CN108800461B - Energy control method and device of air conditioning unit - Google Patents
Energy control method and device of air conditioning unit Download PDFInfo
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- CN108800461B CN108800461B CN201810437658.7A CN201810437658A CN108800461B CN 108800461 B CN108800461 B CN 108800461B CN 201810437658 A CN201810437658 A CN 201810437658A CN 108800461 B CN108800461 B CN 108800461B
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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
- F24F11/62—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
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
- F24F11/47—Responding to energy costs
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention belongs to the technical field of air conditioners, in particular to an energy control method and an energy control device for an air conditioning unit, aiming at solving the problems of large energy consumption and energy waste when the air conditioning unit works, and the energy control method comprises the following steps: acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit; calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature; comparing the current energy with the required energy and comparing the target outlet water temperature with the actual outlet water temperature; and controlling the energy state of the air conditioning unit based on the comparison result. The energy control mode can reduce energy waste and energy consumption of the air conditioning unit. Meanwhile, the energy control device of the air conditioning unit can execute and realize the method.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an energy control method and device of an air conditioning unit.
Background
The air conditioning unit mainly comprises an air cooling mode and a water cooling mode, and the air conditioning unit adopting the water cooling mode has the advantages of stable performance, high efficiency ratio, low noise and the like, and is widely applied to the field of air conditioners.
At present, the air conditioning unit adopting a water cooling mode mainly has two modes for adjusting energy: one is to simply perform PID adjustment according to the actual outlet water temperature and the target outlet water temperature, and as long as the actual outlet water temperature does not reach the target outlet water temperature, the compressor can be continuously loaded and the maximum 100% energy operation can be kept even if the actual outlet water temperature is different from the target outlet water temperature, so that great energy waste can be caused; the other method is to calculate the required energy through the difference between the actual outlet water temperature and the target outlet water temperature so as to load or unload the compressor, which can solve the waste of partial energy, but because the compressor is regulated in sections, the energy state is only four steps of 25%, 50%, 75% and 100%, the required energy is a continuous value between 0% and 100%, and there is a large difference between the actual energy and the required energy, which also causes energy waste, for example: when the demand energy is 55%, the compressor may be shifted to 75% of the actual energy, wasting 15% of the energy.
Accordingly, there is a need in the art for a new energy control method to address the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems of large energy consumption and energy waste when the air conditioning unit works, in one aspect of the present invention, an energy control method for an air conditioning unit is provided, which includes the following steps:
acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit;
calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature;
comparing the current energy with the required energy and comparing the target outlet water temperature with the actual outlet water temperature;
controlling an energy state of the air conditioning unit based on the comparison result;
wherein the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which needs to be reached by a compressor of the air conditioning unit at present.
Preferably, the step of "controlling the energy state of the air conditioning unit based on the comparison result" includes:
if the difference value obtained by subtracting the current energy from the required energy is larger than a first energy threshold value, and the actual water outlet temperature is larger than the target water outlet temperature, controlling a compressor of the air conditioning unit to load;
if the difference value of the current energy minus the required energy is larger than a second energy threshold value, and the difference value of the actual outlet water temperature minus the target outlet water temperature is smaller than a set temperature threshold value, controlling the compressor of the air conditioning unit to carry out load shedding;
otherwise, keeping the current energy value of the compressor of the air conditioning unit.
Preferably, the step of calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature specifically includes:
and calculating the required energy of the air conditioning unit through PID operation according to the target outlet water temperature and the actual outlet water temperature.
Preferably, the current energy is expressed as a percentage of a current energy absolute value to a highest energy absolute value, and is divided into four grades of 25%, 50%, 75% and 100% according to a capacity regulating valve opening degree of a compressor of the air conditioning unit.
Preferably, the required energy is expressed as a percentage of the absolute value of the required energy to the absolute value of the highest energy, and is a continuous value, and the value ranges from 0% to 100%.
Preferably, the first and second energy thresholds are expressed as a percentage of the absolute value of the first and second energy thresholds, respectively, to the highest absolute value of energy;
the first energy threshold value is any value between 0% and 25%;
the second energy threshold is any value between 0% and 25%.
Preferably, the first energy threshold and the second energy threshold are both 15%, and the temperature threshold is 8 ℃; and/or
The air conditioning unit is a water-cooling screw unit.
In another aspect of the present invention, an energy control device of an air conditioning unit is further provided, where the energy control device includes:
the data acquisition module is used for acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit;
the energy calculation module is used for calculating the required energy of the air conditioning unit based on the target outlet water temperature and the actual outlet water temperature;
the energy control module is used for comparing the current energy with the required energy, comparing the target outlet water temperature with the actual outlet water temperature and controlling the energy state of the air conditioning unit based on the comparison result;
wherein the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which needs to be reached currently by a compressor of the air conditioning unit.
Preferably, the energy control module controls the energy state of the air conditioning unit by:
if the difference value obtained by subtracting the current energy from the required energy is larger than a first energy threshold value, and the actual water outlet temperature is larger than the target water outlet temperature, controlling a compressor of the air conditioning unit to load;
if the difference value of the current energy minus the required energy is larger than a second energy threshold value, and the difference value of the actual outlet water temperature minus the target outlet water temperature is smaller than a set temperature threshold value, controlling the compressor of the air conditioning unit to carry out load shedding;
otherwise, keeping the current energy value of the compressor of the air conditioning unit.
Preferably, the energy calculation module is a PID operator.
The invention has the beneficial effects that: the invention achieves the purposes of reducing energy waste and reducing energy consumption by adding energy buffering and temperature condition constraint on energy regulation. The loading command is sent when the difference value obtained by subtracting the actual energy from the required energy is greater than the set energy threshold value and the actual water outlet temperature is greater than the target water outlet temperature, so that the action that the required energy is shifted once the required energy exceeds the opening of the capacity regulating valve of the compressor is eliminated, the required energy and the actual energy can be smoothly and stably transited, and the waste of the energy of the compressor is reduced; and when the actual energy minus the required energy is larger than the set energy threshold and the difference obtained by subtracting the target outlet water temperature from the actual outlet water temperature is smaller than the temperature threshold, a load shedding command is sent, so that the compressor adjusts the energy of the compressor in advance under the condition that the actual energy meets the required energy, the unit runs at low energy, and the energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of an energy control method of a water-cooled screw unit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an energy control device of an air conditioning unit according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The energy control method of the air conditioning unit comprises the following steps:
step S101: acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit;
step S102: calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature;
step S103: comparing the current energy with the required energy and comparing the target outlet water temperature with the actual outlet water temperature;
step S104: controlling the energy state of the air conditioning unit based on the comparison result;
the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which needs to be reached by a compressor of the air conditioning unit at present.
Specifically, in step S101, the current energy of the air conditioning unit is expressed as a percentage of the absolute value of the current energy to the absolute value of the highest energy, and the current energy is divided into four gears, i.e., 25%, 50%, 75% and 100%, according to the opening of the capacity regulating valve of the compressor of the air conditioning unit.
Specifically, in step S102, the required energy of the air conditioning unit is expressed as a percentage of the absolute value of the required energy to the absolute value of the highest energy, and is a continuous value, and the value range is 0% to 100%. The required energy of the air conditioning unit is calculated through PID operation according to the target water outlet temperature and the actual water outlet temperature.
Specifically, the steps S103 and S104 are mainly for adding energy buffer and temperature condition constraint in the air conditioning unit energy control process to achieve the purposes of reducing energy consumption and reducing energy waste. The preferred embodiment is as follows: if the difference value obtained by subtracting the current energy from the required energy is larger than the first energy threshold value and the actual water outlet temperature is larger than the target water outlet temperature, the loading of the compressor of the air conditioning unit is controlled, so that the action that the required energy is shifted once exceeding the opening of the capacity regulating valve of the compressor is eliminated, the required energy and the current energy are in smooth and stable transition, the waste of the energy of the compressor is reduced, and the energy of the compressor is fully used. And if the difference obtained by subtracting the required energy from the current energy is larger than a second energy threshold value and the difference obtained by subtracting the target outlet water temperature from the actual outlet water temperature is smaller than a set temperature threshold value, the load of the compressor of the air conditioning unit is reduced, so that the energy of the compressor is adjusted in advance under the condition that the current energy meets the required energy, the air conditioning unit is enabled to run at low energy, and the energy consumption is reduced. Otherwise, the compressor of the air conditioning unit is kept at the current energy value.
Specifically, in a preferred embodiment of the present invention, the set first energy threshold and the second energy threshold are expressed as a percentage of the absolute value of the first energy threshold and the second energy threshold, respectively, to the highest absolute value of energy, and the first energy threshold is any value between 0% and 25%; the second energy threshold is any value between 0% and 25%. More specifically, the first energy threshold and the second energy threshold are both set to 15%, and the set temperature threshold is 8 ℃.
It should be noted that the air conditioning unit of the present invention may also be a water-cooled screw unit.
Referring to fig. 1, fig. 1 is a schematic diagram of an energy control method of a water-cooling screw unit according to an embodiment of the present invention, as shown in fig. 1, the energy control method of the water-cooling screw unit according to the embodiment includes the following steps:
step S201: acquiring the actual energy (namely the current energy), the target water outlet temperature and the actual water outlet temperature of the water-cooled screw unit;
step S202: calculating the required energy of the current water-cooling screw unit through PID operation according to the actual water outlet temperature and the target water outlet temperature;
step S203: if the difference obtained by subtracting the current energy from the required energy is larger than 15% and the actual water outlet temperature is larger than the target water outlet temperature, loading a compressor of the water-cooled screw unit; if the difference obtained by subtracting the required energy from the current energy is more than 15 percent and the difference obtained by subtracting the target outlet water temperature from the actual outlet water temperature is less than 8 ℃, reducing the load of a compressor of the water-cooled screw unit; otherwise, the compressor of the water-cooled screw unit maintains the current energy value.
The embodiment of the invention also provides an energy control device of the air conditioning unit. Referring to fig. 2, fig. 2 is a schematic diagram of an energy control device of an air conditioning unit according to an embodiment of the present invention, as shown in fig. 2, the energy control device includes:
the data acquisition module 11 is used for acquiring the current energy, the target outlet water temperature and the actual outlet water temperature of the air conditioning unit;
an energy calculation module 12 which calculates the required energy of the air conditioning unit based on the target outlet water temperature and the actual outlet water temperature; specifically, the energy calculating module 12 used in this embodiment is a PID operator;
the energy control module 13 is used for comparing the current energy with the required energy, comparing the target outlet water temperature with the actual outlet water temperature and controlling the energy state of the air conditioning unit based on the comparison result;
the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which is required to be reached by a compressor of the air conditioning unit at present.
It will be understood by those skilled in the art that the physical forms of the data acquisition module, the energy calculation module and the energy control module may be independent from each other, or may be functional units integrated into one physical module, such as the energy control device including a memory and a processor, and a calculation program stored in the memory and executable on the processor, and the calculation program may perform the functions of the data acquisition module, the energy calculation module and the energy control module.
Specifically, in the embodiment, the energy control module 13 controls the energy state of the air conditioning unit in the following manner:
if the difference value of the current energy subtracted from the required energy is larger than a first energy threshold value, and the actual water outlet temperature is larger than the target water outlet temperature, controlling the compressor of the air conditioning unit to load;
if the difference value of the current energy minus the required energy is larger than a second energy threshold value, and the difference value of the actual water outlet temperature minus the target water outlet temperature is smaller than a set temperature threshold value, controlling the compressor of the air conditioning unit to reduce the load;
otherwise, the compressor of the air conditioning unit is kept at the current energy value.
Those of skill in the art will appreciate that the various illustrative methods and apparatus described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of electronic hardware and software. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. An energy control method of an air conditioning unit is characterized by comprising the following steps:
acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit;
calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature;
comparing the current energy with the required energy and comparing the target outlet water temperature with the actual outlet water temperature;
controlling an energy state of the air conditioning unit based on the comparison result;
wherein the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which needs to be reached by a compressor of the air conditioning unit currently;
the step of controlling the energy state of the air conditioning unit based on the comparison result specifically includes:
if the difference value obtained by subtracting the current energy from the required energy is larger than a first energy threshold value, and the actual water outlet temperature is larger than the target water outlet temperature, controlling a compressor of the air conditioning unit to load;
if the difference value of the current energy minus the required energy is larger than a second energy threshold value, and the difference value of the actual outlet water temperature minus the target outlet water temperature is smaller than a set temperature threshold value, controlling the compressor of the air conditioning unit to carry out load shedding;
otherwise, keeping the current energy value of the compressor of the air conditioning unit.
2. The energy control method of the air conditioning unit according to claim 1, wherein the step of calculating the required energy of the air conditioning unit according to the target outlet water temperature and the actual outlet water temperature specifically comprises:
and calculating the required energy of the air conditioning unit through PID operation according to the target outlet water temperature and the actual outlet water temperature.
3. The energy control method of the air conditioning unit according to claim 1, wherein the current energy is expressed as a percentage of a current energy absolute value to a highest energy absolute value, and is divided into four steps of 25%, 50%, 75% and 100% according to a capacity regulating valve opening degree of a compressor of the air conditioning unit.
4. The energy control method of the air conditioning unit according to claim 1, wherein the required energy is expressed as a percentage of an absolute value of the required energy to an absolute value of the highest energy, and is a continuous value, and the value ranges from 0% to 100%.
5. The energy control method of an air conditioning assembly according to claim 1, characterized in that said first and second energy thresholds are expressed as percentages of the absolute values of said first and second energy thresholds, respectively, to the highest absolute value of energy;
the first energy threshold value is any value between 0% and 25%;
the second energy threshold is any value between 0% and 25%.
6. The energy control method of the air conditioning unit according to claim 5, wherein the first energy threshold and the second energy threshold are both 15%, and the temperature threshold is 8 ℃; and/or
The air conditioning unit is a water-cooling screw unit.
7. An energy control device of an air conditioning unit, characterized in that the energy control device comprises:
the data acquisition module is used for acquiring the current energy, the target water outlet temperature and the actual water outlet temperature of the air conditioning unit;
the energy calculation module is used for calculating the required energy of the air conditioning unit based on the target outlet water temperature and the actual outlet water temperature;
the energy control module is used for comparing the current energy with the required energy, comparing the target outlet water temperature with the actual outlet water temperature and controlling the energy state of the air conditioning unit based on the comparison result;
wherein the current energy is the current energy value of a compressor of the air conditioning unit;
the required energy is an energy value which needs to be reached currently by a compressor of the air conditioning unit;
the energy control module controls the energy state of the air conditioning unit specifically through the following modes:
if the difference value obtained by subtracting the current energy from the required energy is larger than a first energy threshold value, and the actual water outlet temperature is larger than the target water outlet temperature, controlling a compressor of the air conditioning unit to load;
if the difference value of the current energy minus the required energy is larger than a second energy threshold value, and the difference value of the actual outlet water temperature minus the target outlet water temperature is smaller than a set temperature threshold value, controlling the compressor of the air conditioning unit to carry out load shedding;
otherwise, keeping the current energy value of the compressor of the air conditioning unit.
8. The energy control device of an air conditioning unit according to claim 7, wherein the energy calculation module is a PID operator.
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| CN201810437658.7A CN108800461B (en) | 2018-05-09 | 2018-05-09 | Energy control method and device of air conditioning unit |
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| CN201810437658.7A CN108800461B (en) | 2018-05-09 | 2018-05-09 | Energy control method and device of air conditioning unit |
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| CN109812949B (en) * | 2019-02-22 | 2021-05-04 | 广东欧科空调制冷有限公司 | Load control method and device of multi-compressor unit and air conditioner |
| CN109812950B (en) * | 2019-02-22 | 2021-04-09 | 广东欧科空调制冷有限公司 | Air conditioner evaporation temperature control method and device and air conditioner |
| CN110567124B (en) * | 2019-09-19 | 2021-04-13 | 南京天加环境科技有限公司 | Energy adjusting method of modular water machine |
| CN112880115B (en) * | 2019-11-29 | 2022-05-20 | 青岛海尔空调电子有限公司 | Control method of multi-unit air conditioning system |
| CN111412624A (en) * | 2020-03-20 | 2020-07-14 | 青岛海尔空调电子有限公司 | Air conditioning unit and compressor frequency control method thereof |
| CN113108393B (en) * | 2021-05-31 | 2022-04-12 | 南通华信中央空调有限公司 | Energy adjusting method for air-conditioning water system |
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Effective date of registration: 20201102 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER ELECTRIC Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER ELECTRIC Co.,Ltd. |