Matthew,
1. A mon avis, (in my opinion) a fan wall has no inherent efficiency advantages beyond a potentially higher fan mechanical efficiency than your current fan. If you currently have a forward curved fan and will convert to an airfoil fan wall, there’s probably a significant boost for mechanical efficiency. My experience says that only rarely does a forward curved fan’s efficiency exceed about 50%. For that matter, BI and AF fans are often not too much better L.
It’s also possible that you may have reduced system effect when converting; that can be a big factor on larger fans so it’s worth checking. I’d model the “fan wall” as a single fan with the actual / manufacturer efficiency and pressure rise.
2. I designed a dual fan / dual duct system long ago and am forgetting some of the details. Nonetheless, the main benefit was that you could use two independent air handlers (1 for hot air, 1 for cold air) and therefore have minimal mixing and maximum turndown for heating and cooling. I have not modeled such in E+, but there are several example files of dual duct systems. You may be able to adapt one for dual fan�
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of matthew.sverre.anderson@xxxxxxxxx
Sent: Wednesday, January 29, 2014 3:31 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Modeling of Fan Wall
Hey everybody,
So this air handler is currently a large dual duct air handler with 2 fans which pressurize a plenum that goes to a hot and cold deck. These decks are not currently separated. One of the VFD's on these fans has failed and we are looking at retrofitting the air handlers with fan walls.
I am trying to do a two part model and am looking for help in this two part process:
1) The first part is just looking at the savings from converting from an old fan to a fan wall. I am assuming that having six smaller fans will allow for a high efficiency and by reducing our electric cost. Is there a template to do this or does anybody have an example?
2) The second part of the model is looking at a long term conversion to a dual duct/dual fan system but I am, again, stuck wondering if there is an easy way to do this or if anybody has actually tried to break up the mixed air between six fans etc...
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