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

[Cheney]

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*
<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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