Maurice Tutor

(5)

$15/per page/Negotiable

About Maurice Tutor

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 399 Weeks Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 21 Mar 2018 My Price 7.00

cost of leaving

1.63    A 50 mm X 45 mm X 20 mm cell phone  charger has a surface temperature of Ts = 33°C when plugged into an electrical wall outlet but not in use. The surface of the charger is of emissivity s = 0.92 and is subject to a free convection heat transfer coefficient of h = 4.5 W/m2 · K. The room air and wall tempera- tures are  T00  = 22°C  and  Tsur  = 20°C, respectively. If electricity costs C = $0.18/kW · h, determine the

daily cost of leaving the charger plugged in when not in use.

ri = 0.5 m

 

 

(a)    Assuming negligible temperature gradients in the canister wall and a constant heat flux qi", develop an equation that governs the variation of the wall tem- perature with time during the transient process. What is the initial rate of change of the wall tem- perature if q"i = 105 W/m2?

(b)   What is the steady-state temperature of the wall?

(c)    The convection coefficient depends on the velocity associated with fluid flow over the canister and whether the wall temperature is large enough to induce boiling in the liquid. Compute and plot the steady-state temperature as a function of h for the range 100 h 10,000 W/m2 · K. Is there a value of h below which operation would be unacceptable?

Answers

Maurice Tutor
(5)
Status NEW Posted 21 Mar 2018 04:03 AM My Price 7.00

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