[Equest-users] backup heating - LEED

Ana N. ananeddav at hotmail.com
Wed Dec 22 20:37:06 PST 2010


Hi Nick,
 
 Heat pumps in this project are sized to meet peak heating load and the district plant will be used in case of heat pump failure. Thanks for sharing your thoughts. 
 
Ana

 


Subject: RE: [Equest-users] backup heating - LEED
Date: Wed, 22 Dec 2010 12:07:45 -0600
From: ncaton at smithboucher.com
To: ananeddav at hotmail.com; equest-users at lists.onebuilding.org








Hi Ana,
 
If the primary heating source (heatpumps) is of sufficient capacity to handle the peak heating loads, I suspect they will be capable of providing the heating for most of the heating season… but I didn’t do your mechanical design and am unsure of the details.
 
Look up and determine for yourself:  When will the backup plant heating be required and used under normal operation?  Do the heatpumps lock out when the OA drops below a certain temperature or under other conditions?  If so, are such conditions present in your model/weather file and to what extent?  
 
If the backup plant heating is only there redundantly (in case of equipment failure), then there’s no question:  you needn’t include it in your model to begin with and the baseline should be electric.
 
The fine print below TG3.1.1A says you should select between Fossil Fuel and Electric, when both are used, based on “the predominant condition.”  That term isn’t fleshed out anywhere I’m aware of, so if push came to shove you might defend your choice to use electric by comparing the number of hours in the heating season wherein the conditions you determined above are satisfied against those where they are not.  
 
Those are my thoughts anyway, hope that helps!
 
~Nick
 
 


 
NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com 
 


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ana N.
Sent: Wednesday, December 22, 2010 8:40 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] backup heating - LEED
 
Dear all,
 
Does anyone know how LEED treats backup heating?
 
I have a project with a district plant being used as a back up. The proposed design uses heat pumps sized to meet peak heating load. My first thought was to select the baseline system based on fossil fuel heating since the district plant uses fossil fuel. If I do so, I will have to select fossil fuel as primary heating source when I actually have zero fossil fuel consumption in my proposed case, which does not make much sense.” Required treatment of district thermal energy in LEED–NC version 2.2 and LEED for Schools” does not provide any specific guidance when district plant is used as a back up heating source. 
 
However “CHP Calculation Methodology for LEED-NC v2.0/v2.1 EA Credit 1 “states that Budget Building heating and cooling plant utilizes the backup energy source(s) of the Proposed Design.
Although I do not have CHP in my project, this led me think I should use fossil fuel as a heating type to select the baseline system type.

Any opinions would be greatly appreciated.



Ana

  		 	   		  
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