ASHRAE 90.1 2007 - Evaporative humidifier/ cooler

Ricardo Marques

LEEDuser Basic Member

2 thumbs up

March 5, 2012

Dears Sirs, In ASHRAE 90.1 2007 APPENDIX G, in baseline simulation, when I should use evaporative humidifier/cooler? Many Thanks Ricardo

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 03/05/2012 - 23:06

Almost never in an NC project. Only exception that comes to mind is if the system was strictly for process and not people. Not even sure that ever happens.

Evelyn Dicks, EI, CxA

Mechanical Engineer

Moses and Associates

LEEDuser Basic Member

48 thumbs up

Tue, 03/06/2012 - 13:38

Marcus, what are the requirements when a HVAC is designed strictly for process and not for occupancy? I have not seen this in Appendix G or LEED NC reference guide....where is this specified? Thanks.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 03/06/2012 - 14:24

It is not in those documents because it is not regulated by 90.1. As with any process load it is modeled identically in the baseline and proposed. An example would be a chiller whose chilled water is piped directly to cool a process load like a data center, some hospital equipment, ice rink, etc.

Ricardo Marques

LEEDuser Basic Member

2 thumbs up

Tue, 03/06/2012 - 14:40

Marcus, My building is a data center, only a data center. Don’t have other spaces. How should simulate it based in ASHRAE 90.1 2007 for LEED? Many Thjanks

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 03/06/2012 - 15:24

The building is simulated like any other building and the data center is considered a process load and should be identical in both models. If you are claiming savings relative to the process loads you must follow the exceptional calculation method. Data centers are being included in the next version of LEED. The second round of public comment documents contained some guidance on data centers as I recall. http://www.usgbc.org/DisplayPage.aspx?CMSPageID=2360