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The energy cost offset from onsite renewable energy cannot be used to demonstrate compliance with the prerequisite. Can this cost offset still be credited to the proposed energy cost savings for this credit?

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NC-v4 EAc2:Optimize energy performance

Thermal storage and Optimize Energy Performance

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Stephan Zweig
Civil Engineer
BLPTK Construction
LEEDuser Basic Member
3 thumbs up

Hell to all LEED users,

We are examininig to implement in out project a ice thermal storage systems.

The charges during the the night are better than during the day.

And by implemeting the TES system we will need smaller chillers.

How could these facts contribute to the Optimize Energy Perforamnce Credit?

When implementing a TES system in the proposed buiding, are there any instructions in ASHRAE how we would treat the baseline building?

Thank you

 

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Tue, 07/23/2019 - 15:17

LEED energy credits are based on total energy COST, not total energy usage.  Meaning utilizing a cheaper utility, or shifting usage according to a rate structure to pay less for energy, is advantageous.  I can assign a scheduled rate structure in Trace simulation software to assign a cost to each unit energy used at different dates and times, and it tallies it all up to arrive at the total energy cost.

The same rate structure must be used for baseline and proposed, but the baseline system is only what is assigned in 90.1 (which does not require TES to shift usage to non-peak hours) and does not change because you have chosen to implement TES in your proposed.

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