Transcription of HEAT TRANSFER EQUATION SHEET - UTRGV
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HEAT TRANSFER EQUATION SHEET - UTRGV
1 HEAT TRANSFER EQUATION SHEET Heat Conduction Rate equations (Fourier's Law) Heat Flux : = 2 k : Thermal Conductivity Heat Rate : = Ac : Cross-Sectional Area Heat Convection Rate equations (Newton's Law of Cooling) Heat Flux: = ( ) 2 h : Convection Heat TRANSFER Coefficient 2 Heat Rate: = ( ) As : Surface Area 2 Heat Radiation emitted ideally by a blackbody surface has a surface emissive power: = 4 2 Heat Flux emitted : = 4 2 where is the emissivity with range of 0 1 and = 10 8 2 4 is the Stefan-Boltzmann constant Irradiation: = but we assume small body in a large enclosure with = so that = 4 Net Radiation heat flux from surface: = = ( ) = ( 4 4) Net radiation heat exchange rate: = ( 4 4) where for a real surface 0 1 This can ALSO be expressed as.
726 Chapter 11 Heat Exchangers 01 2 3 4 5 NTU ε 1.0 0.8 0.6 0.4 0.2 0 1.00 C m in / C m a x a = 0.25 0 = 0.75 0.50 T h,o or T c,o T c,i or T h,i T c,o or T h,o T h,i ...
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