CN110953684B - Control method of air conditioner cooling system and air conditioner - Google Patents

Control method of air conditioner cooling system and air conditioner Download PDF

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Publication number
CN110953684B
CN110953684B CN201911330621.5A CN201911330621A CN110953684B CN 110953684 B CN110953684 B CN 110953684B CN 201911330621 A CN201911330621 A CN 201911330621A CN 110953684 B CN110953684 B CN 110953684B
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China
Prior art keywords
cooling
temperature
cooling tower
frequency
cooling system
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CN201911330621.5A
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Chinese (zh)
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CN110953684A (en
Inventor
刘华
刘国林
何玉雪
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control 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
    • F24F11/85Control 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 variable-flow pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature

Abstract

The invention discloses a control method of an air conditioner cooling system and an air conditioner, comprising the following steps: acquiring a difference value of heat exchange temperatures of cooling towers in a cooling system, and calculating the difference value and a preset difference value to obtain a deviation value; calculating the deviation value through an increment algorithm to obtain the frequency increment of a cooling pump of the cooling tower; controlling the frequency of the cooling pump according to the frequency increment. The invention can increase the frequency of the cooling pump when the heat exchange efficiency of the cooling tower is low or the heat exchange efficiency of the condenser is reduced by increasing the relation between the frequency of the cooling pump and the heat exchange efficiency of the cooling tower or the heat exchange efficiency of the condenser, so that the frequency of the cooling pump is determined by the temperature difference of the cooling water, and the energy saving performance and the reliability of the control operation of the cooling water system of the central air conditioner are improved.

Description

Control method of air conditioner cooling system and air conditioner
Technical Field
The invention relates to the field of air conditioners, in particular to a control method of an air conditioner cooling system and an air conditioner.
Background
With the increasingly prominent energy problem in China, energy conservation and consumption reduction are imperative. The frequency conversion control technology of the central air conditioner is a key technology in the energy-saving control technology of the central air conditioner, the frequency conversion control technology of a cooling pump and a cooling tower fan is of great importance in the energy-saving control technology of the central air conditioner, and a control method is provided according to the actual experience of engineering.
The traditional cooling pump frequency conversion control adopts constant temperature difference control, the control target is the cooling water inlet and outlet temperature difference, certain limitation exists in the actual engineering by the control mode, when the heat exchange efficiency of the condenser is reduced (due to reasons such as incrustation scale, namely the condenser is not cleaned timely and the like, the temperature difference of the small end of the condenser of the refrigerator is enlarged), or when the heat exchange efficiency of the cooling tower is reduced (due to reasons such as the cooling tower is not cleaned timely and the like, the approach degree of the condenser is enlarged), the temperature difference of the inlet and outlet water of the condenser is reduced, the frequency of the cooling pump is reduced under the control of a group control system, and the condensation temperature of the refrigerator is improved.
Disclosure of Invention
The invention provides a control method of an air conditioner cooling system and an air conditioner, aiming at solving the technical problem that the frequency of a cooling pump is not matched with the actual heat exchange condition in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a control method of an air conditioner cooling system, which comprises the following steps:
acquiring a difference value of heat exchange temperatures of cooling towers in a cooling system, and calculating the difference value and a preset difference value to obtain a deviation value;
calculating the deviation value through an increment algorithm to obtain the frequency increment of a cooling pump of the cooling tower;
controlling the frequency of the cooling pump according to the frequency increment.
Preferably, the incremental algorithm is a PID incremental algorithm.
Further, the difference of the heat exchange temperature is the difference of the condensation temperature and the air inlet temperature of the cooling tower.
The invention also comprises the following steps: and calculating a second deviation value of the condensation temperature and the preset condensation temperature, and controlling the frequency of the cooling tower fan according to a preset frequency value of the cooling tower fan corresponding to the preset range in which the second deviation value is located.
Further, the larger the second deviation value is, the higher the preset frequency value corresponding to the second deviation value is.
The invention also comprises the following steps: and judging whether the difference value between the condensation temperature and the water inlet temperature of the cooling tower is greater than a limit value, and if so, sending an early warning notice for prompting a user to clean the condenser.
The invention also comprises the following steps: and judging whether the difference value between the water outlet temperature of the cooling tower and the air inlet temperature of the cooling tower is greater than a second limit value or not, and if so, sending an early warning notice for prompting a user to clean the cooling tower.
Furthermore, the air inlet temperature of the cooling tower is the air inlet wet bulb temperature of the cooling tower.
Preferably, the condensation temperature is obtained by:
detecting the condensing pressure;
and inquiring a relation table of refrigerant saturation pressure and saturation temperature to find the condensation temperature corresponding to the condensation pressure.
The invention also provides an air conditioner which comprises a cooling system, wherein the cooling system is controlled according to the control method.
Preferably, the cooling system includes: the air conditioner is a water chilling unit.
Compared with the prior art, the invention can increase the frequency of the cooling pump when the heat exchange efficiency of the cooling tower is low or the heat exchange efficiency of the condenser is reduced by increasing the relation between the frequency of the cooling pump and the heat exchange efficiency of the cooling tower or the heat exchange efficiency of the condenser, so that the frequency of the cooling pump is determined by the temperature difference of the cooling water, and the energy saving performance and the reliability of the control operation of the central air-conditioning cooling water system are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of the present invention;
fig. 2 is a control schematic diagram of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in 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.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and fig. 2, the present invention provides a control method for an air-conditioning cooling system, including the steps of: acquiring a difference value of heat exchange temperatures of cooling towers in a cooling system, and subtracting a preset difference value from the difference value to obtain a deviation value; calculating the deviation value through an increment algorithm to obtain the frequency increment of a cooling pump of the cooling tower; controlling the frequency of the cooling pump according to the frequency increment. The invention changes the temperature difference of the water inlet and the water outlet of the original condenser into the difference of the heat exchange temperature of the cooling tower, can prevent the frequency of the cooling pump from being reduced when the heat exchange efficiency of the cooling tower is low or the heat exchange efficiency of the condenser is reduced, and improves the energy-saving property and the reliability of the control operation of the cooling water system of the central air conditioner.
In the invention, the difference of the heat exchange temperature is the difference of the condensation temperature and the air inlet temperature of the cooling tower, the condensation temperature is the condensation temperature of the condenser, and the air inlet temperature of the cooling tower is the wet bulb temperature of a temperature sensor arranged at the air inlet of the cooling tower, namely the air inlet wet bulb temperature of the cooling tower.
The condensation temperature can be obtained in various ways, and the method specifically comprises the following steps: detecting the condensation pressure, and obtaining the condensation pressure through a communication protocol of a cold water unit; and inquiring a relation table (or relation calculation) between the saturation pressure and the saturation temperature of the refrigerant to find the condensation temperature corresponding to the condensation pressure.
In a specific embodiment, the increment algorithm is a PID increment algorithm, and the specific formula thereof is:
and delta u n is the frequency increment, e n is the deviation value of the current moment, e n-1 is the deviation value of the previous moment, e n-2 is the deviation value of e n-1, and Kp, Ki and Kd are preset values in the controller, so that the frequency increment of the cooling pump can be continuously obtained to correct the cooling pump.
The invention also provides the concrete steps of adjusting the fan frequency of the cooling tower: and calculating a difference value between the condensation temperature and the preset condensation temperature to obtain a second deviation value, and controlling the frequency of the cooling tower fan according to a preset frequency value of the cooling tower fan corresponding to the preset range in which the second deviation value is located. The preset range is multiple, each preset range corresponds to a preset frequency value, the fan is divided into a plurality of gears according to the preset frequency value, the larger the second deviation value is, the higher the corresponding preset frequency value is, the larger the wind power of the fan is, and the cooling effect of the cooling tower is changed.
The invention also comprises the following steps: and judging whether the difference value between the condensation temperature and the inlet water temperature of the cooling tower (namely the temperature difference of the small end of the condenser) is larger than a limit value, if so, indicating that the condenser needs to be cleaned, and sending an early warning notice for prompting a user to clean the condenser.
The invention also comprises the following steps: and judging whether the difference value between the outlet water temperature of the cooling tower and the inlet air temperature of the cooling tower (namely the approximation degree of the cooling tower) is greater than a second limit value, if so, indicating that the cooling tower needs to be cleaned, and sending out an early warning notice for prompting a user to clean the cooling tower.
The invention also provides an air conditioner which comprises a cooling system, wherein the cooling system is controlled according to the control method. In a specific embodiment, the air conditioner is a chiller.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A control method of an air conditioner cooling system is characterized by comprising the following steps:
acquiring a difference value of heat exchange temperatures of cooling towers in a cooling system, and calculating the difference value and a preset difference value to obtain a deviation value; the difference of the heat exchange temperatures is the difference of the condensation temperature and the air inlet temperature of the cooling tower;
calculating the deviation value through a PID (proportion integration differentiation) increment algorithm to obtain the frequency increment of a cooling pump of the cooling tower;
controlling the frequency of the cooling pump according to the frequency increment.
2. The control method of the air conditioning cooling system as claimed in claim 1, further comprising the steps of: and calculating a second deviation value of the condensation temperature and the preset condensation temperature, and controlling the frequency of the cooling tower fan according to a preset frequency value of the cooling tower fan corresponding to the preset range in which the second deviation value is located.
3. The control method of an air conditioning cooling system as set forth in claim 2, wherein said second deviation value is larger and corresponds to a higher predetermined frequency value.
4. The control method of the air conditioning cooling system as claimed in claim 1, further comprising the steps of: and judging whether the difference value between the condensation temperature and the water inlet temperature of the cooling tower is greater than a limit value, and if so, sending an early warning notice for prompting a user to clean the condenser.
5. The control method of the air conditioning cooling system as claimed in claim 1, further comprising the steps of: and judging whether the difference value between the water outlet temperature of the cooling tower and the air inlet temperature of the cooling tower is greater than a second limit value or not, and if so, sending an early warning notice for prompting a user to clean the cooling tower.
6. The method as claimed in claim 1, wherein the cooling tower inlet air temperature is cooling tower inlet air wet bulb temperature.
7. The control method of an air conditioning cooling system as set forth in claim 1, wherein said condensing temperature is obtained by:
detecting the condensing pressure;
and inquiring a relation table of refrigerant saturation pressure and saturation temperature to find the condensation temperature corresponding to the condensation pressure.
8. An air conditioner comprising a cooling system, characterized in that the cooling system is controlled according to the control method of any one of claims 1 to 7.
9. The air conditioner of claim 8, the cooling system comprising: the air conditioner is a water chilling unit.
CN201911330621.5A 2019-12-20 2019-12-20 Control method of air conditioner cooling system and air conditioner Active CN110953684B (en)

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CN112413809B (en) * 2020-11-25 2021-11-30 珠海格力电器股份有限公司 Method, device and system for evaluating operation of cold station of central air conditioner
CN113915719A (en) * 2021-04-29 2022-01-11 高格立节能科技(海南)有限公司 Real-time frequency conversion control method and controller for central air-conditioning water pump

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JP2768501B2 (en) * 1989-06-26 1998-06-25 三井化学株式会社 Cooling tower temperature control
CN104089362B (en) * 2014-06-03 2016-09-28 杭州哲达科技股份有限公司 A kind of central air conditioning cooling water system cooling effectiveness maximization method and control device
CN105043129B (en) * 2015-06-24 2017-12-12 山东新力拓节能服务工程科技有限公司 Whether a kind of automatic decision cooling tower needs the method safeguarded
CN107806695B (en) * 2016-08-29 2019-12-10 广东迪奥技术有限公司 Energy-saving control device and method for air conditioner cooling water system
CN106524410B (en) * 2016-11-07 2019-06-18 深圳市奥宇节能技术股份有限公司 A kind of diagnostic method of central air-conditioning water cooler actual efficiency

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