CN110966813A - Condensation pressure control method of air-cooled water chiller under wide temperature working condition - Google Patents
Condensation pressure control method of air-cooled water chiller under wide temperature working condition Download PDFInfo
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- CN110966813A CN110966813A CN201910936137.0A CN201910936137A CN110966813A CN 110966813 A CN110966813 A CN 110966813A CN 201910936137 A CN201910936137 A CN 201910936137A CN 110966813 A CN110966813 A CN 110966813A
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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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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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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
- F25B2600/00—Control issues
- F25B2600/17—Control issues by controlling the pressure of the condenser
Abstract
The invention relates to the technical field of air-cooled water coolers, in particular to a condensation pressure control method of an air-cooled water cooler under wide-temperature working conditions, which enables the air-cooled water cooler to stably run under the wide-temperature working conditions, wherein the air-cooled water cooler under the wide-temperature working conditions comprises a compressor, a condensation system, an expansion valve and an evaporator which are sequentially connected into a refrigeration cycle system, the condensation system comprises a plurality of condensers connected in parallel and a condensation fan for forcing the condensers to perform convective heat transfer, and the control method comprises the following steps: s1, setting the operating temperature working condition of the air-cooled water chilling unit; s2, detecting the ambient temperature, judging the current operation mode of the air-cooled water chilling unit according to the comparison result of the ambient temperature and the operation temperature working condition, and controlling a certain number of condensers to be started; and S3, detecting the condensation pressure of the refrigeration cycle system, and controlling the on-off of a condensation fan or controlling the on-off and the operation frequency of the condensation fan according to the current operation mode of the air-cooled water chilling unit and the condensation pressure.
Description
Technical Field
The invention relates to the technical field of air-cooled water coolers, in particular to a condensation pressure control method of an air-cooled water cooler under a wide-temperature working condition.
Background
The existing air-cooled water chilling unit for the central chilled water system of the passive nuclear power plant requires refrigeration operation all the year round and can meet the refrigeration requirement under the wide-temperature working condition of +46 ℃ to-40 ℃. The well known air-cooled water chilling unit discharges indoor heat to the environment through condenser and ambient air heat exchange, and when ambient temperature rises or reduces, condensing pressure also can rise or reduce, in order to guarantee that the condensing pressure of system is in reasonable scope, needs the corresponding increase or reduction of condensation heat transfer area also, just can guarantee air-cooled water chilling unit normal operating.
In the prior art, an adaptable air-cooled water chilling unit with an ambient temperature range of +46 ℃ to-40 ℃ comprises a condensing fan, a condenser linked with a compressor, and a plurality of independently adjustable condensers, wherein when the unit is operated, the independently adjustable condensers are turned on or off according to a condensing pressure value of a system, for example, a first independently adjustable condenser is turned on when the condensing pressure of the system rises to a certain set value, a second independently adjustable condenser is turned on when the condensing pressure of the system continues to rise and rises to a certain set value, and so on until all condensers are turned on; and when the condensing pressure of the system is reduced to a certain set value, the first independently adjustable condenser is closed, and the like is repeated until all the plurality of independently adjustable condensers are closed. The number of the condensers is changed according to the change of the condensation pressure so as to achieve the purpose of adjusting the condensation area, and meanwhile, the air quantity is adjusted by depending on the condensation fan in the process.
The prior art changes the condensing area by monitoring the condensing pressure of the system to maintain the normal operation of the refrigeration system. However, various parameters of the refrigeration system in the stable operation process, such as high pressure, low pressure, condensing pressure, etc., are stable, and if one of the parameters changes suddenly, other parameters may change, thereby affecting the stability of the refrigeration system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a condensation pressure control method of an air-cooled water chiller under a wide-temperature working condition, so that the air-cooled water chiller can keep a refrigerating system to stably run under the wide-temperature working condition.
The technical scheme adopted by the invention is as follows:
a condensation pressure control method of an air-cooled water chiller under wide-temperature working conditions is used for controlling the condensation pressure of the air-cooled water chiller under wide-temperature working conditions, the air-cooled water chiller under wide-temperature working conditions comprises a compressor, a pressure maintaining valve, a condensation system, an expansion valve and an evaporator which are sequentially connected into a refrigeration cycle system, the condensation system comprises a plurality of condensers and a condensation fan for forcing the condensers to conduct heat convection, and the control method comprises the following steps:
s1, setting the operating temperature working condition of the air-cooled water chilling unit;
s2, detecting the ambient temperature, judging the current operation mode of the air-cooled water chilling unit according to the comparison result of the ambient temperature and the operation temperature working condition, and controlling a certain number of condensers to be started;
and S3, detecting the condensation pressure of the refrigeration cycle system, and controlling the on-off of a condensation fan or controlling the on-off and the operation frequency of the condensation fan according to the current operation mode of the air-cooled water chilling unit and the condensation pressure.
The control method is adopted to control the plurality of condensers and the condensing fans to work, firstly, the operating temperature working condition of the unit is set, secondly, the environment temperature is detected, the current operating mode of the unit is judged according to the comparison result of the environment temperature and the operating temperature working condition, then, the opening number of the condensers is controlled according to the operating mode to adjust the heat exchange area of the condensing system, and meanwhile, the condensing fans are controlled to carry out auxiliary adjustment according to the condensing pressure.
Further, the operating temperature working conditions comprise a high-temperature working condition, a medium-temperature working condition and a low-temperature working condition;
the operation modes comprise a high-temperature operation mode, a medium-temperature operation mode and a low-temperature operation mode;
the step S2 includes:
judging whether the ambient temperature falls into a high-temperature working condition, if so, entering a high-temperature operation mode, and controlling all condensers to be started;
judging whether the ambient temperature falls into a medium-temperature working condition, if so, entering a medium-temperature operation mode, and controlling all condensers to be started;
and judging whether the ambient temperature falls into a low-temperature working condition, if so, entering a low-temperature operation mode, controlling 2/3 of the number of all condensers and starting the condensers which are rounded upwards.
The operation temperature of the unit is set, the operation mode of the unit is divided into a high-temperature operation mode, a medium-temperature operation mode and a low-temperature operation mode according to different operation temperature working conditions, the operation mode of the unit is judged according to the comparison result of the ambient temperature and the operation temperature, and then the opening of the condensers with fixed quantity is set according to the operation modes of different temperature zones, so that the heat exchange area is kept unchanged when the system operates, and the stable operation of the refrigerating system is ensured.
Further, the high-temperature working condition is a working condition that the ambient temperature is greater than 18 ℃, the medium-temperature working condition is a working condition that the ambient temperature is greater than-15 ℃ and less than or equal to 18 ℃, and the low-temperature working condition is a working condition that the ambient temperature is less than or equal to-15 ℃.
According to the actual operation condition of the unit, the operation temperature working condition of the unit is reasonably set to be three temperature zone working conditions, the operation mode of the unit is judged according to the comparison result of the operation temperature and the environment temperature, and then the opening number of the condensers is regulated and controlled.
Further, the step S3 includes:
s31, presetting a stop point P1 and a start point P2 of the condensing fan in different operation modes, wherein the stop point P1 of the condensing fan in each operation mode is smaller than the start point P2 of the condensing fan in each corresponding operation mode;
s32, comparing the condensation pressure P with the starting point P2 of the condensation fan, and controlling whether the condensation fan is started or not according to whether the condensation pressure P is greater than or equal to the starting point P2 of the condensation fan or not;
s33, comparing the condensation pressure P with the stop point P1 of the condensation fan, and controlling whether the condensation fan is closed or not according to whether the condensation pressure P is less than or equal to the stop point P1 of the condensation fan or not.
When the condensing pressure P is greater than or equal to the starting point P2 of the condensing fan, starting the condensing fan; when the condensing pressure P is less than or equal to the condensing fan stop point P1, the condensing fan is turned off. By setting a stop point P1 and a start point P2 of the condensing fan, the on-off and running frequency of the condensing fan are controlled, and the operation of the condensing fan is automatically regulated according to the condensing pressure of the system.
Further, the step S32 includes:
in the high-temperature operation mode, controlling whether the condensation fan starts to operate at an operation frequency F0 according to whether the condensation pressure P is greater than or equal to the starting point P2 of the condensation fan, wherein the operation frequency F0 is the lowest operation frequency of the condensation fan;
in the medium-temperature operation mode and the low-temperature operation mode, whether the condensation fan starts to operate at an operation frequency F2 is controlled according to whether the condensation pressure P is greater than or equal to the condensation fan starting point P2, wherein the operation frequency F2 is greater than the operation frequency F0 and less than the operation frequency F1, and the operation frequency F1 is the highest operation frequency of the condensation fan.
Under different warm area operation modes, according to the start-up operating frequency difference of condensation fan, realize condensing system's heat transfer rate and condensation pressure's change phase-match to the rate of change of control condensation pressure avoids appearing the condition of condensation pressure parameter rapid change, guarantees condensing system's even running.
Further, a starting point P2 of the condensing fan in the medium-temperature operation mode is greater than a starting point P2 of the condensing fan in the low-temperature operation mode, and a starting point P2 of the condensing fan in the low-temperature operation mode is greater than a starting point P2 of the condensing fan in the high-temperature operation mode.
The condensing pressure starting points are different under the operation modes of different temperature areas, the requirement of the starting stage for quick rise of the condensing pressure is met, the required starting operation frequency is adjusted according to the change of the condensing pressure, and the stable operation of the system is ensured.
Further, the step S3 further includes:
presetting a full-frequency point P5 of the condensing fan in different operation modes, wherein the full-frequency point P5 of the condensing fan in each operation mode is larger than a starting point P2 of the condensing fan in each corresponding operation mode;
when the condensation pressure P is greater than or equal to the condensation fan starting point P2, judging whether the condensation pressure P reaches the condensation fan full frequency point P5;
if yes, controlling the condensation fan to operate at an operation frequency F1;
if not, continuously controlling the operation frequency of the condensing fan to change along with the change of the condensing pressure P.
Under different temperature zone operating modes, the maximum operating frequency that the operating frequency of condensing fan can reach is F1, and system condensation pressure P equals condensing fan full frequency point P5 this moment, and under different temperature zone operating modes, the condensing fan reaches the condensation pressure P difference that maximum operating frequency corresponds.
Further, the step of continuously controlling the operation frequency of the condensation fan to change along with the change of the condensation pressure P comprises the following steps:
presetting a rising frequency point P6 of a condensing fan in different operation modes, and when the condensing pressure P is equal to the rising frequency point P6 of the condensing fan, operating the condensing fan at an operation frequency F0;
forming an operation control line of the condensing fan according to the operation frequency F0 of the condensing fan corresponding to the condensing fan rising frequency point P6 and the operation frequency F1 of the condensing fan corresponding to the condensing fan full frequency point P5;
according to the operation control line, calculating the current operation frequency F of the condensing fan according to the condensing pressure P;
controlling the condensing fan to operate at an operating frequency F.
With the increase of the condensation pressure, the operation frequency of the condensation fan is increased, and the operation frequency F of the condensation fan is defined according to an operation control line formed by a connection line of the operation frequency F0 corresponding to the condensation fan rising frequency point P6 and the operation frequency F1 corresponding to the condensation fan full frequency point P5. And the operation frequency F of the condensing fan corresponding to the condensing pressure P can be quantitatively calculated according to the operation control line.
Further, the step of calculating the current operating frequency F of the condensing fan according to the condensing pressure P includes:
according to
And calculating the current operating frequency F of the condensing fan.
And further clearly defining an operation control line of the operation frequency of the condensing fan.
Further, in the high-temperature operation mode, the condensing fan rising frequency point P6 is equal to the condensing fan starting point P2, and in the medium-temperature operation mode and the low-temperature operation mode, the condensing fan rising frequency point P6 is smaller than the condensing fan starting point P2.
The operating frequency that condensation fan rises frequency point P6 and corresponds the condensation fan is F0, under the high temperature operation mode promptly, condensation fan starts operating frequency and equals F0, under medium temperature operation mode and the low temperature operation mode, the start-up operating frequency of condensation fan is greater than F0, because under medium temperature operation mode and the low temperature operation mode, the condensation pressure of system rises more slowly, so need promote condensation pressure fast, match the change of system condensation pressure through the start-up operating frequency of condensation fan and ensure refrigerating system normal operating.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a condensation pressure control method of an air-cooled water chiller under wide temperature working conditions, which is characterized in that a set runs a fixed number of condensers in different temperature zone running modes, and the frequency conversion auxiliary adjustment of a condensation fan is carried out through the condensation pressure, so that the condensation area of the set is not changed in the running process, the condensation pressure is not suddenly changed, the condition of rapid change of condensation pressure parameters is avoided, and the air-cooled water chiller can adapt to the refrigeration running under the wide temperature working conditions and can keep the refrigeration system to stably run under the wide temperature working conditions.
2. The starting frequency of the condensing fan in the medium-temperature running mode and the low-temperature running mode is set to be greater than that in the high-temperature running mode, so that the condensing pressure in the system starting stage in the medium-temperature running mode and the low-temperature running mode is quickly increased, and the stable running of a condensing system is ensured.
3. Defining operation control line of condensing fan according to operation frequency formula
And quantitatively calculating the operating frequency F of the condensing fan.
Drawings
FIG. 1 is a system schematic of an embodiment of the present invention;
FIG. 2 is a graph illustrating the operation of a condensing fan in a high temperature operation mode according to an embodiment of the present invention;
FIG. 3 is a graph showing the operation curves of the condensing fan in the medium-temperature operation mode according to the embodiment of the present invention;
fig. 4 is an operation curve of the condensing fan in the low temperature operation mode according to the embodiment of the present invention.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, the air-cooled chiller under wide temperature working condition provided by the present invention comprises a compressor 1, a pressure maintaining valve 2, an electromagnetic valve 3, a condensing system, a one-way valve 6, a pressure sensor 7, a liquid reservoir 8, a drying filter 9, an expansion valve 10 and an evaporator 11 which are sequentially connected to form a refrigeration cycle system, wherein the condensing system comprises a plurality of condensers 5 and a condensing fan 4 for forcing the condensers to perform heat convection, a refrigerant inlet of the condensers is connected with an exhaust port of the compressor 1 through the electromagnetic valve 3, and the working process of the refrigeration cycle system is as follows: when the compressor 1 starts to work, the pressure maintaining valve 2 is opened or closed according to the high-low pressure difference of the unit to maintain the oil supply pressure difference of the compressor, at the moment, the condensing system controls the condenser and the condensing fan to start to work according to the control method of the invention, the gaseous refrigerant from the exhaust port of the compressor 1 is changed into liquid refrigerant after heat exchange of the condensing system, the one-way valve 6 prevents the system refrigerant from entering the condenser which does not participate in adjusting the heat exchange area of the condensing system, the loss of the condensing pressure is avoided, after the liquid refrigerant flows into the liquid storage device 8, the liquid refrigerant from the liquid storage device 8 is throttled into the refrigerant in a gas-liquid mixed state by the expansion valve 10 after impurities and moisture are removed by the drying filter 9, then, the refrigerant enters the evaporator 11 to cool the chilled water, and the refrigerant in a gas-liquid mixed state is heated into a gaseous refrigerant and then returns to the compressor 1, thereby completing a refrigeration cycle.
The control method comprises the following steps:
s1, setting the operating temperature working condition of the air-cooled water chilling unit;
s2, detecting the ambient temperature, judging the current operation mode of the air-cooled water chilling unit according to the comparison result of the ambient temperature and the operation temperature working condition, and controlling a certain number of condensers to be started;
s3, detecting the condensation pressure of the refrigeration cycle system, and controlling the on-off of a condensation fan or controlling the on-off and the operation frequency of the condensation fan according to the current operation mode of the air-cooled water chilling unit and the condensation pressure
Further, the operating temperature working conditions comprise a high-temperature working condition, a medium-temperature working condition and a low-temperature working condition;
the operation modes comprise a high-temperature operation mode, a medium-temperature operation mode and a low-temperature operation mode;
the step S2 includes:
judging whether the ambient temperature falls into a high-temperature working condition, if so, entering a high-temperature operation mode, and controlling all condensers to be started;
judging whether the ambient temperature falls into a medium-temperature working condition, if so, entering a medium-temperature operation mode, and controlling all condensers to be started;
and judging whether the ambient temperature falls into a low-temperature working condition, if so, entering a low-temperature operation mode, controlling 3/4 of the number of all condensers and starting the condensers which are rounded upwards.
Further, the high-temperature working condition is a working condition that the ambient temperature is greater than 18 ℃, the medium-temperature working condition is a working condition that the ambient temperature is greater than-15 ℃ and less than or equal to 18 ℃, and the low-temperature working condition is a working condition that the ambient temperature is less than or equal to-15 ℃.
In this embodiment, the number of condensers is 4, and the number of condensers turned on according to the control method of the present invention is shown in table 1:
TABLE 1 number of condensers started under different operating temperature conditions
From table 1, three operation modes of the unit are preset: a high-temperature operation mode, a medium-temperature operation mode and a low-temperature operation mode, a temperature sensor is adopted to detect the ambient temperature,
when the ambient temperature falls into the high-temperature working condition of the unit, the unit enters a high-temperature operation mode, all condensers in the unit are started at the moment, and 4 condensers are started;
when the environmental temperature falls into the medium-temperature working condition of the unit, the unit enters a medium-temperature operation mode, all condensers in the unit are started at the moment, and 4 condensers are started;
when the ambient temperature falls into the low-temperature working condition of the unit, the unit enters a low-temperature operation mode, at the moment, 3/4 which is the total number of condensers in the unit and is rounded up is started, namely 3 condensers are started.
According to the control method adopted by the invention, the wide-temperature working condition is divided into three temperature zone working conditions, and the condensers with fixed number are operated in each temperature zone working condition, so that the condensing area is not changed in the unit operation process, the condition that the condensing pressure is suddenly changed is avoided, and the stable operation of the refrigerating system under the wide-temperature working condition is ensured.
Fig. 2 is a graph showing the operating frequency of the condensing fan in the high temperature operation mode.
The method for controlling the opening and closing and the operation frequency of the condensing fan according to the condensing pressure comprises the following steps:
presetting a stop point P1 of a condensing fan to be 8bar and a starting point P2 of the condensing fan to be 8.3bar in a high-temperature operation mode;
presetting a condensation fan rising frequency point P6 of 8.3bar and a condensation fan full frequency point P5 of 13bar in a high-temperature operation mode, wherein the operation frequency of the condensation fan rising frequency point P6 corresponding to a condensation fan is F0 of 10HZ, and the operation frequency of the condensation fan full frequency point P5 corresponding to a condensation fan is F1 of 50 HZ;
detecting the system condensation pressure P according to a condensation pressure sensor;
comparing the condensation pressure P with a condensation fan starting point P2 which is 8.3bar, and if the condensation pressure is more than P or equal to the condensation fan starting point P2 which is 8.3bar, starting the condensation fan to operate at the lowest operation frequency F0 which is 10 HZ;
along with the condensation pressure of the system is gradually increased, the operating frequency of the condensation fan is also gradually increased, wherein a connecting line between operating frequency points corresponding to a condensation fan rising frequency point P6 (8.3 bar) and a condensation fan full frequency point P5 (13 bar) is an operating control line of the condensation fan, and the operating frequency of the condensation fan is calculated according to the operating control line
Substituting the condensation pressure P to obtain the operating frequency F of the current condensation fan, and when the system condensation pressure P reaches the full frequency point P5 of the condensation fan to 13bar, the operating frequency of the condensation fan reaches the maximum operating frequency F1 to 50 HZ;
and comparing the condensing pressure P with the stop point P1 of the condensing fan to 8bar, if the condensing pressure P is less than or equal to the stop point P1 of the condensing fan to 8bar, stopping the operation of the condensing fan, and otherwise, operating the condensing fan at the original frequency.
Fig. 3 is a graph showing an operating frequency of the condensing fan in the medium temperature operation mode.
The method for controlling the opening and closing and the operation frequency of the condensing fan according to the condensing pressure comprises the following steps:
presetting a stop point P1 of a condensing fan to be 8bar and a start point P2 of the condensing fan to be 11.1bar in a medium-temperature operation mode;
presetting a condensation fan rising frequency point P6 of 9.5bar and a condensation fan full frequency point P5 of 16bar in a medium temperature operation mode, wherein the operation frequency of the condensation fan rising frequency point P6 corresponding to a condensation fan is F0 of 10HZ, and the operation frequency of the condensation fan full frequency point P5 corresponding to a condensation fan is F1 of 50 HZ;
detecting the condensing pressure P of the system according to a condensing pressure sensor;
comparing the condensation pressure P with a condensation fan starting point P2 of 11.1bar, and if the condensation pressure P is greater than or equal to the condensation fan starting point P2 of 11.1bar, starting the condensation fan to operate at an operating frequency F2, wherein the operating frequency F2 is greater than the lowest operating frequency F0 and less than the highest operating frequency F1;
along with the gradual increase of the condensing pressure of the system, the operating frequency of the condensing fan is gradually increased, wherein a connecting line between the corresponding operating frequency points of the rising frequency point P6 and the full frequency point P5 of the condensing fan is an operating control line of the condensing fan, and the operating frequency of the condensing fan is calculated according to the operating control line
Substituting the condensation pressure P to obtain the operating frequency F of the current condensation fan, and when the system condensation pressure P reaches the full frequency point P5 of the condensation fan, enabling the operating frequency of the condensation fan to reach the maximum operating frequency F1 which is 50 HZ;
and comparing the condensing pressure P with the stop point P1 of the condensing fan to 8bar, if the condensing pressure P is less than or equal to the stop point P1 of the condensing fan to 8bar, stopping the operation of the condensing fan, and otherwise, operating the condensing fan at the original frequency.
Fig. 4 is a graph showing the operating frequency of the condensing fan in the low temperature operation mode.
The method for controlling the opening and closing and the operation frequency of the condensing fan according to the condensing pressure comprises the following steps:
presetting a stop point P1 of a condensing fan to be 8bar and a start point P2 of the condensing fan to be 10.5bar in a low-temperature operation mode;
presetting a condensation fan rising frequency point P6 of 9.5bar and a condensation fan full frequency point P5 of 16bar in a low-temperature operation mode, wherein the operation frequency of the condensation fan rising frequency point P6 corresponding to a condensation fan is F0 of 10HZ, and the operation frequency of the condensation fan full frequency point P5 corresponding to a condensation fan is F1 of 50 HZ;
detecting the condensing pressure P of the system according to a condensing pressure sensor;
comparing the condensation pressure P with a condensation fan starting point P2, if the condensation pressure is greater than P or equal to the condensation fan starting point P2, starting the condensation fan to operate at an operating frequency F3, wherein the operating frequency F3 is greater than a lowest operating frequency F0 and less than a highest operating frequency F1, and the operating frequency F3 is less than an operating frequency F2;
along with the gradual increase of the condensing pressure of the system, the operating frequency of the condensing fan is gradually increased, wherein a connecting line between the corresponding operating frequency points of the rising frequency point P6 and the full frequency point P5 of the condensing fan is an operating control line of the condensing fan, and the operating frequency of the condensing fan is calculated according to the operating control line
Substituting the condensation pressure P to obtain the operating frequency F of the current condensation fan, and when the system condensation pressure P reaches the full frequency point P5 of the condensation fan, enabling the operating frequency of the condensation fan to reach the maximum operating frequency F1 which is 50 HZ;
and comparing the condensing pressure P with the stop point P1 of the condensing fan to 8bar, if the condensing pressure P is less than or equal to the stop point P1 of the condensing fan to 8bar, stopping the operation of the condensing fan, and otherwise, operating the condensing fan at the original frequency.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. The condensation pressure control method of the wide-temperature working condition air-cooled water chiller is used for controlling the condensation pressure of the wide-temperature working condition air-cooled water chiller, the wide-temperature working condition air-cooled water chiller comprises a compressor, a condensation system, an expansion valve and an evaporator which are sequentially connected into a refrigeration cycle system, the condensation system comprises a plurality of condensers which are connected in parallel and a condensation fan used for forcing the condensers to conduct heat convection, and the condensation pressure control method is characterized by comprising the following steps:
s1, setting the operating temperature working condition of the air-cooled water chilling unit;
s2, detecting the ambient temperature, judging the current operation mode of the air-cooled water chilling unit according to the comparison result of the ambient temperature and the operation temperature working condition, and controlling a certain number of condensers to be started;
and S3, detecting the condensation pressure of the refrigeration cycle system, and controlling the on-off of a condensation fan or controlling the on-off and the operation frequency of the condensation fan according to the current operation mode of the air-cooled water chilling unit and the condensation pressure.
2. The method for controlling the condensing pressure of the air-cooled water chiller under the wide temperature working condition according to claim 1, wherein the operating temperature working conditions comprise a high temperature working condition, a medium temperature working condition and a low temperature working condition;
the operation modes comprise a high-temperature operation mode, a medium-temperature operation mode and a low-temperature operation mode;
the step S2 includes:
judging whether the ambient temperature falls into a high-temperature working condition, if so, entering a high-temperature operation mode, and controlling all condensers to be started;
judging whether the ambient temperature falls into a medium-temperature working condition, if so, entering a medium-temperature operation mode, and controlling all condensers to be started;
and judging whether the ambient temperature falls into a low-temperature working condition, if so, entering a low-temperature operation mode, controlling 3/4 of the number of all condensers and starting the condensers which are rounded upwards.
3. The method for controlling the condensation pressure of the wide-temperature working condition air-cooled water chiller according to claim 2, wherein the high-temperature working condition is a working condition that the ambient temperature is greater than 18 ℃, the medium-temperature working condition is a working condition that the ambient temperature is greater than-15 ℃ and less than or equal to 18 ℃, and the low-temperature working condition is a working condition that the ambient temperature is less than or equal to-15 ℃.
4. The method as claimed in claim 1, wherein the step S3 includes:
s31, presetting a stop point P1 and a start point P2 of the condensing fan in different operation modes, wherein the stop point P1 of the condensing fan in each operation mode is smaller than the start point P2 of the condensing fan in each corresponding operation mode;
s32, comparing the condensation pressure P with the starting point P2 of the condensation fan, and controlling whether the condensation fan is started or not according to whether the condensation pressure P is greater than or equal to the starting point P2 of the condensation fan or not;
s33, comparing the condensation pressure P with the stop point P1 of the condensation fan, and controlling whether the condensation fan is closed or not according to whether the condensation pressure P is less than or equal to the stop point P1 of the condensation fan or not.
5. The method as claimed in claim 4, wherein the step S32 includes:
in the high-temperature operation mode, controlling whether the condensation fan starts to operate at an operation frequency F0 according to whether the condensation pressure P is greater than or equal to the starting point P2 of the condensation fan, wherein the operation frequency F0 is the lowest operation frequency of the condensation fan;
and in the medium-temperature operation mode and the low-temperature operation mode, controlling whether the condensation fan starts to operate at an operation frequency F2 according to whether the condensation pressure P is greater than or equal to a condensation fan starting point P2, wherein the operation frequency F2 is greater than the operation frequency F0 and less than the operation frequency F1, and the operation frequency F1 is the highest operation frequency of the condensation fan.
6. The method as claimed in claim 4 or 5, wherein the starting point P2 of the condensing fan in the medium temperature operation mode is greater than the starting point P2 of the condensing fan in the low temperature operation mode, and the starting point P2 of the condensing fan in the low temperature operation mode is greater than the starting point P2 of the condensing fan in the high temperature operation mode.
7. The method as claimed in claim 4, wherein the step S3 further includes:
presetting a full-frequency point P5 of the condensing fan in different operation modes, wherein the full-frequency point P5 of the condensing fan in each operation mode is larger than a starting point P2 of the condensing fan in each corresponding operation mode;
when the condensation pressure P is greater than or equal to the condensation fan starting point P2, judging whether the condensation pressure P reaches the condensation fan full frequency point P5;
if yes, controlling the condensation fan to operate at an operation frequency F1;
if not, continuously controlling the operation frequency of the condensing fan to change along with the change of the condensing pressure P.
8. The method for controlling the condensation pressure of the air-cooled water chiller under the wide temperature working condition according to claim 7, wherein the step of continuously controlling the operation frequency of the condensation fan to change along with the change of the condensation pressure P comprises the following steps:
presetting a rising frequency point P6 of a condensing fan in different operation modes, and when the condensing pressure P is equal to the rising frequency point P6 of the condensing fan, operating the condensing fan at an operation frequency F0;
forming an operation control line of the condensing fan according to the operation frequency F0 of the condensing fan corresponding to the condensing fan rising frequency point P6 and the operation frequency F1 of the condensing fan corresponding to the condensing fan full frequency point P5;
calculating the current operating frequency F of the condensing fan according to the condensing pressure P according to the operating control line;
controlling the condensing fan to operate at an operating frequency F.
9. The method for controlling the condensation pressure of the air-cooled water chiller under the wide temperature working condition according to claim 8, wherein the step of calculating the current operating frequency F of the condensation fan according to the condensation pressure P comprises the following steps:
according to
And calculating the current operating frequency F of the condensing fan.
10. The method as claimed in claim 8 or 9, wherein the condensing fan rising frequency point P6 is equal to the condensing fan starting point P2 in the high temperature operation mode, and the condensing fan rising frequency point P6 is smaller than the condensing fan starting point P2 in the medium temperature operation mode and the low temperature operation mode.
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| CN111750506A (en) * | 2020-07-06 | 2020-10-09 | 深圳市英维克科技股份有限公司 | Control system and control method of condensing fan |
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| DE102022127315A1 (en) | 2022-10-18 | 2024-04-18 | Hefei Hualing Co., Ltd. | Cooling unit for a cooling system |
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