Valve Throttling Its Influence On Compressor Efficiency and Gas PDF

 

Purdue University 

Purdue e-Pubs Internationall Compres Internationa Compressor sor Engineering Conference

School of Mechanical Engineering

1992

 Valve roling, Its Inuence  Valve Inuence on Compressor Compressor Efciency and Gas Temperatures, Part I E. H. Machu Hoerbiger Ventilwerke A.G.; Austria

Follow this and additional works at: hp://docs.lib.purdue.edu/icec  International ional Machu, E. H., "Valve roling, Its Inuence on Compressor Eciency and Gas Temperatures, Part I" (1992).  Internat Compressor Engineering Conference. Paper 805. hp://docs.lib.purdue.edu/icec/805

is document has been made available through Purdue e-Pubs, a service ser vice of the Purdue University Libraries. Please contact [email protected] for additional information. Complete proceedings may be acquired in print and on CD-ROM directly from the Ray W. Herrick Laboratories at hps://engineering.purdue.edu/ Herrick/Events/orderlit.html

 

6.1 

T e m p e r a t u r e  r i s e   d u e   t o   t h e   s u c t i o n   w

o r k   loss 

L e t   [} .p ;  .w   b e   t h e   m e a n   e f fe c ti v e   pr e s s u r e o f  t h e s u c t i o n   w or k   lo so so  i n   t h e  i n d i c a t o r  d i a g r a m   r e f e r ri n g  t o   t h e   f u ll ' ll  'll e n g t h   o f  th  t h e   i n d i c a t o r d ia g r a m   (i .e .   .1 p ;  s v   =   w i th   g a s d e n o it y   / 1  1  in   t h e s u c ti o n   p l e n u m  a n d   c o n s t a n t   v o lu m e B ow   r a t e   = 

V 

; . ;   · 

(6 .2 )  (s e e  (11] 11]  o r   (12 (12],  c h a p t e r  2)  th e n   t h e  a u c t io n

o f  T 1 , is is   g iv e n   by  

 w o rk  lo15,  w i th  s u c t io n  p l e n u m  t e m p e r a t u r e

T  .1  W   =   v  . 1 p ;   s v   - T  

(6 .3 ) 

A p p ly i n g   e q u a ti o n   6 .1   to   th e   s u c t io n  s tr o k

s u b s t i t u t i n g  f r o m   eq u a t i o n s   2. 5   a n d   6 . 3  i n  

e   t h e   t e m p e r a t u r e   r is e   fro m   T  q l t o   T w   6 . 1 .   W e  o b t a i n  

vR   pT  

1    < 1 p ; sv   TT

w  .

·pl 

or 

,. C  .  R ----= ---=--1  T w  •  - T .  

  A 

1 

 T,pl  i n s t e a d  

J 

is o b t a i n e d   b y

(6 .4 ) 

(6 .5 )  F o r a b b r e v i a t i o n ,  w e i n t r o d u c e  a c o n s t a n t  C , 

c  •  -

l _  .  

. 1 p ; sv   .

T. .

PI  

s u c h t h a t   e q u a t i o n   6 . 5  c a n   b e   wr i t te n  i n   t h e  f o

A 

r m  C  

. 

(6 .6 ) 

I<  

= 1  - ;{;f. 

a n d   w e  fin a lly ll y   ge t  

or  T h e  t o t a l.  t e m p e r a t u r e  i n c r e u e  d u r i n g  ..ii n t a