CN114353394A - Low-temperature starting control method, device and equipment for machine room air conditioner and storage medium - Google Patents
Low-temperature starting control method, device and equipment for machine room air conditioner and storage medium Download PDFInfo
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Abstract
The invention discloses a low-temperature starting control method, a device, equipment and a storage medium of a machine room air conditioner, which relate to the technical field of air conditioner refrigeration and comprise the following steps: when the collected compressor suction pressure is not less than the liquid storage tank pressure, a heater arranged on the liquid storage tank is started, and return difference adjustment is performed on the heating power of the heater according to the magnitude relation between the liquid storage tank pressure and the compressor suction pressure; when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the air conditioner of the machine room is started, the heater is continuously started, and the pressure of the liquid storage tank is kept higher than the suction pressure of the compressor; dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree; when the pressure of the condenser is higher than that of the liquid storage tank, the heater is turned off, so that the machine room air conditioner enters a normal operation mode. The invention can ensure the normal starting and operation of the air conditioner of the machine room in the low-temperature environment.
Description
Technical Field
The invention relates to the technical field of air conditioner refrigeration, in particular to a low-temperature starting control method, device, equipment and storage medium for a machine room air conditioner.
Background
The heat dissipation problem of a plurality of servers needs to be solved in the data center machine room, and the indoor temperature of the data center machine room is regulated to be 18-27 ℃ by standards. If the temperature of the machine room is high, the reliable operation of the server is seriously influenced, and further the shutdown of the server is caused, so that huge economic loss is caused to an operator.
The air conditioner in the machine room is required to be capable of refrigerating all year round and continuously operating 24 hours all day round, and the coldest air temperature in some areas is about minus 45 ℃. The air conditioner in the machine room with standard configuration can have a fault that the air conditioner cannot be started when being applied at the temperature below-15 ℃, because the outdoor temperature is low and the pressure in the condenser is low when the air conditioner is stopped, the refrigerant can migrate to the condenser, and continuous low pressure can occur in the condenser when the air conditioner is started, so that the refrigerant cannot return to the indoor space, the air conditioner cannot be normally started, and the compressor can be possibly failed due to oil shortage due to more starting times.
Generally, the air conditioners in the machine room are all arranged in the machine room, and the larger the cooling capacity output per square meter of the occupied area is, the more economical the air conditioners are, especially the air conditioners between columns are required to be consistent with the appearance size of a cabinet so as to achieve the integral aesthetic property of the machine room, so that the space utilization of indoor units is also an important problem in the industry.
At present, a low-temperature assembly is mostly arranged in an indoor unit of an air conditioner in a machine room, the floor area of the low-temperature assembly is about 1/8 of the indoor unit, the integral volume of the indoor unit of the air conditioner is increased, and the heat exchange capacity of an evaporator is weakened due to the fact that the air flow organization in the indoor unit is influenced.
Disclosure of Invention
In view of the defects in the prior art, the first aspect of the invention provides a low-temperature start control method for a machine room air conditioner, which can ensure the normal start and operation of the machine room air conditioner in a low-temperature environment.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a low-temperature starting control method for a machine room air conditioner comprises the following steps:
when the collected compressor suction pressure is not less than the liquid storage tank pressure, a heater arranged on the liquid storage tank is started, and return difference adjustment is performed on the heating power of the heater according to the magnitude relation between the liquid storage tank pressure and the compressor suction pressure;
when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the air conditioner of the machine room is started, the heater is continuously started, and the pressure of the liquid storage tank is kept higher than the suction pressure of the compressor;
dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree;
when the pressure of the condenser is higher than that of the liquid storage tank, the heater is turned off, so that the machine room air conditioner enters a normal operation mode.
In some embodiments, the adjusting the heating power of the heater according to the magnitude relationship between the pressure of the liquid storage tank and the suction pressure of the compressor comprises:
when P1 is more than or equal to P2 and more than P1+ ABar, the heating power is output according to the set minimum power;
when P2 is not more than 1/2 × P1, the heating power is output according to the set maximum power;
when 1/2P 1 < P2 < P1, the heating power is output according to the interval linear proportion relation between the set minimum power and the set maximum power;
wherein, P1 is the compressor suction pressure, P2 is the liquid storage tank pressure, A is the set pressure difference.
In some embodiments, the heater continues to be turned on to maintain the reservoir pressure above the compressor suction pressure, including:
the heater is PID controlled by the difference ABar between P2 and P1, and the corresponding heating power is calculated to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor.
In some embodiments, the dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree comprises:
the electronic expansion valve performs PID control according to the suction superheat degree, and when the suction superheat degree is higher than a set threshold value, the opening degree of the electronic expansion valve is increased, and when the suction superheat degree is lower than the set threshold value, the opening degree of the electronic expansion valve is decreased.
In some embodiments, the set threshold is 8 ℃, and the integration time Ti when PID control is performed is 0.5s, the proportionality coefficient Kp is 0.05, and the sampling period is 1 s.
In some embodiments, the method further comprises:
when the suction superheat degree is lower than 2 ℃, the integral time Ti of the electronic expansion valve during PID control is 0.25s, the proportional coefficient Kp is 0.05, and the sampling period is 1s, so as to accelerate the valve closing.
In some embodiments, the liquid storage tank is disposed in an outdoor unit.
The second aspect of the invention provides a low-temperature start control device for a machine room air conditioner, which can ensure the normal start and operation of the machine room air conditioner in a low-temperature environment.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a machine room air conditioner low-temperature start control device comprises:
the acquisition module is used for acquiring the suction pressure of the compressor, the pressure of the liquid storage tank and the pressure of the condenser;
the calculation module is used for calculating the difference value between the suction pressure of the compressor and the pressure of the liquid storage tank and the difference value between the pressure of the condenser and the pressure of the liquid storage tank;
a control module to: when the suction pressure of the compressor is not less than the pressure of the liquid storage tank, a heater arranged on the liquid storage tank is started, and the return difference adjustment is carried out on the heating power of the heater according to the magnitude relation between the pressure of the liquid storage tank and the suction pressure of the compressor;
when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the control module is used for starting an air conditioner of the machine room, controlling the heater to be continuously started and keeping the pressure of the liquid storage tank higher than the suction pressure of the compressor;
the control module also dynamically controls the opening of the electronic expansion valve based on the set suction superheat degree, and closes the heater when the pressure of the condenser is higher than the pressure of the liquid storage tank, so that the machine room air conditioner enters a normal operation mode.
The third aspect of the invention provides a low-temperature start control device for a machine room air conditioner, which can ensure the normal start and operation of the machine room air conditioner in a low-temperature environment.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the machine room air conditioner low-temperature start control device comprises a processor, a memory and a computer program which is stored on the memory and can be executed by the processor, wherein when the computer program is executed by the processor, the steps of the machine room air conditioner low-temperature start control method are realized.
A fourth aspect of the present invention provides a computer-readable storage medium that can guarantee normal start and operation of a room air conditioner in a low temperature environment.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a computer readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-mentioned room air conditioner low-temperature start control method.
Compared with the prior art, the invention has the advantages that:
the low-temperature starting control method of the machine room air conditioner mainly comprises two parts, wherein one part mainly controls the heating power of the electric heating belt, and the other part controls the electronic expansion valve in the starting process, so that the reliable operation of a refrigeration system is ensured, and a unit enters a normal operation mode as soon as possible. By the control method, the normal start of the air conditioner in a low-temperature environment can be ensured, the air conditioner enters a normal operation mode at the fastest speed, the electric heating belt is operated at the minimum power, and the annual operation reliability of the machine room is improved. In addition, the liquid storage tank with larger volume is arranged outdoors, so that the space of the indoor unit is abundant, and the maintainability of the unit is enhanced. The volume of the air conditioner indoor unit in the machine room of the train is effectively reduced, and the refrigerating capacity of the unit volume of the air conditioner is increased. In practical application, more server cabinets can be arranged in a limited space of a data room, and the capacity of a server in the data room is improved.
Drawings
FIG. 1 is a flow chart of a control method for low-temperature starting of an air conditioner in a machine room according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a machine room air conditioner in an embodiment of the present invention;
FIG. 3 is a graph of adjusting the return difference of the heating power of the electric heating belt according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a method for controlling low-temperature start of a machine room air conditioner, where the method includes the following steps:
s1, when the collected compressor suction pressure is not less than the liquid storage tank pressure, a heater arranged on the liquid storage tank is started, and return difference adjustment is carried out on the heating power of the heater according to the size relation between the liquid storage tank pressure and the compressor suction pressure.
S2, when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the air conditioner of the machine room is started, the heater is continuously started, and the pressure of the liquid storage tank is kept higher than the suction pressure of the compressor.
And S3, dynamically controlling the opening of the electronic expansion valve based on the set suction superheat degree.
And S4, when the pressure of the condenser is higher than that of the liquid storage tank, the heater is turned off, and the air conditioner in the machine room enters a normal operation mode.
The following is a specific example:
referring to fig. 2, the air conditioner in the machine room includes a compressor 1, a condenser 2, an electronic expansion valve 3, an evaporator 4, a liquid storage tank 5, a check valve 6, an electric heating belt 7, a drying filter 8, a liquid viewing mirror 9, a compressor suction temperature sensor 10, a compressor suction pressure sensor 11, a liquid storage tank pressure sensor 12, and a condenser pressure sensor 13.
Among them, the heater in step S1 selects the electric heating belt 7, and the pressure marks collected by the compressor suction pressure sensor 11, the reservoir pressure sensor 12 and the condenser pressure sensor 13 are P1, P2 and P3.
The main principle of the low-temperature environment work of the machine room air conditioner in the embodiment is as follows:
the pressure of the air suction side of the compressor is compared with the pressure of the liquid storage tank 5 before starting, if the pressure of the liquid storage tank 5 is small, the refrigerant on the outdoor side cannot be transferred to the air suction side of the compressor through pressure difference when the compressor 1 is started, so that the air suction pressure is too low, and the air conditioner cannot be started. At the moment, the electric heating belt 7 is opened to heat the liquid storage tank 5, so that the internal pressure of the liquid storage tank 5 is increased until the internal pressure is higher than the suction side pressure, the refrigerant liquid in the liquid storage tank 5 can flow to the suction side of the compressor in time, and the unit can be started.
After starting the compressor, the refrigerant is firstly compressed into high-temperature and high-pressure gas by the compressor 1 and flows to the outdoor unit, then the high-pressure gas is released by the condenser 2 to become high-pressure saturated (or supercooled) refrigerant liquid, a period of time is needed for the pressure in the condenser to rise to be higher than the pressure of the liquid storage tank due to the low ambient temperature, the electric heating belt 7 on the liquid storage tank 5 needs to continue to work in the period of time, and the pressure of the liquid storage tank is kept to be higher than the suction side pressure of the compressor. Before the unit normally operates, the opening degree of the electronic expansion valve 3 is smaller, and a larger suction superheat degree is controlled, so that on one hand, liquid in the liquid storage tank is prevented from excessively entering the indoor side, and the compressor is prevented from generating liquid impact; on the other hand, the exhaust superheat degree is indirectly improved, so that the system can quickly establish high pressure. When the pressure of the condenser is larger than the pressure of the liquid storage tank and larger than the pressure of the air suction side of the compressor, the pressure difference of the whole refrigeration cycle is established, the electric heating belt 7 can be closed, and the unit enters a normal operation mode after the low-temperature starting mode is ended.
In some embodiments, the adjusting the heating power of the heater according to the magnitude relationship between the pressure of the liquid storage tank and the suction pressure of the compressor in step S1 includes:
when P1 is more than or equal to P2 and more than P1+ ABar, the heating power is output according to the set minimum power;
when P2 is not more than 1/2 × P1, the heating power is output according to the set maximum power;
when 1/2P 1 < P2 < P1, the heating power is output according to the interval linear proportion relation between the set minimum power and the set maximum power;
wherein, P1 is the compressor suction pressure, P2 is the liquid storage tank pressure, A is the set pressure difference. The value of a can be set reasonably according to actual conditions, and as a preferred embodiment, a can be set to be 2.
It is worth mentioning that the set minimum power and the maximum power can be reasonably set according to the actual requirement, and preferably, the minimum power can be set to be 30% of the maximum heating power of the electric heating belt 7, and the maximum power can be set to be 100% of the maximum heating power of the electric heating belt 7. At this time, the heating power adjustment graph of the electric heating belt 7 can be seen in fig. 3.
It can be understood that when P1 < P2, the room air conditioner will start normally.
In some embodiments, in step S2, when the heated storage tank pressure is higher than the compressor suction pressure, the machine room air conditioner is turned on, that is, when P2 is P1+ ABar, the machine room air conditioner will be turned on to operate.
After the air conditioner in the machine room is started to operate, the heater in the step S2 is continuously turned on to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor, including:
the electric heating belt 7 is subjected to PID control by the difference value ABar of P2 and P1, and corresponding heating power is calculated so as to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor. Preferably, a may be set to 2.
Specifically, in the case of PID control, the integration time Ti is 5s, the proportionality coefficient Kp is 0.1, and the sampling period is 1 s.
Meanwhile, in some embodiments, the dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree in step S3 includes:
the electronic expansion valve 3 performs PID control based on the intake superheat, and increases the opening degree of the electronic expansion valve when the intake superheat is higher than a set threshold value, and decreases the opening degree of the electronic expansion valve when the intake superheat is lower than the set threshold value.
Specifically, after the air conditioner in the machine room is started to operate, the electronic expansion valve 3 is opened according to the advanced opening degree, and the opening degree can be 40%; after the time delay (10 seconds can be taken) is passed, the compressor 1 is started, and is gradually started according to the frequency increasing step, the compressor operates according to the set rotating speed of 30RPS, after the time delay of 40 seconds, the compressor enters the frequency increasing step again to 50RPS, and the starting process is finished after the time delay of 20 seconds.
The electronic expansion valve 3 performs PID control based on the suction superheat calculated from the suction temperature and the low pressure, as follows: the system uses R410A cold coal, and the suction saturation temperature can be calculated through low-pressure, and the superheat degree is the difference between the suction temperature and the suction saturation temperature. When the suction superheat is higher than the set point, the opening degree of the electronic expansion valve 3 is increased. When the suction superheat is lower than the set point, the opening degree of the electronic expansion valve 3 is decreased. The threshold value of the suction superheat in this embodiment is set to 8 ℃, and when the superheat is reduced to 2 ℃ or less, the electronic expansion valve 3 is accelerated to close the valve.
In this embodiment, the integration time Ti during PID control is 0.5s, the proportionality coefficient Kp is 0.05, and the sampling period is 1 s. When the suction superheat degree is lower than 2 ℃, the integral time Ti of the electronic expansion valve during PID control is 0.25s, the proportional coefficient Kp is 0.05, and the sampling period is 1s, so that the valve is closed in an accelerating manner.
Finally, when the condenser pressure P3 and the reservoir pressure P2 are met, P3 being P2+2bar, the electrical heating belt is turned off and the unit enters a normal operating mode.
By the control method, the normal start of the air conditioner in a low-temperature environment can be ensured, the air conditioner enters a normal operation mode at the fastest speed, the electric heating belt is operated at the minimum power, and the annual operation reliability of the machine room is improved.
In addition, in some embodiments, the liquid storage tank 5 with a larger volume is arranged outdoors, and heat insulation cotton is bound on the outer side of the whole liquid storage tank and the one-way valve and the pipeline on the front side of the one-way valve, so that the heat exchange quantity between the inside and the outside of the tank is prevented. The space of the indoor unit is abundant, and the maintainability of the unit is enhanced.
In summary, the method for controlling the low-temperature start of the air conditioner in the machine room mainly comprises two parts, wherein one part mainly controls the heating power of the electric heating belt 7, and the other part controls the electronic expansion valve 3 in the starting process, so that the refrigeration system can operate reliably, and the machine set can enter a normal operation mode as soon as possible. By the control method, the normal start of the air conditioner in a low-temperature environment can be ensured, the air conditioner enters a normal operation mode at the fastest speed, the electric heating belt 7 is operated at the minimum power, and the annual operation reliability of the machine room is improved. Moreover, the invention arranges the liquid storage tank 5 with larger volume outdoors, so that the space of the indoor unit is abundant, and the maintainability of the unit is enhanced. The volume of the air conditioner indoor unit in the machine room of the train is effectively reduced, and the refrigerating capacity of the unit volume of the air conditioner is increased. In practical application, more server cabinets can be arranged in a limited space of a data room, and the capacity of a server in the data room is improved.
Meanwhile, the embodiment of the invention also provides a low-temperature starting control device of the machine room air conditioner, which comprises an acquisition module, a calculation module and a control module.
The collecting module is used for collecting the suction pressure of the compressor, the pressure of the liquid storage tank and the pressure of the condenser.
The calculation module is used for calculating the difference value between the suction pressure of the compressor and the pressure of the liquid storage tank and the difference value between the pressure of the condenser and the pressure of the liquid storage tank.
A control module to: when the suction pressure of the compressor is not less than the pressure of the liquid storage tank, a heater arranged on the liquid storage tank is started, and the heating power of the heater is adjusted according to the magnitude relation between the pressure of the liquid storage tank and the suction pressure of the compressor. And when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the control module is used for starting the air conditioner of the machine room, controlling the heater to be continuously started and keeping the pressure of the liquid storage tank higher than the suction pressure of the compressor. The control module also dynamically controls the opening of the electronic expansion valve based on the set suction superheat degree, and closes the heater when the pressure of the condenser is higher than the pressure of the liquid storage tank, so that the machine room air conditioner enters a normal operation mode.
In some embodiments, the control module adjusts the heating power of the heater according to the magnitude relationship between the pressure of the liquid storage tank and the suction pressure of the compressor, and includes:
when P1 is more than or equal to P2 and more than P1+ ABar, the heating power is output according to the set minimum power;
when P2 is not more than 1/2 × P1, the heating power is output according to the set maximum power;
when 1/2P 1 < P2 < P1, the heating power is output according to the interval linear proportion relation between the set minimum power and the set maximum power;
wherein, P1 is the compressor suction pressure, P2 is the liquid storage tank pressure, A is the set pressure difference. Preferably, the heater is an electric heating belt 7, and the value of A is 2.
In some embodiments, the control module is configured to turn on an air conditioner in a machine room, control the heater to continue to be turned on, and maintain the pressure of the liquid storage tank higher than the suction pressure of the compressor, and includes:
the heater is PID controlled by the difference ABar between P2 and P1, and the corresponding heating power is calculated to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor.
Specifically, the electric heating belt 7 is PID-controlled with the difference 2Bar between P2 and P1, calculating the corresponding heating power to keep the reservoir pressure higher than the compressor suction pressure. When PID control is performed, the integral time Ti is taken as 5s, the proportional coefficient Kp is taken as 0.1, and the sampling period is taken as 1 s.
In some embodiments, the control module further dynamically controls an opening degree of the electronic expansion valve based on the set suction superheat degree, including:
the electronic expansion valve performs PID control according to the suction superheat degree, and when the suction superheat degree is higher than a set threshold value, the opening degree of the electronic expansion valve is increased, and when the suction superheat degree is lower than the set threshold value, the opening degree of the electronic expansion valve is decreased.
Specifically, after the air conditioner in the machine room is started to operate, the electronic expansion valve 3 is opened according to the EEV advanced opening degree, and the opening degree can be 40%; after the time delay (10 seconds can be taken) is passed, the compressor 1 is started, and is gradually started according to the frequency increasing step, the compressor operates according to the set rotating speed of 30RPS, after the time delay of 40 seconds, the compressor enters the frequency increasing step again to 50RPS, and the starting process is finished after the time delay of 20 seconds.
The electronic expansion valve 3 performs PID control based on the suction superheat calculated from the suction temperature and the low pressure, as follows: the system uses R410A cold coal, and the suction saturation temperature can be calculated through low-pressure, and the superheat degree is the difference between the suction temperature and the suction saturation temperature. When the suction superheat is higher than the set point, the opening degree of the electronic expansion valve 3 is increased. When the suction superheat is lower than the set point, the opening degree of the electronic expansion valve 3 is decreased. The threshold value of the suction superheat in this embodiment is set to 8 ℃, and when the superheat is reduced to 2 ℃ or less, the electronic expansion valve 3 is accelerated to close the valve.
In this embodiment, the integration time Ti during PID control is 0.5s, the proportionality coefficient Kp is 0.05, and the sampling period is 1 s. When the suction superheat degree is lower than 2 ℃, the integral time Ti of the electronic expansion valve during PID control is 0.25s, the proportional coefficient Kp is 0.05, and the sampling period is 1s, so that the valve is closed in an accelerating manner.
In some embodiments, the liquid storage tank will be placed in the outdoor unit for low temperature turn-on of the room air conditioner.
In summary, the low-temperature start control device for the air conditioner in the machine room comprises an acquisition module, a calculation module and a control module. The control module mainly comprises two parts, wherein one part mainly controls the heating power of the electric heating belt 7, and the other part controls the electronic expansion valve 3 in the starting process, so that the refrigeration system can operate reliably, and the unit can enter a normal operation mode as soon as possible. Through above-mentioned computer lab air conditioner low temperature start control device, can guarantee the normal start of air conditioner under the low temperature environment, get into normal operating mode the fastest, and minimum power operation electric heating tape 7 improves the reliability of computer lab operation throughout the year. Moreover, the invention arranges the liquid storage tank 5 with larger volume outdoors, so that the space of the indoor unit is abundant, and the maintainability of the unit is enhanced. The volume of the air conditioner indoor unit in the machine room of the train is effectively reduced, and the refrigerating capacity of the unit volume of the air conditioner is increased. In practical application, more server cabinets can be arranged in a limited space of a data room, and the capacity of a server in the data room is improved.
The embodiment of the invention also provides a machine room air conditioner low-temperature start control device, which comprises a processor, a memory and a computer program stored on the memory and executable by the processor, wherein when the computer program is executed by the processor, the steps of the machine room air conditioner low-temperature start control method are realized.
It should be understood that the Processor may be a Central Processing Unit (CPU), and the Processor may be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Wherein, in one embodiment, the processor is configured to execute a computer program stored in the memory to implement the steps of:
when the collected compressor suction pressure is not less than the liquid storage tank pressure, a heater arranged on the liquid storage tank is started, and return difference adjustment is performed on the heating power of the heater according to the magnitude relation between the liquid storage tank pressure and the compressor suction pressure;
when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the air conditioner of the machine room is started, the heater is continuously started, and the pressure of the liquid storage tank is kept higher than the suction pressure of the compressor;
dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree;
when the pressure of the condenser is higher than that of the liquid storage tank, the heater is turned off, so that the machine room air conditioner enters a normal operation mode.
In one embodiment, the processor is used for adjusting the return difference of the heating power of the heater according to the magnitude relation between the pressure of the liquid storage tank and the suction pressure of the compressor, and is used for realizing that:
when P1 is more than or equal to P2 and more than P1+ ABar, the heating power is output according to the set minimum power;
when P2 is not more than 1/2 × P1, the heating power is output according to the set maximum power;
when 1/2P 1 < P2 < P1, the heating power is output according to the interval linear proportion relation between the set minimum power and the set maximum power;
wherein, P1 is the compressor suction pressure, P2 is the liquid storage tank pressure, A is the set pressure difference.
In one embodiment, the processor enables the heater to continue to turn on, maintaining the reservoir pressure above the compressor suction pressure, for enabling:
the heater is PID controlled by the difference ABar between P2 and P1, and the corresponding heating power is calculated to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor.
In one embodiment, the processor implements dynamic control of the opening of the electronic expansion valve based on a set suction superheat to implement:
the electronic expansion valve performs PID control according to the suction superheat degree, and when the suction superheat degree is higher than a set threshold value, the opening degree of the electronic expansion valve is increased, and when the suction superheat degree is lower than the set threshold value, the opening degree of the electronic expansion valve is decreased.
Wherein the set threshold is 8 ℃, the integration time Ti during PID control is 0.5s, the proportionality coefficient Kp is 0.05, and the sampling period is 1 s. When the suction superheat degree is lower than 2 ℃, the integral time Ti of the electronic expansion valve during PID control is 0.25s, the proportional coefficient Kp is 0.05, and the sampling period is 1s, so as to accelerate the valve closing.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the control method for the low-temperature starting of the air conditioner in the machine room are realized.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable storage media, which may include computer readable storage media (or non-transitory media) and communication media (or transitory media).
The term computer-readable storage medium includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
For example, the computer readable storage medium may be an internal storage unit of the electronic device of the foregoing embodiment, such as a hard disk or a memory of the electronic device. The computer readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk provided on the electronic device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like.
The above embodiments are only specific embodiments of the present invention, but the scope of the embodiments of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the embodiments of the present invention, and these modifications or substitutions should be covered by the scope of the embodiments of the present invention. Therefore, the protection scope of the embodiments of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A low-temperature starting control method of a machine room air conditioner is characterized by comprising the following steps:
when the collected compressor suction pressure is not less than the liquid storage tank pressure, a heater arranged on the liquid storage tank is started, and return difference adjustment is performed on the heating power of the heater according to the magnitude relation between the liquid storage tank pressure and the compressor suction pressure;
when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the air conditioner of the machine room is started, the heater is continuously started, and the pressure of the liquid storage tank is kept higher than the suction pressure of the compressor;
dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree;
when the pressure of the condenser is higher than that of the liquid storage tank, the heater is turned off, so that the machine room air conditioner enters a normal operation mode.
2. The method for controlling the low-temperature start of the air conditioner in the machine room as claimed in claim 1, wherein the adjusting the heating power of the heater according to the magnitude relation between the pressure of the liquid storage tank and the suction pressure of the compressor comprises:
when P1 is more than or equal to P2 and more than P1+ ABar, the heating power is output according to the set minimum power;
when P2 is not more than 1/2 × P1, the heating power is output according to the set maximum power;
when 1/2P 1 < P2 < P1, the heating power is output according to the interval linear proportion relation between the set minimum power and the set maximum power;
wherein, P1 is the compressor suction pressure, P2 is the liquid storage tank pressure, A is the set pressure difference.
3. The method for controlling the low-temperature start of the air conditioner in the machine room as claimed in claim 2, wherein the step of continuously starting the heater to maintain the pressure of the liquid storage tank higher than the suction pressure of the compressor comprises the following steps:
the heater is PID controlled by the difference ABar between P2 and P1, and the corresponding heating power is calculated to keep the pressure of the liquid storage tank higher than the suction pressure of the compressor.
4. The method for controlling the low-temperature start of the air conditioner of the machine room as claimed in claim 2, wherein the dynamically controlling the opening degree of the electronic expansion valve based on the set suction superheat degree comprises:
the electronic expansion valve performs PID control according to the suction superheat degree, and when the suction superheat degree is higher than a set threshold value, the opening degree of the electronic expansion valve is increased, and when the suction superheat degree is lower than the set threshold value, the opening degree of the electronic expansion valve is decreased.
5. The low-temperature start control method of the air conditioner of the machine room as claimed in claim 4, wherein:
the set threshold value is 8 ℃, the integral time Ti during PID control is 0.5s, the proportional coefficient Kp is 0.05, and the sampling period is 1 s.
6. The machine room air conditioner cold start control method as claimed in claim 5, wherein the method further comprises:
when the suction superheat degree is lower than 2 ℃, the integral time Ti of the electronic expansion valve during PID control is 0.25s, the proportional coefficient Kp is 0.05, and the sampling period is 1s, so as to accelerate the valve closing.
7. The method as claimed in claim 1, wherein the receiver is disposed in an outdoor unit.
8. The utility model provides a computer lab air conditioner cold-starting controlling means which characterized in that includes:
the acquisition module is used for acquiring the suction pressure of the compressor, the pressure of the liquid storage tank and the pressure of the condenser;
the calculation module is used for calculating the difference value between the suction pressure of the compressor and the pressure of the liquid storage tank and the difference value between the pressure of the condenser and the pressure of the liquid storage tank;
a control module to: when the suction pressure of the compressor is not less than the pressure of the liquid storage tank, a heater arranged on the liquid storage tank is started, and the return difference adjustment is carried out on the heating power of the heater according to the magnitude relation between the pressure of the liquid storage tank and the suction pressure of the compressor;
when the pressure of the heated liquid storage tank is higher than the suction pressure of the compressor, the control module is used for starting an air conditioner of the machine room, controlling the heater to be continuously started and keeping the pressure of the liquid storage tank higher than the suction pressure of the compressor;
the control module also dynamically controls the opening of the electronic expansion valve based on the set suction superheat degree, and closes the heater when the pressure of the condenser is higher than the pressure of the liquid storage tank, so that the machine room air conditioner enters a normal operation mode.
9. A machine room air conditioner cold start control apparatus, characterized in that the machine room air conditioner cold start control apparatus comprises a processor, a memory, and a computer program stored on the memory and executable by the processor, wherein the computer program, when executed by the processor, implements the steps of the machine room air conditioner cold start control method according to any one of claims 1 to 7.
10. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the room air conditioner low-temperature start control method according to any one of claims 1 to 7.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206709453U (en) * | 2017-04-14 | 2017-12-05 | 铨高科技（珠海）股份有限公司 | It is a kind of can cold-starting air conditioner in machine room |
| CN213335025U (en) * | 2020-09-22 | 2021-06-01 | 广东海悟科技有限公司 | Air conditioning system for improving low-temperature operation reliability |
| CN112880123A (en) * | 2019-11-29 | 2021-06-01 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| CN214841801U (en) * | 2021-07-15 | 2021-11-23 | 上海海事大学 | Refrigerating system capable of being started quickly in low-temperature environment |
-
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206709453U (en) * | 2017-04-14 | 2017-12-05 | 铨高科技（珠海）股份有限公司 | It is a kind of can cold-starting air conditioner in machine room |
| CN112880123A (en) * | 2019-11-29 | 2021-06-01 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| WO2021103476A1 (en) * | 2019-11-29 | 2021-06-03 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| CN213335025U (en) * | 2020-09-22 | 2021-06-01 | 广东海悟科技有限公司 | Air conditioning system for improving low-temperature operation reliability |
| CN214841801U (en) * | 2021-07-15 | 2021-11-23 | 上海海事大学 | Refrigerating system capable of being started quickly in low-temperature environment |
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