CN111750574B - Refrigerating device and method for operating refrigerating device - Google Patents
Refrigerating device and method for operating refrigerating device Download PDFInfo
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- CN111750574B CN111750574B CN202010210789.9A CN202010210789A CN111750574B CN 111750574 B CN111750574 B CN 111750574B CN 202010210789 A CN202010210789 A CN 202010210789A CN 111750574 B CN111750574 B CN 111750574B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The present invention provides a refrigeration device capable of suppressing an increase in discharge temperature and a decrease in refrigerating capacity of a compressor. A refrigerating apparatus is provided with: a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator; a bypass circuit receiving at least a portion of the high pressure refrigerant to flow from the condenser to the evaporator through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger; a bypass on-off valve capable of adjusting the flow rate of the high-pressure refrigerant flowing into the bypass circuit; a liquid injection circuit for receiving at least a part of the high-pressure refrigerant passing through the condenser and guiding the refrigerant into the compressor; an injection on-off valve capable of adjusting the flow rate of the high-pressure refrigerant flowing into the liquid injection circuit; a temperature sensor for measuring the temperature of the high-pressure refrigerant flowing from the compressor to the condenser; and a controller for controlling the opening and closing of the bypass opening and closing valve and the opening and closing of the injection opening and closing valve based on the temperature measured by the temperature sensor.
Description
Technical Field
The present invention relates to a refrigerating apparatus and a method for operating the refrigerating apparatus.
Background
There is known a refrigeration apparatus equipped with a gas-liquid heat exchanger that uses a low-pressure refrigerant from an evaporator and supercools a high-pressure refrigerant from a condenser to improve the refrigerating capacity. The refrigeration apparatus restricts the amount of refrigerant passing through the gas-liquid heat exchanger at the time of refrigeration capacity control or high load, thereby realizing reduction in refrigeration capacity or load (patent documents 1 to 2).
In a refrigeration apparatus equipped with an offshore container (container), a bypass circuit is provided to a compressor from the front of an expansion valve to perform liquid injection of a liquid refrigerant, so that an increase in temperature of exhaust gas caused by an increase in the degree of superheat of intake gas due to a gas-liquid heat exchanger is suppressed (patent document 3).
[ background art document ]
[ patent literature ]
Patent document 1 Japanese patent laid-open No. 2002-31417
[ patent document 2] Japanese patent laid-open No. 2018-96621
[ patent document 3] Japanese patent laid-open No. 2005-226874
Disclosure of Invention
[ problem to be solved by the invention ]
However, since the high-pressure refrigerant is supercooled by the low-pressure refrigerant in the gas-liquid heat exchanger, the gas refrigerant at the inlet of the compressor is overheated by the gas-liquid heat exchanger, and the discharge temperature of the compressor increases.
In addition, although the rise in the discharge temperature is suppressed by the liquid injection, the refrigerant circulation amount through the evaporator is reduced by the liquid injection, and the refrigerating capacity is reduced. In addition, if the liquid injection is frequently opened/closed, the control of the superheat degree of the expansion valve is disturbed, and the freezing capacity is lowered.
Accordingly, an object of the present invention is to provide a refrigerating apparatus and a method of operating the refrigerating apparatus capable of suppressing a decrease in refrigerating capacity while suppressing an increase in the discharge temperature of a compressor.
[ means for solving the problems ]
The refrigeration device according to an aspect of the present invention includes: a compressor for discharging refrigerant; a condenser for condensing the refrigerant to output a high-pressure refrigerant; an expansion valve for expanding the high-pressure refrigerant; and an evaporator for evaporating the high-pressure refrigerant and outputting a low-pressure refrigerant; and is provided with: a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator; a bypass circuit receiving at least a portion of the high pressure refrigerant to flow from the condenser to the evaporator through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger; a liquid flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the bypass circuit; a liquid injection circuit receiving at least a portion of the high pressure refrigerant passing through the condenser and introducing the high pressure refrigerant into the compressor; an injection flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the liquid injection circuit; a temperature sensor for measuring a temperature of the high-pressure refrigerant flowing from the compressor to the condenser; and a control unit that controls the opening and closing of the opening and closing valve of the liquid flow rate adjustment unit and the opening and closing of the opening and closing valve of the injection flow rate adjustment unit based on the temperature measured by the temperature sensor.
[ Effect of the invention ]
According to the present invention, it is possible to provide a refrigerating apparatus and a method of operating the refrigerating apparatus capable of suppressing a decrease in refrigerating capacity while suppressing an increase in the discharge temperature of a compressor.
Drawings
Fig. 1 is a configuration diagram of a refrigerating apparatus according to embodiment 1.
Fig. 2 is a flowchart showing the process of the refrigerating apparatus according to embodiment 1.
Fig. 3 is a configuration diagram of a refrigerating apparatus according to embodiment 2.
Fig. 4 is a configuration diagram of a refrigerating apparatus according to embodiment 3.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples, and the present invention is not limited thereto except as specifically described. Elements having substantially the same functions and components are denoted by the same reference numerals, and their overlapping descriptions are omitted, while elements not directly related to the present invention are omitted.
Embodiments of a refrigerating apparatus and an operation method of the refrigerating apparatus according to the present invention are described in detail below with reference to the accompanying drawings.
(embodiment 1)
Fig. 1 is a configuration diagram of a refrigerating apparatus according to embodiment 1 of the present invention. As shown in fig. 1, the refrigerating apparatus of the present embodiment includes a compressor 1, a condenser 2, a gas-liquid heat exchanger 3, a bypass circuit 4, an expansion valve 5, an evaporator 6, a bypass on-off valve 7, a liquid injection circuit 8, an injection on-off valve 9, fans 2a and 6a (blowers), a temperature sensor 10, and a controller 11.
The compressor 1 compresses a refrigerant, discharges the compressed refrigerant, and supplies the compressed refrigerant to the condenser 2 through the pipe 1 a. The condenser 2 is a condenser (condenser), condenses the refrigerant supplied from the compressor 1, and supplies the condensed high-pressure refrigerant to the gas-liquid heat exchanger 3. The fan 2a cools the condensed high-pressure refrigerant by supplying air to the condenser 2.
The gas-liquid heat exchanger 3 is, for example, a double pipe heat exchanger in which a first pipe 3a and a second pipe 3b are arranged concentrically in cross section. Specifically, the sleeve structure is as follows: the first pipe 3a is located inside the cross section, and the second pipe 3b is located outside the cross section. The gas-liquid heat exchanger 3 exchanges heat between the high-pressure refrigerant passing through the condenser 2 and the low-pressure refrigerant passing through the evaporator 6.
The first pipe 3a is configured to pass the high-pressure refrigerant output from the condenser 2 and supply the high-pressure refrigerant to the expansion valve 5. The second pipe 3b is configured to pass the low-pressure refrigerant output from the evaporator 6 and supply the low-pressure refrigerant to the compressor 1.
The output of the gas-liquid heat exchanger 3 is connected to an expansion valve 5. The expansion valve 5 expands the refrigerant from the gas-liquid heat exchanger 3, thereby supplying the depressurized low-pressure refrigerant to the evaporator 6.
The evaporator 6 is an evaporator (evaporator), and evaporates the low-pressure refrigerant and supplies the low-pressure refrigerant to the second pipe 3b of the gas-liquid heat exchanger 3. The fan 6a supplies air to the evaporator 6, thereby cooling the evaporated low-pressure refrigerant. Since the high-pressure refrigerant is supplied to the first pipe 3a of the gas-liquid heat exchanger 3, heat exchange is performed between the low-pressure refrigerant and the high-pressure refrigerant.
The bypass circuit 4 is connected to the first pipe 3a of the gas-liquid heat exchanger 3, and receives at least a part of the high-pressure refrigerant flowing from the condenser 2 to the evaporator 6 through the gas-liquid heat exchanger 3, and bypasses the gas-liquid heat exchanger 3. The bypass on-off valve 7 corresponds to the liquid flow rate adjusting portion of the present invention, and is constituted by an electromagnetic valve attached to the bypass circuit 4, and adjusts the flow rate of the high-pressure refrigerant flowing into the bypass circuit 4 by performing an opening and closing operation.
The liquid injection circuit 8 is connected to a pipe 2b connected to the outlet side of the condenser 2, receives at least a part of the high-pressure refrigerant passing through the condenser 2, and introduces the high-pressure refrigerant into the compressor 1. The injection on-off valve 9 corresponds to an injection flow rate adjusting portion of the present invention, and is constituted by an electromagnetic valve attached to the liquid injection circuit 8, and adjusts the flow rate of the high-pressure refrigerant flowing from the condenser 2 into the liquid injection circuit 8 by performing an opening and closing operation.
The temperature sensor 10 is attached to a pipe 1a connected to the outlet side of the compressor 1, measures the temperature of the high-pressure refrigerant flowing from the compressor 1 to the condenser 2, and outputs the detected temperature data to the controller 11.
The controller 11 corresponds to a control unit of the present invention, and controls the opening and closing of the bypass opening/closing valve 7 and the opening/closing of the injection opening/closing valve 9 based on the temperature measured by the temperature sensor 10.
The controller 11 determines whether or not the temperature measured by the temperature sensor 10 is equal to or higher than a 1 st predetermined value Ta, and sets the bypass opening/closing valve 7 to an open state when it is determined that the temperature is equal to or higher than the 1 st predetermined value Ta.
The controller 11 determines whether or not the temperature measured by the temperature sensor 10 is equal to or greater than a 2 nd predetermined value Tb that is greater than a 1 st predetermined value Ta, and sets the injection on-off valve 9 in an open state when it is determined that the temperature is equal to or greater than the 2 nd predetermined value Tb.
Next, the operation of the refrigerating apparatus according to embodiment 1 configured as described above will be described in detail with reference to a flowchart shown in fig. 2.
First, the high-pressure refrigerant compressed by the compressor 1 is supplied to the condenser 2. The condensed high-pressure refrigerant is supplied to the gas-liquid heat exchanger 3 and the liquid injection circuit 8. The high-pressure refrigerant is introduced into the first pipe 3a of the gas-liquid heat exchanger 3.
Next, the discharge temperature of the compressor 1 is detected by the temperature sensor 10 (step S11). The controller 11 determines whether or not the temperature measured by the temperature sensor 10 is equal to or higher than a 1 st predetermined value Ta (step S12), and when it is determined that the temperature is equal to or higher than the 1 st predetermined value Ta, the bypass opening/closing valve 7 is opened (step S13).
Therefore, the bypass circuit 4 receives at least a part of the high-pressure refrigerant to be passed from the condenser 2 to the evaporator 6 through the gas-liquid heat exchanger 3, and bypasses the gas-liquid heat exchanger 3 (step S14).
Thereafter, the high-pressure refrigerant is introduced into the expansion valve 5, and passes through the expansion valve 5 at an appropriate opening degree, whereby the high-pressure refrigerant is depressurized to become a low-pressure refrigerant. Thereafter, the low-pressure refrigerant is introduced into the evaporator 6, and the refrigerant evaporates and vaporizes.
The low-pressure refrigerant output from the evaporator 6 is introduced into the second pipe 3b of the gas-liquid heat exchanger 3, and exchanges heat with the high-pressure refrigerant flowing through the first pipe 3a. The low-pressure refrigerant flowing through the second pipe 3b is output from the gas-liquid heat exchanger 3. Thereafter, the low-pressure refrigerant is introduced into the compressor 1, compressed again, and circulated.
By bypassing a part of the liquid refrigerant flowing into the gas-liquid heat exchanger 3 by the bypass circuit 4 in this way, the supercooling degree of the high-pressure refrigerant can be reduced. Therefore, the refrigerating capacity is not greatly reduced, and the rise in the discharge temperature of the compressor 1 can be suppressed. This can avoid frequent operations of the liquid injection circuit 8 and the injection on-off valve 9.
When the bypass control state of the bypass circuit 4 is continued, the controller 11 determines whether or not the temperature measured by the temperature sensor 10 is equal to or higher than a 2 nd predetermined value Tb which is greater than a 1 st predetermined value Ta, even when the open state of the bypass on-off valve 7 is continued (step S15). When the determination temperature is equal to or higher than the 2 nd predetermined value Tb, the injection on-off valve 9 is opened (step S16).
Therefore, a part of the high-pressure refrigerant supplied from the condenser 2 is introduced into the compressor 1. In the liquid injection, since the high-pressure refrigerant from the liquid injection circuit 8 is introduced into the low-pressure refrigerant from the gas-liquid heat exchanger 3, an increase in the discharge temperature of the compressor 1 can be suppressed.
Further, by utilizing the synergistic effect of the bypass control and the liquid injection control, the drop in freezing capacity can be suppressed, the number of liquid injection operations can be reduced, and the variation in discharge temperature can be suppressed. In addition, the lifetime of the injection on-off valve 9 can be prolonged. In addition, the time for high load pull-down can be shortened.
The applicant conducted a high load pulldown test for the refrigerating apparatus of embodiment 1, which was changed from 40℃to-25 ℃. In this test, the time required for cooling from 40℃to-25℃and the number of liquid injections (referred to herein as "pull-down time") were measured, and the conventional refrigerating apparatus was compared with the refrigerating apparatus of the embodiment.
In the conventional refrigerating apparatus, only the liquid injection control was performed, the pull-down time was 103 hours, and the number of liquid injections was 10.
In contrast, in the refrigerating apparatus according to the embodiment, the liquid injection control and the bypass control were performed, the pull-down time was 87 hours, and the number of liquid injections was 3. According to the results of the test, the refrigerating apparatus according to the embodiment has a fast cooling time and a small number of operations of the injection on-off valve 9. Therefore, the refrigerating apparatus according to the embodiment can suppress a decrease in refrigerating capacity and can lengthen the life of the injection on-off valve 9.
(embodiment 2)
Fig. 3 is a configuration diagram of a refrigerating apparatus according to embodiment 2. The refrigeration apparatus according to embodiment 1 is configured such that the bypass circuit 4 is connected to the first pipe 3a of the gas-liquid heat exchanger 3, and the refrigeration apparatus according to embodiment 2 is configured such that the bypass circuit 4b is connected to the 2 nd pipe 3b of the gas-liquid heat exchanger 3.
The bypass circuit 4b receives at least a portion of the low pressure refrigerant to flow from the evaporator 6 to the compressor 1 through the gas-liquid heat exchanger 3, bypassing the gas-liquid heat exchanger. The other configuration shown in fig. 3 is the same as that shown in fig. 1. The operation of the cooling device shown in fig. 3 is the same as the process shown in the flowchart shown in fig. 2, and differs from the following process.
When the controller 11 determines that the discharge temperature is equal to or higher than the 1 st predetermined value Ta, the bypass opening/closing valve 7b is opened. Thus, the bypass circuit 4b receives at least a portion of the low pressure refrigerant to flow from the evaporator 6 to the compressor 1 through the gas-liquid heat exchanger 3, bypassing the gas-liquid heat exchanger.
By bypassing a part of the low-pressure refrigerant flowing into the gas-liquid heat exchanger 3 by the bypass circuit 4b in this way, the supercooling degree of the high-pressure refrigerant can be reduced. Therefore, the refrigerating capacity is not greatly reduced, and the rise in the discharge temperature of the compressor 1 can be suppressed. This can avoid frequent operations of the liquid injection circuit 8 and the injection on-off valve 9.
Further, by utilizing the synergistic effect of the bypass control and the liquid injection, the drop in freezing capacity can be suppressed, the number of liquid injection operations can be reduced, and the variation in discharge temperature can be suppressed. In addition, the lifetime of the injection on-off valve 9 can be prolonged. In addition, the pull-down time can be shortened.
(embodiment 3)
Fig. 4 is a configuration diagram of a refrigerating apparatus according to embodiment 3. In the refrigeration apparatus according to embodiment 3, a bypass circuit 4 is connected to a first pipe 3a of the gas-liquid heat exchanger 3, and a bypass circuit 4b is connected to a second pipe 3b of the gas-liquid heat exchanger 3. The bypass circuit 4 is provided with a bypass opening/closing valve 7, and the bypass circuit 4b is provided with a bypass opening/closing valve 7b.
The controller 11 determines whether or not the temperature measured by the temperature sensor 10 is equal to or higher than a 1 st predetermined value Ta, and sets the bypass on-off valve 7 and the bypass on-off valve 7b in an open state when the temperature is determined to be equal to or higher than the 1 st predetermined value Ta.
Thus, the bypass circuit 4 receives at least a portion of the high-pressure refrigerant to be passed from the condenser 2 to the evaporator 6 through the gas-liquid heat exchanger 3, bypassing the gas-liquid heat exchanger 3. The bypass circuit 4b receives at least a portion of the low pressure refrigerant to flow from the evaporator 6 to the compressor 1 through the gas-liquid heat exchanger 3, bypassing the gas-liquid heat exchanger.
By bypassing a part of the high-pressure refrigerant flowing into the gas-liquid heat exchanger 3 by the bypass circuit 4 in this way, a part of the low-pressure refrigerant flowing into the gas-liquid heat exchanger 3 by the bypass circuit 4b can be bypassed, and the degree of supercooling of the high-pressure refrigerant can be reduced. Therefore, the refrigerating capacity is not greatly reduced, and the rise in the discharge temperature of the compressor 1 can be suppressed. This can avoid frequent operations of the liquid injection circuit 8 and the injection on-off valve 9.
Further, by utilizing the synergistic effect of the bypass control and the liquid injection, the drop in freezing capacity can be suppressed, the number of liquid injection operations can be reduced, and the variation in discharge temperature can be suppressed. In addition, the lifetime of the injection on-off valve 9 can be prolonged. In addition, the pull-down time can be shortened.
In the refrigerating apparatus according to embodiment 3, when the discharge temperature is equal to or higher than the predetermined temperature Ta, the bypass circuit 4 and the bypass circuit 4b are operated simultaneously. For example, when the discharge temperature is set to the predetermined temperature Ta, one of the bypass circuit 4 and the bypass circuit 4b may be operated, and when the discharge temperature is set to a temperature between the predetermined temperatures Ta and Tb, the other of the bypass circuit 4 and the bypass circuit 4b may be operated.
In the description of the above embodiment, the gas-liquid heat exchanger 3 is configured as follows: the high-pressure refrigerant passing through the condenser 2 is introduced into the first pipe 3a, and the low-pressure refrigerant passing through the evaporator is introduced into the second pipe 3b, but the configuration may be as follows: the low-pressure refrigerant passing through the evaporator is introduced into the first pipe 3a, and the high-pressure refrigerant passing through the condenser 2 is introduced into the second pipe 3b.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.
Claims (6)
1. A refrigerating apparatus is characterized by comprising: a compressor for discharging refrigerant; a condenser for condensing the refrigerant to output a high-pressure refrigerant; an expansion valve for expanding the high-pressure refrigerant; and an evaporator for evaporating the high-pressure refrigerant and outputting a low-pressure refrigerant; and is provided with:
a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator;
a bypass circuit receiving at least a portion of the high pressure refrigerant to flow from the condenser to the evaporator through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger;
a liquid flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the bypass circuit;
a liquid injection circuit receiving at least a portion of the high pressure refrigerant passing through the condenser and introducing the high pressure refrigerant into the compressor;
an injection flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the liquid injection circuit;
a temperature sensor for measuring a temperature of the high-pressure refrigerant flowing from the compressor to the condenser; a kind of electronic device with high-pressure air-conditioning system
A control unit for controlling the opening and closing of the opening and closing valve of the liquid flow rate adjustment unit and the opening and closing of the opening and closing valve of the injection flow rate adjustment unit based on the temperature measured by the temperature sensor,
the control unit sets a 1 st predetermined value and a 2 nd predetermined value higher than the 1 st predetermined value, determines whether or not the temperature measured by the temperature sensor is equal to or higher than the 1 st predetermined value,
when it is determined that the temperature is equal to or higher than the 1 st predetermined value, the on-off valve of the liquid flow rate adjusting unit is opened to receive at least a part of the high-pressure refrigerant flowing from the condenser to the evaporator through the gas-liquid heat exchanger and bypass the gas-liquid heat exchanger,
while the open state of the on-off valve of the liquid flow rate adjusting section is maintained, it is determined whether or not the temperature is equal to or higher than the 2 nd predetermined value,
when it is determined that the temperature is equal to or higher than the 2 nd predetermined value, the on-off valve of the injection flow rate adjustment unit is opened, at least a part of the high-pressure refrigerant flowing from the condenser to the evaporator through the gas-liquid heat exchanger is received, the high-pressure refrigerant is bypassed around the gas-liquid heat exchanger, and at least a part of the high-pressure refrigerant having passed through the condenser is received and introduced into the compressor.
2. The refrigeration apparatus according to claim 1, wherein the gas-liquid heat exchanger includes a first pipe through which a high-pressure refrigerant from the condenser passes and a second pipe through which a low-pressure refrigerant from the evaporator passes,
the bypass circuit is connected to the first pipe of the gas-liquid heat exchanger.
3. A refrigerating apparatus is characterized by comprising: a compressor for discharging refrigerant; a condenser for condensing the refrigerant to output a high-pressure refrigerant; an expansion valve for expanding the high-pressure refrigerant; and an evaporator for evaporating the high-pressure refrigerant and outputting a low-pressure refrigerant; and is provided with:
a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator;
a bypass circuit receiving at least a portion of the low pressure refrigerant to flow from the evaporator to the compressor through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger;
a liquid flow rate adjustment unit configured to adjust a flow rate of the low-pressure refrigerant flowing into the bypass circuit;
a liquid injection circuit receiving at least a portion of the high pressure refrigerant passing through the condenser and introducing the high pressure refrigerant into the compressor;
an injection flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the liquid injection circuit;
a temperature sensor for measuring a temperature of the high-pressure refrigerant flowing from the compressor to the condenser; a kind of electronic device with high-pressure air-conditioning system
A control unit for controlling the opening and closing of the opening and closing valve of the liquid flow rate adjustment unit and the opening and closing of the opening and closing valve of the injection flow rate adjustment unit based on the temperature measured by the temperature sensor,
the control unit sets a 1 st predetermined value and a 2 nd predetermined value higher than the 1 st predetermined value, determines whether or not the temperature measured by the temperature sensor is equal to or higher than the 1 st predetermined value,
when it is determined that the temperature is equal to or higher than the 1 st predetermined value, the on-off valve of the liquid flow rate adjusting unit is opened to receive at least a part of the low-pressure refrigerant flowing from the evaporator to the compressor through the gas-liquid heat exchanger and bypass the gas-liquid heat exchanger,
while the open state of the on-off valve of the liquid flow rate adjusting section is maintained, it is determined whether or not the temperature is equal to or higher than the 2 nd predetermined value,
when it is determined that the temperature is equal to or higher than the 2 nd predetermined value, the opening/closing valve of the injection flow rate adjustment unit is opened, at least a part of the low-pressure refrigerant flowing from the evaporator to the compressor through the gas-liquid heat exchanger is received, the low-pressure refrigerant bypasses the gas-liquid heat exchanger, and at least a part of the high-pressure refrigerant having passed through the condenser is received and introduced into the compressor.
4. The refrigeration apparatus according to claim 3, wherein the gas-liquid heat exchanger includes a first pipe through which a high-pressure refrigerant from the condenser passes and a second pipe through which a low-pressure refrigerant from the evaporator passes,
the bypass circuit is connected to the second pipe of the gas-liquid heat exchanger.
5. A method of operating a refrigeration apparatus, the refrigeration apparatus comprising: a compressor for discharging refrigerant; a condenser for condensing the refrigerant to output a high-pressure refrigerant; an expansion valve for expanding the high-pressure refrigerant; an evaporator for evaporating the high-pressure refrigerant and outputting a low-pressure refrigerant; a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator; a bypass circuit receiving at least a portion of the high pressure refrigerant to flow from the condenser to the evaporator through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger; a liquid flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the bypass circuit; a liquid injection circuit receiving at least a portion of the high pressure refrigerant passing through the condenser and introducing the high pressure refrigerant into the compressor; an injection flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the liquid injection circuit; a temperature sensor for measuring a temperature of the high-pressure refrigerant flowing from the compressor to the condenser; and a control unit that controls the opening and closing of the opening and closing valve of the liquid flow rate adjustment unit and the opening and closing of the opening and closing valve of the injection flow rate adjustment unit based on the temperature measured by the temperature sensor; and the operation method of the refrigerating device comprises the following steps:
setting the temperature of the 1 st prescribed value and the 2 nd prescribed value larger than the 1 st prescribed value,
a 1 st determination step of determining whether or not the temperature measured by the temperature sensor is equal to or higher than the 1 st predetermined value;
a 1 st valve opening step of, when it is determined that the temperature is equal to or higher than the 1 st predetermined value, opening an on-off valve of the liquid flow rate adjustment unit to receive at least a part of the high-pressure refrigerant flowing from the condenser to the evaporator through the gas-liquid heat exchanger, and bypassing the gas-liquid heat exchanger;
a 2 nd determination step of determining whether or not the temperature is equal to or higher than the 2 nd predetermined value while the open state of the on-off valve of the liquid flow rate adjustment unit is continued; a kind of electronic device with high-pressure air-conditioning system
And a 2 nd valve opening step of, when it is determined that the temperature is equal to or higher than the 2 nd predetermined value, opening an on-off valve of the injection flow rate adjusting unit, receiving at least a part of the high-pressure refrigerant flowing from the condenser to the evaporator through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger, and receiving at least a part of the high-pressure refrigerant having passed through the condenser, and introducing the high-pressure refrigerant into the compressor.
6. A method of operating a refrigeration apparatus, the refrigeration apparatus comprising: a compressor for discharging refrigerant; a condenser for condensing the refrigerant to output a high-pressure refrigerant; an expansion valve for expanding the high-pressure refrigerant; an evaporator for evaporating the high-pressure refrigerant and outputting a low-pressure refrigerant; a gas-liquid heat exchanger for exchanging heat between the high-pressure refrigerant passing through the condenser and the low-pressure refrigerant passing through the evaporator; a bypass circuit receiving at least a portion of the low pressure refrigerant to flow from the evaporator to the compressor through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger; a liquid flow rate adjustment unit configured to adjust a flow rate of the low-pressure refrigerant flowing into the bypass circuit; a liquid injection circuit receiving at least a portion of the high pressure refrigerant passing through the condenser and introducing the high pressure refrigerant into the compressor; an injection flow rate adjustment unit configured to adjust a flow rate of the high-pressure refrigerant flowing into the liquid injection circuit; a temperature sensor for measuring a temperature of the high-pressure refrigerant flowing from the compressor to the condenser; and a control unit that controls the opening and closing of the opening and closing valve of the liquid flow rate adjustment unit and the opening and closing of the opening and closing valve of the injection flow rate adjustment unit based on the temperature measured by the temperature sensor; and the operation method of the refrigerating device comprises the following steps:
setting the temperature of the 1 st prescribed value and the 2 nd prescribed value larger than the 1 st prescribed value,
a 1 st determination step of determining whether or not the temperature measured by the temperature sensor is equal to or higher than the 1 st predetermined value;
a 1 st valve opening step of, when it is determined that the temperature is equal to or higher than the 1 st predetermined value, opening an on-off valve of the liquid flow rate adjustment unit to receive at least a part of the low-pressure refrigerant flowing from the evaporator to the compressor through the gas-liquid heat exchanger, and bypassing the gas-liquid heat exchanger;
a 2 nd determination step of determining whether or not the temperature is equal to or higher than the 2 nd predetermined value while the open state of the on-off valve of the liquid flow rate adjustment unit is continued; a kind of electronic device with high-pressure air-conditioning system
And a 2 nd valve opening step of, when it is determined that the temperature is equal to or higher than the 2 nd predetermined value, opening an on-off valve of the injection flow rate adjusting unit, receiving at least a part of the low-pressure refrigerant flowing from the evaporator to the compressor through the gas-liquid heat exchanger, bypassing the gas-liquid heat exchanger, and receiving at least a part of the high-pressure refrigerant having passed through the condenser, and introducing the refrigerant into the compressor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019062391A JP6929318B2 (en) | 2019-03-28 | 2019-03-28 | Refrigeration equipment and operation method of refrigeration equipment |
| JP2019-062391 | 2019-03-28 |
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| Publication Number | Publication Date |
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| CN111750574A CN111750574A (en) | 2020-10-09 |
| CN111750574B true CN111750574B (en) | 2023-09-15 |
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| CN202010210789.9A Active CN111750574B (en) | 2019-03-28 | 2020-03-24 | Refrigerating device and method for operating refrigerating device |
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| JP (1) | JP6929318B2 (en) |
| CN (1) | CN111750574B (en) |
| PH (1) | PH12020050037A1 (en) |
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| CN216346591U (en) * | 2021-09-18 | 2022-04-19 | 青岛海尔空调电子有限公司 | Air conditioner |
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| JP2009180406A (en) * | 2008-01-30 | 2009-08-13 | Calsonic Kansei Corp | Supercritical refrigerating cycle |
| WO2017199382A1 (en) * | 2016-05-18 | 2017-11-23 | 三菱電機株式会社 | Refrigerating device |
| JP2018096621A (en) * | 2016-12-14 | 2018-06-21 | 三菱重工サーマルシステムズ株式会社 | Refrigerant circuit system and process of control for refrigerant circuit system |
| WO2019052761A1 (en) * | 2017-09-14 | 2019-03-21 | Weiss Umwelttechnik Gmbh | Air-conditioning method and device |
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| JPH0820138B2 (en) * | 1989-08-02 | 1996-03-04 | ダイキン工業株式会社 | Refrigeration equipment |
| JP2002031417A (en) * | 2000-07-19 | 2002-01-31 | Mitsubishi Heavy Ind Ltd | Refrigerating apparatus |
| JP2005226874A (en) * | 2004-02-10 | 2005-08-25 | Mitsubishi Heavy Ind Ltd | Refrigeration device and refrigeration method |
| JP2007240041A (en) * | 2006-03-07 | 2007-09-20 | Tgk Co Ltd | Expansion valve |
| JP4787070B2 (en) * | 2006-05-30 | 2011-10-05 | サンデン株式会社 | Refrigeration cycle |
| TWI506237B (en) * | 2012-11-23 | 2015-11-01 | Ind Tech Res Inst | Refrigeration and air condition system |
| CN104819590B (en) * | 2014-02-03 | 2019-10-25 | 东普雷股份有限公司 | The method of operation of refrigerating plant and refrigerating plant |
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2019
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- 2020-03-16 PH PH12020050037A patent/PH12020050037A1/en unknown
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| JP2009180406A (en) * | 2008-01-30 | 2009-08-13 | Calsonic Kansei Corp | Supercritical refrigerating cycle |
| WO2017199382A1 (en) * | 2016-05-18 | 2017-11-23 | 三菱電機株式会社 | Refrigerating device |
| JP2018096621A (en) * | 2016-12-14 | 2018-06-21 | 三菱重工サーマルシステムズ株式会社 | Refrigerant circuit system and process of control for refrigerant circuit system |
| WO2018110185A1 (en) * | 2016-12-14 | 2018-06-21 | 三菱重工サーマルシステムズ株式会社 | Refrigerant circuit system and method for controlling refrigerant circuit system |
| WO2019052761A1 (en) * | 2017-09-14 | 2019-03-21 | Weiss Umwelttechnik Gmbh | Air-conditioning method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI807163B (en) | 2023-07-01 |
| TW202102805A (en) | 2021-01-16 |
| CN111750574A (en) | 2020-10-09 |
| PH12020050037A1 (en) | 2020-12-02 |
| JP2020159665A (en) | 2020-10-01 |
| JP6929318B2 (en) | 2021-09-01 |
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