SYMBOLS-REFRIGERATION AND

AIR CONDITIONING

Symbols in refrigeration make the study simpler and easy. Standard symbols saves lot of time too. These help to increase the understanding deep and clear.

A	Area	m 2
C	Concentration of Low boiling component	No units
D	Diameter	m
G	Mass flux is Rate of mass flow per unit area	Kg/s m 2
h	Specific enthalpy	k J/kg
H	Total enthalpy = m h	k J
L	Length	m
M	Molecular weight	g
M	Mass	kg
m.	Mass flow rate	kg/s
N	Number	No units
N	Cooling effect OR refrigerating effect	k J/kg
N	Cooling capacity or refrigerating capacity	k J/min or TR
n	Polytrophic index of compression Or expansion	No units
P	Pressure	bar
Q.	Rate of heat transfer	J/s or W
Q L.	Rate of Latent heat transfer	W
Q s.	Rate of Sensible heat transfer	W
R	Universal constant	k J/K h
R g	Individual Gas constant= R/M	k J/kg K h
s	Specific entropy	k J/kg K
S	Total entropy	k J/K
T	Absolute temperature	K
t	temperature	0 C
u	Specific internal energy	k J/kg
U	Total internal energy= m u	k J
v	Specific volume	m 3/kg
V	Total volume -m v	m 3
w	specific work or Work input per kg	k J/kg
w	Specific humidity	g/kg of dry air
W	Work input per minute	k J/min
x	Liquid phase mass concentration	No units
X	Dryness fraction	No units
y	Vapor phase mass concentration	No units
γ	Adiabatic index of compression	No units
γ	Adiabatic index of expansion	No units
µ	Joule Thomson Coefficient	0 C/bar
Η	Efficiency	No units
ρ	Density	kg/m 3
BP	By pass factor	No units
CF	Contact factor	No units
COP	Coefficient of performance	No units
S H L	Sensible heat load	W
L H L	Latent heat load	W
R L H L	Room latent heat load	W
E R S H L	Effective room sensible heat load	W
E R S H L	Effective room latent heat load	W
G S H L	Grand sensible heat load	W
G L H L	Grand latent heat load	W
G S H F	Grand sensible heat factor	No units
E R S H F	Effective room sensible heat factor	No units
R S H F	Room sensible heat factor	No units
TR	Ton of refrigeration	TR
O D C	Outside design conditions	0 C
I D C	Inside design conditions	0 C
ADP	Apparatus dew point	0 C
D B T	Dry bulb temperature	0 C
W B T	Wet bulb temperature	0 C
DPT	Dew point temperature	0 C

SUFFIXES

L, l                   liquid

V, v                  vapor

fg                     latent

IMPORTANT IN REFRIGERATION

 

 

https://www.mesubjects.net/wp-admin/post.php?post=7875&action=edit        Psychrometric Properties

https://mesubjects.net/wp-admin/post.php?post=6047&action=edit                     THEORY COOLING LOAD CALCULATIONS

https://www.mesubjects.net/wp-admin/post.php?post=6052&action=edit       SHF

https://mesubjects.net/wp-admin/post.php?post=4095&action=edit                   Q.A. VC Refrigeration