You have just washed your hair and now blow dry it in a room with 23C,

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You have just washed your hair and now blow dry it in a room with 23°C, ϕ = 60%,
(1). The dryer, 500 W, heats the air to 49°C,
(2), Blows it through your hair where the air becomes saturated
(3), And then flows on to hit a window where it cools to 15°C
(4). Find the relative humidity at state 2, the heat transfer per kilogram of dry air in the dryer, the air flow rate, and the amount of water condensed on the window, if any.
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Fundamentals of Thermodynamics

ISBN: 978-0471152323

6th edition

Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen

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