Answered: An engine cover is made from 1 cm thick…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.10P: 3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the...

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Solve for this : An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to?

Expert Solution

Step 1

Given data as per the question

Temperature of air in cylinder =340⁰ c

heat transfer coefficient = 7 W/m²K

Ambient temperature = 70°C

$\begin{array}{l} heat flux through the circuit \\ Q' = \frac{T_{\infty i} - T_{\infty o}}{(R_{c o n v}) + (R_{c o n d}) + {(R_{c o n v})}_{o}} \\ = \frac{T_{\infty i} - T_{\infty o}}{\frac{1}{h} + \frac{x}{k} + \frac{1}{h}} \\ = \frac{340 - 70}{\frac{1}{7} + \frac{0.01}{14} + \frac{1}{7}} \\ = 942.6433 \frac{w}{m^{2}} \end{array}$

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