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Unformatted text preview: S.I. Units Seven basic units Derived units meter radian kilogram steradian second Newton ampere Pascal Kelvin Joule mole Watt candela lumen lux Heat transfer Heat transfer modes due to T difference Conduction conductivity [W/(m K)] Uvalue [W/(m 2 K) ] resistance R [m 2 K/W ] surface film: ext 23 W/m 2 K i.e. R se 0,04 m 2 K/W int 8 W/m 2 K i.e. R si 0,13 m 2 K/W CONDUCTOR HEAT SOURCE HEAT SINK Image by MIT OCW . Heat transfer Heat transfer modes due to T difference Conduction and insulation laws Heat flow = surface x U x T i.e. = surface x (1/R tot ) x T R tot = 1/ ext + R i + 1/ int if resistance in series A tot x R tot1 = (A el1 x R el11 ) if in parallel . U (W/m 2 k) Insulation thickness (cm) 2 4 6 8 10 12 14 16 18 20 22 24 2.5 2 1.5 1 0.5 Int Ext Image s by MIT OCW . Heat transfer Heat transfer modes due to T difference Conduction and insulation laws: resistances in series...
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This note was uploaded on 12/11/2009 for the course ARCHITECTU 4.401 taught by Professor Marilyneandersen during the Spring '06 term at MIT.
 Spring '06
 MarilyneAndersen

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