Did Panasonic Make a Contractor-Proof Bath Fan?

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Presentation transcript:

Did Panasonic Make a Contractor-Proof Bath Fan? Ben Hannas -- ben@hannasanalytics.com Jonathan Coulter -- jcoulter@advancedenergy.org Bruce Manclark -- brucemanclark@gorge.net Data, Not Dogma - July 18-19, 2011 - Goldendale, WA Measuring Air Flow, Energy Use, and Static Pressure in a Variety of As-Installed Conditions

The Test Setup

Panasonic Whisper Green Fan Controls Dial-in CFM Timer not visible to homeowner

Metering

Variables Duct type (metal flex, sheet metal) Elbow placement (immediate, 2-3’) Flap (open, screwed shut) Termination (forced passive, duct roof vent) Grille (with, without) Installation type (perfect, small oops, they probably won’t catch this mistake)

Baseline and Ideal Baseline Ideal No duct, open flap, with grille 136 CFM, 1.5 Pa, 10 Watt Ideal 2 feet straight before elbow, 5 feet up to roof duct vent termination 143 CFM, 45 Pa, 19.8 Watt

Duct Type No change between metal flex and sheet metal in ideal setup 141 CFM, 22-24 Pa, 15 Watt

Changing the Termination Passive attic vent used as duct termination Shove it in and seal it 142 CFM, 22.2 Pa, 14.8 Watt Duct roof vent Meets code 143 CFM, 45.0 Pa, 19.8 Watt As a note, running fan 24/7 at this rate is <$20/year

Real-world Duct Run We have a ladder and a phantom truss in the way! CFM increased slightly (5 CFM) Static pressure doubled to 46 Pa Energy increased slightly, up to 21 Watt

Damper With the same realistically awkward duct run, now tape the damper shut (but that never happens in real life) CFM dropped almost in half, but still pulled 87 CFM Static pressure jumped from 46 Pa to 128 Pa Watts increased slightly, from 21 to 23 Watts

Calibrated Crush The “small oops” scenario Damper open, but complex duct run No change in CFM Static increases from 46 Pa to 60 Pa Watts increase from 21 to 24

Maybe They Won’t Notice

Maybe They Won’t Notice Still pulled 57 CFM 140 Pa Only 20 Watt