[Equest-users] VAV system unmet hours

[Howe, Timothy]

What is your preheat coil design leaving air temp, right now you have it set to the default 45°F and with the reheat only providing a 30°F and the supply flow locked in your heating air temp can only be 75°F.  
 
soooo... Q = CFM * 1.085 * Delta T
 
You have it so both the cfm and delta T are set, therefore your Q is limit to those parameters.  You can either increase the preheat LAT so you get a greater delta T or remove the design CFM supply flow you have entered.
 
Timothy Howe, MS, LEED® AP
Mechanical Engineer
Stantec
2060 Brighton-Henrietta Town Line Road
Rochester NY 14623-2792
Ph:   (585) 413-5347
Fx:   (585) 272-1814
Cell: (585) 330-8681

stantec.com <http://www.stantec.com/>  
 
The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.
 
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________________________________

From: Brett M. West [mailto:bwest at rmf.com] 
Sent: Wednesday, August 26, 2009 4:05 PM
To: Howe, Timothy; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] VAV system unmet hours



Sorry. Here is the correct inp file.

 

Brett M. West

Design Engineer-Mechanical

 

RMF Engineering, Inc.

T: 843-971-9639 ext. 1499

F: 843-971-9641

bwest at rmf.com <mailto:bwest at rmf.com> 

From: Howe, Timothy [mailto:Timothy.Howe at stantec.com] 
Sent: Wednesday, August 26, 2009 3:59 PM
To: Brett M. West; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] VAV system unmet hours

 

Wrong .inp file.  send out the one without "- Baseline Design" after your file name

 

Timothy Howe, MS, LEED® AP
Mechanical Engineer
Stantec
2060 Brighton-Henrietta Town Line Road
Rochester NY 14623-2792
Ph:   (585) 413-5347
Fx:   (585) 272-1814
Cell: (585) 330-8681

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

 

The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.

 

ü 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 Brett M. West
Sent: Wednesday, August 26, 2009 3:55 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] VAV system unmet hours

 

I am modeling a system which consists of rooftop AHU's that serve multiple VAV boxes in a classroom/office building. The AHU's are served by chilled water and hot water loops for conditioning. The problem I am having is that the systems are coming up in the SS-R report as having large amounts of unmet hours. Even if I try to manually add heating to the systems there is no affect on the hours. I have attached the pd2 and inp files. Any suggestions would be appreciated. Thanks

 

 

Brett M. West

Design Engineer-Mechanical

 

RMF Engineering, Inc.

T: 843-971-9639 ext. 1499

F: 843-971-9641

bwest at rmf.com <mailto:bwest at rmf.com> 

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