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Byju's Answer
Standard X
Biology
Transpiration vs Evaporation.
In a vapour c...
Question
In a vapour compression refrigeration system, liquids to suction heat exchanger is used to
A
Keep the COP constant
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B
Prevent the liquid refrigerant from entering the compressor
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C
Sub-cool the liquid refrigerant leaving the condenser
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D
Sub-cool the vapour refrigerant from the evaporator
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Solution
The correct option is
C
Sub-cool the liquid refrigerant leaving the condenser
.
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2
Similar questions
Q.
Graph of suction temperature versus power per ton of refrigeration, keeping condenser temperature fixed in vapor compression refrigeration system in figure is:
Q.
The vapour compression refrigeration cycle is represented as shown in the figure below, with state
1
being the exit of the evaporator. The coordinate system used in this figure is
Q.
A refrigerator based on ideal vapour compression cycle operates between the temperature limits of
−
20
∘
C
and
40
∘
C
. The refrigerant enters the condenser as saturated vapour and leaves as saturated liquid. The enthalpy and entropy values for saturated liquid and vapour at these temperatures are given in table below.
T
h
f
h
g
s
f
s
g
(
∘
C
)
(
k
J
/
k
g
)
(
k
J
/
k
g
)
(
k
J
/
k
g
K
)
(
k
J
/
k
g
K
)
−
20
20
180
0.07
0.7366
40
80
200
0.3
0.67
If refrigerant circulation rate is
0.025
k
g
/
s
, the refrigeration effect is equal to
Q.
A refrigerator uses
R
−
134
a
as its refrigerant and operates on an ideal vapour compression refrigeration cycle between
0.14
M
P
a
and
0.8
M
P
a
. If the mass flow rate of the refrigerant is
0.05
k
g
/
s
,
the rate of heat rejection to the environment is \
(kW\).
Given data :
At
P
=
0
.14
M
P
a
,
h
=
236
.04
k
J
/
k
g
,
s
=
0.9322
k
J
/
k
g
K
At
P
=
0.8
M
P
a
,
h
=
272.05
k
J
/
k
g
(superheated vapour)
At
P
=
0.8
M
P
a
,
h
=
93.42
k
J
/
k
g
(saturated liquid)
Q.
A single acting
N
H
3
compressor follows the compression law
(
P
V
1.1
=
C
)
. The operating pressure for the vapour compression refrigeration are: 2.3637 bar
(
−
15
∘
C
) and 11.671 bar
(
+
30
∘
C
). The enthalpy at the exit of compression is 1560 kJ/kg. If refrigerant enters dry saturated to the compressor, then what is the heat loss from the compressor? The refrigeration capacity of the refrigerator is 10 tons..
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