System type for process heat exchanger

David Weigel, PE

Managing Member

The Watt Doctors, LLC

LEEDuser Basic Member

10 thumbs up

August 27, 2012

Hi Group, I searched posts and couldn't find anything like this that has already been answered. I have a proposed 2000+ ton chilled water system in a building, which will be modeled as system 7 in the baseline. There are a lot of spaces that meet the system type exception in G3.1.1b (process loads). So, for those areas in the baseline I can select system 3 (packaged single-zone DX with fossil fuel furnace). Here's my question: One of the process loads in the building is for process cooling water that is fed from the central chilled water plant via a heat exchanger (about 200 tons). Can this load also be modeled with system 3 in the baseline, or doe it have to be included in the chilled water system as a secondary loop? It's not really a space, so I am unsure. Thanks tons! Dave

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 08/27/2012 - 19:04

Since system 3 is a DX system I am not sure how that would even work? Process chilled water, since it is for process and not space conditioning, is modeled identically in both the baseline and proposed.

David Weigel, PE

Managing Member

The Watt Doctors, LLC

LEEDuser Basic Member

10 thumbs up

Mon, 08/27/2012 - 19:44

Thank you Marcus. If it were allowed, I was considering adding the process chilled water load to the space that the machine sits in, as a process heat load, then applying the DX system to the load. Perhaps that was not the best thinking on my part. You've made it moot anyway. I appreciate it!