Refrigeration – Refrigeration producer – Heat exchange between diverse function elements
Reexamination Certificate
2001-04-02
2002-11-19
Jiang, Chen-Wen (Department: 3744)
Refrigeration
Refrigeration producer
Heat exchange between diverse function elements
C062S498000
Reexamination Certificate
active
06481243
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a pressure accumulator at high pressure side and waste heat re-use device for vapor compressed air conditioning or refrigeration equipment, by which a pressure and a temperature, higher than a conventional device, for refrigerant at high pressure side can be maintained so as to increase the rate of heat dissipation and heat absorption capacity, and accordingly the energy efficiency ratio (EER).
Referring to
FIG. 1
, a fundamental structure of a conventional vapor compressed air conditioning and refrigeration equipment is shown. A liquid separator
1
is connected via a refrigerant pipe
3
to a compressor
2
such that the saturated refrigerant vapor is suctioned into the compressor
2
and compressed therein. Refrigerant vapor compressed by said compressor
2
will reach superheated state, and enter into a condenser
5
, so-called condenser or heat dissipater, via a refrigerant pipe
4
. Said condenser
5
comprises a plurality of fins and tubes
6
looped there within. Air is introduced into said condenser
5
for the heat dissipation of high temperature superheated refrigerant gas within condenser tubes, by the rotation of blades
7
of one or more sets of propeller fan
8
for heat dissipation fixed on a frame
9
.
Superheated refrigerant gas within condenser tubes will transform into saturated gas, then gas and liquid co-existed then saturated liquid phase after energy reduction through heat exchange with outside air. Since the saturated temperature, i.e. the refrigerant boiling temperature under pipe pressure within condenser is higher than the temperature of outside air, the enthalpy of refrigerant can be reduced by the heat dissipation through outside air, which will result in the liquidization of refrigerant vapor. The liquid-vapor ratio is thus increased. The liquid-vapor ratio will reach its maximum at the outlet of said condenser
5
. After the end of heat dissipation, the saturated refrigerant liquid will enter into a throttling valve
10
via a refrigerant pipe
11
to conduct an equal-enthalpy expansion process within said throttling valve. The pressure as well as temperature of the refrigerant will become lower after the expansion process. In this case, the saturated refrigerant under the lowering of saturated temperature and low pressure condition is enter into a heat absorptive tube-and-fin assembly
13
, so-called evaporator. Since the phase change from liquid to gas of the refrigerant, an equal-pressure (isobaric) process, is in need of latent heat, the heat contained in the room air, at higher-temperature, can be absorbed such that the temperature of the room can be reduced. Then, saturated refrigerant with lower liquid-vapor ratio is sent back to said liquid separator
1
via the collection of a refrigerant pipe
14
. Finally, the gas refrigerant is return to the compressor
2
via the refrigerant pipe
3
, to complete a closed refrigerantion cycle for the air conditioning or refrigeration equipment. In a conventional technique as shown in
FIG. 2
, a fundamental structure of vapor compressed air conditioning or refrigeration equipment with a two-stage heat dissipation is shown. A liquid separator
15
is connected via a refrigerant pipe
17
to a compressor
16
such that the saturated refrigerant vapor is suctioned into the compressor
16
and compressed therein. Refrigerant vapor compressed by said compressor
16
will reach superheated state, and enter into a first condenser
19
via a refrigerant pipe
18
. Said first condenser
19
comprises a plurality of fins and tubes
20
looped there within. Air is suctioned into said first condenser
19
for the heat dissipation of superheated refrigerant gas within condenser tubes, by the rotation of blades
21
of one or more sets of propeller fan
22
for heat dissipation fixed on a frame
23
. Superheated refrigerant gas within said first condenser
19
will transform into saturated phase after energy reduction through heat exchange with outside air. In this case, the refrigerant is at a state with its gas and liquid phase co-existed. Since the saturated temperature, i.e. the refrigerant boiling temperature under pipe pressure is still higher than the temperature of outside air, the enthalpy of refrigerant can still be reduced by the heat dissipation through outside air, which will result in the liquidization of refrigerant vapor. The liquid-vapor ratio is thus increased. The liquid-vapor ratio will reach its maximum value of first stage of heat dissipation at the outlet of said first condenser
19
. After the end of heat dissipation, the high liquid-vapor ratio refrigerant will enter into a second condenser
25
via a refrigerant pipe
24
. Said second condenser
25
comprises a plurality of fins and tubes
26
looped there within. Air is suctioned into said second condenser
25
for the heat dissipation of saturated refrigerant at higher temperature within condenser tubes
26
, by the rotation of a fan
27
, for heat dissipation, driven by one or more sets of high-speed motors
28
mounted on a frame
29
. Saturated liquid or sub-cooled refrigerant at the outlet of second condenser
25
can be assured. Subsequently, the refrigerant liquid will enter into a throttling valve
31
via a refrigerant pipe
30
to conduct an equal-enthalpy expansion process within said throttling valve. The pressure and temperature of the refrigerant will decrease after the expansion process. In this case, the saturated refrigerant under the lower saturated temperature and low pressure condition enter the evaporator
32
. Since the phase change from liquid to gas of the refrigerant, an isobaric process, is in need of latent heat, the heat contained in the room air can be absorbed such that the temperature of the room can be reduced. Then, saturated refrigerant with lower liquid-vapor ratio is sent back to said liquid separator
15
via the collection of a refrigerant pipe
33
. Finally, the gas refrigerant is return to the compressor
16
via the refrigerant pipe
17
, to complete a closed refrigerantion cycle for the air conditioning or refrigeration equipment with a two-stage heat dissipation.
In the fundamental structure of a conventional vapor compressed air conditioning and refrigeration equipment as shown in
FIG. 1
, since the refrigerant, being introduced directly into the condenser tubes
6
of said first condenser
5
after passing through compressor
2
, and being heat-dissipated by the air suctioned into said first condenser
5
by the rotation of blades
7
of one or more sets of fan
8
for heat dissipation, transforms from gas at high temperature and high pressure superheated state into saturated refrigerant with its gas and liquid co-existed at lower temperature and lower pressure. The heat dissipation efficiency deteriorates due to the reduction of temperature difference which will result in the reduction of temperature gradient. This will cause the liquid-vapor ratio of saturated refrigerant being unable to be raised further to a higher level at the outlet of first condenser
5
. This is the reason why the EER value of a conventional vapor compressed air conditioning and refrigeration equipment can not be improved.
The difference of two conventional vapor compressed air conditioning or refrigeration equipment as shown in
FIGS. 1 and 2
is the use of a two-stage heat dissipation method, i.e. a two-stage heat dissipation device including a heat dissipated first condenser
19
and a second condenser
25
as shown in FIG.
2
. In order to have better heat dissipation and to ensure the increase of liquid-vapor ratio of saturated refrigerant, a first condenser
19
is used to dissipate the heat of superheated refrigerant gas and a secondary condenser is used to dissipate the heat of saturated refrigerant. The heat was removed by the air introduced into said both condensers. Then, the refrigerant is circulated back to liquid separator
15
via refrigerant pipe
30
,throttling valve
31
, evaporator
32
and refrigerant pipe
33
. In this design, more heat can
Fang Wei
Hsiao Way-Jone
Bucknam & Archer
Jiang Chen-Wen
LandOfFree
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