Answered: he fan circulates the warm air on the…

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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Question

The fan circulates the warm air on the inside of the windshield to stop condensation of water vapor and allow for maximum visibility during wintertime (see images).
You have been provided with some info. and are asked to pick from the bottom table, the right model number(s) that will satisfy the requirement.
Your car is equipped with a fan blower setting that allow you to choose between speeds 0, 1, 2 and 3.
Variation of the convection heat transfer coefficient is dependent upon multiple factors, including the size and the
blower configuration.
following image shows the parameters

Glass length (L) 800 [mm]
Glass thickness (t) 6 [mm]
Vehicle velocity (v) 70 (kph]
Vair 12.5 x 10 (m?/s]
Prair 0.71 (-)
Tdp- min. inner glass 10 ["C]
temperature
Ambient air (Tm,o) -15 ("C]
Temp. of blowed air (T) 50 ["C]
Nuxlam 0.332 Re,2 Pr/3
Nuturb 0.0296 Re,0.8 Pr/3
kair 0.023 (W/m.K]
kglass 1.4 (W/m.K)
Blower specs table:
hbar, i [W/m?.K]
0- 32
Model No. Speed range (m/s]
[0, 3, 5, 6]
(0, 2.5, 4, 5]
(0, 2, 3, 4]
Manufacturer
A
SPDY-3000
В
REL-103
0- 26
ACDELC-177
0- 24
Source: Cleamecanic
Source: Incropera
fan
heaner bower motor

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