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Unformatted text preview: ME 324 HW #2 07.03.2011 1. Steam at 320ºC flows in a case iron pipe ( k = 80 W/m ºC) whose inner and outer diameters are 5 cm and 5.5 cm, respectively. The pipe is covered with 3cmthick glass wool insulation with k = 0.05 W/m ºC. Heat is lost to the surroundings at 5ºC by natural convection and radiation, with a combined heat transfer coefficient of h = 18 W/m 2 K. Taking the heat transfer coefficient inside the pipe to be h = 60 W/m 2 K, determine (1) the rate of heat loss from the steam per unit length of the pipe, and (2) the temperature drop across the insulation. insulation T ∞,o r 2 T ∞,i r 1 r 3 m 025 . 1 r m 0275 . 2 r m 0575 . 3 r Let L = 1 m. Then 2 1 m 157 . ) 1 )( 025 . ( 2 2 L r A i 2 3 m 361 . ) 1 )( 0575 . ( 2 2 L r A o K/W 61 . 2 154 . 35 . 2 0002 . 106 . ) 361 . )( 18 ( 1 ) 1 )( 05 . ( 2 ) 0275 . / 0575 . ln( ) 1 )( 80 ( 2 ) 025 . / 0275 . ln( ) 157 . )( 60 ( 1 1 2 ) / ln( 2 ) / ln( 1 2 3 1 2 ...
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This note was uploaded on 10/05/2011 for the course ME me352 taught by Professor Koraykadirsafak during the Spring '11 term at Yeditepe Üniversitesi.
 Spring '11
 koraykadirsafak
 Insulation

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