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NC-2009 EAp2:Minimum Energy Performance

CHP - Baseline Case Cost

Profile picture for user simonsiva22
SAMY Chamy
Enginneer
T&T Green
LEEDuser Basic Member
9 thumbs up

Dear Concern:-

Our Project have CHP plant (Natural Gas Generator and VAM Chiller) 

In this case we have (REB) Electricity as Backup 

In this case we have arrived the design case electricity cost as (fuel (Natural gas) cost / Electricity generation) and the cost of per unit of electricity generated via Gas generator is very low compared with  market electricity rate, for example Design case electricity cost - 0.04 USD / kWh (Unit cost = Cost of fuel consumed / Electricity generation) the baseline cost is 0.12 USD / kWh (Market electricity price) but as per CHP guidance baseline case energy cost must be a back up energy or electricity (if no backup) as per our project scenario the backup energy is Electricity only and it is cost is 3 times higher when we compared with cost of generator electricity. 

so now we have clarification in baseline case electrical cost 

  1. can we model the same electricity cost for both base case and design case
  2. can we consider the different cost for Baseline case and design case
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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 04/13/2018 - 15:04

For CHP you include the cost of the natural gas as an energy use in the proposed and the electricity is considered to be free. This assumes that all of the electricity the building uses is from the CHP. If it does not produce all then a portion of the electricity would be at market rate. If it produces more then it must be allocated to other facilities or modeled as a process load in both models. The baseline uses the market rate. 
Profile picture for user simonsiva22
SAMY Chamy
Enginneer
T&T Green
LEEDuser Basic Member
9 thumbs up

Mon, 04/16/2018 - 05:08

Hi marcus your comment is confusing and not clear & i can't able to come to a decision from your reply so please clarify our issue The entire building is using the Electricity from CHP (Gas Generator) if no Gas available or Generator Fault we have used Electricity as backup so please answer for this case The Doubts are 1.Can we model the baseline case with Market electricity rate 2.is there any issue if we model different rates for both case ( CHP electricity rate for Design case & market electricity rate for baseline case)  
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 04/16/2018 - 15:03

1. I clearly stated that you use the market rate for the baseline electricity. 2. Yes there is an issue. You do not use the CHP electric rate at all for any of the calculations. The fuel used by the CHP is gas so the consumption and cost of the gas is included in the proposed modeling results. The electric production is entered as you would an exceptional calculation so the spreadsheet or form will subtract that consumption from the modeling results.

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