CN108469134B - Improved air-cooled condenser and control method thereof - Google Patents
Improved air-cooled condenser and control method thereof Download PDFInfo
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- CN108469134B CN108469134B CN201810340744.6A CN201810340744A CN108469134B CN 108469134 B CN108469134 B CN 108469134B CN 201810340744 A CN201810340744 A CN 201810340744A CN 108469134 B CN108469134 B CN 108469134B
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B49/027—Condenser control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses an improved air-cooled condenser and a control method thereof, wherein the condenser comprises an outdoor fan, an outdoor heat exchanger, a pressure sensor control system and a double-pipe heat exchanger arranged on a liquid outlet pipeline of the outdoor heat exchanger, a tank body of the double-pipe heat exchanger is communicated with the liquid outlet pipeline of the outdoor heat exchanger, and an inner pipe is connected with an air inlet pipe of the outdoor heat exchanger; a first electromagnetic valve and a one-way valve are arranged on a pipeline between a liquid outlet of the outdoor heat exchanger and a liquid inlet of the sleeve heat exchanger tank body; the pipeline connecting the outdoor heat exchanger, the first electromagnetic valve and the one-way valve is connected in parallel with a first bypass pipeline, and the first bypass pipeline is provided with a second electromagnetic valve; a third electromagnetic valve is arranged between the inner pipe of the sleeve type heat exchanger and the air inlet pipe of the outdoor heat exchanger. The invention solves the problems of safe and reliable operation and starting of the air-cooled machine room air conditioner in a wide temperature range all the year round, expands the use region of the machine room air conditioner, and has good operation effect in northeast and northwest regions with the environmental temperature lower than-15 ℃.
Description
Technical Field
The invention is applied to a machine room air conditioner, in particular relates to an improved air-cooled condenser and a control method thereof, and belongs to the technical field of refrigeration equipment.
Background
The machine room air conditioner belongs to a technical air conditioner, and the served objects are mostly places with great heat productivity, such as a data transmission machine room, a program control exchange machine room, an IDC data center and the like. The heat productivity of the server is great, and the heat load is not changed by seasonal variation, so the machine room air conditioner is required to perform refrigeration operation all year round. Because of geographical factors, the national operators are wide, the difference between the north and south climates is large, and the outdoor temperature is changed greatly, the environment temperature of the outdoor condenser of the air-cooled machine room air conditioner is changed greatly from low temperature to high temperature. In order to ensure safe, stable and reliable operation of the air conditioning and refrigerating system of the machine room, most air conditioning manufacturers currently adopt the speed regulation operation of an outdoor condensing fan, and the speed regulation mode also comprises two modes of voltage regulation and frequency regulation. The regulation mode can basically cope with the situation that the use effect is poor in northeast and northwest areas of the north-south China, the environment is lower than-15 ℃, low-voltage alarm can be frequently generated, and even the machine cannot be started after the machine is stopped.
In view of the above problems, patent ZL 200920129849.3 discloses a low temperature start-up assembly. The low-temperature starting assembly comprises a liquid reservoir, a one-way valve and an electromagnetic valve, the low-temperature assembly is connected in series behind the condenser, and after the low-temperature assembly is stopped, the liquid supply amount of the evaporator is ensured by means of closing actions of the electromagnetic valve and the one-way valve and a sufficient amount of refrigerant reserved in the liquid reservoir. The patent ZL 201210403521.2 discloses a compression refrigeration condensing system capable of being started at low temperature and operated at low temperature, and the core method is that a bypass is arranged at an outlet of a compressor, a differential pressure opening bypass valve is arranged at the bypass, a parallel grouping condenser and a condensing pressure regulating valve are arranged at the same time, and the differential pressure of an expansion valve is ensured by virtue of a mechanical valve body of the bypass and the parallel grouping condenser. Patent ZL201720397155.2 discloses a low temperature start-up's computer lab air conditioner, contains liquid storage device and parallelly connected solenoid valve that sets up. And when the temperature is lower than-20 ℃, the control system opens the electromagnetic valve so as to ensure the pressure difference of the expansion valve.
The prior art is not suitable for areas with lower temperature environment, or the control precision of a mechanical valve is not high, and the manufacturing cost and the part cost of the condenser grouping are high. Therefore, how to accurately, efficiently and energy-effectively solve the problems of running and starting the air conditioner in the extremely low temperature machine room is still to be further researched.
Disclosure of Invention
The invention aims to: aiming at the defects existing in the prior art, the invention aims to provide an improved air-cooled condenser and a control method thereof, so as to realize safe and reliable operation and starting of an air-cooled machine room air conditioner in a full-year wide temperature range.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme:
an improved air-cooled condenser comprises an outdoor fan, an outdoor heat exchanger, a pressure sensor and a control system, wherein the pressure sensor is arranged on an air inlet pipeline of the outdoor heat exchanger and used for detecting high-pressure, and the control system is connected with the outdoor fan and the pressure sensor; the condenser also comprises a double pipe heat exchanger arranged on the liquid outlet pipeline of the outdoor heat exchanger, the tank body of the double pipe heat exchanger is communicated with the liquid outlet pipeline of the outdoor heat exchanger, and the inner pipe is connected with the air inlet pipeline of the outdoor heat exchanger; a first electromagnetic valve and a one-way valve are arranged on a pipeline between a liquid outlet of the outdoor heat exchanger and a liquid inlet of the sleeve heat exchanger tank body; the pipeline connecting the outdoor heat exchanger, the first electromagnetic valve and the one-way valve is connected in parallel with a first bypass pipeline, and the first bypass pipeline is provided with a second electromagnetic valve; a third electromagnetic valve is arranged between the inner pipe of the double pipe heat exchanger and the air inlet pipe of the outdoor heat exchanger; the control system is respectively connected with the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve and is used for outputting control signals to the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve.
Preferably, a liquid level sensor and a temperature sensor are arranged in the sleeve type heat exchanger tank body; the control system is connected with the liquid level and temperature sensor and is used for receiving the detected liquid level and temperature signals.
Preferably, the tank volume of the double pipe heat exchanger is more than 2 times of the internal volume of the outdoor heat exchanger.
Preferably, the double pipe heat exchanger is located outdoors.
The air-cooled condenser of the present invention can operate in two modes:
1. and in the conventional temperature cycle (the high-pressure of the refrigeration system is not lower than a set value), under the environment, a first electromagnetic valve of the condenser is opened, a second electromagnetic valve and a third electromagnetic valve are closed, and the refrigerant in the system flows back to the heat exchanger of the indoor unit through the outdoor heat exchanger, the second electromagnetic valve and the double-pipe heat exchanger in sequence.
2. And in the cold temperature circulation (the high-pressure of the refrigerating system is lower than a set value), under the environment, the first electromagnetic valve of the condenser is closed, the second electromagnetic valve is opened to perform bypass circulation, and the refrigerant high-pressure gas which is not cooled by the condenser heat exchanger directly enters the double-pipe heat exchanger, so that the pressure in the double-pipe heat exchanger is ensured, and the condensing pressure of a unit is improved. At this time, because the first electromagnetic valve is closed, the refrigerant condensed into liquid gradually occupies the internal volume of the outdoor heat exchanger, the high pressure also gradually rises, and when the high pressure rises to the set high pressure, the second electromagnetic valve is closed, the first electromagnetic valve is opened, and the conventional circulation is performed. Under the cold temperature condition, if the temperature of the refrigerant is lower than the lowest temperature of the conventional refrigerant by 32 ℃, the third electromagnetic valve is opened, and the high-temperature gas refrigerant heats the liquid refrigerant through the flow path of the double-pipe heat exchanger, so that the solubility of the liquid refrigerant and the lubricating oil is ensured, and the mechanical safety of the compressor is ensured.
The control method of the improved air-cooled condenser comprises the following steps:
when the high-pressure of the air-cooled condenser is larger than a set value, the first electromagnetic valve is opened, and the second electromagnetic valve and the third electromagnetic valve are closed;
when the first electromagnetic valve is opened and the second electromagnetic valve is closed, if the high-pressure is larger than the pressure set value, the fan runs at full speed, and if the high-pressure is between the set value and the control proportion band, the fan runs at speed regulation;
when the first electromagnetic valve is opened and the second electromagnetic valve is closed, if the high-pressure is lower than a set value, controlling the fan to run at the lowest rotating speed or stop running, and if the high-pressure is continuously lower than the set value, closing the first electromagnetic valve and opening the second electromagnetic valve;
when the first electromagnetic valve is closed and the second electromagnetic valve is opened, if the temperature of the refrigerant in the double-pipe heat exchanger tank body is lower than the conventional minimum temperature of the refrigerant, the third electromagnetic valve is opened; if the refrigerant temperature is higher than the conventional minimum refrigerant temperature, closing the third solenoid valve;
and when the first electromagnetic valve is closed and the second electromagnetic valve is opened, if the high-pressure fall back is equal to the pressure set value, the second electromagnetic valve is closed, the first electromagnetic valve is opened, and the fan continues to keep the lowest rotating speed to operate or stops operating.
Preferably, the control method further includes:
if the double pipe heat exchanger reaches the lowest liquid level, the second electromagnetic valve and the third electromagnetic valve are closed, and the first electromagnetic valve is opened; if the set time is continued and the liquid level is still in the lowest liquid level state, the system is stopped.
The beneficial effects are that: compared with the prior art, the invention has the following effects and advantages:
1. the use region of the machine room air conditioner is expanded, and the machine room air conditioner using the condenser has good operation effect in northeast and northwest regions with the environmental temperature lower than-15 ℃.
2. After the invention is adopted, the air-cooled direct expansion type machine room air conditioner can reduce or eliminate the low-pressure alarm frequency, thereby ensuring the constancy of the temperature and humidity in the machine room.
3. The invention can ensure the smooth start of the refrigeration system no matter the temperature, improve the intersolubility of the lubricating oil and the liquid refrigerant at low temperature and ensure the mechanical property of the refrigeration compressor.
4. The method for controlling the high-pressure and the liquid level and the temperature of the refrigerant, which are provided by the invention, adopt the current popular single chip microcomputer control instead of mechanical control, and have the advantages of high control precision, high response speed and low control cost;
5. the method for heating the liquid refrigerant utilizes the high-temperature gas discharged by the compressor, heats the liquid refrigerant through the flow path of the high-temperature gas in the double-pipe heat exchanger, saves energy and protects environment, and is more energy-saving and 200kW-h than the traditional electric heating belt mode all the year round.
6. The physical devices used in the invention are conventional one-way valves, electromagnetic valves, double-pipe heat exchangers and the like, and have the characteristics of simple selection, low manufacturing cost and easy field installation and transformation.
Drawings
Fig. 1 is a schematic diagram of a conventional air-cooled condenser.
Fig. 2 is a schematic diagram of an air-cooled condenser according to an embodiment of the present invention.
In the figure: 1-an outdoor fan; 2-an outdoor heat exchanger; 3-a pressure sensor; 4-a control system; 5-a one-way valve; 6-a first solenoid valve; 7-a second solenoid valve; 8-a third solenoid valve; 9-double pipe heat exchanger; 10-liquid level and temperature sensor.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1, the conventional air-cooled condenser mainly includes an outdoor fan 1, an outdoor heat exchanger 2, a pressure sensor 3, and a control system 4. The pressure sensor 3 is arranged on the air inlet pipeline of the outdoor heat exchanger and is used for detecting the high-pressure of the refrigerating system. The control system 4 collects the pressure value of the pressure sensor 3 (i.e. the high pressure of the refrigerating system), compares the pressure value with the set value of the high pressure of the control system 4, and adjusts the rotating speed of the outdoor fan 1 according to the proportion by the obtained difference value, and the purpose of closed-loop control of the condensing pressure is achieved by adjusting the voltage or the frequency. The conventional air-cooled condenser has no problem in the north-south China region environment, but in the northeast and northwest regions with extremely low temperature, if the shutdown time is too long, the outdoor unit is kept still in the low temperature environment, the refrigerant can migrate to the low-pressure and low-temperature position, namely a large amount of refrigerant can migrate from the indoor unit to the outdoor unit heat exchanger 2, so that when the indoor unit is restarted, the indoor unit lacks refrigerant, and the compressor cannot be started due to vacuum pumping. Even if the air conditioner is started smoothly, the air conditioner is often not operated normally because the outdoor environment temperature is low and even if the outdoor fan is not operated, the pressure of the refrigerant passing through the heat exchanger of the outdoor unit is too low.
As shown in FIG. 2, the embodiment of the invention discloses an improved air-cooled condenser, wherein devices such as a double-pipe heat exchanger, a one-way valve, an electromagnetic valve and the like are additionally arranged on a traditional condenser. The double-pipe heat exchanger 9 is arranged on a liquid outlet pipeline of the outdoor heat exchanger 2, a tank body of the double-pipe heat exchanger 9 is communicated with the liquid outlet pipeline of the outdoor heat exchanger 2, and an inner pipe is connected with an air inlet pipe of the outdoor heat exchanger 2; a first electromagnetic valve 6 and a one-way valve 5 are arranged on a pipeline between a liquid outlet of the outdoor heat exchanger 2 and a liquid inlet of a tank body of the double pipe heat exchanger 9; the pipeline connecting the outdoor heat exchanger 2, the first electromagnetic valve 6 and the one-way valve 5 is connected in parallel with a first bypass pipeline, and the first bypass pipeline is provided with a second electromagnetic valve 7; a third electromagnetic valve 8 is arranged between the inner pipe of the double pipe heat exchanger 9 and the air inlet pipe of the outdoor heat exchanger 2.
In a normal temperature cycle environment, the control system 4 collects the pressure value of the pressure sensor 3 (i.e. the high pressure of the refrigeration system), and compares the pressure value with the set value of the high pressure of the control system 4, and the condensation pressure can be adjusted in a proper range by adjusting the rotating speed of the outdoor fan 1 proportionally according to the obtained difference value, or by adjusting the voltage or the frequency. At this time, the second electromagnetic valve 7 and the third electromagnetic valve 8 are in a closed state, and the first electromagnetic valve 6 is in an open state. The refrigerant in the system flows back to the indoor unit heat exchanger through the heat exchanger 2, the one-way valve 5, the first electromagnetic valve 6 and the sleeve heat exchanger 9 in sequence, so that safe and reliable operation of the system is ensured.
The check valve 5 prevents the liquid refrigerant in the double pipe heat exchanger 9 from flowing back to the heat exchanger 2 when the operation of the refrigeration system is stopped, and the refrigerant in the air suction port of the indoor unit compressor is insufficient and cannot be started when the operation is restarted.
When the cold temperature circulation environment arrives, the outdoor unit fan 1 is in the lowest rotating speed state or the stop state, the condensing pressure is still lower than the high pressure set value of the control system 4, the control system 4 sends out a command to close the first electromagnetic valve 6, the second electromagnetic valve 7 is opened to carry out bypass 1 circulation, and the refrigerant high-pressure gas which is not cooled by the heat exchanger 2 directly enters the double-pipe heat exchanger 9, so that the pressure inside the double-pipe heat exchanger 9 is ensured, the condensing pressure of a unit is improved, and the smooth opening of the expansion valve is ensured. Meanwhile, the control system 4 detects the liquid level and temperature sensor 10, if the temperature of the refrigerant is lower than the lowest temperature of the conventional refrigerant by 32 ℃, the third electromagnetic valve 8 is further opened to carry out bypass 2 circulation, and the high-temperature gas refrigeration heats the liquid refrigerant through the flow path of the double-pipe heat exchanger, so that the temperature of the liquid refrigerant is stabilized within the conventional temperature, the solubility of the liquid refrigerant and the lubricating oil is ensured, and the mechanical safety of the compressor is ensured.
Meanwhile, because the first electromagnetic valve 6 is in a closed state, the refrigerant condensed into liquid gradually occupies the internal volume of the heat exchanger 2, the effective heat exchange area of the heat exchanger 2 gradually decreases, the pressure at the pressure sensor 3 gradually rises, and when the pressure rises to the high pressure set by the control system 4, the control system can close the second electromagnetic valve 7 again, and the first electromagnetic valve 6 is opened for normal circulation. Compared with the method for grouping the heat exchangers, the method for grouping the heat exchangers has the advantages that the effective heat exchange area is changed in a mode of changing the liquid storage amount inside the heat exchanger 2, and the method is easier to realize and more economical to realize. In addition, the high pressure is gradually changed in the process of slowly accumulating the liquid storage amount in the heat exchanger 2, so that the problem that the PID control system is poor in dispersion stability due to rapid oscillation of the high pressure collected by the control system 4 is avoided.
The liquid freon in the double pipe heat exchanger 9 should be prevented from being exhausted during the bypass cycle, and the refrigerating effect is lost. There are three countermeasures. The first measure is that the double pipe heat exchanger 9 should select a large capacity tank appropriately according to the size of the refrigeration system, because the refrigerant gas directly enters the double pipe heat exchanger 9 during the bypass circulation, and the liquid refrigerant inside the double pipe heat exchanger 9 should maintain the refrigeration circulation for a period of time. Generally, the tank volume needs to be more than 2 times the internal volume of the heat exchanger 2. The second measure is that when the bypass circulation of the double-pipe heat exchanger 9 is switched to normal circulation, the liquid refrigerant cooled by the heat exchanger 2 passes through the double-pipe heat exchanger 9, and the liquid refrigerant is stored in the double-pipe heat exchanger 9 in the process. The third measure is that the control system 4 can detect the liquid level in the double-pipe heat exchanger 9 in real time through the liquid level sensor 10, and when the liquid level is in a low liquid level state, the control system 4 can switch the bypass circulation to the normal circulation for filling; the liquid level is restored to a safe state.
By adopting the improved air-cooled condenser provided by the embodiment of the invention, the reliable operation and starting of the air conditioner in the machine room in the whole annual wide temperature range can be ensured. The specific control method comprises the following steps:
(1) Detecting the high-pressure of the air-cooled condenser, and if the high-pressure is greater than a pressure set value, operating the fan 1 at full speed; if the high pressure is between the set pressure and the control proportion band, the fan 1 operates in a speed regulation manner; if the high pressure is lower than the set pressure, the blower 1 may be operated at the lowest rotational speed or stopped. The first solenoid valve 6 is opened, and the second solenoid valve 7 and the third solenoid valve 8 are closed.
(2) If the fan 1 is already at the lowest rotational speed or is stopped, the high pressure continues to be lower than the set pressure, the first solenoid valve 6 is closed, and the second solenoid valve 7 is opened for bypass 1 circulation. The third solenoid valve 8 is not operated.
(3) The fan 1 is kept to be operated at the lowest rotating speed or stopped; after the second electromagnetic valve 7 is opened, the detection of the liquid refrigerant temperature 10 is started; if the refrigerant temperature is 32 ℃ higher than the conventional minimum refrigerant temperature, the refrigerant is not operated; if the refrigerant temperature is below this value, the third solenoid valve 8 is opened for the bypass 2 cycle.
(4) The fan 1 is kept to be operated at the lowest rotating speed or stopped; the second solenoid valve 7 is opened and the first solenoid valve 6 is closed. Continuously detecting the liquid refrigerant temperature 10, and if the refrigerant temperature is lower than the conventional minimum refrigerant temperature by 32 ℃, keeping the third electromagnetic valve 8 open; if the refrigerant temperature is higher than the conventional minimum refrigerant temperature of 32 c, the third solenoid valve 8 is closed.
(5) Detecting the high-pressure of the air-cooled condenser, if the high-pressure falls back to be equal to the pressure set value, closing the second electromagnetic valve 7, and opening the first electromagnetic valve 6; the fan 1 continues to keep the lowest rotation speed to run or stops running;
(6) Keeping the second electromagnetic valve 7 closed and the first electromagnetic valve 6 open; and detecting the high-pressure of the air-cooled condenser, and if the high-pressure is between the set pressure and the control proportion band, regulating the speed of the fan 1. If the high pressure is greater than the pressure set point, the fan 1 is operated at full speed.
(7) The liquid level of the double pipe heat exchanger 9 is detected in real time at any time in the above stage, and if the liquid level is greater than the lowest liquid level, no action is performed. If the minimum level is reached, the second solenoid valves 7 and 8 are first closed and the first solenoid valve 6 is opened; if the liquid level is still at the lowest liquid level within 3 minutes, the system is shut down to protect the mechanical safety of the system.
(8) The above-mentioned actions are circularly performed.
If the detected high pressure is far lower than the set pressure when the system is started, the first electromagnetic valve 6 is directly closed, the second electromagnetic valve 7 is opened for bypass 1 circulation, and the subsequent treatment is consistent with the process.
Claims (6)
1. An improved air-cooled condenser comprises an outdoor fan, an outdoor heat exchanger, a pressure sensor and a control system, wherein the pressure sensor is arranged on an air inlet pipeline of the outdoor heat exchanger and used for detecting high-pressure, and the control system is connected with the outdoor fan and the pressure sensor; the method is characterized in that: the condenser also comprises a double pipe heat exchanger arranged on the liquid outlet pipeline of the outdoor heat exchanger, the tank body of the double pipe heat exchanger is communicated with the liquid outlet pipeline of the outdoor heat exchanger, and the inner pipe is connected with the air inlet pipeline of the outdoor heat exchanger; a first electromagnetic valve and a one-way valve are arranged on a pipeline between a liquid outlet of the outdoor heat exchanger and a liquid inlet of the sleeve heat exchanger tank body; the pipeline connecting the outdoor heat exchanger, the first electromagnetic valve and the one-way valve is connected in parallel with a first bypass pipeline, and the first bypass pipeline is provided with a second electromagnetic valve; a third electromagnetic valve is arranged between the inner pipe of the double pipe heat exchanger and the air inlet pipe of the outdoor heat exchanger; the control system is respectively connected with the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve and is used for outputting control signals to the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve.
2. The improved air-cooled condenser of claim 1, wherein: a liquid level and temperature sensor is arranged in the sleeve type heat exchanger tank body; the control system is connected with the liquid level and temperature sensor and is used for receiving the detected liquid level and temperature signals.
3. The improved air-cooled condenser of claim 1, wherein: the tank volume of the double pipe heat exchanger is more than 2 times of the internal volume of the outdoor heat exchanger.
4. The improved air-cooled condenser of claim 1, wherein: the double pipe heat exchanger is located outdoors.
5. The method for controlling an improved air-cooled condenser according to any one of claims 1 to 4, wherein: the method comprises the following steps:
when the high-pressure of the air-cooled condenser is larger than a set value, the first electromagnetic valve is opened, and the second electromagnetic valve and the third electromagnetic valve are closed;
when the first electromagnetic valve is opened and the second electromagnetic valve is closed, if the high-pressure is larger than the pressure set value, the fan runs at full speed, and if the high-pressure is between the set value and the control proportion band, the fan runs at speed regulation;
when the first electromagnetic valve is opened and the second electromagnetic valve is closed, if the high-pressure is lower than a set value, controlling the fan to run at the lowest rotating speed or stop running, and if the high-pressure is continuously lower than the set value, closing the first electromagnetic valve and opening the second electromagnetic valve;
when the first electromagnetic valve is closed and the second electromagnetic valve is opened, if the temperature of the refrigerant in the double-pipe heat exchanger tank body is lower than the conventional minimum temperature of the refrigerant, the third electromagnetic valve is opened; if the refrigerant temperature is higher than the conventional minimum refrigerant temperature, closing the third solenoid valve;
and when the first electromagnetic valve is closed and the second electromagnetic valve is opened, if the high-pressure fall back is equal to the pressure set value, the second electromagnetic valve is closed, the first electromagnetic valve is opened, and the fan continues to keep the lowest rotating speed to operate or stops operating.
6. The method for controlling an improved air-cooled condenser according to claim 5, wherein: further comprises:
if the double pipe heat exchanger reaches the lowest liquid level, the second electromagnetic valve and the third electromagnetic valve are closed, and the first electromagnetic valve is opened; if the set time is continued and the liquid level is still in the lowest liquid level state, the system is stopped.
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| CN208349630U (en) * | 2018-04-17 | 2019-01-08 | 南京佳力图机房环境技术股份有限公司 | A kind of modified air-cooled condenser |
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2018
- 2018-04-17 CN CN201810340744.6A patent/CN108469134B/en active Active
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| JP2006317024A (en) * | 2005-05-10 | 2006-11-24 | Denso Corp | Refrigerating device |
| CN101070996A (en) * | 2006-05-12 | 2007-11-14 | 上海久源新能源科技有限公司 | Heat pump water heater with low temeprature environment fast start device |
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