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ME 454 s16 exam 3.pdf

ME 454 s16 exam 3.pdf - Ex 3 Na ha A p r il 16 20 1 1 a m m...

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E x a m 3 N a m e M E 4 5 4 H e a t E x c h a n g e r s A p r i l 16 , 2 0 1 ' 1 ( 2 0 p o i n t s ) S e c t i o n 1 1 Cl a s s i f y h e a t e x c h a n g e r s a c c o r di n g t o fl o w t y p e a n d e x p l a i n t h e c h a r a c t e r i s t i c s o f e a c h t y p e ( 3 p o i n t s ) 2 1 n a 1 s h e l l p a s s a n d 6 t u b e p a s s e s s h e ll a n d t u b e h e a t e x c h a n g e r , w h a t i s t h e p r i m a r y r e a s o n f o r u s i n g s o m a n y t u b e p a s s e s ? ( 1 p o i n t ) 3 I s t h e a pp r o x i m a t e i o n h i = h . = h , f o r t h e c o n v e c t i o n h e a t t r a n s f e r c o e f f i c i e n t i n a h e a t e x c h a n g e r r e a s o n a b l e o n e w h e n t h e t h i c k n e s s o f t h e t u b e w a l l i s n e g l i g i bl e ? ¡ poi nt S e c t i o n 2 ( 1 5 p o i n t s ) 1 A 2 s h e ll p a s s e s a n d 4 t u b e p a s s e s h e a t e x c h a n g e r i s u s e d t o h e a t g l y c e r i n f r o m 2 0 ° C t o 50 ° C b y h o t w a t e r , w hi c h e n t e r s t h e t h i n wal l e c m d i a m e t e r t u b e s a t 8 0 ° C a n d l e a v e s a t 4 0 ° C T h e t o t a l l e n g t h o f t h e t u b e s i n t h e h e a t e x c h a n g e r i s 6 0 m T h e c o n v e c t i o n h e a t t r a n s f e r c o e ff i c i e n t i s 2 5 W / m 2 K o n t h e g l y c e r i n ( s h e ll ) s i d e a n d 1 6 0 W / m 2 K o n t h e w a
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