[Equest-users] Walls and Zones

[Katie Tuttle]

To follow up on the previous questions, I've wondered the same thing -
what if you want to assign multiple spaces to one zone in eQuest?  For
example, two rooms are being supplied by the same VAV box.  They need to
be created as two SPACES (on the "Building Shell" and "Internal Loads"
tabs) because of different internal loads, but then on the "Air-Side
HVAC" tab, both of the spaces need to be assigned to one ZONE.  Is this
possible?

 

Thanks!

 

KATIE L. M. TUTTLE EI, LEED(r) AP
Mechanical Designer

 

Henderson Engineers, Inc.   8325 Lenexa Drive  Lenexa, KS 66214
dir 913 742 5508  tel 913 742 5000  fax 913 742 5001   www.hei-eng.com
<http://www.hei-eng.com/> 

 

 

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James
Hansen
Sent: Tuesday, January 12, 2010 6:31 AM
To: omoltay at mimtarch.com; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Walls and Zones

 

Instead of deleting interior walls, why not just convert them do a
different type?  If I have a large open office with multiple zones, I'll
just set up all interior walls to be of type "Air".

 

Here are the available wall types from the help file:

 

INT-WALL-TYPE

Specifies the type of interior wall through code-words that identify the
type of heat transfer that occurs across the wall.

 

STANDARD                  

 

The default. Designates an interior wall that separates two spaces and
conducts heat between the spaces. It can be defined with a CONSTRUCTION
with TYPE=U-VALUE or TYPE=LAYERS although the heat storage effects of
the wall are accounted for only if TYPE=LAYERS. If you choose a
CONSTRUCTION with TYPE=U-VALUE, the U-value should be less than 0.709
Btu/ft2-F-hr (4.02 W/m2-K), which is the limiting value for two air
films and a very low resistance solid layer.  The NEXT-TO keyword is
required for this wall type. However, if the NEXT-TO space is the same
as the space in which the wall was defined, the program will change
INT-WALL-TYPE to ADIABATIC.

 

ADIABATIC                  

 

Designates an interior surface that does not conduct heat between spaces
but can store heat. This type should be used to separate spaces that are
considered to be identical and are, therefore, defined with MULTIPLIER
or FLOOR-MULTIPLIER in the SPACE command. An example is the wall,
ceiling, or floor that separates identical spaces that are side-by-side
on one floor of a building or above one another in a multistory
building. This type of wall should have delayed construction.

 

INTERNAL                   

 

Designates an interior surface that lies completely inside a space. An
example is a water wall used to store solar energy in a space. Another
example is a wall between two rooms that are modeled as a single space.
This type of wall should have a construction with TYPE=LAYERS; in this
case the thermal mass of the wall will be considered in the space's
custom weighting factor calculation

 

AIR                             

 

Designates a non-physical interior surface with no mass (i.e., an
opening between spaces) across which convection can take place. This
type of wall should have a CONSTRUCTION with TYPE=U-VALUE. In this case,
we recommend an approximate U-value of 2.7 Btu/ft2-hr (15.3 W/m2). The
NEXT-TO keyword is required for this wall type.

 

                                  

If the "AIR wall" is part of a daylit space, its INSIDE-VIS-REFL values
need to be specified (even though it is not a physical wall) since
daylight can be reflected back across the AIR wall from the adjacent
space. The values to use for INSIDE-VIS-REFL in this case are determined
as follows. Assume that the AIR wall, of area A, is defined in space 1
and separates space 1 and space 2. Let the spaces have inside surface
area Si (excluding the AIR wall) and area-weighted visible reflectance
ri excluding the AIR wall). Then INSIDE-VIS-REFL=(R2 , R1) where Ri is
the cavity reflectance of space i given by

            Ri = A * ri / (Si - (Si -A)*rI)

 

 

 

 

GHT Limited

James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com

 

 

-----Original Message-----

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
omoltay at mimtarch.com

Sent: Monday, January 11, 2010 6:54 PM

To: equest-users at lists.onebuilding.org

Subject: [Equest-users] Walls and Zones

 

Dear all,

 

I have not received a reply to my previous question, so here is a

simplified version of it: I see that everytime I create a zone in the

Wizards, eQuest builds walls around these zones. Does every zone (or
every

space) need to have walls around? Would it be a problem if I delete
these

walls afterwards?

 

For example, when I have a large open office, I would like to have
several

zones. So after the Wizard creates the building description, I have to

delete all the walls around these zones.

 

Is this normal procedure?

 

Thanks,

 

Omer Moltay, LEED AP

 

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