CN114061112B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN114061112B CN114061112B CN202111424014.2A CN202111424014A CN114061112B CN 114061112 B CN114061112 B CN 114061112B CN 202111424014 A CN202111424014 A CN 202111424014A CN 114061112 B CN114061112 B CN 114061112B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 141
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- Air Conditioning Control Device (AREA)
Abstract
The air conditioning system comprises a heat pump unit and a terminal device communicated with the heat pump unit, wherein the terminal device comprises n rooms, each room comprises a capacity bypass adjusting device and a first temperature sensing device which are connected, the actual temperature Tn of the nth room is detected through the first temperature sensing device, and the opening degree of the capacity bypass adjusting device is adjusted according to the difference value delta Tn between the actual temperature Tn and the set temperature Tn so as to adjust the load of the corresponding room; the method comprises the following steps: detecting the actual temperature Tn of the nth room, presetting the set temperature Tn of any room, and calculating the difference value delta Tn between the actual temperature of the room and the set temperature, wherein delta Tn = Tn-Tn; and adjusting the current opening gamma n of the volume bypass adjusting device corresponding to the room according to different value ranges of the difference delta Tn between the actual temperature and the set temperature of the room. The self-adaptive adjustment of the load at the tail end of each room is realized by adjusting the opening of the capacity bypass adjusting device.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioning system and a control method thereof.
Background
The air source heat pump unit has good energy saving performance and environmental friendliness, and is widely applied to places such as hotels, apartments and houses as floor heating and air disc refrigeration in recent years.
In most engineering application scenarios, in order to meet the use requirements of users, the load of each room of the end equipment is always greater than the actual load, and due to changes in time and demand, most air conditioning systems are in a design load biased operating state.
In the prior art, the output of a heat pump unit and the load distribution of terminal equipment cannot be adjusted according to the load requirements of each room, so that the operating efficiency and the comfort of the whole air conditioning system can be greatly reduced.
Disclosure of Invention
The main purpose of the present application is to provide an air conditioning system and a control method thereof, which can implement self-adaptive adjustment of terminal loads of each room, and improve the operating efficiency and comfort of the air conditioning system.
According to a first aspect of the present application, there is provided an air conditioning system comprising a heat pump unit and an end device in communication with the heat pump unit; the terminal equipment comprises at least one room, and each room comprises a volume bypass adjusting device and a first temperature sensing device which are connected; the first temperature sensing device is used for detecting the actual temperature Tn of any one room, and adjusting the current opening Gamma n of the corresponding capacity bypass adjusting device according to the difference value Delta Tn between the actual temperature Tn and the set temperature Tn, so as to adjust the load of any one room.
In the alternative of this application, still include: the circulating water pump is communicated with the heat pump unit; and the second temperature sensing device is connected with the circulating water pump, the second temperature sensing device is used for detecting the inlet water temperature Ti and the outlet water temperature Tw of the heat pump unit, and the circulating water pump adjusts the running frequency of the circulating water pump according to the difference value delta T between the inlet water temperature Ti and the outlet water temperature Tw.
According to a second aspect of the present application, there is provided a control method for an air conditioning system, the air conditioning system including a heat pump unit and an end device connected to the heat pump unit, the end device including at least one room, each of the rooms having a capacity bypass adjustment device disposed therein, the control method including:
acquiring working mode information of the air conditioning system;
detecting an actual temperature Tn of the room, calculating a difference Δ Tn between the actual temperature Tn of the room and a set temperature Tn, wherein Δ Tn = Tn-Tn;
and adjusting the current opening gamma n of the capacity bypass adjusting device in the room according to the working mode of the air conditioning system and the difference value delta Tn.
In an alternative aspect of the application, said adjusting the current opening γ n of the capacity bypass adjustment device in the room according to the operation mode of the air conditioning system and the difference Δ Tn comprises:
the air conditioning system is in a heating mode, and a first temperature difference threshold value a1 and a second temperature difference threshold value b1 are preset;
when the delta Tn is larger than or equal to a1, reducing the current opening gamma n of the capacity bypass adjusting device of the corresponding room;
when b1 is less than or equal to Δ Tn and less than a1, keeping the current opening γ n of the capacity bypass adjusting device of the corresponding room;
when Δ Tn < b1, the current opening γ n of the capacity bypass adjustment device of the corresponding room is increased.
Or, the adjusting the current opening γ n of the capacity bypass adjusting device in the room according to the operation mode of the air conditioning system and the difference Δ Tn includes:
the air conditioning system is in a refrigeration mode, and a third temperature difference threshold value a2 and a fourth temperature difference threshold value b2 are preset;
when the delta Tn is larger than or equal to a2, increasing the current opening gamma n of the volume bypass adjusting device of the room;
when b2 is less than or equal to delta Tn and less than a2, keeping the current opening degree gamma n of the volume bypass adjusting device of the room;
when Δ Tn < b2, the current opening γ n of the volume bypass regulating device of the room is decreased.
In an alternative aspect of the application, said reducing the current opening γ n of the volume bypass adjustment device of the room comprises:
reducing the opening γ n of the capacity bypass adjustment device to γ n, and γ n = γ n- η γ n; wherein eta is the adjusting parameter of the capacity bypass device.
Further, the reducing the current opening γ n of the volume bypass adjusting device of the room further comprises:
detecting a trend of a current opening degree γ n of the capacity bypass adjusting device in each room;
if the current opening degree gamma n of the capacity bypass adjusting device in each room is reduced, reducing the current frequency fn of the heat pump unit;
if the current opening degree gamma n of the capacity bypass adjusting device in at least one room is in a changing trend of keeping unchanged or increasing, keeping the current frequency fn of the heat pump unit.
In an alternative aspect of the present application, the reducing the current frequency fn of the heat pump unit includes: the operation frequency of the heat pump unit is reduced to fn, and fn = fn-epsilon fn; wherein epsilon is a frequency adjusting parameter of the heat pump unit.
In an alternative aspect of the application, said increasing the opening γ n of the volume bypass adjustment means of the room comprises: the opening degree of the capacity bypass adjusting device is increased to be gamma n, and gamma n = gamma n + eta gamma n; wherein eta is the adjusting parameter of the capacity bypass device.
Further, before the increasing the opening γ n of the capacity bypass adjusting device of the room, the method further includes:
detecting the current opening degree gamma n of the volume bypass adjusting device of the corresponding room;
if the current opening degree gamma n reaches the maximum allowable value gamma max, the current frequency fn of the heat pump unit is increased;
and if the current opening degree gamma n of the volume bypass adjusting device of the corresponding room is smaller than the maximum allowable value gamma max, keeping the current frequency fn of the heat pump unit.
In an alternative aspect of the present application, the current frequency fn of the boost heat pump unit includes: the operation frequency of the heat pump unit is increased to fn, and fn = fn + epsilon fn; wherein epsilon is a frequency adjusting parameter of the heat pump unit.
The control method of the air conditioning system further comprises the following steps:
detecting an inlet water temperature Ti and an outlet water temperature Tw of the heat pump unit, and calculating a difference value delta T between the inlet water temperature Ti and the outlet water temperature Tw, wherein delta T = | -Tw |;
presetting a fifth temperature difference threshold value c and a sixth temperature difference threshold value d;
when delta T < c, reducing the current operating frequency fp of the circulating water pump;
when c is less than or equal to delta T and less than or equal to d, keeping the current running frequency fp of the circulating water pump;
when Δ T > d, the current operating frequency fp of the circulating water pump is increased.
In an alternative of the present application, the reducing the current operating frequency fp of the circulating water pump comprises: reducing the operating frequency of the circulating water pump to fp, and fp = fp- α fp; wherein alpha is a circulating water pump adjusting parameter.
In an alternative of the application, the current operating frequency fp of the lift cycle water pump comprises: raising the operating frequency of the circulating water pump to fp, and fp = fp + α fp; wherein alpha is a circulating water pump adjusting parameter.
According to the air conditioning system and the control method thereof, the actual temperature Tn of any room is detected through the first temperature sensing device, the difference value delta Tn between the actual temperature Tn and the set temperature Tn is calculated, the current opening degree of the capacity bypass adjusting device of the corresponding room is adjusted in time according to different numerical value ranges of the difference value delta Tn, the self-adaptive adjustment of the end load of each room is achieved, the load distribution of each room is adjusted according to the load requirements of each room, and therefore the operation efficiency and the comfort of the air conditioning system are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment;
FIG. 2 is a flow chart illustrating a method of controlling an air conditioning system according to one embodiment;
FIG. 3 is a flow chart illustrating a heating mode of an air conditioning system control method according to one embodiment;
FIG. 4 is a flow chart illustrating a cooling mode of a method of controlling an air conditioning system according to one embodiment;
fig. 5 is a flowchart illustrating a water flow control of a circulating water pump of an air conditioning system control method according to an embodiment.
The reference numerals are illustrated below:
10. a heat pump unit; 11. a compressor; 12. a first heat exchanger; 13. a second heat exchanger; 14. a four-way valve; 15. a gas-liquid separator;
20. a terminal device; 21. a first room; 211. a water inlet stop valve of the first room; 212. a water outlet stop valve of a first room; 213. a first capacity bypass modulation device; 22. a second room; 221. a stop valve for a water inlet of the second room; 222. a water outlet stop valve of the second room; 223. a first capacity bypass adjustment device; 23. a third room; 221. a water inlet stop valve of a third room; 232. a water outlet stop valve of a third room; 233. a third capacity bypass modulation device; 24. a fourth room; 241. a water inlet stop valve of a fourth room; 242. a water outlet stop valve of a fourth room; 243. a fourth capacity bypass modulation device; 25. a water circulating pump; 26. a water supply pipe; 261. a water outlet stop valve; 262. a water outlet temperature sensing bulb; 27. a water return pipe; 271. a water inlet stop valve; 272. a water inlet temperature sensing bulb; 28. and (6) draining the water valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In most engineering application scenarios, in order to meet the use requirements of users, the load of each room of the end equipment is always greater than the actual load, and due to changes in time and demand, most air conditioning systems are in a design load biased operating state. In the prior art, the output of a heat pump unit and the load distribution of terminal equipment cannot be adjusted according to the load requirements of each room, so that the operating efficiency and the comfort of the whole air conditioning system can be greatly reduced.
In order to solve the above problems, an embodiment of the present application provides an air conditioning system, where the air conditioning system includes a heat pump unit and a terminal device communicated with the heat pump unit, the terminal device includes n rooms, where n is greater than or equal to 1; each room comprises a capacity bypass adjusting device and a first temperature sensing device which are connected with each other; the first temperature sensing device is used for detecting the actual temperature Tn of any one room, and adjusting the current opening degree Gamma n of the corresponding capacity bypass adjusting device according to the difference value Delta Tn between the actual temperature Tn and the set temperature Tn, so as to adjust the load of any one room. The embodiment of the application further provides a control method of an air conditioning system, the air conditioning system comprises a heat pump unit and a terminal device connected with the heat pump unit, the terminal device comprises at least one room, a capacity bypass adjusting device is arranged in each room, and the control method comprises the following steps: acquiring working mode information of the air conditioning system; detecting the actual temperature Tn of a room, and calculating the difference value delta Tn = Tn-Tn between the actual temperature Tn of the room and the set temperature Tn; and adjusting the current opening degree gamma n of the capacity bypass adjusting device in the room according to the working mode of the air conditioning system and the difference value delta Tn.
It is understood by those skilled in the art that a heat pump is an energy efficient device that takes full advantage of low grade heat energy. Heat can be transferred spontaneously from a high temperature object to a low temperature object, but cannot proceed spontaneously in the opposite direction. The working principle of the heat pump is a mechanical device which forces heat to flow from a low-temperature object to a high-temperature object in a reverse circulation mode, and the heat pump can obtain larger heat supply amount only by consuming a small amount of reverse circulation net work, and can effectively utilize low-grade heat energy which is difficult to apply to achieve the purpose of energy conservation. According to different types of heat sources, the heat pump mainly comprises: air source heat pump, water source heat pump, ground source heat pump, and dual source heat pump (combination of water source heat pump and air source heat pump). Particularly, the air source heat pump unit has good energy saving performance and environmental friendliness, and is widely applied to places such as hotels, apartments and houses in recent years as floor heating and air disc refrigeration.
The following description will mainly take a heat pump unit as an air source heat pump as an example.
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment, please refer to fig. 1, the embodiment of the present application provides an air conditioning system, the air conditioning system includes a heat pump unit 10 and a terminal device 20 connected to the heat pump unit 10, the terminal device 20 includes n rooms, wherein n is greater than or equal to 1; the first temperature sensing device is used for detecting the actual temperature Tn of any one room, and adjusting the current opening degree Gamma n of the corresponding capacity bypass adjusting device according to the difference value Delta Tn between the actual temperature Tn and the set temperature Tn, so as to adjust the load of any one room.
According to the air conditioning system and the control method thereof, the actual temperature Tn of each room is detected through the first temperature sensing device, the difference value delta Tn between the actual temperature Tn and the set temperature Tn is calculated, the current opening of the capacity bypass adjusting device corresponding to the room is adjusted in time according to different numerical value ranges of the difference value delta Tn, the self-adaptive adjustment of the end load of each room is achieved, the load distribution of each room is adjusted according to the load requirements of each room, and therefore the operation efficiency and the comfort of the air conditioning system are improved.
Further, the air conditioning system further includes: the heat pump unit 10 comprises a water inlet end and a water outlet end, and the second temperature sensing device is arranged at the water inlet end and the water outlet end; the second temperature sensing device is used for detecting the inlet water temperature Ti and the outlet water temperature Tw of the heat pump unit 10, and the circulating water pump 25 adjusts its operating frequency according to a difference Δ T between the inlet water temperature Ti and the outlet water temperature Tw.
Therefore, in the embodiment of the application, the inlet water temperature Ti and the outlet water temperature Tw of the heat pump unit 10 can be detected by the second temperature sensing device, the difference value Δ T is calculated, the running frequency of the circulating water pump 25 is adjusted according to the difference value Δ T, and the linkage running of the heat pump unit 10, the circulating water pump 25 and the terminal device 20 is realized, so that the running efficiency and the overall comfort of the whole air conditioning system are improved.
Specifically, n rooms of the end device 20 are arranged in parallel, the n rooms are respectively communicated with a water supply pipe 26 and a water return pipe 27 after being connected in parallel, the starting end of the water supply pipe 26 is communicated with a water outlet end, and the tail end of the water return pipe 27 is communicated with a water inlet end, so that the whole air conditioning system forms a circulating water path, and the water path is controlled by the circulating water pump 25.
Further, as for the heat pump unit 10, the heat pump unit 10 includes a compressor 11, a gas-liquid separator 15, a first heat exchanger 12 and a second heat exchanger 13, the compressor 11 is respectively communicated with the gas-liquid separator 15, the first heat exchanger 12 and the second heat exchanger 13 through a four-way valve 14, the first heat exchanger 12 is communicated with the second heat exchanger 13, wherein the first heat exchanger 12 is a fin-type heat exchanger, and the second heat exchanger 13 is a double-pipe heat exchanger.
The end device 20 includes four rooms arranged in parallel, namely, a first room 21, a second room 22, a third room 23, and a fourth room 24, the first room 21 is provided with a first room water inlet stop valve 211, a first room water outlet stop valve 212, a first volume bypass adjusting device 213, and a first thermal bulb, the second room 22 is provided with a second room water inlet stop valve 221, a second room water outlet stop valve 222, a second volume bypass adjusting device 223, and a second thermal bulb, the third room 23 is provided with a third room water inlet stop valve 231, a third room water outlet stop valve 232, a third volume bypass adjusting device 233, and a third thermal bulb, and the fourth room 24 is provided with a fourth room water inlet stop valve 241, a fourth room water outlet stop valve 242, a fourth volume bypass adjusting device 243, and a fourth thermal bulb. The water inlets of the four rooms are communicated with a water supply pipe 26, the water outlets of the four rooms are respectively communicated with a water return pipe 27, a water outlet stop valve 261 and a water inlet stop valve 271 are respectively arranged on the water supply pipe 26 and the water return pipe 27, a water outlet temperature sensing bulb 262 is arranged between the water inlet stop valve 271 and the second heat exchanger 13, a water inlet temperature sensing bulb 272 is arranged between the water outlet stop valve 261 and the second heat exchanger 13, and the circulating water pump 25 is arranged between the water inlet temperature sensing bulb 272 and the water inlet stop valve 271. In addition, a drain valve 28 is provided at the end of the return pipe 27 remote from the heat pump unit 10.
Fig. 2 is a flowchart illustrating a control method of an air conditioning system according to an embodiment, please refer to fig. 2, based on the air conditioning system, an embodiment of the present application provides a control method based on the air conditioning system, the method includes the following steps:
s001, obtaining working mode information of the air conditioning system;
s002, detecting the actual temperature Tn of the room, and calculating the difference value delta Tn = Tn-Tn between the actual temperature Tn of the room and the set temperature Tn;
and S003, adjusting the current opening degree gamma n of the capacity bypass adjusting device in the room according to the working mode of the air conditioning system and the difference value delta Tn.
According to the control method of the air conditioning system, the difference value delta Tn between the indoor temperature Tn of each room and the set temperature Tn is detected, the current opening degree of the capacity bypass adjusting device corresponding to the room is adjusted in time according to the difference value delta Tn, the self-adaptive adjustment of the terminal load of each room is achieved, the load distribution of each room is adjusted according to the load requirement of each room, and therefore the operation efficiency and the comfort of the air conditioning system are improved.
Fig. 3 is a flowchart illustrating a heating mode of an air conditioning system control method according to an embodiment. Referring to fig. 3, in the step S002, when the operation mode is the heating mode, the method further includes the following steps:
presetting a first temperature difference threshold value a1=1 and a second temperature difference threshold value b1=0;
when the delta Tn is larger than or equal to a1, reducing the current opening gamma n of the capacity bypass adjusting device of the corresponding room, and specifically reducing the current opening gamma n of the capacity bypass adjusting device to the opening gamma n = gamma n-eta gamma n; wherein eta is a capacity bypass device adjusting parameter, and gamma n is an opening degree to which the capacity bypass adjusting device of the nth room needs to be adjusted at the next moment;
when b1 is not more than delta Tn and less than a1, keeping the current opening gamma n of the volume bypass adjusting device of the corresponding room;
when Δ Tn < b1, increasing the opening γ n of the capacity bypass adjustment device corresponding to the room, specifically to the opening γ n = γ n + η γ n of the capacity bypass adjustment device; wherein η is a capacity bypass device adjusting parameter, and γ n is an opening degree to which the capacity bypass adjusting device of the nth room needs to be adjusted at the next moment.
Further, in the step of reducing the current opening γ n of the capacity bypass adjustment device of the corresponding room, the method further includes:
detecting the variation trend of the current opening degree gamma n of the capacity bypass adjusting device in all the rooms;
if the current opening γ n of all the capacity bypass adjusting devices is decreased, it indicates that the output load of the heat pump unit 10 is greater than the room load demand, and the current frequency fn of the heat pump unit 10 should be decreased, specifically: reducing the operating frequency of the heat pump unit 10 to fn = fn-epsilon fn; wherein epsilon is a frequency adjusting parameter of the heat pump unit 10, fn is an operating frequency to be adjusted at the next moment of the heat pump unit, and after t3 time, next judgment is performed, wherein t3 is a time parameter used for determining the next detection and adjustment time, t3= alpha/delta Tn, alpha is an adjustable range value, and alpha =30min-60min.
If the current opening γ n of at least one of the capacity bypass adjusting devices is kept unchanged or increased, it indicates that the output load of the heat pump unit 10 can meet the room load demand, the current frequency fn of the heat pump unit 10 is kept, and the next judgment is performed after the operation is performed for t4 time, where t4 is a time parameter for determining the next detection and adjustment time, t4= β/Δ Tn, β is an adjustable range value, and β =30min-60min.
Further, before the step of increasing the opening γ n of the capacity bypass adjustment device for the corresponding room, the method further includes:
detecting the current opening degree gamma n of the volume bypass adjusting device of the corresponding room;
if the current opening γ n of the volume bypass adjusting device corresponding to the room reaches the maximum allowable value γ max, it indicates that the output load of the heat pump unit 10 cannot meet the load demand of the room, and the current operating frequency fn of the heat pump unit 10 should be increased, specifically: increasing the operating frequency of the heat pump unit 10 to fn = fn + epsilon fn, where epsilon is a frequency adjusting parameter of the heat pump unit 10, fn is an operating frequency to be adjusted at the next moment of the unit, and after t3 time of operation, performing next judgment;
and if the current opening degree gamma n of the volume bypass adjusting device of the corresponding room is less than the maximum allowable value gamma max, keeping the current frequency fn of the heat pump unit 10, and after the operation for t4 time, performing next judgment.
The current opening γ n of the capacity bypass regulator is calculated by: acquiring an outdoor environment temperature T0, a solar radiation quantity qs (which can be inquired by local climate conditions) and a heat transfer coefficient kn (which can be acquired by arrangement of inner and outer walls of a room and design parameters of building materials) of an nth room maintenance structure, and presetting an nth room set temperature Tn; calculating the load Qn = Q (kn, tn, T0, qs) of the nth room and the total load Qtotal = Q1+ Q2+ … + Qn of all the rooms to obtain the percentage of the load of the nth room to the total load φ n = Qn/Q General assembly X is 100%; and determining the current opening gamma n of the capacity bypass adjusting device of the nth room according to the percentage phi n of the load of the nth room to the total load. Specifically, the opening degree adjusting range of the capacity bypass adjusting device is 0-100%.
Method for calculating the current operating frequency fn of the heat pump unit 10: presetting the internal temperature T0 of each room, presetting the outlet water temperature Tw of the heat pump unit 10, and calculating the current running frequency fn = (Qtotal, T0, tw) of the heat pump unit 10 according to the rated water flow Q.
Fig. 4 is a flowchart illustrating a cooling mode of an air conditioning system control method according to an embodiment, where in the step S002, the steps in the cooling mode state are the same as those in the heating mode state, and the difference is that: the air conditioning system is in a refrigeration mode, and a third temperature difference threshold value a2 and a fourth temperature difference threshold value b2 are preset; when the delta Tn is larger than or equal to a2, increasing the current opening gamma n of the volume bypass adjusting device of the room; when b2 is less than or equal to delta Tn and less than a2, keeping the current opening degree gamma n of the volume bypass adjusting device of the room; when Δ Tn < b2, the current opening γ n of the capacity bypass regulating device of the room is reduced, wherein a2=1, b2=0.
Fig. 5 is a flowchart illustrating a water flow control of the circulating water pump 25 according to an embodiment, and referring to fig. 5, the method further includes:
detecting an inlet water temperature Ti and an outlet water temperature Tw of a heat pump unit 10, and calculating a difference delta T = | Tw | of the inlet water temperature and the outlet water temperature in real time;
presetting a fifth temperature difference threshold c =0.9 Δ T and a sixth temperature difference threshold d =1.1 Δ T, wherein Δ T is a set temperature difference between a water inlet end and a water outlet point of the heat pump unit 10;
when Δ T < c, it indicates that the circulating water flow is too large, the frequency of the circulating water pump 25 is too high, and it is necessary to reduce the current operating frequency fp of the circulating water pump 25, and reduce the operating frequency of the circulating water pump 25 to fp = fp- α fp; wherein α is an adjusting parameter of the circulating water pump 25, fp is a frequency to be adjusted by the circulating water pump 25 at the next moment, the next judgment is performed after the operation is performed for T1 time, T1 is a time parameter used for determining the next detection and adjustment time, T1= a/Δ T, a is an adjustable range value, and a = 30-60 min;
when c is not less than delta T and not more than d, keeping the current operation frequency fp of the circulating water pump 25, and performing next judgment after T2 time, wherein T2 is a time parameter and is used for determining next detection and adjustment time, T2= b/delta T, b is an adjustable range value, and b = 30-60 min;
when Δ T > d, it indicates that the circulating water flow is too small, the water pump frequency is too low, which affects indoor side heat exchange, and the current operation frequency fp of the circulating water pump 25 should be increased, and the operation frequency of the circulating water pump 25 should be increased to fp = fp + α fp; wherein α is a regulating parameter of the circulating water pump 25, fp is a frequency to be regulated by the circulating water pump 25 at the next moment, and the next judgment is performed after the circulating water pump 25 runs for t1 time.
The current operating frequency fp of the circulating water pump 25 is calculated by: according to the current running frequency fn of the heat pump unit 10 and the internal temperature T of each room 0 Presetting a difference value delta T between the inlet water temperature and the outlet water temperature of the heat pump unit 10 and rated water flow q, and calculating the capacity Qh = (fn, T0, tw, q) of the heat pump unit 10; according to the capacity Qh of the heat pump unit 10, the difference value delta T between the inlet water temperature and the outlet water temperature of the heat pump unit 10 is preset, and the circulating water flow q of the system is calculated p (ii) = Qh/(c Δ T), wherein Δ T > 0,c is the specific heat capacity of water; according to the flow q of the circulating water of the system p Adjustment cycleThe current operating frequency fp of the water pump 25.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A control method of an air conditioning system, the air conditioning system comprises a heat pump unit and a terminal device connected with the heat pump unit, the terminal device comprises at least one room, and a capacity bypass adjusting device is arranged in each room, the control method comprises the following steps:
acquiring working mode information of the air conditioning system;
detecting an actual temperature Tn of a room, and calculating a difference value delta Tn between the actual temperature Tn of the room and a set temperature Tn, wherein delta Tn = Tn-Tn;
adjusting the current opening degree gamma n of a capacity bypass adjusting device in the room according to the working mode of the air conditioning system and the difference value delta Tn;
detecting a trend of a current opening degree γ n of the capacity bypass adjusting device in each room;
if the current opening degree gamma n of the capacity bypass adjusting device in each room is reduced, the current frequency fn of the heat pump unit is reduced, and the next judgment is carried out after the operation for t3 time;
and if the current opening degree gamma n of the capacity bypass adjusting device in at least one room is kept unchanged or increased, keeping the current frequency fn of the heat pump unit, and performing next judgment after running for t4 time.
2. The method of claim 1, wherein said adjusting a current opening γ n of a capacity bypass adjustment device in the room based on the operating mode of the air conditioning system and the difference Δ Tn comprises:
the air conditioning system is in a heating mode, and a first temperature difference threshold value a1 and a second temperature difference threshold value b1 are preset;
when the delta Tn is larger than or equal to a1, reducing the current opening gamma n of the capacity bypass adjusting device of the corresponding room;
when b1 is not more than delta Tn and less than a1, keeping the current opening gamma n of the volume bypass adjusting device of the corresponding room;
when Δ Tn < b1, the current opening γ n of the capacity bypass adjustment device of the corresponding room is increased.
3. The method of claim 2, wherein said adjusting a current opening γ n of a capacity bypass adjustment in the room based on the operating mode of the air conditioning system and the difference Δ Tn comprises:
the air conditioning system is in a refrigeration mode, and a third temperature difference threshold value a2 and a fourth temperature difference threshold value b2 are preset;
when the delta Tn is larger than or equal to a2, increasing the current opening gamma n of the volume bypass adjusting device of the room;
when b2 is less than or equal to delta Tn and less than a2, keeping the current opening degree gamma n of the volume bypass adjusting device of the room;
when Δ Tn < b2, the current opening γ n of the capacity bypass regulating device of the room is decreased.
4. A method according to claim 2 or 3, wherein said reducing the current opening γ n of the volume bypass adjustment means of the room comprises:
reducing the opening γ n of the capacity bypass adjustment device to γ n, and γ n = γ n- η γ n; wherein eta is the adjusting parameter of the capacity bypass device.
5. The method of claim 1, wherein reducing the current frequency fn of the heat pump unit comprises:
the operation frequency of the heat pump unit is reduced to fn, and fn = fn-epsilon fn; wherein epsilon is a frequency adjusting parameter of the heat pump unit.
6. A method according to claim 2 or 3, wherein said increasing the opening γ n of the volume bypass adjustment means of the room comprises:
the opening degree of the capacity bypass adjusting device is increased to be gamma n, and gamma n = gamma n + eta gamma n; wherein eta is the adjusting parameter of the capacity bypass device.
7. A method according to claim 2 or 3, characterized in that before said increasing the opening γ n of the capacity bypass adjustment means of the room, it further comprises:
detecting the current opening degree gamma n of the volume bypass adjusting device of the corresponding room;
if the current opening degree gamma n reaches the maximum allowable value gamma max, the current frequency fn of the heat pump unit is increased;
and if the current opening degree gamma n of the volume bypass adjusting device of the corresponding room is smaller than the maximum allowable value gamma max, keeping the current frequency fn of the heat pump unit.
8. The method of claim 7, wherein raising the current frequency fn of the heat pump unit comprises:
the operation frequency of the heat pump unit is increased to fn, and fn = fn + epsilon fn; wherein epsilon is a frequency adjusting parameter of the heat pump unit.
9. The method of claim 1, further comprising:
detecting an inlet water temperature Ti and an outlet water temperature Tw of the heat pump unit, and calculating a difference value delta T between the inlet water temperature Ti and the outlet water temperature Tw, wherein delta T = | -Tw |;
presetting a fifth temperature difference threshold value c and a sixth temperature difference threshold value d;
when delta T < c, reducing the current operating frequency fp of the circulating water pump;
when c is less than or equal to delta T and less than or equal to d, keeping the current running frequency fp of the circulating water pump;
when Δ T > d, the current operating frequency fp of the circulating water pump is increased.
10. The method of claim 9, wherein reducing the current operating frequency fp of the circulating water pump comprises:
reducing the operating frequency of the circulating water pump to fp, and fp = fp- α fp; wherein alpha is a circulating water pump adjusting parameter.
11. The method of claim 9, wherein the current operating frequency fp of the lift cycle water pump comprises:
raising the operating frequency of the circulating water pump to fp, and fp = fp + α fp; wherein alpha is a circulating water pump adjusting parameter.
12. An air conditioning system is characterized by comprising a heat pump unit and terminal equipment communicated with the heat pump unit; the terminal equipment comprises at least one room, and each room comprises a volume bypass adjusting device and a first temperature sensing device which are connected with each other; the first temperature sensing device is used for detecting the actual temperature Tn of any one room, and adjusting the current opening degree Gamma n of the corresponding capacity bypass adjusting device according to the difference value Delta Tn between the actual temperature Tn and the set temperature Tn, so as to adjust the load of any one room.
13. The air conditioning system of claim 12, further comprising:
the circulating water pump is communicated with the heat pump unit; and the number of the first and second groups,
and the second temperature sensing device is connected with the circulating water pump and is used for detecting the inlet water temperature Ti and the outlet water temperature Tw of the heat pump unit, and the circulating water pump adjusts the running frequency of the circulating water pump according to the difference value delta T between the inlet water temperature Ti and the outlet water temperature Tw.
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