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4) Circulation amount of refrigerant : An amount of refrigerant to be evaporated in evaporator to obtain the
refrigerating capacity needed. It is expressed in the weight by the unit time.
Q ............................................................................................................................................. (7.6)
G =
q
e
G: Circulation amount of refrigerant (kg/h)
Q: Refrigerating capacity needed (Kcal/h)
qe: Refrigerating effect by the refrigerant 1kg (Kcal/kg)
To decide the capacity of compressor, the circulation amount of refrigerant should be converted into the suction
gas amount of compressor.
Q
V = G
=
vA
q
e
V: Suction gas amount of compressor (m
V
: Specific volume of refrigerant at compressor inlet (m
A
The amount of piston extrusion is calculated as follows.
π
2
L X 60nL ............................................................................................................................................. (7.8)
V' =
D
4
D: Diameter of cylinder (m)
n: Rotational speed of compressor (rpm)
L: Piston stroke (m)
N: No. of cylinder
5) Coefficient of performance : The efficiency of refrigerating cycle. It is expressed in COP as the abbreviation
of Coefficient of Performance.
COP
COP
Al : Heat equivalent of work for compression (Kcal/kg)
qe : Refrigerating effect (Kcal/kg)
COP is greater than 1, and the greater COP is, the better the performance is.
For the general COP of refrigerator, compressive efficiency
h
h
COP'= COP x
x
c
TCL Air Conditioner Service Manual
Q
vA
3
/ h ) .......................................................................................................... (7.7)
=
(m
vA
i
- i
A
D
/h)
3
Refrigerating effect
=
Heat equivalent of work
q
e
=
=
Al
............................................................................................................................(7.10)
m
/kg)
3
¡
Shaft power for compressor(KW) x 860
-i
i
A
D
...................................................................................(7.9)
i
-i
B
A
h
and machine efficiency
c
13
Refrigerating effect
h
should be considered.
m
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