[Bldg-sim] Innovation-In-Design credit for Peak Demand Reduction NOT demand response

[Bishop, Bill]

Debra,

 

My first reaction is that if you break out the demand charges from the utility rates you use for Connecticut you are going to reward any demand reduction with EAc1 energy cost savings, negating the need or justification for an ID point.

 

Regarding how to calculate peak demand savings - assuming you are doing an energy model for the building, and you are modeling the peak-reduction measures, the model will provide results for monthly peak demand reduction. I don’t think average hourly demand reduction and average monthly peak demand values are appropriate when looking at demand savings. It would be more appropriate to compare 12 monthly peak values for the baseline and 12 (lower) peak values for the proposed design that coincide with the same 15 minute period of the month as each of the 12 monthly peaks of the baseline. It could be tricky to determine exactly when these 15 minute periods should occur if you are not modeling the measures. A good guestimate for summer months would be to take the peak demand periods for each month provided by your model (without the demand-saving measures) and subtract the PV output and daylighting savings contributions at that time of day for full sunlight. I suggest reviewing the LEED guidelines for CHP to determine how to get credit for it, but that is also already covered and I doubt it falls into ID credit territory.

 

Regards,

Bill

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of dlombard at earthlink.net
Sent: Tuesday, September 06, 2011 3:46 PM
To: bldg-sim at lists.onebuilding.org
Cc: debra lombard
Subject: [Bldg-sim] Innovation-In-Design credit for Peak Demand Reduction NOT demand response

 

			Hi Everyone,
			
			I am working on a LEED-NC v2.2 project which is small but has three technologies that reduce peak demand which is critical here in Connecticut.
			
			My question is how to calculate that % reduction in peak demand to go for an Innovation-In-Design credit for Peak Demand Reduction NOT demand response as seen in Pilot Credit 8.
			
			We feel that the Calculation should be as follows:

			Calculations:              

			Total average hourly electricity demand reduction  (TAHEDR) of building

			OVER

			Avg. Monthly peak demand of the building WITHOUT the MCHP, PV, or Daylighting 

			AND

			 the energy use reduction of the building from the energy model

			OVER

			the total energy use of the building WITHOUT the MCHP, PV, or Daylighting.

			The focus of this credit is to show how much energy is being offset by the sustainable power systems and how they are the reducing burden of the utility in terms of pollution reductions. (lbs/CO2, NOx, SOx, etc.).
			
			Anyone feel otherwise or agree? Please let me know.
			
			Thank you very much!
			Debra Lombard, LEED AP, EMIT, EIT
			dlombard at earthlink.net

		 

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