.
There is no point to average the 4 orientations, nor is it allowed, just LEED mumbo jumbo.  It just illustrates how the orientation of your building effects the energy consumption to run it.  Most modellers get a building, a street, a front and back with no option on orientation.  That is your base case.  It can be handy to illustrate design flaws if there is a large difference in energy consumption in different directions.  Just don't call it that when you are telling the architect a 20 story atrium is not a great idea on the north side of a building. lol.
Bruce Easterbrook P.Eng.
Abode Engineering

On 10/04/2012 02:53 PM, Yusuf Turab wrote:
Hello Group

  *   Why do I get unmet hours even when I select the auto size option in the HVAC system? What is the point of auto sizing?
  *   Is there a way to simulate all 4 orientations and get an average result for the base case?

Yusuf Turab
IGBC Accredited Professional, LEED Green Associate & GRIHA Trainer
Y T Enterprises
18 A, Hamsa Layout | R.S Puram | Coimbatore - 641002


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On 10 April 2012 00:54, Yusuf Turab <yusuf at ytenterprises.com<mailto:yusuf at ytenterprises.com>> wrote:
Hello Group

             I have just started working on my first energy modeling project. I have two questions:

  *   How do I model roof reflectivity. I want to model a roof of 4 inch concrete with 1 inch stucco at the bottom and top and cover the roof with cool roof tiles. I am not sure how I can account for the energy efficiency gains compared to base case through a high SRI roof.
  *   I am trying to model a large gated community with 330 villas and 7 other common buildings. As someone suggested on this group I am modeling each building type separately and using excel to come up with a total energy usage. But I am not sure how to model the street lighting and landscape lighting at the exteriors. We plan to use solar street lights and I want to demonstrate the savings through use of solar energy.
Many Thanks

Yusuf Turab

On 10 April 2012 00:32, nirupama lakshminarasimhan <nirupamalnarasimhan at gmail.com<mailto:nirupamalnarasimhan at gmail.com>> wrote:

I am modeling a big public school with a lot of systems and custom windows. The equest file we have right now is taking too long to load. I've tried opening it from different locations- the default equest project folder on C: , the public server, external HDD, etc. It is just too slow in "importing project data" when it opens. The last time this happened, it was taking too long to load the BDL file and I ended up deleting a host of systems and starting from scratch. All my files- the .inp, .pd2, etc are in the same path. I just cannot get it to work faster. I'm trying to calibrate the model and it is an awfully long wait for each simulation. Does someone have any thoughts on how I could get this to work faster?

Thank you.


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