Actual HVAC Heat Load Calculations Vs Heat Load Calculations as per LEED

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For LEED Energy Modeling generally we consider software of DOE, EQUEST,
TRANE, HAP etc..

To design a Heat load calculations for HVAC generally considered the exact
load in the Building and to comply for LEED Requirements of EAC1 - Optimized
Energy Performance we need to consider 25% of Process Load cost which is
much less.

Cooling load will be different when we compare between Actual Heat Load and
the Heat Load as per LEED. I hope I'm correct.

I received a comment from LEED Reviewer, that "Proposed model should reflect
all the HVAC equipment in the actual design at actual component capacities"

Please guide me how to model in Propose Design.

Thanks & Regards,


ashraf khan's picture
Joined: 2011-10-02
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There have been several discussions on this topic before so you might do
a quick search if you need more in-depth background information. The 25%
is actually more of a guidance number and is what is typically expected
for an office building here in the US. There is nothing in LEED that
states you can't be less than 25% - you just have to document why and
submit it along with the EAc1 template. The 25% is also a suggested
minimum number - not a maximum. Long story short - you should model your
building as it will be operating - this includes the process loads. If
you building has greater than 25% process load then you don't need to do
anything else. If it is less then you will need to submit additional

Seth Spangler, LEED(r) AP

Tiger06's picture
Joined: 2011-02-14
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