[BLDG-SIM] System 6 and High Efficiency Window - DX with Fan boxes

Scott Rushing scottr at rushingco.com
Wed Nov 21 04:06:24 PST 2007


When trying to model as described below the Electric DX selection isn't
available in the Cap/Control subtab. 

Any tips as to modeling water cooled DX ACU's with fan powered boxes are
appreciated. 

Thank you.

 

 

Scott Rushing, PE, LEEDR AP

Principal

direct: 206.285.7106

cell: 206.321.3300 

www.rushingco.com <http://www.rushingco.com/> 

 

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Jeff
Hirsch
Sent: Friday, August 24, 2007 7:01 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] System 6 and High Efficiency Window

 

In version 3.61 and earlier the eQUEST wizards do not have an option for

DX AHU with PIU zone boxes.  However, in the detail mode, if a PIU system
has

been defined you can open the AHU property sheet, go to the cooling tab
and

on the coil Cap/Control subtab change the Cool Source from chilled water
to

Electric DX.  You should then set to default any CHW loop connection and

related values (lower in that column on the subtab) and then you can
delete

the chiller(s), cooling tower(s) and CHW loop (in that order) if no longer

used.

 

In the next release (3.62) DX cooling for PIU AHUs will also available in
the wizards.

 

--- 
Jeff Hirsch
Building Performance Analysis Software & Consulting
12185 Presilla Road
Camarillo, CA 93012-9243 USA
phone: (805) 553-9000
fax: (805) 532-2401
email: Jeff.Hirsch at DOE2.com
web: http://DOE2.com <http://doe2.com/> 

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

From: Garcia, Robert <mailto:RGarcia at akf-eng.com>  

To: BLDG-SIM at gard.com 

Sent: Thursday, August 23, 2007 9:56 AM

Subject: [BLDG-SIM] System 6 and High Efficiency Window

 

There seems to be little reponse to the issue of modeling System 6 of
ASHRAE 90.1-2004.  Has anyone been able to model a Packaged VAV with PFP
Boxes in eQUEST?

 

Robert Garcia

AKF Engineers, LLP
1500 Walnut Street, Suite 1400
Philadelphia, PA 19102 
Phone:   (215) 282-2182

Fax:        (215) 735-6706
www.akf-engineers.com

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Garcia,
Robert
Sent: Wednesday, August 22, 2007 2:46 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] System 6 and High Efficiency Window

I would like to discuss question number 1 as well.  Appendix G specifies
that Direct Expansion be used as the cooling type for System 6.  However,
the PIU system in eQuest does not allow you to use DX coils.  I have seen
several archived posts on this same question that say to model a chiller
equivalent to the DX coils, but nothing further.  I have redefined the
chiller performance curves accordingly with no success.  Has anyone set up
this system succesfully in eQuest?  

 

In response to Questions 2 and 3, the U-value and Shading Coefficient of
the glass has significant impact on the energy savings with the HVAC
system.  In addition, the visible light transmittance of the glass
directly impacts the Daylighting controls within the rooms affecting
electric usage.  The selection of glass should be investigated when
determining the window-wall ratio and the resulting savings.

 

Robert Garcia

AKF Engineers, LLP
1500 Walnut Street, Suite 1400
Philadelphia, PA 19102 
Phone:   (215) 282-2182

Fax:        (215) 735-6706
 <http://www.akf-engineers.com/> www.akf-engineers.com

 

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Virdi
Permana
Sent: Wednesday, August 22, 2007 1:59 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] System 6 and High Efficiency Window

Hello All,

Quick question on System 6: Package VAV w/PFP boxes.

1.	How do you use system 6 in eQUEST? Do you have to use parallel PIU
at the zone? 
2.	At what percentage of window to wall ratio that high efficiency
can star contribute significant saving? 
3.	At what number is considered significant saving? 

Any respond is greatly appreciated.

 

Sincerely,

 

Virdiansyah "Virdi" Permana

EMSI

Energy Analyst

(202) 291 3102 T

(202) 291 3107 F 

 

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