CN113551393B - Low-load dehumidification control method and device and air conditioning system - Google Patents

Low-load dehumidification control method and device and air conditioning system Download PDF

Info

Publication number
CN113551393B
CN113551393B CN202110815030.8A CN202110815030A CN113551393B CN 113551393 B CN113551393 B CN 113551393B CN 202110815030 A CN202110815030 A CN 202110815030A CN 113551393 B CN113551393 B CN 113551393B
Authority
CN
China
Prior art keywords
compressor
air
load
temperature
humidity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110815030.8A
Other languages
Chinese (zh)
Other versions
CN113551393A (en
Inventor
张思秀
吴宇涵
吴启博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fiberhome Telecommunication Technologies Co Ltd
Original Assignee
Fiberhome Telecommunication Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fiberhome Telecommunication Technologies Co Ltd filed Critical Fiberhome Telecommunication Technologies Co Ltd
Priority to CN202110815030.8A priority Critical patent/CN113551393B/en
Publication of CN113551393A publication Critical patent/CN113551393A/en
Application granted granted Critical
Publication of CN113551393B publication Critical patent/CN113551393B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • 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

Abstract

The application discloses a low-load dehumidification control method, a control device and an air conditioning system, and relates to the technical field of air conditioning refrigeration, wherein the method comprises the following steps: connecting hot gas bypass valves at two ends of a compressor of the air conditioning unit; when the air conditioning unit is in a preset operation state and the return air humidity is greater than a humidity threshold value, adjusting the load of a compressor and setting the air conditioning unit for air supply control; selecting a mode of adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the supply air temperature is greater than a first temperature threshold, the load of the compressor is increased; if the air supply temperature is lower than a second temperature threshold value, the load of the compressor is reduced; if the load of the compressor is reduced to the minimum value, the hot gas bypass valve is opened, and the mode of adjusting the opening of the hot gas bypass valve and the load of the compressor is adopted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value. This application can make air conditioning unit satisfy the stable dehumidification under the lower state of data center computer lab load, and the dehumidification effect is better.

Description

Low-load dehumidification control method and device and air conditioning system
Technical Field
The application relates to the technical field of air conditioner refrigeration, in particular to a low-load dehumidification control method, a control device and an air conditioning system.
Background
Currently, with the rapid development of big data, the current data center becomes an important component of an enterprise production system, and is an important tool for enterprises to improve competitiveness and operation efficiency. Due to higher temperature, the failure rate of equipment in a service area is increased, the reliability is reduced, and even the equipment is down; high relative humidity can cause short circuit of data center equipment, error of magnetic tape media, corrosion of components and circuits, and in extreme cases, high humidity can also cause condensation on the surface of the equipment to cause short circuit. Therefore, the temperature and humidity in the data center machine room have clear requirements. According to GB50174-2017 electronic information machine room design specifications, the temperature range required by a machine room air conditioner is 18-27 ℃, and the humidity range required by the machine room air conditioner is 40-60%.
Based on the consideration of the whole cost, the data center selects the inter-row air conditioner or the room air conditioner of the fixed-frequency air cooling vortex compression. Because the compressor that the air conditioner configured is for deciding the scroll compressor of frequently or frequency conversion, its minimum load is higher, when the load in the computer lab is less than the minimum load of air conditioner, the frequent start-up of air conditioner can appear, if the humidity in the computer lab is greater than required humidity range this moment, then in the clearance of frequent start-stop, because the humidity that the sealed problem of computer lab caused reveals, can lead to the unable effectual dehumidification of stabilizing of air conditioning system, and then be difficult to solve the high wet hidden danger of computer lab to bring great risk for the operation of server.
In the correlation technique, when the computer lab air conditioner underloaded dehumidification, mostly pass through and reduce the amount of wind and dehumidify to because the air-out temperature is lower, the condition that the compressor frequently stops still can appear, still can dispose supplementary electrical heating, and not only the energy consumption is great, and the dehumidification operation when the computer lab load is less than the minimum load of air conditioner is unstable, and the effect is relatively poor.
Disclosure of Invention
In view of one of the defects in the prior art, an object of the present application is to provide a low-load dehumidification control method, a control device and an air conditioning system, so as to solve the problems of unstable dehumidification operation and poor dehumidification effect when the load of a machine room is lower than the minimum load of an air conditioner in the related art.
The first aspect of the present application provides a low-load dehumidification control method, which includes the steps of:
connecting hot gas bypass valves at two ends of a compressor of the air conditioning unit, wherein the hot gas bypass valves are in a normally closed state;
when the air conditioning unit is in a preset operation state and the return air humidity is greater than a humidity threshold value, adjusting the load of a compressor and setting the air conditioning unit for air supply control;
selecting a mode for adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the air supply temperature is greater than a first temperature threshold, the load of the compressor is increased; if the air supply temperature is lower than a second temperature threshold value, the load of the compressor is reduced;
if the load of the compressor is reduced to the minimum value, the hot gas bypass valve is opened, and the opening degree of the hot gas bypass valve and the load of the compressor are adjusted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
In some embodiments, according to the above-mentioned return air humidity and supply air temperature, a mode of adjusting the opening of the hot gas bypass valve and the load of the compressor is adopted, which specifically includes:
when the return air humidity is greater than the humidity threshold value, if the supply air temperature is greater than a first temperature threshold value and the hot air bypass valve is in an open state, the opening degree of the hot air bypass valve is reduced; if the air supply temperature is higher than the first temperature threshold value and the hot gas bypass valve is in a closed state, the load of the compressor is increased; and if the air supply temperature is lower than the second temperature threshold value, the opening degree of the hot gas bypass valve is increased.
In some embodiments, each time the hot gas bypass valve opening or the compressor load is adjusted, further comprising:
and adjusting the opening degree of the liquid supply valve and keeping the preset suction superheat degree.
In some embodiments, after each compressor load increase, it is determined whether the return air humidity is greater than a humidity threshold;
and judging whether the load of the compressor is reduced to the minimum value or not after each load reduction of the compressor, and judging whether the air supply temperature is smaller than a second temperature threshold value again when the load of the compressor is not reduced to the minimum value.
In some embodiments, if the supply air temperature is not greater than the first temperature threshold and not less than the second temperature threshold, the control parameter of the air conditioning unit is kept unchanged, and the mode of adjusting the load of the compressor is selected again according to the return air humidity and the supply air temperature.
In some embodiments, the preset operation state is: the air conditioning unit is in an operating state, and the air supply temperature is greater than a third temperature threshold value;
the third temperature threshold is smaller than the first temperature threshold and larger than the second temperature threshold, and the first temperature threshold is smaller than the dew point temperature of the third temperature threshold group of the air conditioner.
In some embodiments, when the hot gas bypass valve is open, the hot gas bypass valve is closed if the return air humidity is not greater than a humidity threshold.
A second aspect of the present application provides a control device for implementing the above low-load dehumidification control method, including:
the low-load dehumidification mode selection module is used for adjusting the load of the compressor and setting the air conditioning unit for air supply control when the air conditioning unit is in a preset running state and the return air humidity is greater than a humidity threshold value;
the first control module is used for selecting a mode of adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the air supply temperature is greater than a first temperature threshold, the adjusting module is used for controlling the load increase of the compressor; if the air supply temperature is lower than the second temperature threshold value, the adjusting module is used for controlling the load reduction of the compressor;
and the second control module is used for opening the hot gas bypass valve when the load of the compressor is reduced to the minimum value, and adopting a mode of adjusting the opening of the hot gas bypass valve and the load of the compressor again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
A third aspect of the present application provides an air conditioning system, which includes the above control device, and further includes an air conditioning unit, where the air conditioning unit includes:
the main loop is formed by sequentially communicating a compressor, a condenser and an evaporator, and a liquid supply valve is arranged between the condenser and the evaporator;
the two ends of the hot gas bypass valve are communicated with the two ends of the compressor through pipelines;
the compressor, the liquid supply valve and the hot gas bypass valve are respectively connected with a control device.
In some embodiments, the air conditioning system further includes:
the first temperature and humidity sensor is arranged at the air return opening of the evaporator and used for collecting the air return temperature and the air return humidity;
the second temperature and humidity sensor is arranged at the air supply outlet of the evaporator and is used for collecting the air supply temperature and the air supply humidity;
the pressure sensor is arranged between the evaporator and the compressor and used for collecting the suction pressure of the compressor;
the air suction temperature sensor is arranged between the evaporator and the compressor and used for collecting the air suction temperature of the compressor;
and the rotating speed sensor is used for acquiring the rotating speed of the compressor.
The beneficial effect that technical scheme that this application provided brought includes:
according to the low-load dehumidification control method, the control device and the air conditioning system, the hot gas bypass valves are connected to two ends of a compressor of the air conditioning unit and are in the normally closed state, when the air conditioning unit is in the preset operation state and the return air humidity is greater than the humidity threshold value, the load of the compressor is adjusted, the air conditioning unit is set to be air supply control, at the moment, the mode of adjusting the load of the compressor is selected according to the return air humidity and the air supply temperature, and when the return air humidity is greater than the humidity threshold value, if the air supply temperature is greater than the first temperature threshold value, the load of the compressor is increased; if the air supply temperature is lower than a second temperature threshold value, the load of the compressor is reduced; if the load of the compressor is reduced to the minimum value, a hot gas bypass valve is opened, and the opening of the hot gas bypass valve and the load of the compressor are adjusted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value; therefore, by configuring the bypass function and combining the adjustment of the opening of the hot gas bypass valve and the load of the compressor, the air conditioning unit not only can stably dehumidify the data center machine room in a low load state, but also has a good dehumidification effect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a first flowchart of a low-load dehumidification control method according to an embodiment of the present application;
FIG. 2 is a temperature profile of an air supply according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an air conditioning unit according to an embodiment of the present application;
FIG. 4 is a flowchart of steps A1-A10, A18 and a method for controlling low load dehumidification according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating steps A10-A18 of a method for controlling low load dehumidification according to an embodiment of the present application.
Reference numerals:
1. a compressor; 2. a condenser; 3. a liquid supply valve; 4. an evaporator; 5. drying the filter; 6. a liquid supply tube sight glass; 7. a hot gas bypass valve; 8. a first temperature and humidity sensor; 9. a second temperature and humidity sensor; 10. a pressure sensor; 11. and an intake air temperature sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present application provides a low-load dehumidification control method applied to an air-conditioning system of an air-cooling room, where the method includes:
s1, connecting hot gas bypass valves at two ends of a compressor of an air conditioning unit, wherein the hot gas bypass valves are in a normally closed state.
And S2, when the air conditioning unit is in a preset running state and the return air humidity is greater than a humidity threshold value, adjusting the load of the compressor and setting the air conditioning unit for air supply control.
Wherein the air supply set temperature of the air supply control is 18 ℃. When the set temperature of the air supply is set to be 18 ℃, the dehumidification function can be achieved, and the condition that the set temperature of the air supply is too low, which causes the temperature in the machine room to exceed the specified range of 18-27 ℃ is avoided.
S3, selecting a mode of adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the air supply temperature is greater than a first temperature threshold, the load of the compressor is increased; and if the air supply temperature is less than the second temperature threshold value, the load of the compressor is reduced.
At the moment, when the return air humidity is smaller than the humidity threshold value, the low-load dehumidification is stopped, and the air conditioning unit resumes the set operation control. In addition, if the air supply temperature is not greater than the first temperature threshold and not less than the second temperature threshold, the working state of the air conditioning unit is kept, and the mode of adjusting the load of the compressor is selected again according to the return air humidity and the air supply temperature, namely, the control parameters of the air conditioning unit are kept unchanged, and then whether the return air humidity is greater than the humidity threshold is judged again.
And S4, if the load of the compressor is reduced to the minimum value, opening a hot gas bypass valve, and adjusting the opening of the hot gas bypass valve and the load of the compressor again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
And if the return air humidity is not greater than the humidity threshold value, stopping low-load dehumidification, wherein the humidity threshold value is 60%.
According to the low-load dehumidification control method, the hot gas bypass valves are connected to the two ends of the compressor of the air conditioning unit and are in the normally closed state, when the air conditioning unit is in the preset operation state and the return air humidity is greater than the humidity threshold value, the load of the compressor is adjusted, the air conditioning unit is set to be air supply control, at the moment, the mode of adjusting the load of the compressor is selected according to the return air humidity and the air supply temperature, and when the return air humidity is greater than the humidity threshold value, if the air supply temperature is greater than the first temperature threshold value, the load of the compressor is increased; if the air supply temperature is lower than a second temperature threshold value, the load of the compressor is reduced; if the load of the compressor is reduced to the minimum value, a hot gas bypass valve is opened, and the opening of the hot gas bypass valve and the load of the compressor are adjusted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value; therefore, by configuring the bypass function and combining the adjustment of the opening of the hot gas bypass valve and the load of the compressor, the air conditioning unit not only can stably dehumidify the data center machine room in a low load state, but also has a good dehumidification effect.
In addition to the above embodiment, in the present embodiment, in the step S4, a method of adjusting the opening of the hot-gas bypass valve and the load of the compressor according to the return air humidity and the supply air temperature includes:
when the return air humidity is greater than the humidity threshold value, if the supply air temperature is greater than a first temperature threshold value and the hot air bypass valve is in an open state, the opening degree of the hot air bypass valve is reduced; if the air supply temperature is higher than the first temperature threshold value and the hot gas bypass valve is in a closed state, the load of the compressor is increased; and if the air supply temperature is lower than the second temperature threshold value, the opening degree of the hot gas bypass valve is increased.
If the air supply temperature is not greater than the first temperature threshold and not less than the second temperature threshold, the working state of the air conditioning unit is kept, namely the control parameters of the air conditioning unit are kept unchanged, and the mode of adjusting the opening of the hot air bypass valve and the load of the compressor is selected again according to the return air humidity and the air supply temperature.
Preferably, each time the hot gas bypass valve opening or the compressor load is adjusted, the method further comprises the steps of:
adjusting the opening degree of the liquid supply valve, keeping the preset suction superheat degree, namely taking the preset suction superheat degree as a target value, and increasing the opening degree of the liquid supply valve when the actual suction superheat degree is larger than the preset suction superheat degree; and when the actual air suction superheat degree is smaller than the preset air suction superheat degree, reducing the opening degree of the liquid supply valve.
In this embodiment, the preset suction superheat is 10 ℃, that is, the opening of the liquid supply valve needs to be adjusted each time the opening of the hot gas bypass valve or the load of the compressor is adjusted, so as to maintain the suction superheat at 10 ℃.
On the basis of the above embodiment, in this embodiment, when the mode of adjusting the load of the compressor is selected, after the load of the compressor is increased each time, whether the return air humidity is greater than the humidity threshold value is judged; if so, judging whether the air supply temperature is greater than the first temperature threshold value again; if not, namely the return air humidity is less than or equal to the humidity threshold value, the low-load dehumidification is stopped, and at the moment, the air conditioning unit resumes the set operation control.
Judging whether the load of the compressor is reduced to the minimum value or not after each load reduction of the compressor, and judging whether the air supply temperature is smaller than a second temperature threshold value again when the load of the compressor is not reduced to the minimum value; if so, reducing the load of the compressor, and judging whether the load of the compressor is reduced to the minimum value again; if not, namely the air supply temperature is greater than or equal to the second temperature threshold value, the working state of the air conditioning unit is kept, and whether the return air humidity is greater than the humidity threshold value is judged.
On the basis of the above embodiment, in this embodiment, the preset operation state is: the air conditioning unit is in an operating state, and the air supply temperature is greater than a third temperature threshold value. The air conditioning unit is in normal operation control at this time.
The third temperature threshold is smaller than the first temperature threshold and larger than the second temperature threshold, and the first temperature threshold is smaller than the dew point temperature of the air conditioning unit.
According to the GB50174-2017 specification, the control target of the environmental humidity of a data center machine room is 40% -60%, and the control target of the air supply temperature is 18-27 ℃; the dew point temperature T can be calculated according to the return air temperature of 37 ℃ and the humidity of 90 percent and the return air temperature of 27 ℃ and the humidity of 60 percent1-SAnd obtaining the dew point temperature T1-SThe range of (A) is as follows: 18.8-36.3 ℃. In this embodiment, the dry dew point temperature calculation formula of the wet air is a published formula, and is not described herein again.
According to the known dew point temperature T1-SThe target value T of the air supply temperature collected by the second temperature and humidity sensor can be obtained2-s. In this embodiment, the supply air temperature is less than the return air dew point temperature, i.e., T2-s＜T1-SWhen the air is used, the dehumidifying effect is achieved. In addition, according to the regulations of the national standard GB50174-2017, the environmental temperature of the machine room is 18-27 ℃, the air supply temperature is more than or equal to 18 ℃, and the machine room can be in a proper temperature range. Therefore, in the present embodiment, the target value T of the air supply temperature is set2-sIs 18 c, i.e. the third temperature threshold is 18 c. In this example, the first temperature threshold is 18.2 ℃ and the second temperature threshold is 17.5 ℃.
In other embodiments, the third temperature threshold may be equal to the first temperature threshold, i.e. both the third temperature threshold and the first temperature threshold are 18.2 ℃.
As shown in fig. 2, the return air temperature range is 27-37 ℃, and the return air humidity is 60-90%; correspondingly, the dew point temperature range of the return air is 18.8-36.3 ℃, the air supply temperature is 18.78 ℃, namely the air supply temperature is required to be lower than 18.78 ℃ to achieve the dehumidification effect.
In addition to the above embodiments, in this embodiment, when the hot gas bypass valve is in the open state, if the return air humidity is not greater than the humidity threshold value, the hot gas bypass valve is closed.
The embodiment of the application also provides a control device for realizing the low-load dehumidification control method, and the control device comprises a low-load dehumidification mode selection module, a first control module and a second control module.
The low-load dehumidification mode selection module is used for adjusting the load of the compressor and setting the air conditioning unit to be air supply control when the air conditioning unit is in a preset running state and the return air humidity is greater than a humidity threshold value.
The first control module is used for selecting a mode of adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the air supply temperature is greater than a first temperature threshold, the adjusting module is used for controlling the load increase of the compressor; and if the air supply temperature is less than the second temperature threshold value, the adjusting module is used for controlling the load reduction of the compressor.
When the compressor is loaded down to the minimum value, the second control module is used for opening the hot gas bypass valve, and the opening degree of the hot gas bypass valve and the load of the compressor are adjusted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
On the basis of the above embodiment, in this embodiment, the control device further includes a preset value module, where the preset value module is configured to set a humidity threshold value compared with return air humidity of the air conditioning unit, and a first temperature threshold value and a second temperature threshold value compared with supply air temperature of the air conditioning unit.
The embodiment of the application also provides an air conditioning system, which comprises the control device and an air conditioning unit.
As shown in fig. 3, the air conditioning assembly comprises a main circuit and a hot gas bypass valve 7. The main loop is formed by sequentially communicating a compressor 1, a condenser 2 and an evaporator 4, and a liquid supply valve 3 is arranged between the condenser 2 and the evaporator 4. Wherein, the liquid supply valve 3 is a main liquid supply electronic expansion valve, the condenser 2 is an air-cooled condenser, and the evaporator 4 is an air-cooled evaporator.
Optionally, the air conditioning unit may further include a gas-liquid separator, an oil separator, a low temperature starting assembly, etc., according to the control stability requirement of the air conditioning system.
Both ends of the hot gas bypass valve 7 are communicated with both ends of the compressor 1 through a pipeline to form a hot gas bypass pipeline, and the hot gas bypass valve 7 is a flow and pressure regulating valve of the hot gas bypass pipeline.
The compressor 1, the liquid supply valve 3 and the hot gas bypass valve 7 are respectively connected with a control device.
In this embodiment, the main circuit further comprises a dry filter 5 and a feed tube sight glass 6.
Specifically, the inlet of the compressor 1 communicates with the outlet of the evaporator 4, and the outlet of the compressor 1 communicates with the inlet of the condenser 2; the outlet of the condenser 2 is communicated with the inlet of the dry filter 5, one end of the liquid supply tube sight glass 6 is connected with the inlet of the liquid supply valve 3, and the other end of the liquid supply tube sight glass 6 is connected with the outlet of the dry filter 5; the outlet of the liquid supply valve 3 communicates with the inlet of the evaporator 4. The inlet of the hot gas bypass valve 7 is connected to the pipeline between the compressor 1 and the condenser 2, and the outlet of the hot gas bypass valve 7 is connected to the pipeline between the compressor 1 and the evaporator 4.
The air conditioning system of this embodiment, the evaporimeter can single chip design, single throttle valve control to make full use of its heat transfer area, this air conditioning system still is the best performance operation under this kind of situation, very big solution the problem that the air conditioning unit frequently opened and shut down and the problem of energy utilization.
Optionally, the air conditioning unit of the air-cooled air conditioning system is an air-cooled inter-row air conditioner of R41 OA.
On the basis of the above embodiment, in this embodiment, the air conditioning system further includes a first temperature and humidity sensor 8, a second temperature and humidity sensor 9, a pressure sensor 10, an intake air temperature sensor 11, and a rotation speed sensor. The first temperature and humidity sensor, the second temperature and humidity sensor, the pressure sensor, the air suction temperature sensor and the rotating speed sensor are respectively connected with the control device.
In this embodiment, the control device is a PLC (Programmable Controller).
The first temperature and humidity sensor 8 is arranged at the air return opening of the evaporator and used for collecting the air return temperature T1And return air humidity H1. Wherein, PLC accessible first temperature and humidity sensor data collection judge whether carry out the low-load dehumidification.
In this embodiment, the PLC may further calculate the current dew point temperature T according to the relational expression of the humid air1-S。
The second temperature and humidity sensor 9 is arranged at the air supply outlet of the evaporator and is used for collecting the air supply temperature T2And the humidity H of the air supply2. The PLC can judge the load increase or load reduction, namely frequency increase or frequency reduction, of the compressor through data collected by the second temperature and humidity sensor. In the present embodiment, the target value T is set according to the temperature of the air supply2-sWith the actual value T2The frequency of the compressor, i.e., the rotational speed, and the opening of the hot gas bypass valve can be PID-adjusted.
The above-mentioned pressure sensor 10 is arranged between the evaporator and the compressor and is used to pick up the suction pressure at the suction of the compressor. The PLC can calculate the current saturation temperature T according to the corresponding relation between the pressure and the saturation temperature of the refrigerant through the data collected by the pressure sensorSAnd further based on the saturation temperature TSAnd calculating the degree of superheat of the suction gas.
The corresponding relation between the pressure and the saturation temperature of the refrigerant in this embodiment is a disclosed relation, and is not described herein again.
The above-mentioned suction temperature sensor 11 is arranged between the evaporator and the compressor and is used to pick up the suction temperature of the compressor. Wherein, PLC calculates the superheat degree delta T of the intake air in the current operation state as T-T according to the data T of the intake air temperature sensorS. Subsequently, the process of the present invention,PID adjustment can be carried out on the opening of the liquid supply valve according to the calculated air suction superheat degree delta T, and the air suction superheat degree of 10 ℃ needs to be kept during adjustment.
The rotating speed sensor is used for collecting the rotating speed of the compressor. The PLC can judge the minimum rotating speed of the compressor according to the data (the rotating speed of the compressor) of the rotating speed sensor, namely whether the compressor is loaded down to the minimum value or not, so as to judge whether a hot gas bypass valve is opened or not, and adjust the flow and the pressure of a hot gas bypass pipeline.
As shown in fig. 4 and 5, the low-load dehumidification control method of the embodiment specifically includes the following steps:
A1. the air conditioning unit is in a preset running state; wherein the opening degree of the hot gas bypass valve is 0 in a preset operation state;
A2. judging whether the return air humidity is greater than a humidity threshold value; if so, go to A3, otherwise, go to A18.
A3. The method comprises the following steps that (1) the load of a compressor is increased, and an air conditioning unit is forcibly set to be air supply control;
A4. judging whether the return air humidity is greater than a humidity threshold value; if so, go to A5, otherwise, go to A18.
A5. And judging whether the temperature of the air supply is greater than a first temperature threshold value, if so, turning to A6, and otherwise, turning to A7.
A6. The compressor was loaded, the degree of superheat of suction gas was maintained at 10 ℃ by adjusting the opening of the liquid feed valve, and the flow was switched to a4.
A7. And judging whether the air supply temperature is less than a second temperature threshold value, if so, turning to A8, and otherwise, turning to A4.
A8. The load of the compressor is reduced, and the opening of the liquid supply valve is adjusted to keep the suction superheat degree of 10 ℃;
A9. judging whether the load of the compressor is reduced to the minimum value or not; if so, go to A10, otherwise, go to A7.
A10. Opening a hot gas bypass valve, and adjusting the opening of a liquid supply valve to keep the suction superheat degree of 10 ℃;
A11. judging whether the return air humidity is greater than a humidity threshold value; if so, go to A12, otherwise, go to A18.
A12. And judging whether the temperature of the air supply is greater than a first temperature threshold value, if so, turning to A13, and otherwise, turning to A16.
A13. And (4) judging whether the hot gas bypass valve is in an open state, if so, turning to A14, and otherwise, turning to A15.
A14. The opening degree of the hot gas bypass valve is reduced, the opening degree of the liquid supply valve is adjusted to maintain the suction superheat degree of 10 ℃, and the process is switched to A11.
A15. The compressor was loaded, the degree of superheat of suction gas was maintained at 10 ℃ by adjusting the opening of the liquid feed valve, and the flow was switched to a11.
A16. And judging whether the air supply temperature is less than a second temperature threshold value, if so, turning to A17, and otherwise, turning to A11.
A17. The opening degree of the hot gas bypass valve is increased, the opening degree of the liquid supply valve is adjusted to keep the suction superheat degree of 10 ℃, and the process is switched to A11.
A18. Low-load dehumidification is exited, and the hot gas bypass valve is guaranteed to be closed.
The air conditioning system of the embodiment is characterized in that a hot gas bypass pipeline is additionally arranged between the exhaust port of the compressor and the air suction port of the compressor, the hot gas bypass valve is configured, the load of the evaporator side can be effectively reduced, dehumidification of a machine room air conditioner under extremely low load is met, dehumidification is carried out by controlling the air supply temperature to be lower than the dew point temperature of return air, stable dehumidification under the extremely low load of a unit can be met, frequent start and stop of the air conditioning unit are avoided, and the stability of a power distribution system is remarkably improved
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims (10)

1. A low-load dehumidification control method is characterized by comprising the following steps:
connecting hot gas bypass valves at two ends of a compressor of the air conditioning unit, wherein the hot gas bypass valves are in a normally closed state;
when the air conditioning unit is in a preset operation state and the return air humidity is greater than a humidity threshold value, adjusting the load of a compressor and setting the air conditioning unit for air supply control;
selecting a mode for adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the supply air temperature is greater than a first temperature threshold, the load of the compressor is increased; if the air supply temperature is lower than a second temperature threshold value, the load of the compressor is reduced;
if the compressor is reduced to the minimum value, the hot gas bypass valve is opened, and the opening degree of the hot gas bypass valve and the load of the compressor are adjusted again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
2. The low-load dehumidification control method according to claim 1, wherein a manner of adjusting an opening of a hot gas bypass valve and a load of a compressor is adopted according to the return air humidity and the supply air temperature, and specifically comprises:
when the return air humidity is greater than the humidity threshold value, if the supply air temperature is greater than a first temperature threshold value and the hot air bypass valve is in an open state, the opening of the hot air bypass valve is reduced; if the air supply temperature is higher than the first temperature threshold value and the hot gas bypass valve is in a closed state, the load of the compressor is increased; and if the air supply temperature is lower than the second temperature threshold value, the opening degree of the hot gas bypass valve is increased.
3. The low load dehumidification control method of claim 2, further comprising, each time the hot gas bypass valve opening or the compressor load is adjusted:
and adjusting the opening degree of the liquid supply valve and keeping the preset suction superheat degree.
4. The low-load dehumidification control method of claim 1, wherein:
after the load of the compressor is increased each time, judging whether the return air humidity is greater than a humidity threshold value;
and after the load of the compressor is reduced every time, judging whether the load of the compressor is reduced to the minimum value, and judging whether the air supply temperature is smaller than a second temperature threshold value again when the load of the compressor is not reduced to the minimum value.
5. The low-load dehumidification control method according to claim 4, wherein: if the air supply temperature is not greater than the first temperature threshold and not less than the second temperature threshold, the control parameters of the air conditioning unit are kept unchanged, and the mode of adjusting the load of the compressor is selected again according to the return air humidity and the air supply temperature.
6. The low-load dehumidification control method according to claim 1, wherein the preset operation state is: the air conditioning unit is in an operating state, and the air supply temperature is greater than a third temperature threshold value;
the third temperature threshold is smaller than the first temperature threshold and larger than the second temperature threshold, and the first temperature threshold is smaller than the dew point temperature of a third temperature threshold group of the air conditioner.
7. The low-load dehumidification control method of claim 1, wherein: when the hot gas bypass valve is in an open state, if the return air humidity is not greater than the humidity threshold value, the hot gas bypass valve is closed.
8. A control apparatus for implementing the low-load dehumidification control method according to claim 1, comprising:
the low-load dehumidification mode selection module is used for adjusting the load of the compressor and setting the air conditioning unit for air supply control when the air conditioning unit is in a preset running state and the return air humidity is greater than a humidity threshold value;
the first control module is used for selecting a mode of adjusting the load of the compressor according to the return air humidity and the air supply temperature; when the return air humidity is greater than the humidity threshold, if the supply air temperature is greater than a first temperature threshold, the adjusting module is used for controlling the load increase of the compressor; if the air supply temperature is lower than the second temperature threshold value, the adjusting module is used for controlling the load reduction of the compressor;
and the second control module is used for opening the hot gas bypass valve when the load of the compressor is reduced to the minimum value, and adjusting the opening of the hot gas bypass valve and the load of the compressor again according to the return air humidity and the air supply temperature until the return air humidity is not greater than the humidity threshold value.
9. An air conditioning system, characterized in that it comprises the control device of claim 8, and further comprises an air conditioning unit comprising:
the main loop is formed by sequentially communicating a compressor, a condenser and an evaporator, and a liquid supply valve is arranged between the condenser and the evaporator;
the two ends of the hot gas bypass valve are communicated with the two ends of the compressor through pipelines;
the compressor, the liquid supply valve and the hot gas bypass valve are respectively connected with the control device.
10. The air conditioning system as claimed in claim 9, further comprising, connected to the control device, respectively:
the first temperature and humidity sensor is arranged at an air return opening of the evaporator and used for collecting the air return temperature and the air return humidity;
the second temperature and humidity sensor is arranged at the air supply outlet of the evaporator and is used for collecting the air supply temperature and the air supply humidity;
the pressure sensor is arranged between the evaporator and the compressor and used for collecting the suction pressure of the compressor;
the air suction temperature sensor is arranged between the evaporator and the compressor and used for collecting the air suction temperature of the compressor;
and the rotating speed sensor is used for acquiring the rotating speed of the compressor.
CN202110815030.8A 2021-07-19 2021-07-19 Low-load dehumidification control method and device and air conditioning system Active CN113551393B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110815030.8A CN113551393B (en) 2021-07-19 2021-07-19 Low-load dehumidification control method and device and air conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110815030.8A CN113551393B (en) 2021-07-19 2021-07-19 Low-load dehumidification control method and device and air conditioning system

Publications (2)

Publication Number Publication Date
CN113551393A CN113551393A (en) 2021-10-26
CN113551393B true CN113551393B (en) 2022-04-29

Family

ID=78132151

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110815030.8A Active CN113551393B (en) 2021-07-19 2021-07-19 Low-load dehumidification control method and device and air conditioning system

Country Status (1)

Country Link
CN (1) CN113551393B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115523642B (en) * 2022-09-19 2023-10-27 珠海格力电器股份有限公司 Control method, device and system of air conditioner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107923679A (en) * 2015-08-14 2018-04-17 三菱电机株式会社 Conditioner
CN110325023A (en) * 2019-08-14 2019-10-11 深圳云海技术有限公司 A kind of miniature data center and its low anti-condensation heat dissipating method of carrying row
CN209588247U (en) * 2018-11-19 2019-11-05 深圳市英维克科技股份有限公司 A kind of low-load runs adaptive fixed frequency air conditioner system
JP2020012599A (en) * 2018-07-19 2020-01-23 株式会社コロナ Heat pump-type cold water cooling device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11710845B2 (en) * 2017-11-27 2023-07-25 University Of Maryland, College Park Systems, devices, and methods employing electrochemical processing with oxygen as carrier gas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107923679A (en) * 2015-08-14 2018-04-17 三菱电机株式会社 Conditioner
JP2020012599A (en) * 2018-07-19 2020-01-23 株式会社コロナ Heat pump-type cold water cooling device
CN209588247U (en) * 2018-11-19 2019-11-05 深圳市英维克科技股份有限公司 A kind of low-load runs adaptive fixed frequency air conditioner system
CN110325023A (en) * 2019-08-14 2019-10-11 深圳云海技术有限公司 A kind of miniature data center and its low anti-condensation heat dissipating method of carrying row

Also Published As

Publication number Publication date
CN113551393A (en) 2021-10-26

Similar Documents

Publication Publication Date Title
CN101109592B (en) Temperature emergent state controlling means for air conditioner compressor air suction port
CN104653444B (en) Method and device for controlling starting of variable-frequency air conditioner
CN101813343A (en) High-precision constant-temperature and humidity air conditioner operated in wide temperature range
CN110207420B (en) Multi-split system and control method thereof
CN108105919B (en) Variable frequency air conditioner system for dry working condition refrigeration and control method thereof
CN111351151B (en) Variable air volume fresh air dehumidification system for underground engineering and control method thereof
CN107906640A (en) A kind of integrated chilling air conditioning system and its control method for data center
CN113551393B (en) Low-load dehumidification control method and device and air conditioning system
CN201163119Y (en) Energy-saving air conditioner
CN108105965B (en) Air conditioning system for controlling air outlet humidity and control method thereof
CN110195920A (en) A kind of heat-exchange system and its control method and air conditioner
CN201373632Y (en) Multi-connected air-conditioning system
CN102297494A (en) Method for refrigeration and stably operation at low load of vacuum reducer valve and system thereof
CN110986198A (en) VRV air conditioning system suitable for equipment room
CN114811860A (en) Multi-split air conditioning system control method and multi-split air conditioning system
CN207471687U (en) Air-conditioning system and the air conditioner with the air-conditioning system
CN201611144U (en) High-precision constant temperature/humidity air conditioner capable of operating in wide temperature range
CN115978751A (en) Frequency conversion direct expansion machine
CN212299533U (en) Heat exchange system and air conditioner
CN209588247U (en) A kind of low-load runs adaptive fixed frequency air conditioner system
CN114370727A (en) Compressor control method and device and air conditioner
CN207395061U (en) A kind of data center's air-conditioning system
EP1508752A1 (en) Thermohygrostat-type air conditioner with means for controlling evaporation temperature
CN220601671U (en) Water-cooling integrated water chilling unit with natural cooling function
CN114508808B (en) Magnetic suspension variable frequency water chilling unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant