CN117781493A - Fluorine pump pressure refrigeration system and control method and control system thereof - Google Patents
Fluorine pump pressure refrigeration system and control method and control system thereof Download PDFInfo
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- CN117781493A CN117781493A CN202311800095.0A CN202311800095A CN117781493A CN 117781493 A CN117781493 A CN 117781493A CN 202311800095 A CN202311800095 A CN 202311800095A CN 117781493 A CN117781493 A CN 117781493A
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Abstract
The application provides a fluorine pump pressure refrigeration system, a control method and a control system thereof, wherein the control method of the fluorine pump pressure refrigeration system is in a compressor independent operation mode: closing the fluorine pump and starting the compressor; when the indoor and outdoor temperature difference is larger than the fluorine pump starting preset temperature difference and the indoor temperature is smaller than the fluorine pump starting preset temperature value, entering a mixed operation mode; in the hybrid mode of operation: starting a fluorine pump; judging that the real-time operation parameters of the system are in a preset target range, and if the real-time operation parameters of the system are in the preset target range, entering a single operation mode of the fluorine pump; in the fluorine pump alone operation mode: closing the compressor; and when the indoor and outdoor temperature difference is smaller than the fluorine pump starting preset temperature difference or the indoor temperature is larger than the compressor starting preset temperature value, entering a compressor independent operation mode. According to the control method and control system of the fluorine pump pressure refrigeration system and the fluorine pump pressure refrigeration system, the stability of the cooling capacity in the mode switching process can be guaranteed, the operation reliability of the system is improved, and the operation mode is switched in time.
Description
Technical Field
The application relates to the technical field of refrigeration equipment, in particular to a control method and a control system of a fluorine pump pressure refrigeration system and the fluorine pump pressure refrigeration system.
Background
With the rapid development of technologies such as big data and cloud computing, the scale and the number of data centers are continuously increased, and the problem of high energy consumption is increasingly prominent. The data center cooling system has the characteristic of 24 hours uninterrupted cooling in 365 days, and natural cooling is used for replacing compression refrigeration, so that the operation energy consumption of the data center cooling system can be obviously reduced, and the energy utilization rate is improved. Compared with the traditional compressor refrigerating and air-conditioning system, the fluorine pump pressure refrigerating system has the characteristic of frequent switching between a compressor mode and a fluorine pump mode, so that a natural cold source is utilized as much as possible on the premise of ensuring the refrigerating capacity, and the purposes of energy conservation and emission reduction are achieved.
The mode switching control logic of the fluorine pump compression refrigeration system is not only concerned with the operational reliability of the air conditioning system, but also can significantly affect the security of the data center server. The mode switching control logic of the current common fluorine pump compression refrigeration system is as follows: the compressor operation mode is switched to the fluorine pump operation mode logic that the compressor is turned off and then the fluorine pump is turned on; the compressor operation mode is switched by the fluorine pump operation mode logic to turn off the fluorine pump and then turn on the compressor.
In the process of implementing the present application, the inventors found that at least the following problems exist in the prior art:
the temperature fluctuation of a machine room is too large in the mode switching process of the fluorine pump cooling system, so that the operation safety of a server is reduced.
Disclosure of Invention
Based on the above, the application provides a control method and a control system of a fluorine pump pressure refrigeration system and the fluorine pump pressure refrigeration system, so as to solve the problem of overlarge temperature fluctuation in the mode switching process of the fluorine pump pressure refrigeration system in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the present application provides a control method of a fluorine pump pressure refrigeration system, the control method controlling the fluorine pump pressure refrigeration system to operate in a compressor alone operation mode or a hybrid operation mode or a fluorine pump alone operation mode;
in the compressor alone operation mode, the control method of the fluorine pump pressure refrigeration system includes:
closing the fluorine pump and starting the compressor;
acquiring indoor temperature and indoor and outdoor temperature difference values;
judging whether the indoor and outdoor temperature difference is larger than a fluorine pump starting preset temperature difference and whether the indoor temperature is smaller than the fluorine pump starting preset temperature value, if so, entering the mixed operation mode;
in the hybrid operation mode, the control method of the fluorine pump pressure refrigeration system comprises the following steps:
starting the fluorine pump in the state that the compressor is started;
acquiring real-time operation parameters of a system;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering an independent operation mode of the fluorine pump;
in the fluorine pump independent operation mode, the control method of the fluorine pump pressure refrigeration system comprises the following steps:
starting a fluorine pump and closing a compressor;
acquiring indoor temperature and indoor and outdoor temperature difference values;
judging whether the indoor and outdoor temperature difference is smaller than the preset temperature difference for starting the fluorine pump or whether the indoor temperature is larger than the preset temperature value for starting the compressor, and if so, entering the single operation mode of the compressor.
Optionally, the starting the fluorine pump in the compressor on state further includes: and starting the external fan.
Optionally, the system real-time operating parameters include any one of a real-time pressure ratio, a real-time condensing pressure, or a real-time condenser outlet liquid tube temperature.
Optionally, when the system real-time operating parameters include the real-time pressure ratio,
the acquiring system real-time operation parameters specifically comprises the following steps: acquiring real-time condensing pressure and real-time evaporating pressure, and calculating to obtain the real-time pressure ratio;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the real-time pressure ratio is larger than the maximum value of the pressure ratio target range, the rotating speed of the external fan is increased; if the real-time pressure ratio is smaller than the minimum value of the pressure ratio target range, the rotating speed of the external fan is reduced; and if the real-time pressure ratio is within the pressure ratio target range, keeping the current rotating speed of the external fan unchanged, recording the duration time of the real-time pressure ratio within the pressure ratio target range, and executing the independent operation mode of the fluorine pump when the duration time reaches a duration time target value.
Optionally, when the system operating parameters include the real-time condensing pressure,
the acquiring system real-time operation parameters specifically comprises the following steps: acquiring real-time condensing pressure and real-time evaporating pressure, and calculating a condensing pressure target range according to the real-time evaporating pressure and a pressure ratio target range;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the real-time condensing pressure is larger than the maximum value of the condensing pressure target range, the rotating speed of the external fan is increased; if the real-time condensing pressure is smaller than the minimum value of the condensing pressure target range, the rotating speed of the external fan is reduced; and if the real-time condensing pressure is within the condensing pressure target range, keeping the current rotating speed of the external fan unchanged, recording the duration time of the real-time condensing pressure within the condensing pressure target range, and executing the independent operation mode of the fluorine pump when the duration time reaches a duration time target value.
Optionally, when the system operation parameter includes the real-time condenser outlet liquid pipe temperature, the acquiring system real-time operation parameter specifically includes: acquiring the temperature of an outlet liquid pipe of the real-time condenser;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the temperature of the outlet liquid pipe of the real-time condenser is larger than the maximum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan is increased; if the temperature of the outlet liquid pipe of the real-time condenser is smaller than the minimum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan is reduced; and if the temperature of the outlet liquid pipe of the real-time condenser is within the target range of the outlet temperature of the condenser, keeping the current rotating speed of the external fan unchanged, recording the duration time of the temperature of the outlet liquid pipe of the real-time condenser within the target range of the outlet temperature of the condenser, and executing the independent operation mode of the fluorine pump when the duration time reaches the target value of the duration time.
Optionally, the external fan has a regulating rate of not more than 1%/s.
In a second aspect, the present application provides a control system of a fluorine pump compression refrigeration system for performing the control method of a fluorine pump compression refrigeration system as described above, the control system of a fluorine pump compression refrigeration system including a compressor individual operation module, a hybrid operation module, and a fluorine pump individual operation module; the compressor individual operation module is used for executing the compressor individual operation mode; the hybrid operation module is used for executing the hybrid operation mode; the fluorine pump individual operation module is configured to execute the fluorine pump individual operation mode.
In a third aspect, the present application provides a fluorine pump pressure refrigeration system, including the control system of a fluorine pump pressure refrigeration system, and further including a compressor, a condenser, a liquid storage tank, a fluorine pump, an expansion valve, and an evaporator, which are sequentially connected; the outlet of the liquid storage tank is connected with the inlet of the expansion valve in series with a first one-way valve, the outlet of the evaporator is connected with the inlet of the condenser in series with a second one-way valve, and the condenser is provided with an external fan.
Optionally, an indoor temperature sensor is arranged at the evaporator, and an outdoor temperature sensor is arranged at the condenser;
the evaporator outlet side is provided with an evaporation pressure sensor, and the condenser outlet side is provided with a condensation pressure sensor and a condenser outlet temperature sensor.
Compared with the prior art, the control method and system for the fluorine pump pressure refrigeration system and the fluorine pump pressure refrigeration system have the following beneficial effects:
according to the control method of the fluorine pump pressure refrigeration system, the fluorine pump pressure refrigeration system can be controlled to operate in the compressor independent operation mode or the mixed operation mode or the fluorine pump independent operation mode, and in the mixed operation mode, both the compressor and the fluorine pump are started to play a role in temperature transition, so that temperature fluctuation caused by the fluorine pump pressure refrigeration system in the mode switching process can be reduced. Meanwhile, when the single operation mode of the compressor is switched to the mixed operation mode, two conditions that the indoor and outdoor temperature difference value is larger than the starting preset temperature difference value of the fluorine pump and the indoor temperature is smaller than the starting preset temperature value of the fluorine pump are simultaneously satisfied; when the single operation mode of the fluorine pump is switched to the single operation mode of the compressor, only one condition that the indoor and outdoor temperature difference value is smaller than the preset temperature difference value for starting the fluorine pump or the indoor temperature is larger than the preset temperature value for starting the compressor is required to be met; it can be seen that the switching time selected by the switching mode is more reasonable, the problems of the rise of the ambient temperature and the frequent start and stop of the equipment caused in the mode switching process can be reduced, and the ambient temperature is stably kept in a reasonable range, so that the safe and reliable operation of the equipment such as a data center and the like is ensured. In addition, in the mixed operation mode, the operation parameters are reasonably controlled, and the independent operation mode of the fluorine pump is switched when the operation parameters reach the preset target range, so that the operation reliability of the compressor and the fluorine pump is improved.
The control system of the fluorine pump pressure refrigeration system and the fluorine pump pressure refrigeration system provided by the application respectively comprise the control method of the fluorine pump pressure refrigeration system, so that the control system and the fluorine pump pressure refrigeration system also have the beneficial effects.
Drawings
Fig. 1 is a schematic structural diagram of a fluorine pump pressure refrigeration system according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of a control method of a fluorine pump pressure refrigeration system according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the refrigerant cycle flow direction (arrows pointing in the figure as the flow direction of the refrigerant) of the fluorine pump compression refrigeration system of fig. 1 when the compressor alone operation mode is performed.
Fig. 4 is a schematic flow diagram of the refrigerant cycle of the fluorine pump compression refrigeration system of fig. 1 when a hybrid mode of operation is performed.
Fig. 5 is a schematic diagram of the refrigerant cycle flow of the fluorine pump compression refrigeration system of fig. 1 when the fluorine pump alone operation mode is performed.
The meaning of the various reference numerals in the drawings is as follows:
1. a compressor; 2. a condenser; 3. a liquid storage tank; 4. a fluorine pump; 5. an expansion valve; 6. an evaporator; 7. a first one-way valve; 8. a second one-way valve; 9. an external fan; 10. an outdoor temperature sensor; 11. a condensing pressure sensor; 12. a condenser outlet temperature sensor; 13. an inner fan; 14. an indoor temperature sensor; 15. an evaporation pressure sensor.
Detailed Description
The technical scheme of the application is further elaborated below by referring to the drawings in the specification and the specific embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the implementations of the present application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1, the fluorine pump pressure refrigeration system in the embodiment of the present application includes a control system, and further includes a compressor 1, a condenser 2, a liquid storage tank 3, a fluorine pump 4, an expansion valve 5, and an evaporator 6, which are sequentially connected. A first one-way valve 7 is connected in series between the outlet of the liquid storage tank 3 and the inlet of the expansion valve 5, a second one-way valve 8 is connected in series between the outlet of the evaporator 6 and the inlet of the condenser 2, an external fan 9 and an outdoor temperature sensor 10 are arranged at the condenser 2, an internal fan 13 and an indoor temperature sensor 14 are arranged at the evaporator 6, a condensing pressure sensor 11 and a condenser outlet temperature sensor 12 are arranged at the outlet side of the condenser 2, and an evaporating pressure sensor 15 is arranged at the outlet side of the evaporator 6. The condenser 2 and the evaporator 6 in this embodiment may be coiled heat exchangers, the expansion valve 5 may be electronic expansion valves, and the number of expansion valves 5 may be set according to actual needs.
The control system of the fluorine pump compression refrigeration system can be used to perform the control method of the fluorine pump compression refrigeration system. Specifically, the control system comprises a compressor independent operation module, a mixed operation module and a fluorine pump independent operation module; the compressor independent operation module is used for executing a compressor independent operation mode; the hybrid operation module is used for executing a hybrid operation mode; the fluorine pump individual operation module is configured to perform a fluorine pump individual operation mode.
As shown in fig. 2, the control method of the fluorine pump compression refrigeration system includes:
s1, a compressor single operation mode:
s1.0, turning off the fluorine pump 4 and turning on the compressor 1.
If the fluorine pump 4 is not turned off, the fluorine pump 4 is turned off first, and if the fluorine pump 4 is turned off, the compressor 1 is turned on directly.
S1.1, acquiring indoor temperature and indoor and outdoor temperature difference values.
The indoor temperature is detected by the indoor temperature sensor 14, the outdoor temperature is detected by the outdoor temperature sensor 10, and the difference between the indoor temperature and the outdoor temperature is calculated to obtain the indoor and outdoor temperature difference.
And S1.2, if the indoor and outdoor temperature difference value is larger than the fluorine pump starting preset temperature difference value and the indoor temperature is smaller than the fluorine pump starting preset temperature value, executing a hybrid operation mode, otherwise, repeatedly executing the step S1.1 and the step S1.2.
Presetting a fluorine pump starting preset temperature difference value and a fluorine pump starting preset temperature value, switching to a mixed operation mode if and only if the indoor and outdoor temperature difference value is larger than the fluorine pump starting preset temperature difference value and the indoor temperature is smaller than the fluorine pump starting preset temperature value, and otherwise continuing to execute the independent operation mode of the compressor. The purpose of this setting is, though in some cases indoor outer temperature difference has reached the fluorine pump and has opened the scope of predetermineeing the temperature difference, but the ambient temperature is still probably too high this moment, carries out the switching of hybrid operation mode like this and then can make ambient temperature rise still, can cause ambient temperature fluctuation too big in the mode switching process, is unfavorable for the safe and stable operation of equipment.
As shown in fig. 3, when the compressor-only operation mode is performed, the first check valve 7 is opened, the second check valve 8 is closed, the compressor 1 is opened, the fluorine pump 4 is closed, the refrigerant flows out from the outlet of the compressor 1, passes through the condenser 2, the liquid storage tank 3, the first check valve 7, the expansion valve 5, and the evaporator 6, and returns to the inlet of the compressor 1 to form a cycle.
S2, a hybrid operation mode:
s2.0, starting the external fan 9, and starting the fluorine pump 4 (at the moment, the compressor 1 is in an on state).
If the external fan 9 is closed, the external fan 9 is started first, and if the external fan 9 is in an open state, the fluorine pump 4 is directly started.
S2.1, acquiring real-time operation parameters of the system.
The system real-time operating parameters include any one of a real-time pressure ratio, a real-time condensing pressure or a real-time condenser outlet liquid pipe temperature.
And S2.2, if the real-time operation parameters of the system are within the preset target range, executing the independent operation mode of the fluorine pump, otherwise, adjusting the real-time operation parameters of the system according to the preset target range, and repeating the step S2.1 and the step S2.2.
Specifically, when the system real-time operating parameters include a real-time pressure ratio, the method comprises the following steps:
s2.1.11, acquiring real-time condensing pressure and real-time evaporating pressure, and calculating to obtain a real-time pressure ratio.
The real-time condensing pressure is detected by the condensing pressure sensor 11, the real-time evaporating pressure is detected by the evaporating pressure sensor 15, and the ratio of the condensing pressure to the evaporating pressure is calculated, so that the real-time pressure ratio is obtained.
S2.2.12, if the real-time pressure ratio is greater than the maximum value of the pressure ratio target range, increasing the rotation speed of the external fan 9, and repeating the steps S2.1.11 and S2.2.12; if the real-time pressure ratio is smaller than the minimum value of the pressure ratio target range, the rotating speed of the outer fan 9 is reduced, and the steps S2.1.11 and S2.2.12 are repeatedly executed; if the real-time pressure ratio is within the pressure ratio target range, the rotating speed of the current external fan 9 is kept unchanged, the duration time of the real-time pressure ratio within the pressure ratio target range is recorded, and when the duration time reaches the duration time target value, the fluorine pump independent operation mode is executed.
Setting a proper pressure ratio target range and a proper duration target value, and reducing the real-time pressure ratio by increasing the rotating speed of the outer fan 9 when the real-time pressure ratio is larger than the maximum value of the pressure ratio target range; when the real-time pressure ratio is smaller than the minimum value of the pressure ratio target range, the real-time pressure ratio is increased by reducing the rotating speed of the outer fan 9; in order to avoid that the pressure of the condenser 2 changes too fast and influences the operation reliability of the fluorine pump 4, the adjusting speed of the external fan 9 can be controlled within 1%/s. The duration is specifically set according to the specific situation, for example, the target ranges of the pressure ratios set to 1 minute, 2 minutes, 3 minutes … … may be set according to the minimum operation pressure ratio of the compressor 1.
When the system operating parameters include real-time condensing pressure, the method comprises the steps of:
s2.1.21, acquiring real-time condensing pressure and real-time evaporating pressure, and calculating a condensing pressure target range according to the real-time evaporating pressure and the pressure ratio target range.
The pressure ratio target range is set according to the minimum operation pressure ratio of the compressor 1, the real-time condensing pressure is detected by the condensing pressure sensor 11, the real-time evaporating pressure is detected by the evaporating pressure sensor 15, and the product of the pressure ratio target range and the evaporating pressure is calculated, so that the real-time condensing pressure target range is obtained.
S2.2.22, if the real-time condensing pressure is greater than the maximum value of the target condensing pressure range, increasing the rotation speed of the outer fan 9, and repeating the steps S2.1.21 and S2.2.22; if the real-time condensing pressure is smaller than the minimum value of the condensing pressure target range, the rotating speed of the outer fan 9 is reduced, and the steps S2.1.21 and S2.2.22 are repeatedly executed; if the real-time condensing pressure is within the condensing pressure target range, the rotating speed of the current external fan 9 is kept unchanged, the duration time of the real-time condensing pressure within the condensing pressure target range is recorded, and when the duration time reaches the duration time target value, the fluorine pump independent operation mode is executed.
Setting a proper pressure ratio target range and a proper duration target value, and reducing the real-time condensing pressure by increasing the rotating speed of the outer fan 9 when the real-time condensing pressure is larger than the maximum value of the condensing pressure target range; when the real-time condensing pressure is smaller than the minimum value of the condensing pressure target range, the real-time condensing pressure is increased by reducing the rotating speed of the outer fan 9; in order to avoid that the pressure of the condenser 2 changes too fast and influences the operation reliability of the fluorine pump 4, the adjusting speed of the external fan 9 can be controlled within 1%/s. The duration is set according to the specific situation, such as 1 minute, 2 minutes, 3 minutes … …
When the system operating parameters include real-time condenser outlet liquid tube temperature, comprising the steps of:
s2.1.31, acquiring the temperature of an outlet liquid pipe of the real-time condenser.
The condenser outlet liquid tube temperature is detected in real time by the condenser outlet temperature sensor 12.
S2.2.32, if the temperature of the outlet liquid pipe of the real-time condenser is greater than the maximum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan 9 is increased, and the steps S2.1.31 and S2.2.32 are repeatedly executed; if the temperature of the outlet liquid pipe of the real-time condenser is smaller than the minimum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan 9 is reduced, and the steps S2.1.31 and S2.2.32 are repeatedly executed; if the temperature of the outlet liquid pipe of the real-time condenser is within the target range of the outlet temperature of the condenser, the rotating speed of the current external fan 9 is kept unchanged, the duration time of the temperature of the outlet liquid pipe of the real-time condenser within the target range of the outlet temperature of the condenser is recorded, and when the duration time reaches the target value of the duration time, the independent operation mode of the fluorine pump is executed.
Setting a proper condenser outlet temperature target range, and when the temperature of the real-time condenser outlet liquid pipe is larger than the maximum value of the condenser outlet temperature target range, reducing the temperature of the real-time condenser outlet liquid pipe by increasing the rotating speed of the external fan 9; when the temperature of the outlet liquid pipe of the real-time condenser is smaller than the minimum value of the target range of the outlet temperature of the condenser, the temperature of the outlet liquid pipe of the real-time condenser is increased by reducing the rotating speed of the outer fan 9; in order to avoid that the pressure of the condenser 2 changes too fast and influences the operation reliability of the fluorine pump 4, the adjusting speed of the external fan 9 can be controlled within 1%/s, and the duration is specifically set according to specific situations. The temperature of the outlet liquid pipe of the real-time condenser is controlled, so that the accuracy of temperature control is improved better. The target range of the condenser outlet temperature can be obtained by subtracting a preset value of the temperature difference of the condenser outlet from the indoor temperature, and the preset value of the temperature difference of the condenser outlet can be determined according to the temperature difference of heat exchange of the evaporator 6. The heat exchange temperature difference of the evaporator refers to the logarithmic average temperature difference of the refrigerant side and the air side of the evaporator.
By reasonably controlling the real-time pressure ratio, the real-time condensing pressure or the temperature of the outlet liquid pipe of the real-time condenser and the duration time within the respective preset target range, the stability of the cooling capacity in the mode switching process can be ensured, and the operation reliability of the compressor 1, the fluorine pump 4 and other devices can be effectively improved.
As shown in fig. 4, when the hybrid operation mode is performed, the first check valve 7 and the second check valve 8 are closed, the compressor 1 is turned on, the fluorine pump 4 is turned on, the refrigerant flows out from the outlet of the compressor 1, passes through the condenser 2, the liquid storage tank 3, the fluorine pump 4, the expansion valve 5, the evaporator 6, and returns to the inlet of the compressor 1 to form a cycle.
S3, a fluorine pump independent operation mode:
s3.1, acquiring indoor temperature and indoor and outdoor temperature difference values.
The indoor temperature is detected by the indoor temperature sensor 14, the outdoor temperature is detected by the outdoor temperature sensor 10, and the difference between the indoor temperature and the outdoor temperature is calculated to obtain the indoor and outdoor temperature difference.
And S3.2, if the indoor and outdoor temperature difference value is smaller than the fluorine pump starting preset temperature difference value or the indoor temperature is larger than the compressor starting preset temperature value, executing a compressor independent operation mode, otherwise, repeatedly executing the step S3.1 and the step S3.2.
Presetting a fluorine pump starting preset temperature difference value and a compressor starting preset temperature value, switching to a compressor independent operation mode when the indoor and outdoor temperature difference value is smaller than the fluorine pump starting preset temperature difference value or the indoor temperature is larger than the compressor starting preset temperature value, or continuously executing the fluorine pump independent operation mode. The purpose of this setting is that although in some cases the indoor and outdoor temperature difference reaches the range of the preset temperature difference for starting the fluorine pump, if the ambient temperature is too high, if the fluorine pump alone operation mode is continuously executed, the ambient temperature is not easy to keep constant and stable, and the safe and stable operation of the equipment is not easy to be performed.
As shown in fig. 5, when the fluorine pump alone operation mode is performed, the first check valve 7 is closed, the second check valve 8 is opened, the compressor 1 is closed, the fluorine pump 4 is opened, the refrigerant flows out from the outlet of the fluorine pump 4, passes through the expansion valve 5, the evaporator 6, the second check valve 8, the condenser 2, and the liquid storage tank 3, and returns to the inlet of the fluorine pump 4 to form a cycle.
According to the method, the mixed operation mode of the compressor and the fluorine pump is introduced in the mode switching process of the fluorine pump compression refrigeration system, and meanwhile, the rotating speed of the external fan is dynamically adjusted in the mixed operation mode, so that parameters such as real-time condensing pressure, real-time pressure ratio or real-time condenser outlet liquid pipe temperature are adjusted, the stability of cooling capacity in the mode switching process is ensured, and the operation reliability of equipment such as the compressor and the fluorine pump is effectively improved. Meanwhile, in the execution process of the mixed operation mode, the speed of the external fan is limited, so that the influence on the operation reliability of the fluorine pump due to the fact that the pressure of the condenser changes too fast is avoided. In addition, the method and the device can judge whether the refrigerating capacity of the fluorine pump meets the heat load requirement of the indoor environment or not through the comprehensive parameters such as indoor and outdoor temperature difference, indoor temperature, pressure ratio, condenser outlet liquid pipe temperature and condensing pressure, so that the proper operation mode is switched timely, and the safety of equipment such as a server and the reliability of an air conditioning system are effectively guaranteed. The precision requirements of different scenes on the safe operation of equipment such as a fluorine pump, a compressor and the like and the temperature control of the working thermal environment of equipment such as a data center server and the like are met by adjusting different system real-time operation parameters such as the real-time pressure ratio, the real-time condensation pressure or the temperature of an outlet liquid pipe of a real-time condenser.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The control method of the fluorine pump pressure refrigeration system is characterized by controlling the fluorine pump pressure refrigeration system to operate in a compressor independent operation mode or a mixed operation mode or a fluorine pump independent operation mode;
in the compressor alone operation mode, the control method of the fluorine pump pressure refrigeration system includes:
closing the fluorine pump and starting the compressor;
acquiring indoor temperature and indoor and outdoor temperature difference values;
judging whether the indoor and outdoor temperature difference is larger than a fluorine pump starting preset temperature difference and whether the indoor temperature is smaller than the fluorine pump starting preset temperature value, if so, entering the mixed operation mode;
in the hybrid operation mode, the control method of the fluorine pump pressure refrigeration system comprises the following steps:
starting the fluorine pump in the state that the compressor is started;
acquiring real-time operation parameters of a system;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering an independent operation mode of the fluorine pump;
in the fluorine pump independent operation mode, the control method of the fluorine pump pressure refrigeration system comprises the following steps:
starting a fluorine pump and closing a compressor;
acquiring indoor temperature and indoor and outdoor temperature difference values;
judging whether the indoor and outdoor temperature difference is smaller than the preset temperature difference for starting the fluorine pump or whether the indoor temperature is larger than the preset temperature value for starting the compressor, and if so, entering the single operation mode of the compressor.
2. The method of controlling a fluorine pump compression refrigeration system of claim 1, wherein said turning on the fluorine pump in the compressor on state further comprises: and starting the external fan.
3. The method of controlling a fluorine pump compression refrigeration system of claim 2, wherein the system real-time operating parameters include any one of a real-time pressure ratio, a real-time condensing pressure, or a real-time condenser outlet liquid line temperature.
4. A method of controlling a fluorine pump compression refrigeration system as recited in claim 3 wherein, when said system real-time operating parameter includes said real-time pressure ratio,
the acquiring system real-time operation parameters specifically comprises the following steps: acquiring real-time condensing pressure and real-time evaporating pressure, and calculating to obtain the real-time pressure ratio;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the real-time pressure ratio is larger than the maximum value of the pressure ratio target range, the rotating speed of the external fan is increased; if the real-time pressure ratio is smaller than the minimum value of the pressure ratio target range, the rotating speed of the external fan is reduced; and if the real-time pressure ratio is within the pressure ratio target range, keeping the current rotating speed of the external fan unchanged, recording the duration time of the real-time pressure ratio within the pressure ratio target range, and executing the independent operation mode of the fluorine pump when the duration time reaches a duration time target value.
5. A method of controlling a fluorine pump compression refrigeration system as recited in claim 3 wherein, when said system operating parameter includes said real-time condensing pressure,
the acquiring system real-time operation parameters specifically comprises the following steps: acquiring real-time condensing pressure and real-time evaporating pressure, and calculating a condensing pressure target range according to the real-time evaporating pressure and a pressure ratio target range;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the real-time condensing pressure is larger than the maximum value of the condensing pressure target range, the rotating speed of the external fan is increased; if the real-time condensing pressure is smaller than the minimum value of the condensing pressure target range, the rotating speed of the external fan is reduced; and if the real-time condensing pressure is within the condensing pressure target range, keeping the current rotating speed of the external fan unchanged, recording the duration time of the real-time condensing pressure within the condensing pressure target range, and executing the independent operation mode of the fluorine pump when the duration time reaches a duration time target value.
6. A method of controlling a fluorine pump compression refrigeration system as recited in claim 3 wherein, when said system operating parameter includes said real-time condenser outlet line temperature,
the acquiring system real-time operation parameters specifically comprises the following steps: acquiring the temperature of an outlet liquid pipe of the real-time condenser;
judging whether the real-time operation parameters of the system are within a preset target range, if so, entering the independent operation mode of the fluorine pump, wherein the method specifically comprises the following steps: if the temperature of the outlet liquid pipe of the real-time condenser is larger than the maximum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan is increased; if the temperature of the outlet liquid pipe of the real-time condenser is smaller than the minimum value of the target range of the outlet temperature of the condenser, the rotating speed of the external fan is reduced; and if the temperature of the outlet liquid pipe of the real-time condenser is within the target range of the outlet temperature of the condenser, keeping the current rotating speed of the external fan unchanged, recording the duration time of the temperature of the outlet liquid pipe of the real-time condenser within the target range of the outlet temperature of the condenser, and executing the independent operation mode of the fluorine pump when the duration time reaches the target value of the duration time.
7. The method of controlling a fluorine pump compression refrigeration system as set forth in any one of claims 4 to 6, wherein the adjustment rate of the external blower is not more than 1%/s.
8. A control system of a fluorine pump compression refrigeration system, characterized by executing the control method of a fluorine pump compression refrigeration system according to any one of claims 1 to 7, the control system of a fluorine pump compression refrigeration system comprising a compressor individual operation module, a hybrid operation module, and a fluorine pump individual operation module; the compressor individual operation module is used for executing the compressor individual operation mode; the hybrid operation module is used for executing the hybrid operation mode; the fluorine pump individual operation module is configured to execute the fluorine pump individual operation mode.
9. A fluorine pump pressure refrigeration system, which is characterized by comprising the control system of the fluorine pump pressure refrigeration system according to claim 8, and further comprising a compressor, a condenser, a liquid storage tank, a fluorine pump, an expansion valve and an evaporator which are connected in sequence; the outlet of the liquid storage tank is connected with the inlet of the expansion valve in series with a first one-way valve, the outlet of the evaporator is connected with the inlet of the condenser in series with a second one-way valve, and the condenser is provided with an external fan.
10. The fluorine pump compression refrigeration system of claim 9, wherein an indoor temperature sensor is provided at the evaporator, and an outdoor temperature sensor is provided at the condenser;
the evaporator outlet side is provided with an evaporation pressure sensor, and the condenser outlet side is provided with a condensation pressure sensor and a condenser outlet temperature sensor.
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| CN118882189A (en) * | 2024-10-08 | 2024-11-01 | 中天宽带技术有限公司 | A frequency control method and system for fluorine pump air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118882189A (en) * | 2024-10-08 | 2024-11-01 | 中天宽带技术有限公司 | A frequency control method and system for fluorine pump air conditioner |
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