[Bldg-sim] Modeling to the MNECB in canada

[Brian Fountain]

Item 1 - the ESAF's are used in defining the reference building envelope 
parameters -- that is why you must define the primary heating source for 
each zone.  In practise, you just use the energy consumption & costs 
from EE4 to populate the LEED Canada letter template.  The ESAF's are 
not used in the EA-Cr 1 or EA Pr 2 calculations.

Item 2 - your interpretation is not correct.  There is a document called 
the Performance Compliance for Buildings which defines the reference 
building (automatically generated by EE4).  Roughly translated, the 
reference building has a single 80% efficient boiler (if you have 
hydronic heating in the proposed building, it has 1 or 2 chillers (2 if 
your plant exceeds 700 tons) with a COP of 5.2.  There are 3 reference 
building types -- single zone, residential (hotels, dorms etc) ... and 
everything else which has a VAV reference system type.

The MNECB is and old code very easy to beat.  Standard design should be 
25% better than the MNECB (due mainly to lighting).  Good HVAC design 
(e.g. condensing boilers, dedicated OA systems and ventilation heat 
recovery) can put you 50 to 60% better than the MNECB.  (My office is in 
a building >75% better than the MNECB, but that is another story).



On 10/10/2011 3:11 PM, Anne M. Moellenberndt wrote:
>
> I'm looking for some feedback from anyone who has used EE4 and/or 
> modeled a building against the MNECB 1997 in Canada.
>
> 1.How are the Energy Source Adjustment Factors used when modeling a 
> building for LEED against the MNECB?  It appears that these factors 
> are meant to be multiplied by the total energy cost from each type of 
> use. I see that at least in LEED Canada NC 1.0/1.1, the calculations 
> for EQ p2 require 25% improvement in energy consumption (not cost) 
> over MNECB. Presumably this requires use of the ESAF in that 
> calculation.  However, LEED also requires that calculations for energy 
> savings are based on energy cost. When calculating energy costs, do 
> you have to use the ESAF as well as the different utility rates? Or do 
> you use the actual consumption (without using the ESAF) to figure the 
> cost?
>
> 2.The code appears to require use of baseline systems that completely 
> mirror the proposed systems -- boiler for boiler, chiller for chiller, 
> multi-zone for multi-zone.  How have others found ways to show 
> significant energy savings given this constraint?  The newer versions 
> of ASHRAE allow comparison of a proposed ground-source heat pump 
> system, for example, against a boiler heating baseline system, or a 
> VAV system against a packaged system, depending on various factors.  
> But the MNECB and ASHRAE 90.1-1999 don't allow this.  I am struggling 
> to see how it would be possible to get more than 20-30% savings given 
> these rules.
>
> Thanks,
>
> *Anne Marie Moellenberndt *PE  LEED AP**
>
> Senior Mechanical Engineer
>
> *Arup*
>
> 403 Columbia Street Suite 220  Seattle WA 98104
>
> *t*+1 206 749 9674 *d* +1 206 493 2244
>
> *f*+1 206 749 0665
>
> www.arup.com <http://www.arup.com/>
>
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