[Equest-users] Gated Community & Roof reflectivity

[Shaun Martin]

Yusuf,
 
Also check your thermostat throttling ranges and whether the unmet hours are
occuring at system startup.
 
Shaun Martin LEED AP
Principal
Shaun Martin Consulting
2060 Pine Street, Vancouver BC V6J 4P8
604-789-1095
smartin at shaunmartinconsulting.com
member CAGBC, ASHRAE

 

  _____  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bruce
Easterbrook
Sent: Wednesday, April 11, 2012 6:33 AM
To: Yusuf Turab
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Gated Community & Roof reflectivity


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? 

Thanks


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

http://www.ytenterprises.com/

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On 10 April 2012 00:54, Yusuf Turab <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> 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.

Nirupama


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