[bldg-sim] Modeling buildings with natural ventilation for Appendix G

Jon McHugh Jon.McHugh at h-m-g.com
Thu Dec 21 11:44:12 PST 2006


Mike,
 
The prescribed range being what?  Is there a schedule of high and low
temperatures that are called out in Appendix G?
 
Thanks,
 
Jon

________________________________

From: Mike Tillou [mailto:miket at etcgrp.com] 
Sent: Thursday, December 21, 2006 11:12 AM
To: Jon McHugh; bldg-sim at gard.com
Subject: RE: [bldg-sim] Modeling buildings with natural ventilation for
Appendix G


I have always gone under the assumption that my results have to meet the
criteria for zone temperatures being within the prescribed range.
 
MMT
 

Michael Tillou, PE 
ETC Group, Inc - Energy Engineering for a Sustainable Future 
Ph:413-458-9870 

	-----Original Message-----
	From: Jon McHugh [mailto:Jon.McHugh at h-m-g.com] 
	Sent: Tuesday, December 19, 2006 1:25 PM
	To: Mike Tillou; bldg-sim at gard.com
	Subject: RE: [bldg-sim] Modeling buildings with natural
ventilation for Appendix G
	
	
	Mike,
	 
	Does this proposed methodology place limits on the number of
occupied hours above or below a given temperature/RH?
	 
	Thanks,
	 
	Jon McHugh

________________________________

	From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of
Mike Tillou
	Sent: Tuesday, December 19, 2006 7:18 AM
	To: bldg-sim at gard.com
	Subject: [bldg-sim] Modeling buildings with natural ventilation
for Appendix G
	
	
	Ramana,
	 
	The ASHRAE 90.1 ECB sub-committee is working on a methodology
for simulating natural ventilation within the framework of Appendix G
but I don't think its finished yet.  In the meantime here is what I
would recommend.
	 
	Appendix G / 90.1 ECB allows you to use an exception calculation
method to simulate hybrid systems or unique efficiency measures to
demonstrate above-standard performance.  I think this would certainly
apply in your case.   
	 
	Here's what I have done on projects requiring an exception
calculation method.  
	1. Establish your energy cost budget and your design energy case
following the Appendix G guidelines.  
	2. Create a second model using the Design Energy Case as the
baseline and make the necessary modifications to simulate radiant
heating / no cooling via natural ventilation.  
	3. Report the energy savings from your exception calculation as
a line item at the end of your LEED EA-1 summary table (similar to how
renewable energy is reported). 
	4.  Include a seperate summary table  for the exception
calculation showing the energy end-use breakdown and how you arrived at
the cost savings.  Show both the baseline and proposed energy use.  
	5. Make sure the savings are reasonable and prudent for the
system you are proposing.  
	6. Document any changes to the model especially changes to
schedules that were necessary to properly simulate your system. 
	7. Make it easy for someone to review your assumptions and the
methodology you used to estimate the savings
	 
	I hope this helps.  Good luck.
	 
	Mike
	 

	Michael Tillou, PE 
	ETC Group, Inc - Energy Engineering for a Sustainable Future 
	Ph:413-458-9870 

		-----Original Message-----
		From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On
Behalf Of Ramana Koti
		Sent: Monday, December 18, 2006 4:53 PM
		To: bldg-sim at gard.com
		Subject: [bldg-sim] Modeling buildings with natural
ventilation for Appendix G
		
		
		Dear all,
		
		Is ignoring natural ventilation in both proposed and
baseline designs an accepted/fair way of modeling based on Appendix G
(ASHRAE 90.1-2004)?
		
		Part of the proposed design has (radiant heating +
natural ventilation) with no cooling which was modeled as a radiant
slab, no cooling, natural ventilation ignored. 
		
		But the Baseline HVAC system based on Appendix G is
System 5: Packaged VAV w/Reheat. (Natural ventilation can be modeled
based on Air Change method or Sherman Grimsrud method though I do not
know how to do it).
		
		I cannot decide how to make the baseline and proposed
comparable with respect to Natural Ventilation (in a manner acceptable
to LEED review), suggestions will be appreciated.
		
		Thanks,
		
		Ramana Koti, Sustainable Building Analyst 
		LEED AP
		
		ELEMENTS | a division of berkebile nelson immenschuh
mcdowell architects
		106 W. 14th Street Suite 200
		Kansas City, Missouri 64105
		
		p 816.783.1635 f 816.783.1501
		www.bnim.com| elements.bnim.com
		
		

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