Lecture 7 Combined Thermal Resistances

Lecture 7 Combined Thermal Resistances - Thermal and Fluids...

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Lecture 7 – Combined Thermal Resistances Radiation and Convection Consider a surface cooled by both radiation and convection: rad conv QQ Q =+ ±± ± s f ss u r r rad conv TT Q RR ± where T s is the surface temperature of the plate. The resistance network for this situation is Lecture 7 Page 1
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Consider the special case in which the fluid and the surroundings are at the same temperature, T ss rad conv TT TT Q RR ∞∞ −− =+ ± () 11 s rad conv QT T ⎛⎞ ⎜⎟ ⎝⎠ ± s tot TT Q R = ± Therefore 11 1 tot rad conv R 1 conv rad tot rad conv rad conv R rad conv tot rad conv R = + Since tot rad conv RR R Lecture 7 Page 2
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski tot rad conv hA h A h A =+ tot rad conv hh h Radiation is important for: - moderate temperatures with natural convection of gases - high temperatures with forced or natural convection of
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This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lecture 7 Combined Thermal Resistances - Thermal and Fluids...

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