Problem 19-1 - Example 19-1 A roughly spherical potato of...

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Example 19-1 A roughly spherical potato of diameter 3” is placed in an oven at 350 ° F. If the potato is initially at 50 ° F, how long will it take for it to reach 300 ° F? Assume: Btu 0.29 hr ft R k = 2 Btu 2.5 hr ft R h = 3 lbm 52 ft ρ = 3 4 3 sph Vr π = Btu 0.825 lbm °F p c = 2 4 sph A r = Solution: Using the lumped system approximation () ln pf if mc T t T t hA T T ⎛⎞ =− ⎜⎟ ⎝⎠ 3 4 3 mV r ρπ == 3 2 4 3 ln 4 p f rc Tt T t TT hr ln 3 Tt T t hT T
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3 2 lbm 1.5 Btu 52 ft 0.825
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This homework help was uploaded on 04/07/2008 for the course MANE 4010 taught by Professor Kaminski during the Spring '08 term at Rensselaer Polytechnic Institute.

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Problem 19-1 - Example 19-1 A roughly spherical potato of...

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