• Author / Uploaded
• Frederico Ribeiro

• Categories
• Intercambiador de calor
• Dinámica de fluidos
• Transferencia de calor
• Calor
• Mecánica de Medios Continuos

Citation preview

M e an T e m p e ra tu re D ifferen ce in D esign By R. A. BOWMAN,1 A. C. M UELLER ,2 a n d W. M. NAGLE3 In h e a t-tr a n s f e r a p p a r a tu s t h e r a te o f h e a t flo w f r o m t h e h o t t o t h e c o ld flu id i s p r o p o r tio n a l t o t h e t e m p e r a t u r e d iffer en c e b e tw e e n t h e tw o . F o r d e s i g n p u r p o s e s , i t is n ec es sa ry t o b e a b le t o d e t e r m in e t h e m e a n d iffe r e n c e in te m p e r a tu r e fr o m t h e in le t a n d e x it te m p e r a t u r e s . N u m er o u s in v e s t ig a t o r s h a v e c o n tr ib u t e d a n a ly s e s o f t h e t e m p er a tu re d iffer e n c e fo r e x c h a n g e r s w it h n e it h e r c o u n te r n o r c o c u r r e n t flow . T h is p a p er c o o r d in a te s th e r e s u l ts o f p r e v io u s s t u d ie s o n t h e s a m e b a s is t o g iv e a s c o m p le t e a p ic tu r e a s p o s s ib le o f a l l t h e v a r io u s a r r a n g e m e n t s o f su rfa c e a n d flo w . S h e l l- a n d - t u b e e x c h a n g e r s w i t h a n y n u m b e r o f p a s s e s o n s h e ll s id e a n d t u b e s id e a r e co v ere d a s a r e t h e c ro ssflo w e x ch a n g e r s w i th d iffe r e n t p a s s a r r a n g e m e n t s a n d w i t h m ix e d a n d u n m ix e d flo w . T h e sp ec ia l c a s e s o f t r o m b o n e c o o le r s , p o t c o o le r s , a n d b a t c h p r o c es s e s , n o t p r e v io u sly p u b lis h e d , ar e a ls o tr e a te d i n d e t a il. Nomencl a t ur e

TH E following nomenclature is used in the paper: A — area of heating surface C = specific heat of shell-side (or hot) fluid c = specific heat of tube-side (or cold) fluid e = base of natural logarithms F = correction factor, dimensionless M = weight of fluid batch N = number of shell-side passes P = (tj —