[Bldg-sim] ASHRAE App G VAV Fan Curve

Porter, Fred AEC FPorter at archenergy.com
Wed Feb 26 09:40:23 PST 2014


All,
Does anyone know, particularly through having claims accepted by GBCI, whether the ASHRAE App G VAV fan curve is supposed to represent a fan system with or without static pressure reset. I always thought it was supposed to represent a system with sp reset, conforming to 6.5.3.2.3. However, most of the curve power values are even higher than curves representing VAV/VFD systems without sp reset. A confusing aspect is that compared to other VFD fan curves, the power values are high at high flows, but low at low flows, even going to zero at zero flow, though that is really meaningless.

As an aside, the 2013 Title 24 ACM now defines fan curves for central VAV systems with and without sp reset, taken from Taylor's VAV design guide. SP reset is the "baseline" or "standard."A

Thanks for any experience or thoughts on this.

Fred
Fred Porter, BEMP, LEED(c) AP
Senior Energy Analyst
Architectural Energy Corporation
A Member of NORESCO Energy and Sustainability Services
2540 Frontier Ave, Suite 100, Boulder, CO  80301
Phone 303.459.7425 |  fporter at archenergy.com<mailto:fporter at archenergy.com>
www.archenergy.com<http://www.archenergy.com>


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