CN108548352B - Control method of machine room air conditioning system - Google Patents
Control method of machine room air conditioning system Download PDFInfo
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- CN108548352B CN108548352B CN201810358941.0A CN201810358941A CN108548352B CN 108548352 B CN108548352 B CN 108548352B CN 201810358941 A CN201810358941 A CN 201810358941A CN 108548352 B CN108548352 B CN 108548352B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a machine room air conditioning system and a control method thereof, wherein the system comprises an outer machine and an inner machine, the outer machine is connected with the inner machine, an inlet and outlet pipeline of a condenser of the outer machine is connected with a temperature sensor and a pressure sensor, a water inlet pipeline and a water outlet pipeline are provided with the temperature sensor, an inlet and outlet pipeline of a fluorine pump is connected with the temperature sensor and the pressure sensor, an outlet pipeline of the fluorine pump is connected with a bypass pipeline, the other end of the bypass pipeline is connected with an inlet pipeline of the condenser, a bypass electromagnetic valve is connected with the bypass pipeline, an inlet pipeline of an electronic expansion valve of the inner machine is connected with the temperature sensor and the pressure sensor, an outlet pipeline of an evaporator is connected with the temperature sensor and the. The control method comprises an internal machine control method and an external machine control method. The invention is safe, reliable and stable, and can meet the requirements of air conditioners in machine rooms.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a machine room air conditioning system.
Background
With the high-speed development of data centers, the security, reliability and stability of the air conditioner in the machine room as an important part of the environmental control of the data centers are more and more emphasized.
The safety, reliability and stability of the air conditioner in the machine room are mainly embodied in the following aspects:
1. the requirement of the data center machine room on constant temperature and humidity requires that the air conditioner of the machine room can adjust energy output in time, and the stable temperature and humidity of the data center machine room are kept.
2. The data center machine room runs continuously for 24 hours all day, so that the air conditioner of the machine room is required to run continuously for a long time, has high reliability and is not easy to break down.
3. The data center machine room does not allow electrical devices such as a server and the like to generate condensation, so that strict requirements on the temperature and humidity of air supply of an air conditioner of the machine room are met.
4. Various cold sources can be used, such as chilled water of a central air conditioner of a building, a natural cold source and the like.
5. Water does not enter the data center machine room as much as possible. The water leakage is avoided, and the safety of the electronic equipment in the machine room is endangered.
Therefore, it is necessary to provide a room air conditioner that can satisfy the above requirements.
Disclosure of Invention
In order to meet the requirements of the air conditioner in the machine room, the invention provides the air conditioning system in the machine room, which is safe, reliable and good in stability and can meet the requirements of the air conditioner in the machine room.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a computer lab air conditioning system, includes outer machine and interior machine, and outer machine and interior machine link to each other, and outer machine includes condenser and fluorine pump, and the interior machine includes evaporimeter and electronic expansion valve, and the export of condenser links to each other with the import of fluorine pump, and the export of fluorine pump links to each other with electronic expansion valve's import, and electronic expansion valve's export links to each other with the import of evaporimeter, and the export of evaporimeter links to each other with the import of condenser, its characterized in that: a temperature sensor T1 and a pressure sensor PS1 are connected to an inlet pipeline of the condenser, a temperature sensor T2 is connected to an outlet pipeline of the condenser, a temperature sensor T5 is connected to an inlet pipeline of the condenser, a temperature sensor T6 and an electric two-way valve are connected to an outlet pipeline of the condenser, a temperature sensor T3 and a pressure sensor PS2 are connected to an inlet pipeline of the fluorine pump, a temperature sensor T4 and a pressure sensor PS3 are connected to an outlet pipeline of the fluorine pump, a bypass pipeline is connected to a pipeline connecting the fluorine pump and the electronic expansion valve, the other end of the bypass pipeline is connected to the inlet pipeline of the condenser, a bypass electromagnetic valve is connected to the bypass pipeline, a temperature sensor T7 and a pressure sensor PS4 are connected to the inlet pipeline of the electronic expansion valve, a temperature sensor T8 and a pressure sensor PS5 are connected to the, the evaporator is also provided with a return air temperature and humidity sensor and an outlet air temperature and humidity sensor.
Still parallelly connected on the pipeline that condenser and fluorine pump link to each other has the branch pipeline, is connected with the reservoir on the branch pipeline, and the import and the export of reservoir all are connected with the ball valve, install the ball valve on the pipeline that condenser and fluorine pump link to each other, and the reservoir is connected with liquid level switch.
The fluorine pump has two, and two fluorine pumps are parallelly connected.
The inlet and the outlet of the two fluorine pumps are both connected with ball valves, and the outlets of the two fluorine pumps are both connected with one-way valves.
And a pipeline connecting the fluorine pump and the electronic expansion valve is also provided with a drying filter, a liquid path electromagnetic valve and a ball valve, and a pipeline connecting the evaporator and the condenser is also connected with the ball valve.
And liquid sight glasses are arranged on the outlet pipeline and the inlet pipeline of the drying filter.
The condenser is a plate heat exchanger, a sleeve type condenser, a shell and tube type condenser and other water-cooled condensers.
The invention also provides a control method of the air conditioning system, which comprises an inner machine control method and an outer machine control method, wherein the inner machine control method comprises an inner machine starting-up control method and an electronic expansion valve opening degree control method, and the outer machine control method comprises an outer machine starting-up control method, an electric two-way valve opening degree control method, a bypass electromagnetic valve control method, a fluorine pump switching control method, a liquid level switch control method and a condenser inlet water temperature control method.
The internal machine starting control method specifically comprises the following steps:
when: when the detection value is larger than the set value and dead zone, the refrigeration demand = ((detection value-set value-dead zone)/precision) × 100%;
when: when the set value-dead zone is not more than the detected value and not more than the set value + dead zone, the refrigeration requirement = 0;
when: when the detected value is less than the set value-dead zone, the refrigeration requirement = ((detected value-set value + dead zone)/precision) × 100%;
when the refrigeration demand is more than 0, the internal machine is started to operate, the refrigeration demand is less than-100%, and the internal machine stops operating; when the internal machine is started to operate, the internal machine can be stopped only when the refrigeration demand is less than-100%, and when the internal machine is stopped to operate, the internal machine can be started to operate only when the refrigeration demand is greater than 0.
The detection value is the detection value of the return air temperature of the evaporator, namely the detection value of the return air temperature and humidity sensor, the set value is the set value of the return air temperature of the evaporator, a user can set the return air temperature according to the actual situation, and the set value is
The default of the temperature is 35 ℃ at 28-40 ℃, the dead zone is the dead zone temperature, the set value is 0.5-2 ℃, and the default value is 1 ℃. The precision refers to the precision requirement of the return air temperature of the evaporator, and can be set by a user, the set value is 1-10 ℃, and the default value is 1 DEG C
The opening control method of the electronic expansion valve comprises the following specific steps:
when: when the outlet air temperature detection value is larger than the outlet air temperature set value + dead zone, the requirement = ((outlet air temperature detection value-outlet air temperature set value-dead zone)/precision) × 100%;
when: when the air outlet temperature set value-dead zone is less than or equal to the air outlet temperature detection value is less than or equal to the air outlet temperature set value + dead zone, the requirement = 0;
when: when the outlet air temperature detection value is less than the outlet air temperature set value-dead zone, the requirement = ((outlet air temperature detection value-outlet air temperature set value + dead zone)/precision) = 100%;
when the requirement is less than or equal to 0%, the minimum opening degree of the electronic expansion valve is determined;
when the demand is more than or equal to 100%, the maximum opening degree of the electronic expansion valve is achieved;
when the requirement is more than or equal to 0% and less than or equal to 100%, the opening of the electronic expansion valve is in direct proportion to the requirement;
the air outlet temperature detection value is a detection value of the air outlet temperature of the evaporator, namely a value detected by an air outlet temperature and humidity sensor, the air outlet temperature set value is a set value of the air outlet temperature of the evaporator, the set value is 17-28 ℃, the default value is 24 ℃, the dead zone is a dead zone temperature, the set value is 0.5-2 ℃, and the default value is 1 ℃. The precision refers to the precision requirement of the air outlet temperature of the evaporator, and a user can set the precision by himself, wherein the set value is 1-10 ℃, and the default is 1 ℃.
The superheat degree of the electronic expansion valve is 0.5-1K, and the default value is 0.5K.
And (3) controlling an evaporation fan of the evaporator: the evaporation fan is an EC fan, the EC fan has selectable constant speed mode and temperature difference average, the specific mode selection adjusts the operation according to the dead zone and the precision,
the starting control method of the external unit specifically comprises the following steps: starting the machine set, enabling the machine set to be in a standby state, enabling the electric two-way valve to be in a minimum opening degree, detecting an inner machine, starting the fluorine pump when the inner machine has a refrigeration requirement (when a liquid path electromagnetic valve of the inner machine is opened), and stopping the fluorine pump when the liquid path electromagnetic valve of the inner machine is completely closed, wherein the electric two-way valve is in the minimum opening degree.
The method for controlling the opening degree of the electric two-way valve comprises the following steps:
when: when the temperature sensor T2 is less than or equal to Ta, the electric two-way valve keeps the minimum opening degree, the default of Ta is 12 ℃, the 10 ℃ to 20 ℃ can be set, the graduation is 0.1 ℃, the default of Omin is 20%, the default of 10% to 50% can be set, and the graduation is 1%.
When: when the temperature sensor T2 is larger than or equal to Tb (Tb > Ta), the electric two-way valve keeps the maximum opening Omax to operate, the Tb defaults to 14 ℃, the temperature is 10-20 ℃, the indexing is 0.1 ℃, the Omax defaults to 100%, the 60-100% can be set, and the indexing is 1%.
When: when Ta is more than T2 and less than Tb, the electric two-way valve carries out PID control adjustment from Omin to Omax according to requirements, and the algorithm of the PID control adjustment is as follows: the parameter P is set by the system between 50 and 200; the parameter I is set by the user between 100 and 210, and the parameter D is set by the user between 0 and 100;
current error: current _ err = set temperature value Ta — current temperature value T2;
last error: last _ err = prev _ err (last error);
last error: prev _ err = current _ err;
request = P (current _ err-prev _ err) + I current _ err + D (current _ err-2 prev _ err + last _ err),
when the Request is larger than 0, the opening requirement of the electric two-way valve is not met, and the minimum opening Omin of the electric two-way valve is maintained.
When the Request is < 0,
the two-way valve opening degree O = | Request | ÷ 100 + Omin; (Omin < O < Omax)
The bypass electromagnetic valve control method specifically comprises the following steps:
a fluorine pump inlet pressure P2 (unit: bar) a fluorine pump outlet pressure P3 (unit: bar), a default bypass solenoid valve ON pressure of 5.5bar, and when P3-P2= 5.5bar, the bypass solenoid valve is opened (the bypass solenoid valve ON pressure can be set in the range of 2-8bar, and the division =0.1 bar);
default bypass solenoid OFF pressure is 4.5bar, when P3-P2=4.5bar, and ON pressure > OFF pressure, bypass solenoid is closed (bypass solenoid OFF pressure settable range: 2-8bar, division =0.1 bar).
The fluorine pump switching control method specifically comprises the following steps:
the running time of one fluorine pump reaches 720h (1 h to 3000h can be set, the graduation is 1h, the default value is 720 h), and the other fluorine pump is switched to run;
when the fluorine pump runs, the pressure difference between the outlet and the inlet of the fluorine pump needs to be detected: P3-P2; P3-P2 is less than or equal to 1.2bar, (0 to 5bar can be set, the division ratio is 0.1bar, and the default value is 1.2 bar); duration 60s, (0 to 600s can be set, graduation: 1s, default 60 s), switching the fluorine pump to operate, and outputting an alarm: "several # fluorine pump failure";
when the operation of the other fluorine pump is switched, detecting the inlet-outlet pressure difference of the fluorine pump by delaying 60s (the delay time can be set from 0 to 600s, the graduation is 1s, and the default value is 60 s);
under the condition that the '1 # fluorine pump fault' and the '2 # fluorine pump fault' are not removed, the current fluorine pump is maintained to be operated, one fluorine pump fault can be automatically removed, two fluorine pump faults can be only manually removed, and the alarm condition is removed: fluorine pump outlet and inlet differential pressure: P3-P2 is more than or equal to 2 bar; due to the difference between the outlet pressure and the inlet pressure of the fluorine pump: the fault of the fluorine pump caused by P3-P2 being less than or equal to 1.2bar, the fluorine pump is not stopped; when the fluorine pumps are switched, the running fluorine pumps stop running, and after the time delay of 5s, the other fluorine pump is started.
The liquid level switch control method specifically comprises the following steps:
when the fluorine pump is running, the float liquid level switch is switched on, and the duration: 30s, warning: "insufficient refrigerant". But not shut down.
The method for controlling the inlet water temperature of the condenser specifically comprises the following steps:
when the fluorine pump runs, the water inlet temperature T5 of the condenser needs to be detected, T5 is more than or equal to 15 ℃ (12 ℃ to 25 ℃, the graduation: 0.1 ℃, the default value of 15 ℃), and the alarm is given: the water inlet temperature is too high, but the machine is not stopped.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention is characterized in that a temperature sensor T1 and a pressure sensor PS1 are connected on an inlet pipeline of a condenser, a temperature sensor T2 is connected on an outlet pipeline of the condenser, a temperature sensor T5 is connected on an inlet pipeline of the condenser, a temperature sensor T6 and an electric two-way valve are connected on an outlet pipeline of the condenser, a temperature sensor T3 and a pressure sensor PS2 are connected on an inlet pipeline of a fluorine pump, a temperature sensor T4 and a pressure sensor PS3 are connected on an outlet pipeline of the fluorine pump, a bypass pipeline is connected on a pipeline connecting the fluorine pump and an electronic expansion valve, the other end of the bypass pipeline is connected on the inlet pipeline of the condenser, a bypass electromagnetic valve is connected on the bypass pipeline, a temperature sensor T7 and a pressure sensor PS4 are connected on the inlet pipeline of the electronic expansion valve, a temperature sensor T8 and a pressure sensor PS 36, the evaporator is also provided with a return air temperature and humidity sensor and an outlet air temperature and humidity sensor. The invention installs temperature sensor T1 and pressure sensor PS1 on the inlet pipeline of the condenser, installs temperature sensor T2 on the outlet pipeline, installs temperature sensor T5 on the inlet pipeline, and installs temperature sensor T6 and electric two-way valve on the outlet pipeline, thus can detect the inlet water temperature, outlet water temperature, inlet pressure, outlet temperature of the condenser at any time, after obtaining these data, it is convenient for the corresponding control, meanwhile, the invention also adds the bypass pipeline, under the condition that the consumption of the condensing agent is not big, can bypass some refrigerant to return to the condenser, firstly, achieve the purpose of energy saving, but can cool the refrigerant after refrigerating, make the heat radiation effect of the condenser better. The air-out temperature and humidity sensor and the air-return temperature and humidity sensor are arranged on the evaporator, so that the air-conditioning system is convenient to adjust the refrigeration requirement and control the whole air-conditioning system due to the detection of the air-return temperature and humidity and the air-out temperature and humidity.
2. The pipeline connecting the condenser and the fluorine pump is also connected in parallel with a branch pipeline, the branch pipeline is connected with a liquid storage device, the inlet and the outlet of the liquid storage device are both connected with ball valves, the pipeline connecting the condenser and the fluorine pump is provided with a ball valve, and the liquid storage device is connected with a liquid level switch. The liquid storage device is used for storing the refrigerant, the amount of the refrigerant can be adjusted when the refrigerant is excessive, the refrigerant is provided under the condition that the refrigerant is insufficient, and the liquid level switch is used for measuring the amount of the refrigerant in the liquid storage device to achieve the effect of warning that the amount of the refrigerant is insufficient.
3. The invention relates to a fluorine pump, which comprises two fluorine pumps connected in parallel, wherein the inlets and outlets of the two fluorine pumps are connected with ball valves, and the outlets of the two fluorine pumps are connected with one-way valves. One working of the two fluorine pumps is standby, so that the two fluorine pumps can be switched to use, and when a fault occurs, the refrigerating system can also work normally, and the stability is higher.
4. The invention provides a control method of an air conditioning system, which comprises an inner machine control method and an outer machine control method, wherein the inner machine control method comprises an inner machine starting-up control method and an electronic expansion valve opening degree control method, and the outer machine control method comprises an outer machine starting-up control method, an electric two-way valve opening degree control method, a bypass electromagnetic valve control method, a fluorine pump switching control method, a liquid level switch control method and a condenser inlet water temperature control method. Through these controls, can in good time control the temperature in the computer lab, guarantee temperature constant temperature and humidity in the computer lab, two fluorine pumps, a reserve, a work, and can also switch after long-time operation, can guarantee that data center computer lab 24 hours is incessant to be moved all the day, the computer lab air conditioner can realize long-term incessant operation and have high reliability, be difficult for breaking down, can let the condition that condensation can not appear in electrical apparatus spare such as computer lab server through these accurate controls, usable multiple cold source, like building central air conditioning's refrigerated water, nature cold source etc.. Water only enters the condenser and does not enter the data center machine room. The water leakage can be avoided, and the safety of the electronic equipment in the machine room is endangered.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic diagram of the internal machine structure of the present invention.
Reference numeral 1, a condenser, 2, a fluorine pump, 3, an evaporator, 4, an electronic expansion valve, 5, temperature sensors T1, 6, pressure sensors PS1, 7, temperature sensors T2, 8, temperature sensors T5, 9, temperature sensors T6, 10, an electric two-way valve, 11, temperature sensors T3, 12, pressure sensors PS2, 13, temperature sensors T4, 14, pressure sensors PS3, 15, a bypass line, 16, a bypass solenoid valve, 17, temperature sensors T7, 18, pressure sensors PS4, 19, temperature sensors T8, 20, pressure sensors PS5, 21, a branch line, 22, a reservoir, 23, 24, a liquid level switch, a ball valve, 25, a check valve, 26, a dry filter, 27, a liquid viewing mirror.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
The invention provides a machine room air conditioning system which comprises an outer machine (shown in figure 1) and an inner machine (shown in figure 2), wherein the outer machine is connected with the inner machine, the outer machine comprises a condenser (1) and a fluorine pump (2), the inner machine comprises an evaporator (3) and an electronic expansion valve (4), an outlet of the condenser (1) is connected with an inlet of the fluorine pump (2) through a pipeline, an outlet of the fluorine pump (2) is connected with an inlet of the electronic expansion valve (4) through a pipeline, an outlet of the electronic expansion valve (4) is connected with an inlet of the evaporator (3) through a pipeline, an outlet of the evaporator (3) is connected with an inlet of the condenser (1), an inlet pipeline of the condenser (1) is connected with a temperature sensor T1 (5) and a pressure sensor PS1 (6), an outlet pipeline of the condenser (1) is connected with a temperature sensor T2 (7), and an inlet pipeline of the condenser (1) is connected with a temperature sensor T5, the condenser is characterized in that a water outlet pipeline of the condenser (1) is connected with a temperature sensor T6 (9) and an electric two-way valve (10), an inlet pipeline of the fluorine pump (2) is connected with a temperature sensor T3 (11) and a pressure sensor PS2 (12), an outlet pipeline of the fluorine pump (2) is connected with a temperature sensor T4 (13) and a pressure sensor PS3 (14), a bypass pipeline (15) is connected on a pipeline connected with the electronic expansion valve (4), the other end of the bypass pipeline (15) is connected on the inlet pipeline of the condenser (1), a bypass electromagnetic valve (16) is connected on the bypass pipeline (15), a temperature sensor T7 (17) and a pressure sensor PS4 (18) are connected on an inlet pipeline of the electronic expansion valve (4), a temperature sensor T8 (19) and a pressure sensor PS5 (20) are connected on an outlet pipeline of the evaporator (3), and the evaporator (3) is also provided with a return air temperature and humidity sensor and an outlet air temperature and humidity sensor.
Still parallelly connected branch pipeline (21) on the pipeline that condenser (1) and fluorine pump (2) link to each other, be connected with reservoir (22) on branch pipeline (21), the import and the export of reservoir (22) all are connected with ball valve (23), install ball valve (23) on the pipeline that condenser (1) and fluorine pump (2) link to each other, reservoir (22) are connected with liquid level switch (24).
The two fluorine pumps (2) are connected in parallel.
The inlet and the outlet of the two fluorine pumps (2) are both connected with ball valves (23), and the outlets of the two fluorine pumps (2) are both connected with one-way valves (25).
Still install drier-filter (26) and ball valve (23) on the pipeline that fluorine pump (2) and electronic expansion valve (4) link to each other, also be connected with ball valve (23) on the pipeline that evaporimeter (3) and condenser (1) link to each other.
And a liquid sight glass (27) is arranged on an outlet pipeline and an inlet pipeline of the drying filter (26).
The condenser is a plate heat exchanger, a sleeve type condenser, a shell and tube type condenser and other water-cooled condensers.
The invention also provides a control method of the air conditioning system, which comprises an inner machine control method and an outer machine control method, wherein the inner machine control method comprises an inner machine starting-up control method and an electronic expansion valve opening degree control method, and the outer machine control method comprises an outer machine starting-up control method, an electric two-way valve opening degree control method, a bypass electromagnetic valve control method, a fluorine pump switching control method, a liquid level switch control method and a condenser inlet water temperature control method.
The internal machine starting control method specifically comprises the following steps:
when: when the detection value is larger than the set value and dead zone, the refrigeration demand = ((detection value-set value-dead zone)/precision) × 100%;
when: when the set value-dead zone is not more than the detected value and not more than the set value + dead zone, the refrigeration requirement = 0;
when: when the detected value is less than the set value-dead zone, the refrigeration requirement = ((detected value-set value + dead zone)/precision) × 100%;
when the refrigeration demand is more than 0, the internal machine is started to operate, the refrigeration demand is less than-100%, and the internal machine stops operating; when the internal machine is started to operate, the internal machine can be stopped only when the refrigeration demand is less than-100%, and when the internal machine is stopped to operate, the internal machine can be started to operate only when the refrigeration demand is greater than 0.
The detection value is the detection value of the return air temperature of the evaporator, namely the detection value of the return air temperature and humidity sensor, the set value is the set value of the return air temperature of the evaporator, a user can set the return air temperature according to the actual situation, and the set value is
The default of the temperature is 35 ℃ at 28-40 ℃, the dead zone is the dead zone temperature, the set value is 0.5-2 ℃, and the default value is 1 ℃. The precision refers to the precision requirement of the return air temperature of the evaporator, and a user can set the precision by himself, wherein the set value is 1-10 ℃, and the default is 1 ℃.
The opening control method of the electronic expansion valve comprises the following specific steps:
when: when the detected value is greater than the set value + dead zone, the requirement = ((detected value-set value-dead zone)/precision) × 100%;
when: when the set value-dead zone is not more than the detection value and not more than the set value + dead zone, the requirement = 0;
when: requirement = ((detection value-set value + dead zone)/precision) × 100% when the detection value is < set value-dead zone;
when the requirement is less than or equal to 0%, the minimum opening degree of the electronic expansion valve is determined;
when the demand is more than or equal to 100%, the maximum opening degree of the electronic expansion valve is achieved;
when the requirement is more than or equal to 0% and less than or equal to 100%, the opening of the electronic expansion valve is in direct proportion to the requirement;
the detection value is a detection value of the outlet air temperature of the evaporator, namely a value detected by the outlet air temperature and humidity sensor, the outlet air temperature set value is a set value of the outlet air temperature of the evaporator, the set value is 17-28 ℃, the default value is 24 ℃, the dead zone is a dead zone temperature, the set value is 0.5-2 ℃, and the default value is 1 ℃. The precision refers to the precision requirement of the air outlet temperature of the evaporator, and a user can set the precision by himself, wherein the set value is 1-10 ℃, and the default is 1 ℃.
And (3) controlling an evaporation fan of the evaporator: the evaporation fan is an EC fan, the EC fan has selectable constant speed mode and temperature difference average, the specific mode selection adjusts the operation according to the dead zone and the precision,
the starting control method of the external unit specifically comprises the following steps: starting the machine set, enabling the machine set to be in a standby state, enabling the electric two-way valve to be in a minimum opening degree, detecting an inner machine, starting the fluorine pump when the inner machine has a refrigeration requirement (when a liquid path electromagnetic valve of the inner machine is opened), and stopping the fluorine pump when the liquid path electromagnetic valve of the inner machine is completely closed, wherein the electric two-way valve is in the minimum opening degree.
The method for controlling the opening degree of the electric two-way valve comprises the following steps:
when: when the temperature sensor T2 is less than or equal to Ta, the electric two-way valve keeps the minimum opening degree, the default of Ta is 12 ℃, the 10 ℃ to 20 ℃ can be set, the graduation is 0.1 ℃, the default of Omin is 20%, the default of 10% to 50% can be set, and the graduation is 1%.
When: when the temperature sensor T2 is larger than or equal to Tb and Tb is larger than Ta, the electric two-way valve keeps the maximum opening Omax to operate, the Tb defaults to 14 ℃, the temperature is 10-20 ℃, the graduation is 0.1 ℃, the Omax defaults to 100%, the temperature is 60-100%, and the graduation is 1%.
When: when Ta is more than T2 and less than Tb, the electric two-way valve carries out PID control adjustment from Omin to Omax according to requirements, and the algorithm of the PID control adjustment is as follows: the parameter P is set by the system between 50 and 200; the parameter I is set by the user between 100 and 210, and the parameter D is set by the user between 0 and 100;
current error: current _ err = set temperature value Ta — current temperature value T2; last error: last _ err = prev _ err (last error); last error: prev _ err = current _ err; the meaning is that if the current temperature value is tested for three times in three time periods, the error obtained in the first test is recorded as the current error, after the second test, the error in the first test is recorded as the last error, the second error is recorded as the current error, after the third test, the error in the third test is recorded as the current error, the error in the second test is recorded as the last error, the error in the first test is recorded as the last error, and the error in the third test is recorded as the current error.
Request = P (current _ err-prev _ err) + I current _ err + D (current _ err-2 prev _ err + last _ err),
when the Request is larger than 0, the opening requirement of the electric two-way valve is not met, and the minimum opening Omin of the electric two-way valve is maintained.
When the Request is < 0,
the two-way valve opening degree O = | Request | ÷ 100 + Omin; (Omin < O < Omax).
For example: first measured error = set temperature value Ta-current temperature value T2, assuming Ta =12, T2=12.5, then first measured error = Ta-T2 = -0.5, assuming second measured T2=11, second measured error =1, assuming third measured T2=11.5, third measured error is 0.5. Thus, current error current _ err =0.5, last error: last _ err =1, last error prev _ err = -0.5, Request = P [ ((current _ err-prev _ err) + I [ ] current _ err + D [ ((current _ err-2 [ ] _ prev _ err + last _ err) =135 [ (-0.5- (-0.5)) +100 [ (-0.5) +10 ] =175 > 0, and the electric two-way valve maintains minimum opening Omin.
The bypass electromagnetic valve control method specifically comprises the following steps:
a fluorine pump inlet pressure P2 (unit: bar) a fluorine pump outlet pressure P3 (unit: bar), a default bypass solenoid valve ON pressure of 5.5bar, and when P3-P2= 5.5bar, the bypass solenoid valve is opened (the bypass solenoid valve ON pressure can be set in the range of 2-8bar, and the division =0.1 bar);
default bypass solenoid OFF pressure is 4.5bar, when P3-P2=4.5bar, and ON pressure > OFF pressure, bypass solenoid is closed (bypass solenoid OFF pressure settable range: 2-8bar, division =0.1 bar).
The fluorine pump switching control method specifically comprises the following steps:
the running time of one fluorine pump reaches 720h (1 h to 3000h can be set, the graduation is 1h, the default value is 720 h), and the other fluorine pump is switched to run;
when the fluorine pump runs, the pressure difference between the outlet and the inlet of the fluorine pump needs to be detected: P3-P2; P3-P2 is less than or equal to 1.2bar, (0 to 5bar can be set, the division ratio is 0.1bar, and the default value is 1.2 bar); duration 60s, (0 to 600s can be set, graduation: 1s, default 60 s), switching the fluorine pump to operate, and outputting an alarm: "several # fluorine pump failure";
when the operation of the other fluorine pump is switched, detecting the inlet-outlet pressure difference of the fluorine pump by delaying 60s (the delay time can be set from 0 to 600s, the graduation is 1s, and the default value is 60 s);
under the condition that the '1 # fluorine pump fault' and the '2 # fluorine pump fault' are not removed, the current fluorine pump is maintained to be operated, one fluorine pump fault can be automatically removed, two fluorine pump faults can be only manually removed, and the alarm condition is removed: fluorine pump outlet and inlet differential pressure: P3-P2 is more than or equal to 2 bar; due to the difference between the outlet pressure and the inlet pressure of the fluorine pump: the fault of the fluorine pump caused by P3-P2 being less than or equal to 1.2bar, the fluorine pump is not stopped; when the fluorine pumps are switched, the running fluorine pumps stop running, and after the time delay of 5s, the other fluorine pump is started.
The liquid level switch control method specifically comprises the following steps:
when the fluorine pump is running, the float liquid level switch is switched on, and the duration: 30s, warning: "insufficient refrigerant". But not shut down.
The method for controlling the inlet water temperature of the condenser specifically comprises the following steps:
when the fluorine pump runs, the water inlet temperature T5 of the condenser needs to be detected, T5 is more than or equal to 15 ℃ (12 ℃ to 25 ℃, the graduation: 0.1 ℃, the default value of 15 ℃), and the alarm is given: the water inlet temperature is too high, but the machine is not stopped.
Claims (5)
1. A control method of a machine room air conditioning system is characterized by comprising the following steps: the device comprises an outer machine and an inner machine, wherein the outer machine is connected with the inner machine, the outer machine comprises a condenser and a fluorine pump, the inner machine comprises an evaporator and an electronic expansion valve, an outlet of the condenser is connected with an inlet of the fluorine pump, an outlet of the fluorine pump is connected with an inlet of the electronic expansion valve, an outlet of the electronic expansion valve is connected with an inlet of the evaporator, an inlet pipeline of the condenser is connected with a temperature sensor T1 and a pressure sensor PS1, an outlet pipeline of the condenser is connected with a temperature sensor T2, an inlet pipeline of the condenser is connected with a temperature sensor T5, an outlet pipeline of the condenser is connected with a temperature sensor T6 and an electric two-way valve, an inlet pipeline of the fluorine pump is connected with a temperature sensor T3 and a pressure sensor PS2, an outlet pipeline of the fluorine pump is connected with a temperature sensor T4 and a pressure sensor PS3, and a pipeline connecting the fluorine, the other end of the bypass pipeline is connected to an inlet pipeline of the condenser, a bypass electromagnetic valve is connected to the bypass pipeline, a temperature sensor T7 and a pressure sensor PS4 are connected to the inlet pipeline of the electronic expansion valve, a temperature sensor T8 and a pressure sensor PS5 are connected to an outlet pipeline of the evaporator, and the evaporator is further provided with an air return temperature and humidity sensor and an air outlet temperature and humidity sensor;
a branch pipeline is also connected in parallel with the pipeline connecting the condenser and the fluorine pump, a liquid storage device is connected on the branch pipeline, a ball valve is connected with an inlet and an outlet of the liquid storage device, a ball valve is installed on the pipeline connecting the condenser and the fluorine pump, and the liquid storage device is connected with a liquid level switch; the two fluorine pumps are connected in parallel; a pipeline connecting the fluorine pump and the electronic expansion valve is also provided with a dry filter, a liquid path electromagnetic valve and a ball valve, and a pipeline connecting the evaporator and the condenser is also connected with the ball valve;
the control method of the machine room air conditioning system further comprises an internal machine control method and an external machine control method, the internal machine control method comprises an internal machine startup control method, and the internal machine startup control method specifically comprises the following steps:
when: when the detection value is larger than the set value and dead zone, the refrigeration demand = ((detection value-set value-dead zone)/precision) × 100%;
when: when the set value-dead zone is not more than the detected value and not more than the set value + dead zone, the refrigeration requirement = 0;
when: when the detected value is less than the set value-dead zone, the refrigeration requirement = ((detected value-set value + dead zone)/precision) × 100%;
when the refrigeration demand is more than 0, the internal machine is started to operate, the refrigeration demand is less than-100%, and the internal machine stops operating; when the internal machine is started to operate, the internal machine can be stopped only when the refrigeration requirement is less than-100%, and when the internal machine is stopped to operate, the internal machine can be started to operate only when the refrigeration requirement is greater than 0;
the control method of the external machine comprises an opening control method of an electric two-way valve, and specifically comprises the following steps:
when: when the temperature sensor T2 is less than or equal to Ta, the electric two-way valve keeps the minimum opening degree and operates in Omin, wherein Ta = 10-20 ℃, and Omin = 10-50%;
when: when the temperature sensor T2 is more than or equal to Tb and Tb is more than Ta, the electric two-way valve keeps the maximum opening and operates at Omax, Tb = 10-20 ℃, and Omax = 60-100%;
when: when Ta is more than T2 and less than Tb, the electric two-way valve carries out PID control adjustment from Omin to Omax according to requirements, and the algorithm of the PID control adjustment is as follows: the parameter P is set by the system between 50 and 200; the parameter I is set by the user between 100 and 210, and the parameter D is set by the user between 0 and 100;
current error: current _ err = set temperature value Ta — current temperature value T2;
last error: last _ err = prev _ err;
last error: prev _ err = current _ err;
request = P (current _ err-prev _ err) + I current _ err + D (current _ err-2 prev _ err + last _ err),
when the Request is larger than 0, the opening requirement of the electric two-way valve is not met, and the electric two-way valve maintains the minimum opening Omin;
when the Request is less than 0, the opening degree of the electric two-way valve is = | Request | ÷ 100 + Omin; (Omin < electric two-way valve opening < Omax) the external machine control method comprises an electric two-way valve opening control method, and specifically comprises the following steps:
when: when the temperature sensor T2 is less than or equal to Ta, the electric two-way valve keeps the minimum opening degree and operates in Omin, wherein Ta = 10-20 ℃, and Omin = 10-50%;
when: when the temperature sensor T2 is more than or equal to Tb and Tb is more than Ta, the electric two-way valve keeps the maximum opening and operates at Omax, Tb = 10-20 ℃, and Omax = 60-100%;
when: when Ta is more than T2 and less than Tb, the electric two-way valve carries out PID control adjustment from Omin to Omax according to requirements, and the algorithm of the PID control adjustment is as follows: the parameter P is set by the system between 50 and 200; the parameter I is set by the user between 100 and 210, and the parameter D is set by the user between 0 and 100;
current error: current _ err = set temperature value Ta — current temperature value T2;
last error: last _ err = prev _ err;
last error: prev _ err = current _ err;
request = P (current _ err-prev _ err) + I current _ err + D (current _ err-2 prev _ err + last _ err),
when the Request is larger than 0, the opening requirement of the electric two-way valve is not met, and the electric two-way valve maintains the minimum opening Omin;
when the Request is less than 0, the opening degree of the electric two-way valve is = | Request | ÷ 100 + Omin; (Omin < electric two-way valve opening < Omax).
2. The control method of the machine room air conditioning system according to claim 1, characterized in that: the internal machine control method further comprises an electronic expansion valve opening degree control method, and specifically comprises the following steps:
when: when the outlet air temperature detection value is larger than the outlet air temperature set value + dead zone, the requirement = ((outlet air temperature detection value-outlet air temperature set value-dead zone)/precision) × 100%;
when: when the air outlet temperature set value-dead zone is less than or equal to the air outlet temperature detection value is less than or equal to the air outlet temperature set value + dead zone, the requirement = 0;
when: when the outlet air temperature detection value is less than the outlet air temperature set value-dead zone, the requirement = ((outlet air temperature detection value-outlet air temperature set value + dead zone)/precision) = 100%;
when the requirement is less than or equal to 0%, the minimum opening degree of the electronic expansion valve is determined;
when the demand is more than or equal to 100%, the maximum opening degree of the electronic expansion valve is achieved;
when the requirement is more than or equal to 0% and less than or equal to 100%, the opening of the electronic expansion valve is in direct proportion to the requirement;
the minimum superheat degree of the electronic expansion valve is 0.5-1K.
3. The control method of the machine room air conditioning system according to claim 1, characterized in that: the control method of the external machine further comprises a bypass electromagnetic valve control method, and specifically comprises the following steps:
the inlet pressure P2 of the fluorine pump, the outlet pressure P3 of the fluorine pump, the ON pressure value of the bypass electromagnetic valve is set manually, the range of the set value is 2-8bar, when the detected P3-P2= the ON pressure value of the bypass electromagnetic valve, the bypass electromagnetic valve is opened; the OFF pressure value of the bypass solenoid valve is manually set, the set value ranges from 2bar to 8bar, and when the detected P3-P2= the OFF pressure value bar of the bypass solenoid valve and the ON pressure > the OFF pressure, the bypass solenoid valve is closed.
4. The control method of the machine room air conditioning system according to claim 1, characterized in that: the outdoor unit control method further comprises a fluorine pump switching control method, and specifically comprises the following steps:
when the running time of one fluorine pump reaches the set switching running time, switching to the running of the other fluorine pump, wherein the set range of the switching running time is 1-3000 h;
when the fluorine pump runs, the pressure difference between the outlet and the inlet of the fluorine pump needs to be detected: when the pressure difference is not less than the set value of the pressure difference from P3 to P2 and the duration is not less than the set value of the duration, the fluorine pump is switched to operate, and an alarm is output: "several # fluorine pump failure", said pressure differential set point is in the range of 0-5bar and said duration set point is in the range of 0-600 s;
when the operation of another fluorine pump is switched, detecting the pressure difference of an inlet and an outlet of the fluorine pump after a delay set value is set, wherein the range of the delay set value is 0-600 s;
under the condition that the '1 # fluorine pump fault' and the '2 # fluorine pump fault' are not removed, the current fluorine pump is maintained to be operated, one fluorine pump fault can be automatically removed, two fluorine pump faults can be only manually removed, and the alarm condition is removed: fluorine pump outlet and inlet differential pressure: P3-P2 is more than or equal to 2 bar; due to the difference between the outlet pressure and the inlet pressure of the fluorine pump: the fault of the fluorine pump caused by P3-P2 being less than or equal to 1.2bar, the fluorine pump is not stopped; when the fluorine pumps are switched, the running fluorine pumps stop running, and after the time delay of 5s, the other fluorine pump is started.
5. The control method of the machine room air conditioning system according to claim 1, characterized in that: the outdoor unit control method also comprises a condenser inlet water temperature control method, which specifically comprises the following steps:
when the fluorine pump runs, the water inlet temperature T5 of the condenser needs to be detected, and when the temperature T5 is not less than the set water temperature, an alarm is given: the water inlet temperature is too high, but the machine is not stopped, and the set temperature range of the water temperature is 12-25 ℃.
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| EP3819551A1 (en) * | 2019-11-07 | 2021-05-12 | E.ON Sverige AB | Method and control unit for controlling a control valve controlling a flow of heat transfer fluid into a thermal energy extraction unit |
| CN112378037B (en) * | 2020-11-13 | 2022-03-18 | 青岛海信电子设备股份有限公司 | Air-cooled fluorine pump air conditioning system and control method thereof |
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