[Bldg-sim] Clarification of Reference Building's Heating Plant for MNECB 1997 LEED NC Compliance

[Dónal O'Connor]

Hi Aaron and Cheney,

 

Thank you for your input, I greatly appreciate it.


Regards,

 

Dónal
 



From: asmith at mreng.ca
To: chenyu73 at gmail.com; oconnor_dj at hotmail.com
CC: bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Clarification of Reference Building's Heating Plant for MNECB 1997 LEED NC Compliance
Date: Fri, 8 Aug 2014 17:28:41 -0300







Hi,
 
I agree.  For what its worth I’ve done central GSHP systems in EE4 and it uses an electric boiler feeding hydronic heating coils in the AHUs for the reference building.  We also had an electric backup/supplemental boiler.
 
Aaron  
 

 
Aaron Smith, P.Eng 
M&R Engineering 




From: Cheney [mailto:chenyu73 at gmail.com] 
Sent: Friday, August 08, 2014 3:17 PM
To: Dónal O'Connor
Cc: Building Sim Forum
Subject: Re: [Bldg-sim] Clarification of Reference Building's Heating Plant for MNECB 1997 LEED NC Compliance
 


Hi Dónal, 

 

Your case will be more complicated if your backup boiler using an energy source other than electricity and it will be triggered in the simulation. I believe your assumption is correct  and the baseline heating plant is an electric hot water boiler. 

 




Best Regards, 

Cheney

Connect with me and view my   http://lnkd.in/bqQf52i
 

On Fri, Aug 8, 2014 at 10:32 AM, Dónal O'Connor <oconnor_dj at hotmail.com> wrote:


Hi all,
 
I am looking for clarification of what the reference building’s heating plant should be in accordance with MNECB 1997 for LEED Canada NC compliance. 
 
The proposed building’s heating plant is a central GSHP system, supplying hot water to heating coils in individual constant volume AHUs and also zone reheat coils. The GSHP system will also have auxiliary electric back-up boilers when the GSHP system is unable to provide 100% heating capacity.
 
According to the “Performance Compliance for Buildings” document, “Table 5.4.1.B Reference Case: System AHU2-Multiple Zone” states:
 
1)      If the proposed design is electric heat, then electric resistance heat (see Article 5.4.7.1)

2)      If the proposed design is a heat pump, then see Article 5.4.7.2

3)      If the proposed design is fuel fired and not hydronic, then fuel fired furnace (see Article 5.4.7.3)

4)      If the proposed design is hydronic, then hot water boiler (see Article 5.4.7.2)

 

My initial thought process is that it will be (2), so according to Article 5.4.7.2:
 
“If, for the proposed design, the secondary system is an electric heat pump and none of the heating capacity for auxiliary heating or terminal heating in thermal blocks served by the secondary system is from a source having an energy source adjustment factor (from Appendix D of the code) less than that for “heat pump”, then the corresponding secondary system for the reference case shall be electric heat pump having a constant COP equal to the reciprocal of the energy source adjustment factor for heat pump”.
 
However “secondary system” to me implies terminal heat pumps which the proposed design is not. So according to (4) hydronic hot water boiler, Article 5.4.7.2 states:
 
“If, for the proposed design, the secondary system heating or terminal heating in thermal blocks served by the secondary system includes capacity that is hydronic, except in the case of an air-to-air heat pump, then the corresponding secondary system for the reference case shall be hydronic with a fuel fired heating plant with the fuel for the reference system heating plant being the same as the proposed design.
 
So the reference building’s heating plant should be hydronic with electric boilers. Would this be the correct assumption?
 
Thanks in advance for any comments.
 
Dónal

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