[Bldg-sim] Does 90.1 Minimum Efficiency Requirements include fans?

[Larry Degelman]

Felipe,

You may find it of interest that one of the options in the Tables that James Dirkes mentioned is to use brake h.p. in place of name plate h.p. for the fan motors.  Using brake h.p. seems to lessen the burden on the designer by allowing numerous power adjustments based on the various items in the air circuit that cause added friction losses – like MERV filters, sound attenuators, etc.  The adjustments are found in the second table (6.5.3.1.1B).  This is common to both the 2007 and the 2010 versions. 

In addition, you might be interested to look at the proposed Addendum BL (for version 2010) that would require the user to remove fan energy from equipment where the fan energy is included in the energy efficiency rating of the equipment, when using Chapter 11 (ECB Method) and Appendix G.  This addendum includes a methodology for removing the fan energy from packaged equipment efficiency ratings.  

Regards,

LOD
===============================
Larry O. Degelman, P.E., BEMP, HBDP
Professor Emeritus of Architecture
Texas A&M University
2206 Quail Run
College Station, TX 77845
Ph: 979-307-1746
URL: http://enerwin.com
===============================

From: Jim Dirkes 
Sent: Wednesday, November 21, 2012 6:10 PM
To: Felipe Duran ; bldg-sim at lists.onebuilding.org 
Subject: Re: [Bldg-sim] Does 90.1 Minimum Efficiency Requirements include fans?

Felipe,

This may help…. (there are fan power limitations)

 

      Item
     ASHRAE 90.1-2007 reference
     Baseline systems affected
     
      Fan Power Limitations and part load curve 
     Tables 6.5.3.1.1A & B, Table G3.1.3.15
     all
     
      Fan Power Limitations
     G3.1.3.14
     6, 8
     

 

 

 

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com 
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Felipe Duran
Sent: Wednesday, November 21, 2012 1:56 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Does 90.1 Minimum Efficiency Requirements include fans?

 

Dear Group,

 

Does 90.1 Minimum Efficiency Requirements include fan energy?, I am referring to table 6.8.A which specifies for air conditioners less that 8.8 kW capacity a minimum COP of 3.52.

Since my building does now have a cooling system I have to use the baseline system (PTAC) and I am not sure if I have to model fans explicitly. 

 

Kind Regards,

 



 



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