A hair dryer is basically a duct in which a few layers of electrical resistors are placed. A small fan pulls in air and forces it to flow across the resistors, where it is heated. Air enters a hair dryer with 900 W power at 100 kPa and 25 °C and exits at 50°C. A cross-sectional area at the hair dryer outlet is 60 cm2. Ignoring the power consumed by the fan and how heat losses through the dryer walls, determine (a) the volumetric flow of air at the inlet and (b) the velocity of the ai
A hair dryer is basically a duct in which a few layers of electrical resistors are placed. A small fan pulls in air and forces it to flow across the resistors, where it is heated. Air enters a hair dryer with 900 W power at 100 kPa and 25 °C and exits at 50°C. A cross-sectional area at the hair dryer outlet is 60 cm2. Ignoring the power consumed by the fan and how heat losses through the dryer walls, determine (a) the volumetric flow of air at the inlet and (b) the velocity of the ai
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A hair dryer is basically a duct in which a few layers of electrical resistors are placed. A small fan pulls in air and forces it to flow across the resistors, where it is heated. Air enters a hair dryer with 900 W power at 100 kPa and 25 °C and exits at 50°C. A cross-sectional area at the hair dryer outlet is 60 cm2. Ignoring the power consumed by the fan and how heat losses through the dryer walls, determine
(a) the volumetric flow of air at the inlet and
(b) the velocity of the air at the outlet.
Answers: (a) 0.0306 m3/s, (b) 5.52 m/s
Transcribed Image Text:T = 50 °C
P, = 100 kPa
T = 25 °C
Az = 60 cm?
W = 900 W
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