TCL AC-07CK, Руководство по обслуживанию, Страница: 69 / 138

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.
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.
V: Suction gas amount of compressor (m
3
/h)
V
A
: Specific volume of refrigerant at compressor inlet (m
3
/kg)
The amount of piston extrusion is calculated as follows.
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.
G =
Q ............................................................................................................................................. (7.6)
q
e
COP =
Refrigerating effect
¡
Refrigerating effect
Heat equivalent of work Shaft power for compressor(KW) x 860
COP =
q
e
=
i
A
-i
D
...................................................................................(7.9)
A l i
B
-i
A
V = G
vA
=
Q
vA
=
Q
vA
(m
3
/h).......................................................................................................... (7.7)
q
e
i
A
- i
D
V' =
π
D
2
L X 60nL ............................................................................................................................................. (7.8)
4
A
l
: 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
c
and machine efficiency
h
m
should be considered.
COP'= COP x
h
c
x
h
m
............................................................................................................................(7.10)
TCL Air Conditioner Service Manual
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