[Equest-users] Baseline Airflow Autosizing

[Christina Galyfianaki]

Hi Josua!

 

Thanks for replying.

Yes you were right that the DT at the fan power and control
specification has to do with the motor heat.

The Delta T of 20 degrees will be the difference between the
Cooling/Heating indoor design temperature (specified at the Zone
Parameters) and the Zone entering Min/Max Supply temperature specified
at the HVAC Systems Parameters. So this is the way to input your DT.
What do other eQuest user say?

 

What about using auto-sizing on Proposed building, was any project
accepted by the USGBC done this way?

 

Regards

 

Christina Galyfianaki 
Simulation Consultant

Building Physics Division

 

LCEA CIBSE Accredited, EPCs levels 3/4/5

 

 

 

hurleypalmerflatt 

building sustainability                     

 

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e:         christina.galyfianaki at hurleypalmerflatt.com

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________________________________

From: Joshua Wolfe [mailto:jwolfe at geo-marine.com] 
Sent: 26 October 2009 18:10
To: Christina Galyfianaki; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Baseline Airflow Autosizing

 

Christina,

 

I always just solve the equation in AHSRAE 90.1 for kW/cfm and input
directly into eQuest. The Delta T box you are referring to, is the
increase in temperature of the airflow due to motor heat at design
conditions I leave default in baseline case(2-4F usually). I always let
the program autosize in the baseline case 1.00 for system, 1.15 for
cooling and 1.25 for heating. I then look at SV-A reports to get maximum
heat extraction rate of the equipment and calculate my dt's
(1.08*cfm*dt) which I then adjust airflows for each zone to match the
20F found in ASHRAE 90.1. I have not found a way to directly input
design delta T (20F per ASHRAE) of zones to calculate airflow. Maybe
someone else can knows a better way and will answer this post.  Hope
that helps some. 

 

Josh

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Christina Galyfianaki
Sent: Monday, October 26, 2009 10:50 AM
To: Matutinovic, Luka; reniel barroso;
equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Baseline Airflow Autosizing

 

Hello everybody

 

I use the auto-sizing option as Luca described and I trusted that the
when specifying the Sizing Ratio to be 1.15 for cooling and 1.25 for
heating would give me the equipment capacity as required by G3.1.2.2. 

I then run the baseline for the first time just to get the supply
airflows (cfm) from the SV-A Report. Then I used this value to find the
fan Brake Horse power from Table G3.1.2.9 and then calculated the Pfan
from the formula G3.1.2.9

Then I find the fraction of fan power per flow Rate in kW/cfm and input
this value with a DT of 19.8 (as per G3.1.2.8)

 

 

 

It seemed to work fine and the USGBC accepted the model. I am really
interested to double-check with other modellers methodology. 

But mostly I want to ask the following Question:

 

Do you use the auto-sizing method for the Proposed building?

 

You can still input the actual Sizing ratio, DT and kW/cfm of your
design that will determine your energy consumption and thus reflect your
design principles. I will appreciate the feedback of the experienced
users. 

 

Kind Regards,

Christina

 

 

Christina Galyfianaki 
Simulation Consultant

Building Physics Division

 

LCEA CIBSE Accredited, EPCs levels 3/4/5

 

 

 

hurleypalmerflatt 

building sustainability                     

 

d:         +44(0) 20 7535 3106

t:          +44(0) 20 7535 3100
f:          +44(0) 20 7535 3101


e:         christina.galyfianaki at hurleypalmerflatt.com

w:        www.hurleypalmerflatt.com <http://www.hurleypalmerflatt.com> 

 

View company email disclaimer at: 
http://owa.hurleypalmerflatt.com/disclaimer.asp

*

P Please consider the environment before printing this email.

 

 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Matutinovic, Luka
Sent: 26 October 2009 13:33
To: reniel barroso; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Baseline Airflow Autosizing

 

Reniel,

 

Are you referring to the sizing runs from G3.1.2.2.1?  If so, leave the
design cfm on each air-handler blank (see screenshot below) and eQuest
will size the flows based on the sizing option you've specified (Click
on a system, go the Basics tab, and see "Sizing Option").  

 

If you need to size the baseline equipment capacity as per G3.1.2.2,
then multiply the auto-sized flows from the first step, by 1.25 for
heating and 1.15 for cooling and enter the result as the design cfm.

 

I think you might be able to do the second step directly by specifying a
sizing ratio (see second screenshot), although for whatever reason I
haven't done it this way in the past, so I'd be curious to hear from the
more experience eQuesters what approach they take.

 

Hope the helps,

 

Luka Matutinovic, B.A.Sc., LEED(r) AP

Green Building Consultant
 
T. 416.644.0649

F. 416.487.9766  
Toll Free 1.888.425.7255
www.halsall.com 

HALSALL ASSOCIATES LTD. 
Toronto  Richmond Hill  Ottawa  Sudbury 
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'50 Best Workplaces in Canada' 
2009 Globe and Mail
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________________________________

From: reniel barroso [mailto:renielbarroso at yahoo.com] 
Sent: Sunday, October 25, 2009 1:37 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Baseline Airflow Autosizing

 

I've been trying to look on the equest interface where we can set the
airflow to autosize itself as per LEED baseline requirement.

I don't think we have this option here. Have we?

 

Thanks in advance.

 

Reniel


 

 

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