CN110701747B - Control method of air conditioning system - Google Patents

Control method of air conditioning system Download PDF

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Publication number
CN110701747B
CN110701747B CN201910917889.2A CN201910917889A CN110701747B CN 110701747 B CN110701747 B CN 110701747B CN 201910917889 A CN201910917889 A CN 201910917889A CN 110701747 B CN110701747 B CN 110701747B
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China
Prior art keywords
throttling device
air conditioning
conditioning system
control method
heat exchanger
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CN201910917889.2A
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CN110701747A (en
Inventor
倪毅
薛寒冬
傅英胜
李龙飞
王芳
赵振江
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/70—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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method of an air conditioning system, wherein the method comprises the following steps: comprises a detection step for detecting the operation mode of the air conditioning system and the outdoor environment temperature TOuter ringIndoor ambient temperature TInner ring(ii) a Further comprising a judging step of judging whether the operation mode is operated to the heating mode or not and judging TOuter ringWhether less than A, where A is a constant; further comprising a control step for controlling the operation mode to a heating mode, and TOuter ringIf < A, the fourth throttle device is controlled to be opened, and T is detectedIs provided with‑TInner ringWhen the opening degree of the fourth throttling device is larger than C, the opening degree of the fourth throttling device is controlled to be reduced; if T is detectedIs provided with‑TInner ring< D, the opening degree of the fourth throttle device is controlled to be increased, wherein C, D are all constant. The invention ensures that the indoor temperature fluctuation is small during the defrosting period of the whole air conditioning system, the time for recovering heat supply is shorter, the heat supply can be recovered quickly, and the sustainable indoor heating is effectively ensured.

Description

Control method of air conditioning system
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an air conditioning system.
Background
The air source heat pump frosting problem is a key technical problem of an air conditioner, and has obvious influence on heating performance and comfort. The total area of the hot summer and cold winter areas, the cold areas and the severe cold areas accounts for about 85 percent of the total area of the whole country. These areas require heating in the winter, and most of them have frosting during heating in the winter.
When the traditional heat pump air conditioner operates in winter for heat supply, a four-way valve reversing defrosting method is adopted. This solution is simple to operate, but has the following drawbacks: 1. the indoor temperature fluctuation is big, and thermal comfort is poor, 2, the temperature rises slowly again, and interior fan after the defrosting, need wait that the inner tube temperature rises after can reopen, and frequency conversion compressor rises frequently and need experience a section process, has prolonged the time of resumeing the heat supply. 3. Long defrosting time, and insufficient low-level heat source under the condition of severe frosting, thereby further prolonging the defrosting time and the heat recovery time.
The air conditioner in the prior art has the defects of large indoor temperature fluctuation and poor thermal comfort degree during defrosting; the temperature rises slowly, the inner fan can be restarted after the temperature of the inner pipe rises after defrosting is finished, and the frequency rising of the variable frequency compressor needs to go through a process, so that the time for recovering heat supply is prolonged; the defrosting time is long, and under the condition of severe frosting, the low-level heat source is insufficient, so that the technical problems of prolonging the defrosting time, recovering the heat supply time and the like are further solved, and therefore the control method of the air conditioning system is researched and designed.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of the air conditioner in the prior art that the indoor temperature fluctuation is large during defrosting, the heat recovery time is long, and the indoor sustainable heating cannot be ensured, so as to provide a control method of an air conditioning system.
The invention provides a control method of an air conditioning system, wherein the method comprises the following steps:
the air conditioning system comprises a compressor, an outer heat exchanger, a heat storage module and an indoor unit, wherein a fourth throttling device is further arranged on a pipeline between the heat storage module and the outer heat exchanger;
the control method comprises a detection step for detecting the operation mode of the air conditioning system and the outdoor environment temperature TOuter ringIndoor ambient temperature TInner ring；
Further comprising a judging step of judging whether the operation mode is operated to the heating mode or not and judging TOuter ringWhether less than A, where A is a constant;
further comprising a control step for controlling the operation mode to a heating mode, and TOuter ringWhen the signal is less than A, the fourth throttling device is controlled to be opened, and T is detectedIs provided with-TInner ringWhen the opening degree of the fourth throttling device is larger than C, the opening degree of the fourth throttling device is controlled to be reduced; if T is detectedIs provided with-TInner ring< D, controlling the opening degree of the fourth throttling device to be increased, wherein C, D are all constant.
Preferably, the first and second electrodes are formed of a metal,
the opening initial value of the fourth throttling device is B, and the value range of B is (0, 480) pls; and/or wherein A is at (5, 10) DEG C; and/or the value range of C is (3, 5) DEG C; and/or the value range of D is (0, 3) DEG C.
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to, in the step of controlling the opening degree of the fourth throttling device to be decreased, control the fourth throttling device to operate once every t1, where the number of steps per decrease is: a C, wherein a is a constant.
Preferably, the first and second electrodes are formed of a metal,
wherein the value range of t1 is (0, 5) min, and the value range of a is (0, 100).
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to, in the step of controlling the opening degree of the fourth throttling device to be increased, control the fourth throttling device to operate once every t2, where the number of steps per increase is: b x D, wherein b is a constant.
Preferably, the first and second electrodes are formed of a metal,
wherein the value range of t2 is (0, 5) min, and the value range of b is (0, 50).
Preferably, the first and second electrodes are formed of a metal,
the control step is also for judging when T is present in the judging stepOuter ringAnd when the pressure is higher than A, controlling the fourth throttling device to close.
Preferably, the first and second electrodes are formed of a metal,
and the control step is also used for controlling the fourth throttling device to be closed when the judging step judges that the running mode is the refrigeration mode.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the second throttling device and the third throttling device are controlled to be opened in the heating mode or the refrigerating mode through the control step.
Preferably, the first and second electrodes are formed of a metal,
and the control step is also used for controlling the fourth throttling device to be opened to the maximum opening degree when the judging step judges that the running mode is the defrosting mode.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the control step further controls the second throttling device to be opened and the third throttling device to be closed in the defrosting mode.
The control method of the air conditioning system provided by the invention has the following beneficial effects:
according to the invention, by detecting the operation mode, the T outer ring and the T inner ring and judging the operation mode, the T outer ring and the T inner ring, when the operation mode is operated to the heating mode, and the T outer ring and the T inner ring are in the heating modeOuter ringWhen the temperature is lower than A, the outdoor temperature is low enough to cause the risk of frost formation, the heat storage module needs to be started for heat storage to prepare for defrosting heat, so that the fourth throttling device is controlled to be started, and T is detectedIs provided with-TInner ringWhen the temperature is higher than the preset temperature, the difference between the indoor temperature and the set temperature is larger, so that the opening degree of the fourth throttling device is controlled to be reduced, the heating quantity of the heat storage module can be effectively reduced, the indoor heating quantity is sufficient, the indoor sustainable heating is ensured, and the T is detectedIs provided with-TInner ringD, the difference between the indoor temperature and the set temperature is small, and the indoor heat demand is small, so that the opening degree of the fourth throttling device is controlled to be increased, the heat storage capacity at the moment is improved, and the condition that enough heat is available for defrosting is ensuredThe defrosting device has the advantages that the defrosting device is used for defrosting the whole air conditioning system, so that the fluctuation of the indoor temperature is small, the time for recovering heat supply is short, the heat supply can be recovered quickly, and the indoor sustainable heating is effectively ensured.
Drawings
Fig. 1 is a schematic view of the structure of an air conditioning system of the present invention.
The reference numbers in the figures denote:
1. a compressor; 2. an external heat exchanger; 3. an indoor unit; 31. a first heat exchanger; 32. a second heat exchanger; 4. a heat storage module; 51. a first throttling device (or EXV 1); 52. a second throttling device (or EXV 2); 53. a third throttling device (or EXV 3); 54. a fourth throttling device (or EXV 4); 55. a large valve; 56. a small valve; 61. a first four-way valve; 62. a four-way valve II; 7. a gas-liquid separator; 8. an oil separator; 91. an electromagnetic valve; 92. a third valve; 10. and (4) an oil return capillary tube.
Detailed Description
As shown in fig. 1, the present invention provides a control method of an air conditioning system, which includes:
the air conditioning system comprises a compressor 1, an outer heat exchanger 2, an outer fan, a first four-way valve 61, a second four-way valve 62, a large valve 55, a small valve 56, a third valve 92, a heat storage module 4 and an indoor unit 3, wherein a fourth throttling device 54 is further arranged on a pipeline between the heat storage module 4 and the outer heat exchanger 2;
the control method comprises a detection step for detecting the operation mode of the air conditioning system, an outdoor environment temperature T outer ring and an indoor environment temperature T inner ring;
further comprising a judging step of judging whether the operation mode is operated to the heating mode or not and judging TOuter ringWhether less than A, where A is a constant;
further comprising a control step for controlling the operation mode to a heating mode, and TOuter ring< A, the fourth throttle device 54 is controlled to be opened, and T is detectedIs provided with-TInner ringWhen the opening degree of the fourth throttling device 54 is larger than C, the opening degree is controlled to be reduced; if T is detected to be set as-T inner ring < D, the opening degree of the fourth throttling device 54 is controlled to be increased, wherein C, D are all constants。
According to the invention, by detecting the operation mode, the T outer ring and the T inner ring and judging the operation mode, the T outer ring and the T inner ring, when the operation mode is operated to the heating mode, and the T outer ring and the T inner ring are in the heating modeOuter ringWhen the temperature is lower than A, the outdoor temperature is low enough to cause the risk of frost formation, the heat storage module needs to be started for heat storage to prepare for defrosting heat, so that the fourth throttling device is controlled to be started, and T is detectedIs provided with-TInner ringWhen the temperature is higher than the preset temperature, the difference between the indoor temperature and the set temperature is larger, so that the opening degree of the fourth throttling device is controlled to be reduced, the heating quantity of the heat storage module can be effectively reduced, the indoor heating quantity is sufficient, the indoor sustainable heating is ensured, and the T is detectedIs provided with-TInner ringD, the difference between the indoor temperature and the set temperature is small, and the indoor heat demand is small, so that the opening degree of the fourth throttling device is controlled to be increased, the heat storage capacity at the moment is improved, and sufficient heat is generated for defrosting during defrosting, so that the fluctuation of the indoor temperature is small during defrosting of the whole air conditioning system, the heat recovery time is short, the heat recovery can be performed quickly, and the indoor sustainable heating is effectively guaranteed.
Preferably, the first and second electrodes are formed of a metal,
the opening degree initial value of the fourth throttling device 54 is B, and the value range of B is (0, 480) pls; and/or wherein A is at (5, 10) DEG C; and/or the value range of C is (3, 5) DEG C; and/or the value range of D is (0, 3) DEG C. The value range of the opening initial value B of the fourth throttling device can effectively control the flow of the refrigerant in the pipeline of the heat storage module; the value range of A is (5, 10) deg.C, which means that the outdoor unit will not frost when the outdoor environment temperature T is above 5-10 deg.C, so that no heat accumulation is needed, the fourth throttling device 54, i.e. EXV4, can be closed, and when the outdoor environment temperature T is above 5-10 deg.COuter ringWhen frosting happens at the temperature below 5-10 ℃, heat storage is needed, and the fourth throttling device 54, namely the EXV4, is opened for heat storage; the value range of C is (3, 5) DEG C, which is T of the inventionIs provided with-TInner ringIf greater than the lower limit of the preferred rangeWhen the indoor environment temperature does not reach the ideal state, the opening degree of the EXV4 needs to be reduced so as to avoid influencing the indoor heating capacity; the value range of D is (0, 3) DEG C, which is T of the inventionIs provided with-TInner ringIf less than the lower limit indicates that the indoor ambient temperature has reached the desired state, at which time it is not necessary to increase the amount of heating in the room, the opening of the EXV4 may be adjusted to store heat in the heat storage module.
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to, in the step of controlling the opening degree of the fourth throttle device 54 to be decreased, control the fourth throttle device 54 to operate once at time t1, where the number of steps per decrease is: a C, wherein a is a constant. The aim of controlling the opening degree of the fourth throttling device to be reduced can be fulfilled through the step, and the control and detection modes can be effectively combined through the interval control means, so that the T can be accurately controlledInner ringTemperature up to TIs provided withThe purpose of (1).
Preferably, the first and second electrodes are formed of a metal,
wherein the value range of t1 is (0, 5) min, and the value range of a is (0, 100). The optimal value range of the interval detection time T1 and the value range of the step coefficient a can realize the aim of accurately controlling the temperature rise or fall, so that the T is accurately controlledInner ringTemperature up to TIs provided with。
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to, in the step of controlling the opening degree of the fourth throttle device 54 to be increased, control the fourth throttle device 54 to operate once at a time t2, where the number of steps per increase is: b x D, wherein b is a constant. The aim of controlling the opening degree of the fourth throttling device to be increased can be fulfilled through the step, and the control and detection modes can be effectively combined through the interval control means, so that the T can be accurately controlledInner ringTemperature up to TIs provided withThe purpose of (1).
Preferably, the first and second electrodes are formed of a metal,
wherein t2 takes the value of (0, 5) min, and b takes the value range of (0, 50). This is the interval detection time t2 of the present inventionThe optimal value range and the value range of the step coefficient b can realize the purpose of accurately controlling the temperature rise or fall, so that the T is accurately controlledInner ringTemperature up to TIs provided with。
Preferably, the first and second electrodes are formed of a metal,
the control step is also for judging when T is present in the judging stepOuter ringAnd > A, the fourth throttle device 54 is controlled to be closed. To explain that when the outdoor environment temperature T is above a, the outdoor unit will not frost, so that no heat storage is needed, and at this time, the fourth throttling device 54, i.e., the EXV4, can be closed to ensure the original indoor heating.
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to control the fourth throttling device 54 to be turned off when the determining step determines that the operation mode is the cooling mode. The EXV4 is closed to ensure normal heating capacity in the room during the cooling mode since the outdoor temperature is usually high and there is no need to store heat in the heat storage module.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the second throttling device and the third throttling device are controlled to be opened in the heating mode or the refrigerating mode through the control step. The invention is the preferable structure form and the control steps of the indoor unit, thus both the two heat exchangers in the indoor unit can be controlled to carry out cooling or heating, and the indoor cooling capacity or heating capacity is improved.
Preferably, the first and second electrodes are formed of a metal,
the controlling step is further configured to control the fourth throttling device 54 to be opened to a maximum opening degree when the determining step determines that the operation mode is the defrosting mode. By the aid of the method, all heat storage amount of the heat storage module can be used for defrosting of the outdoor heat exchanger, so that defrosting effect is improved.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the control step further controls the second throttling device to be opened and the third throttling device to be closed in the defrosting mode. The invention relates to an indoor unit, which comprises a heat exchanger, a heat exchanger and a control device, wherein the heat exchanger is arranged in the heat exchanger, and the control device is used for controlling the heat exchanger to heat.
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. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (11)

1. A control method of an air conditioning system is characterized in that:
the air conditioning system comprises a compressor (1), an outer heat exchanger (2), a heat storage module (4) and an indoor unit (3), wherein a fourth throttling device (54) is further arranged on a pipeline between the heat storage module (4) and the outer heat exchanger (2);
the control method comprises a detection step for detecting the operation mode of the air conditioning system and the outdoor environment temperature TOuter ringIndoor ambient temperature TInner ring；
Further comprising a judging step of judging whether the operation mode is operated to the heating mode or not and judging TOuter ringWhether less than A, where A is a constant;
further comprising a control step for controlling the operation mode to a heating mode, and TOuter ringIf < A, the fourth throttle device (54) is controlled to be opened, and T is detectedIs provided with-TInner ringWhen the opening degree of the fourth throttling device (54) is controlled to be larger than CSmall; and if T is set to be-Tinner ring < D, controlling the opening degree of the fourth throttling device (54) to be increased, wherein C, D are constants.
2. The control method of an air conditioning system according to claim 1, characterized in that:
the opening degree initial value of the fourth throttling device (54) is B, and the value range of B is (0, 480) pls; and/or wherein A is at (5, 10) DEG C; and/or the value range of C is (3, 5) DEG C; and/or the value range of D is (0, 3) DEG C.
3. The control method of an air conditioning system according to claim 1 or 2, characterized in that:
the control step is also used for controlling the fourth throttling device (54) to act once every t1 in the step of controlling the opening degree of the fourth throttling device (54) to be reduced, and the number of steps of reduction is as follows: a C, wherein a is a constant.
4. The control method of an air conditioning system according to claim 3, characterized in that:
wherein the value range of t1 is (0, 5) min, and the value range of a is (0, 100).
5. The control method of an air conditioning system according to any one of claims 1-2, characterized in that:
the control step is also used for controlling the fourth throttling device (54) to act once every t2 in the step of controlling the opening degree of the fourth throttling device (54) to be increased, and the increasing steps are as follows: b x D, wherein b is a constant.
6. The control method of an air conditioning system according to claim 5, characterized in that:
wherein t2 takes the value of (0, 5) min, and b takes the value range of (0, 50).
7. The control method of an air conditioning system according to any one of claims 1-2, characterized in that:
the control step is also for judging when T is present in the judging stepOuter ringAnd when the pressure is higher than A, the fourth throttling device (54) is controlled to be closed.
8. The control method of an air conditioning system according to any one of claims 1-2, characterized in that:
and the control step is also used for controlling the fourth throttling device (54) to be closed when the operation mode is judged to be the refrigeration mode in the judging step.
9. The control method of an air conditioning system according to any one of claims 1-2, characterized in that:
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the second throttling device and the third throttling device are controlled to be opened in the heating mode or the refrigerating mode through the control step.
10. The control method of an air conditioning system according to any one of claims 1-2, characterized in that:
and the control step is also used for controlling the fourth throttling device (54) to be opened to the maximum opening degree when the judging step judges that the running mode is the defrosting mode.
11. The control method of an air conditioning system according to claim 10, characterized in that:
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, a second throttling device is further arranged and connected with the heat exchanger II, a third throttling device is further arranged and connected with the heat exchanger I, and the control step further controls the second throttling device to be opened and the third throttling device to be closed in the defrosting mode.
CN201910917889.2A 2019-09-26 2019-09-26 Control method of air conditioning system Active CN110701747B (en)

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CN106225290A (en) * 2016-07-15 2016-12-14 珠海格力电器股份有限公司 Air-conditioning and control method thereof

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JP4909663B2 (en) * 2006-07-20 2012-04-04 三洋電機株式会社 Air conditioner
CN103423927A (en) * 2012-05-15 2013-12-04 约克广州空调冷冻设备有限公司 Defrosting method used for air source heat pump system
CN104567149A (en) * 2013-10-16 2015-04-29 海尔集团公司 Low-temperature heat-storage defrosting-assisting air conditioner and control method
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