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Published byLawson Hills Modified about 1 year ago

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Chris Mullen Etay Orlander

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Hand dryers much more environmentally friendly than paper towels People get frustrated with length of time to dry hands Compared the effectiveness of different models Older warm-air dryers Newer energy efficient models

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Dryers modeled as compressors Steady state, with control volume, standard assumptions (pressure at one bar, no stray heat transfer) Air as an ideal gas Ideal gas law Set amount of energy to evaporate a set amount of water Assumed 5 mL initially on hands

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Measured dimensions of output nozzle Measured ambient temperature Measured output velocity, temperature Mass flow rate calculated from area and velocity Power out calculated from mass flow rate and h values from tables Gathered Manufacture information from Internet

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Xlerator XL-SB Toto Clean-Dry World Dryer NR-126 World Dryer RA-5

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ModelAir Speed Calculated Output Power Stated Input Power EfficiencyNozzle Area Time to Dry 5 mL of Water Toto Clean-Dry HDR100#GY 18.5 m/s.1006 KW.510 KW19.73% sec World Dryer, RA m/s.978 KW2.3 KW42.54%13.11 sec World Dryer, NR m/s1.279 KW2.0 KW63.96%10.03 sec Xlerator, XL-SB96.5 m/s *1.125 KW1.5 KW75.0%11.40 sec

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All models had comparable output power Variable efficiency Newer models generally more efficient/effective Positive correlation between area of nozzle and effectiveness Main dryer disadvantage is they are less hygienic than paper towels

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And…..Family Guy! And…..Family Guy

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