[Bldg-sim] LEED Kitchen/Laundry HVAC Systems

[Fred Betz]

HVAC energy consumption caused by process loads cannot be called process loads. Nor would you want it to be a process load, because then you can't take credit for savings or at least not as easily.

Correct, your electrical or IT room with 90kW baseline is a system 3, and your Proposed can be an efficient design. ASHRAE 90.1-2007 G3.1.1 exception b allows you to apply system 3 for zones with large process loads.

This can be a huge source of energy savings. Enjoy it now, because rumor has it that the next version of 90.1 will set an alternate baseline for IT rooms and the like, and system 3 will no longer be applicable because the energy savings can be ridiculously large.



Fred Betz  PhD., LEED AP
Sustainable Systems Analyst



AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
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From: Rob Hudson [mailto:rdh4176 at gmail.com]
Sent: Thursday, October 27, 2011 12:54 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] LEED Kitchen/Laundry HVAC Systems

In the situation that a design is utilizing an efficient exhaust/make up air system, the LEED book says that an exceptional calculation may be used to help quantify savings.  This leads me to believe that the kitchen cooking equipment is process, but the HVAC equipment is not.  My office has been having a "discussion" about whether HVAC equipment that conditions air for process equipment is considered process as well.

Another example that is plaguing me:  an electrical rack room has 90 kW of stuff and requires 25 tons of cooling.  If i use an efficient design, can i take credit for it by comparing my design to a baseline of system 3 (PTAC w/ DX cooling and furnace heating)?  I believe that this HVAC system should be allowed to get credit, but others argue that because it serves process equipment, then it is "process" heating/cooling.

Any thoughts from LEED AP out there? (i'm still working on getting my LEED AP).

Thanks,

--
Rob Hudson
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