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VAV: Fan powered box or no fan duct

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The fan powered box has advantage to reduce reheat energy but added more fan energy, especially series fan powered box. From simulation, I often see negative effect using fan powered box compared to single ducted box with reheat.

I wonder if anyone has different results/opinion on this. I really dont see the real advantage of fan powered box.

Thanks!

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wangh

asked 2015-03-20 13:27:11 -0500

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__AmirRoth__

updated 2016-01-09 13:51:27 -0500

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I typically see fan-powered boxes serving perimeter zones to augment higher heating/cooling loads. Using a series terminal unit allows you to reduce the amount of static on your central AHU (0.2" w.g. instead of 0.5" w.g.).

Here's some literature from Titus that summarizes their advantages