[Bldg-sim] Clarification of Reference Building's Heating Plant for MNECB 1997 LEED NC Compliance
asmith at mreng.ca
Fri Aug 8 13:28:41 PDT 2014
I agree. For what its worth Ive 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 Smith, P.Eng
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
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.
Connect with me and view my
On Fri, Aug 8, 2014 at 10:32 AM, Dónal O'Connor <oconnor_dj at hotmail.com>
I am looking for clarification of what the reference buildings heating
plant should be in accordance with MNECB 1997 for LEED Canada NC compliance.
The proposed buildings 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 22.214.171.124)
2) If the proposed design is a heat pump, then see Article 126.96.36.199
3) If the proposed design is fuel fired and not hydronic, then fuel
fired furnace (see Article 188.8.131.52)
4) If the proposed design is hydronic, then hot water boiler (see
My initial thought process is that it will be (2), so according to Article
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 184.108.40.206 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 buildings heating plant should be hydronic with electric
boilers. Would this be the correct assumption?
Thanks in advance for any comments.
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