refrigeration formulas
DESCRIPTION
wTRANSCRIPT
REFRIGERATION FORMULAS
Enthalpy of Enthalpy of
Net refrigerating � vapor leaving � liquid entering
effect (BTU/lb.) evaporator (BTU/lb.) evaporator (BTU/lb.)
Compression work � Heat of compression � Refrigerant circulated
(BTU min.) (BTU/lb.) (lb./min.)
Compression HP � Compression work (BTU/min.)/42.4
Compression HP � Capacity (BTU/min.)/42.4 � COP
Compression HP � 4.715/COP
(per ton)
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580G
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1
Power (Watts) � Compression HP per ton � 745.7
COP �Net refrigerating effect (BTU/lb.)
Heat of compression (BTU/lb.)
REFRIGERATION FORMULAS (cont.)
Capacity (BTU/min.) � Refrigerant circulated � Net refrigerating
(lb./min.) effect (BTU/lb.)
Compressor displacement �(ft.3/min.)
�Enthalpy of Enthalpy of
Heat of compression vapor leaving � vapor entering
(BTU/lb.) compressor (BTU/lb.) compressor (BTU/lb.)
(BTU/min.)
Net refrigerating effect (BTU/lb.)
Volume of gas entering
compressor (ft.3/lb.)�Capacity
GR
BQ
121-2
580G
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-64].q
xd 9
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6 4
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M P
age 1
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Volumetric efficiency � 100 �
Compression ratio �
Refrigerant circulated, �lb.(min.)(ton)
42.4 � heat flow, BTU/(min.) (hp); 200 � BTU/(min.) (ton); COP � coefficient of performance
200
Refrigerating effect
Head pressure, psia (absolute)
Suction pressure, psia (absolute)
bActual weight of refrigerant
Theoretical weight of refrigeranta
REFRIGERATION FORMULAS (cont.)
GR
BQ
121-2
580G
-C01[1
-64].q
xd 9
/15/0
6 4
:22 P
M P
age 1
-11 T
ech B
ooks-A
rts:GR
BQ