CN110553352B - Enthalpy increasing control method and system for air conditioning unit - Google Patents
Enthalpy increasing control method and system for air conditioning unit Download PDFInfo
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- CN110553352B CN110553352B CN201910866282.6A CN201910866282A CN110553352B CN 110553352 B CN110553352 B CN 110553352B CN 201910866282 A CN201910866282 A CN 201910866282A CN 110553352 B CN110553352 B CN 110553352B
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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
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
-
- 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
- F24F2110/10—Temperature
Abstract
The invention discloses an enthalpy-increasing control method and system for an air conditioning unit, wherein the method comprises the following steps: calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time; and comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result. By adopting the technical scheme of the invention, the operation efficiency of the air conditioning unit can be improved, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an enthalpy increasing control method and an enthalpy increasing control system for an air conditioning unit.
Background
In a common household air conditioner, the heating in winter is reduced along with the reduction of the temperature of the outdoor environment, the heating load of the air conditioner is obviously reduced, the compression ratio of an air conditioner compressor is increased under the ultralow temperature, the exhaust temperature is continuously increased, the long-term operation forms potential safety hazards to a unit, the comfort of a user is poor in the use process under the low-temperature environment in winter, the air supply and enthalpy increase technology can greatly improve the operation condition under the low-temperature environment, and the control of the air supply and enthalpy increase technology plays a key role in the control.
The air conditioning unit in the prior art has the technical problems of complicated enthalpy-increasing control logic, low efficiency and high energy consumption.
Disclosure of Invention
The invention aims to provide an enthalpy-increasing control method and an enthalpy-increasing control system for an air conditioning unit, which have simple and efficient control logic and aim to solve the technical problems in the prior art.
The embodiment of the invention provides an enthalpy-increasing control method of an air conditioning unit, which comprises the following steps:
calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time;
and comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
In the embodiment of the present invention, controlling the air conditioning unit to open the enthalpy increasing mode or close the enthalpy increasing mode according to the comparison result includes:
when the unit is in stable operation,
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
In the embodiment of the present invention, controlling the air conditioning unit to open the enthalpy increasing mode or close the enthalpy increasing mode according to the comparison result further includes:
when the air conditioning unit is initially turned on,
and if the sigma Qa > sigma Qn, controlling the unit to start the enthalpy increasing mode.
In the embodiment of the invention, the calculation mode of the summation sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period is as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity, A value, of the nth internal unitIs a percentage number, and
，
[E] the temperature deviation value between the indoor environment temperature value and the set temperature at the beginning of the current period is Qr, the rated capacity of the indoor unit is Kp, the set proportionality constant is Ki, the integral constant is Ki, Ek is the detection value of the temperature deviation value [ E ] in every other sampling period in a control period T, dt is the sampling period, and D is a correction coefficient.
In the embodiment of the invention, when the internal machine operates in a refrigeration mode or an air supply mode, the correction coefficient D = 0;
when the internal machine operates in the heating mode, the correction coefficient D = 1.
In an embodiment of the present invention, an enthalpy increasing control system for an air conditioning unit is further provided, including:
the calculation module is used for calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time;
and the control module is used for comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
In the embodiment of the invention, when the unit operates stably, the control module controls the air conditioning unit to open the enthalpy increasing mode or close the enthalpy increasing mode according to the comparison result as follows:
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
In the embodiment of the invention, when the air conditioning unit is initially started, the control module controls the manner of starting the enthalpy-increasing compressor or closing the enthalpy-increasing compressor according to the comparison result as follows:
and if the sigma Qa >. sigma Qn, the control module controls the unit to start the enthalpy increasing mode.
In the embodiment of the present invention, the calculation module calculates the sum Σ Qa of the heating capacity requirements of each internal unit in the air conditioning unit in the current period as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity of the nth internal machine, and the value A is a percentage number
，
[E] The temperature deviation value between the indoor environment temperature value and the set temperature at the beginning of the current period is Qr, the rated capacity of the indoor unit is Kp, the set proportionality constant is Ki, the integral constant is Ki, Ek is the detection value of the temperature deviation value [ E ] in every other sampling period in a control period T, dt is the sampling period, and D is a correction coefficient.
In the embodiment of the invention, when the internal machine operates in a refrigeration mode or an air supply mode, the correction coefficient D = 0;
when the internal machine operates in the heating mode, the correction coefficient D = 1.
Compared with the prior art, in the enthalpy-increasing control method and the enthalpy-increasing control system of the air conditioning unit, when the enthalpy-increasing control is carried out on the air conditioning unit, the sum sigma Qa of the heating capacity requirements of each indoor unit in the air conditioning unit in a set period is calculated in real time, the sum sigma Qa of the heating capacity requirements of each indoor unit in the air conditioning unit in the current period is compared with the set start enthalpy-increasing condition value sigma Qm and the close enthalpy-increasing condition value sigma Qn, the air conditioning unit is controlled to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result, the enthalpy-increasing control logic is simple, the operation efficiency of the air conditioning unit can be improved, and the energy consumption is reduced.
Drawings
Fig. 1 is a schematic flow chart of an enthalpy-increasing control method for an air conditioning unit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an enthalpy-increasing control system of an air conditioning unit according to an embodiment of the present invention.
Detailed Description
The invention provides an enthalpy-increasing control method and system for an air conditioning unit, wherein the method comprises the following steps: calculating the sum of the heating capacity requirements of each internal unit in the air conditioning unit in a set period in real time; and comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value and close enthalpy-increasing condition value, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
As shown in fig. 1, the enthalpy increasing control method for an air conditioning unit according to an embodiment of the present invention includes steps S1-S2. The following are separately described
Step S1: and calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time.
It should be noted that, when the air conditioning unit is operating and enthalpy-increasing control is performed, a standard for turning on the enthalpy-increasing mode or turning off the enthalpy-increasing mode needs to be set. In the embodiment of the invention, the sum sigma Qa of the heating capacity requirements of each indoor unit in the air conditioning unit is used as a judgment basis for starting the enthalpy-increasing mode or closing the enthalpy-increasing mode. The calculation mode of the summation sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period is as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity of the nth internal machine, and the value A is a percentage number
，
Wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nThe rated heating capacity of the nth internal machine is shown, n is a natural number,
a is a percentage coefficient, and
，
wherein [ E ] is a temperature deviation value between an indoor environment temperature value and a set temperature at the beginning of a current period, Qr is the rated capacity of the indoor unit, Kp is a set proportionality constant, Ki is a set integral constant, Ek is a detection value of the temperature deviation value [ E ] every other sampling period in a control period T, dt is a sampling period, and D is a correction coefficient. When the internal machine operates in a cooling mode or an air supply mode, the correction coefficient D = 0; when the internal machine operates in the heating mode, the correction coefficient D = 1. That is, when the indoor unit operates in the cooling mode or the air supply mode, the heating capacity requirement of the indoor unit is zero, and only when the indoor unit operates in the heating mode, the heating capacity requirement of the indoor unit exists.
It should be noted that, in the embodiment of the present invention, since the sum Σ Qa of the heating capacity requirements of each internal unit in the air conditioning unit needs to be dynamically calculated, a calculation period needs to be set, and the heating capacity requirement of each internal unit in each period needs to be calculated at the beginning of each period. In the calculation formula, a percentage coefficient A of the heating capacity requirement of each indoor unit and the rated heating capacity of the indoor unit is calculated by adopting a PI regulation function in each period, so that the real-time heating capacity requirement of the whole air conditioning unit can be accurately obtained.
Step S2: and comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
It should be noted that the enthalpy-increasing condition value Σ Qm for turning on and the enthalpy-increasing condition value Σ Qn for turning off can be set by the following equation:
∑Qm= K 1Qm 1+ K2Qm 2+ …+ K nQm n，
∑Qn= K 1Qn 1+ K2Qn 2+ …+ K nQn n，
wherein, Qm n、Qn nRespectively, the opening condition capacity and the closing condition capacity, K, set for the nth internal machine nThe compensation coefficients are set according to different internal machines.
Specifically, in each period, the air conditioning unit is controlled to be controlled to open the enthalpy increasing mode or close the enthalpy increasing mode under the following two conditions:
when the air conditioning unit is initially turned on,
and if the sigma Qa > sigma Qn, controlling the unit to start the enthalpy increasing mode.
When the unit is in stable operation,
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
When the air conditioning unit operates, because the control parameters of each internal unit can change, and after the enthalpy increasing mode is started, the ambient temperature of the internal unit in each period can also change, so that the sum of the heating capacity requirements of each internal unit in the air conditioning unit in each period also changes.
As shown in fig. 2, in the embodiment of the present invention, an enthalpy-increasing control system for an air conditioning unit is further provided, which includes a calculation module 21 and a control module 22. The following description will be made separately.
The calculating module 21 is configured to calculate, in real time, a sum Σ Qa of heating capacity requirements of each internal unit in the air conditioning unit in a set period.
In the embodiment of the present invention, the calculation module calculates the sum Σ Qa of the heating capacity requirements of each internal unit in the air conditioning unit in the current period as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity of the nth internal machine, and the value A is a percentage number
，
[E] The temperature deviation value between the indoor environment temperature value and the set temperature at the beginning of the current period is Qr, the rated capacity of the indoor unit is Kp, the set proportionality constant is Ki, the integral constant is Ki, Ek is the detection value of the temperature deviation value [ E ] in every other sampling period in a control period T, dt is the sampling period, and D is a correction coefficient. When the internal machine operates in a cooling mode or an air supply mode, the correction coefficient D = 0; when the internal machine operates in the heating mode, the correction coefficient D = 1.
The control module 22 is configured to compare the sum Σ Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set opening enthalpy-increasing condition value Σ Qm and closing enthalpy-increasing condition value Σ Qn, and control the air conditioning unit to open the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
When the unit is stably operated, the control module 22 controls the air conditioning unit to turn on the enthalpy increasing mode or turn off the enthalpy increasing mode according to the comparison result as follows:
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
When the air conditioning unit is initially started, the control module 22 controls the manner of turning on the enthalpy-increasing compressor or turning off the enthalpy-increasing compressor according to the comparison result as follows:
if the sigma Qa >. sigma Qn, the control module 22 controls the unit to start the enthalpy-increasing mode.
In summary, in the enthalpy-increasing control method and system of the air conditioning unit, when the air conditioning unit is subjected to enthalpy-increasing control, the sum Σ Qa of the heating capacity requirements of each internal unit in the air conditioning unit in a set period is calculated in real time, the sum Σ Qa of the heating capacity requirements of each internal unit in the air conditioning unit in the current period is compared with the set start enthalpy-increasing condition value Σ Qm and the close enthalpy-increasing condition value Σ Qn, the air conditioning unit is controlled to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result, and the enthalpy-increasing control logic is simple, so that the operating efficiency of the air conditioning unit can be improved, and the energy consumption can be reduced.
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 (10)
1. An enthalpy-increasing control method of an air conditioning unit is characterized by comprising the following steps:
calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time;
and comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
2. The enthalpy addition control method of an air conditioning unit according to claim 1, wherein controlling the air conditioning unit to turn on the enthalpy addition mode or turn off the enthalpy addition mode according to the result of the comparison includes:
when the unit is in stable operation,
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
3. The enthalpy addition control method of an air conditioning unit according to claim 2, wherein controlling the air conditioning unit to turn on the enthalpy addition mode or turn off the enthalpy addition mode according to a result of the comparison, further comprising:
when the air conditioning unit is initially turned on,
and if the sigma Qa > sigma Qn, controlling the unit to start the enthalpy increasing mode.
4. The enthalpy-adding control method for an air conditioning unit according to claim 1, wherein a sum Σ Qa of the heating capacity demands of the respective internal units in the air conditioning unit in the current cycle is calculated as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity of the nth internal machine, A is a percentage number, and A = D [ Kp X [ E ]]+
】，
[E] The temperature deviation value between the indoor environment temperature value and the set temperature at the beginning of the current period is Qr, the rated capacity of the indoor unit is Kp, the set proportionality constant is Ki, the integral constant is Ki, Ek is the detection value of the temperature deviation value [ E ] in every other sampling period in a control period T, dt is the sampling period, and D is a correction coefficient.
5. The enthalpy addition control method of an air conditioning unit according to claim 4,
when the internal machine operates in a cooling mode or an air supply mode, the correction coefficient D = 0;
when the internal machine operates in the heating mode, the correction coefficient D = 1.
6. An enthalpy addition control system of an air conditioning unit, comprising:
the calculation module is used for calculating the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in a set period in real time;
and the control module is used for comparing the sum sigma Qa of the heating capacity requirements of each internal machine in the air conditioning unit in the current period with the set start enthalpy-increasing condition value sigma Qm and the set close enthalpy-increasing condition value sigma Qn, and controlling the air conditioning unit to start the enthalpy-increasing mode or close the enthalpy-increasing mode according to the comparison result.
7. The enthalpy-increasing control system of the air conditioning unit according to claim 6, wherein the control module controls the air conditioning unit to turn on the enthalpy-increasing mode or turn off the enthalpy-increasing mode according to the comparison result when the unit is in steady operation as follows:
if the sigma Qa > sigma Qm, controlling the unit to start an enthalpy-increasing mode;
if sigma Qa < sigmaQn, controlling the unit to close the enthalpy increasing mode;
and if the sigma Qn < SigmaQa < SigmaQm, keeping the current control mode of the unit unchanged.
8. The enthalpy-increasing control system of the air conditioning unit according to claim 6, wherein when the air conditioning unit is initially started up, the control module controls the manner of turning on the enthalpy-increasing compressor or turning off the enthalpy-increasing compressor according to the comparison result as follows:
and if the sigma Qa >. sigma Qn, the control module controls the unit to start the enthalpy increasing mode.
9. The enthalpy-adding control system of an air conditioning unit according to claim 6, wherein the calculation module calculates the sum Σ Qa of the heating capacity demands of the respective internal units in the air conditioning unit in the current cycle as follows:
∑Qa = Qa 1+ Qa 2+ …+ Qa n，
Qa n =A* Qr n,
wherein, Qa nRepresents the heating capacity requirement, Qr, of the nth internal machine nRepresents the rated heating capacity of the nth internal machine, A is a percentage number, and A = D [ Kp X [ E ]]+ 
】，
[E] The temperature deviation value between the indoor environment temperature value and the set temperature at the beginning of the current period is Qr, the rated capacity of the indoor unit is Kp, the set proportionality constant is Ki, the integral constant is Ki, Ek is the detection value of the temperature deviation value [ E ] in every other sampling period in a control period T, dt is the sampling period, and D is a correction coefficient.
10. The enthalpy addition control system of an air conditioning unit according to claim 9,
when the internal machine operates in a cooling mode or an air supply mode, the correction coefficient D = 0;
when the internal machine operates in the heating mode, the correction coefficient D = 1.
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| CN105928138B (en) * | 2016-04-25 | 2021-05-25 | 广东美的制冷设备有限公司 | Air conditioner and control method thereof |
| CN107143969A (en) * | 2017-04-18 | 2017-09-08 | 天津大学 | A kind of temprature control method based on winter Xia Shuan end heat pump type air conditioning system |
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| CN107084477A (en) * | 2017-04-13 | 2017-08-22 | 青岛海尔空调器有限总公司 | Air conditioner heating operation controlling method |
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