Fundamentals of Heat and Mass Transfer
Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 1, Problem 1.63P

A 50 mm × 45 mm × 20 mm cell phone chargerhas a surface temperature of T s = 33 ° C when plugged into an electrical wall outlet but not in use. Thesurface of the charger is of emissivity = 0.92 and issubject to a free convection heat transfer coefficientof h = 4 .5 W/m 2 K . The room air and wall temperatures arc T = 22 ° C and T s u r = 20 ° C , respectively. If electricity costs C = $ 0.18 /kW h , determine thedaily cost of leaving the charger plugged in when notin use.
Chapter 1, Problem 1.63P, A 50mm45mm20mm cell phone chargerhas a surface temperature of Ts=33C when plugged into an electrical

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An oven made of stone with 3 m length and semi-cylindrical shape losses heat from inlet section of the surface shell (ri = 50 cm) to outlet section (ro = 62 cm) by convection and radiation. According to the system conditions showing on the following figure; calculate Ti value if To temperature is 35 °C  (Assume steady state and one dimensional condition and ε = 0,90; σ = 5,67x10-8 W/m2K4)
An oven made of stone with 3 m length and semi-cylindrical shape losses heat from inlet section of the surface shell (ri = 50 cm) to outlet section (ro = 62 cm) by convection and radiation. According to the systemconditions showing on the following figure; calculate Ti value if To temperature is 35 °C  (Assume steady state and onedimensional condition and ε = 0,90; σ = 5,67x10-8 W/m2K4)

Chapter 1 Solutions

Fundamentals of Heat and Mass Transfer

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