CN111878961A - VRF air conditioning system and control method and control device thereof - Google Patents
VRF air conditioning system and control method and control device thereof Download PDFInfo
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- CN111878961A CN111878961A CN202010565765.5A CN202010565765A CN111878961A CN 111878961 A CN111878961 A CN 111878961A CN 202010565765 A CN202010565765 A CN 202010565765A CN 111878961 A CN111878961 A CN 111878961A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 226
- 239000003507 refrigerant Substances 0.000 claims description 39
- 238000005338 heat storage Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000004069 differentiation Effects 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 230000010485 coping Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
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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
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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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a control system, a control method and a control device of a VRF air conditioner, wherein the control method comprises the following steps: detecting the water outlet temperature at the water outlet; and the opening degree of the first throttling part and/or the second throttling part is/are adjusted according to the outlet water temperature, and under the condition that the outlet water temperature can be adjusted by adjusting the opening degrees of the first throttling part and the second throttling part, the opening degree of the second throttling part is preferentially adjusted. The invention can meet the air conditioning requirement of an indoor heat exchanger and supply hot water to an external water terminal. In addition, the second throttling part is set as the throttling part which is adjusted preferentially, so that the outlet water temperature can be adjusted more timely.
Description
Technical Field
The invention relates to the technical field of air treatment, in particular to a VRF air conditioning system and a control method and a control device thereof.
Background
An air conditioner generally has a cooling mode and a heating mode, and cooling or heating energy is supplied to an indoor space by circulating a refrigerant through a loop formed by a compressor, a condenser, a throttling part (such as an electronic expansion valve or a capillary tube, etc.), an evaporator, and a compressor, thereby reducing or increasing a temperature of the indoor space. The switching between the cooling mode and the heating mode is performed by switching the four-way valve. Specifically, the flow path of the refrigerant in the loop is switched by the four-way valve, so that: when the air conditioner is in a cooling mode, the indoor heat exchanger is an evaporator and the outdoor heat exchanger is a condenser, and when the air conditioner is in a heating mode, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator.
A VRF (Variable Refrigerant Flow) air conditioning system generally includes an indoor side that adjusts temperature/humidity of air of an indoor space mainly by circulation of a Refrigerant in a corresponding circuit, and a hot water side that adjusts temperature of hot water supplied to a water-using terminal mainly by circulation of a Refrigerant in a corresponding circuit. Refrigerant in the two loops is distributed, so that the VRF air conditioning system can meet the requirements of an indoor side and a hot water side at the same time. For a VRF air conditioning system, especially under the condition that the indoor side belongs to a refrigeration mode (such as summer), how to effectively recover condensed waste heat and ensure that hot water with the temperature reaching the standard is provided for the hot water side, and how to better solve the technical problem has a certain promotion space.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
Technical problem
In view of the above, the technical problem to be solved by the present invention is to provide a VRF air conditioning system, a control method thereof, and a control device thereof, which can effectively recover the condensation waste heat at the indoor side and ensure that the hot water is supplied to the hot water side at a temperature up to the standard.
Solution scheme
The invention provides a control method of a VRF air conditioning system, wherein the VRF air conditioning system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a heat storage device, a four-way valve and a throttling assembly, the heat storage device comprises a water storage container, an intermediate heat exchanger is arranged in the water storage container, the water storage container is provided with a water outlet, the throttling assembly comprises a first throttling part and a second throttling part, the compressor, the outdoor heat exchanger, the first throttling part and the indoor heat exchanger form a first refrigerant loop, and the compressor, the intermediate heat exchanger, the second throttling part and the indoor heat exchanger form a second refrigerant loop, the control method comprises the following steps: detecting the water outlet temperature at the water outlet; and the opening degree of the first throttling part and/or the second throttling part is/are adjusted according to the outlet water temperature, and under the condition that the outlet water temperature can be adjusted by adjusting the opening degrees of the first throttling part and the second throttling part, the opening degree of the second throttling part is preferentially adjusted.
With such an arrangement, the VRF air conditioning system of the present invention can satisfy the indoor air conditioning demand and supply hot water to the hot water terminal on the other hand. In addition, the second throttling part is set as the throttling part which is adjusted preferentially, so that the outlet water temperature can be adjusted more timely.
In one possible embodiment of the control method of the VRF air conditioning system, the four-way valve has C, D, E, S four sides, and when the C-D side and the E-S side of the four-way valve are in communication, the refrigerant circulates through a first refrigerant circuit formed by the compressor → the outdoor heat exchanger → the first throttling part → the indoor heat exchanger → the compressor to obtain cooling energy at the indoor side where the indoor heat exchanger is located, and when the refrigerant circulates through a second refrigerant circuit formed by the compressor → the intermediate heat exchanger → the second throttling part → the indoor heat exchanger → the compressor to enable the heat storage device to supply hot water to the hot water side at least through the water outlet port, the opening degree of the first throttling part and/or the second throttling part is adjusted according to the outlet water temperature, and when the adjustment of the outlet water temperature can be achieved by adjusting the opening degrees of the first throttling part and the second throttling part, the prioritizing of the opening degree of the second throttling part "includes: and under the condition that the outlet water temperature is higher than the required target outlet water temperature, the opening degree of the second throttling part is reduced.
By preferentially reducing the opening degree of the second throttling member, the circulating refrigerant participating in the second refrigerant circuit can be reduced for the first time, and the rising speed of the outlet water temperature can be suppressed.
With regard to the control method of the VRF air conditioning system, in one possible embodiment, the "reducing the opening degree of the second throttling part in the case that the outlet water temperature is higher than the required target outlet water temperature" includes: the opening degree of the first throttling part is increased at the same time as or after the opening degree of the second throttling part is decreased.
Through the mode of jointly adjusting the first throttling component and the second throttling component, on one hand, the rising speed of the outlet water temperature can be restrained, on the other hand, the total amount of refrigerants in the two refrigerant loops can be adjusted through the redistribution of the refrigerants, and therefore the refrigerating effect of the indoor side can be guaranteed.
With regard to the control method of the above-described VRF air conditioning system, in one possible embodiment, the "increasing the opening degree of the first throttling part while or after decreasing the opening degree of the second throttling part" includes: the amount of increase in the opening degree of the first throttling element is greater than the amount of decrease in the opening degree of the second throttling element during at least a portion of the adjusting.
Through the arrangement, on one hand, the hot water temperature provided to the external user terminal is ensured not to be too high. However, in this process, the cooling effect on the indoor side is enhanced to some extent.
The reason why such a processing method is adopted is that: compared with thermal shock, the increase of cold quantity caused by the increase of refrigerant circulation quantity in the refrigeration mode has relatively small influence on the body feeling of users at the indoor side, so that the rising speed of the outlet water temperature can be restrained more quickly by the arrangement.
With regard to the control method of the above VRF air conditioning system, in one possible embodiment, the "the amount of increase in the opening degree of the first throttling element is greater than the amount of decrease in the opening degree of the second throttling element during at least a portion of the adjusting" includes: under the condition that the outlet water temperature is higher than a first set temperature, the opening degree of the second throttling part is reduced, and the opening degree of the first throttling part is increased to the maximum; and the first set temperature is greater than the required target outlet water temperature.
With such an arrangement, when the outlet water temperature is too high, the outlet water temperature can be quickly adjusted. If the desired target outlet water temperature is assumed to be 55 c, the first set point temperature may be a value between 75-85 c (e.g., 75 c).
After that, the rising speed of the outlet water temperature gradually decreases, and the outlet water temperature finally decreases along with the water usage (taking hot water) of the water usage terminal and the water supplement (adding cold water) of the external water source, for example, in the case that the outlet water temperature is less than or equal to the first set temperature (but still greater than the required target outlet water temperature), the opening degree of the first throttling component can be appropriately reduced to simultaneously meet the requirements of both the hot water quality of the water usage terminal on the hot water side and the indoor side refrigeration effect. It can be understood that, at this time, the rising speed of the leaving water temperature still has to be ensured to be in a descending trend, so that the opening degree of the second throttling part still needs to be smaller than the original opening degree before adjustment, and the opening degree of the first throttling part still needs to be larger than the original opening degree before adjustment.
By dividing the adjustment process into two or more stages with a slow and a fast phase, e.g. by dividing the adjustment to the first throttle element into a first, large amplitude adjustment followed by a small amplitude adjustment. The adjustment for the reduction of the opening degree of the second throttling element may be divided into different stages, for example, the opening degree is reduced as a whole relative to the opening degree before adjustment, but the degree of reduction may be varied. If the leaving water temperature is less than or equal to the first set temperature, the water temperature is not too high, and therefore the refrigerant distribution needs to be shared by the second refrigerant circuit more than needed on the premise that the leaving water temperature is still required to be reduced continuously. However, since the opening degree of the second throttling element is already reduced in the case that the outlet water temperature is higher than the first set temperature, at this stage, the actual outlet water temperature reduction schedule, the hot water demand of the water use terminal, the water temperature of the water supplement and other factors can be referred to, and the opening degree of the second throttling element can be selected to be continuously reduced or kept basically unchanged at the end of the first stage.
With regard to the control method of the above-described VRF air conditioning system, in one possible embodiment, after the step of "reducing the opening degree of the second throttling part in the case where the outlet water temperature is greater than the required target outlet water temperature", the control method includes: under the condition that the outlet water temperature is lower than a second set temperature, reducing the opening degree of the first throttling part to a reference opening degree and increasing the opening degree of the second throttling part to the maximum; carrying out PID (proportion integration differentiation) adjustment on the opening degrees of the first throttling component and the second throttling component according to the outlet water temperature; wherein the second set temperature is less than the desired target outlet water temperature.
By such an arrangement, an initial state of PID regulation after the outlet water temperature is regulated to be not over-temperature is given. The VRF air conditioning system can adjust the temperature of the air in the room and the temperature of the hot water required by the hot water terminals based on the PID control. The reference opening degree is a low value at which the opening degree set for the VRF air conditioning system is small.
In a possible embodiment, a water mixing valve is arranged between the water outlet of the water storage device and the water terminal, and the water mixing valve is also communicated with an external water source.
Through the arrangement, the external water source and the hot water in the water storage device are mixed (primarily cooled) at the water mixing valve and then are supplied to the water using terminal, and under the condition that the outlet water temperature is the same, the temperature of the hot water supplied to the water using terminal can be changed through the position adjustment of the water mixing valve.
With the control method of the VRF air conditioning system described above, in one possible embodiment, the thermal storage device further includes a solar thermal storage module to provide hot water to the hot water side by heat obtained from the intermediate heat exchanger and/or the solar thermal storage module.
Through the arrangement, hot water with the temperature reaching the standard can be obtained on the hot water side in an active heat supplementing mode.
A second aspect of the invention provides a VRF air conditioning system comprising a control module, wherein the control module is configured to execute the control method of the VRF air conditioner of any one of the preceding claims.
It can be understood that the VRF air conditioning system has all the technical effects of the aforementioned control method of the VRF air conditioning system, and will not be described herein again.
A third aspect of the present invention provides a control apparatus comprising a memory and a processor, wherein the memory stores a program capable of executing the control method of the VRF air conditioning system according to any one of the preceding claims, and wherein the processor is capable of calling the program and executing the control method of the VRF air conditioning system according to any one of the preceding claims.
It can be understood that the control device has all the technical effects of the control method of the VRF air conditioning system, and the details are not repeated herein.
Drawings
The invention is described below with reference to the accompanying drawings. In the drawings:
FIG. 1 shows a schematic structural diagram of a VRF air conditioning system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic view showing the construction of a heat storage device in a VRF air conditioning system according to an embodiment of the present invention;
FIG. 3 is a first flowchart illustrating a control method of a VRF air conditioning system according to an embodiment of the present invention;
FIG. 4 is a second flowchart illustrating a control method of a VRF air conditioning system in accordance with an embodiment of the present invention;
FIG. 5 is a third flowchart illustrating a control method of a VRF air conditioning system in accordance with an embodiment of the present invention; and
fig. 6 is a flowchart illustrating a fourth control method of the VRF air conditioning system according to an embodiment of the present invention.
List of reference numerals:
1. a compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. an indoor heat exchanger; 51. an electronic expansion valve PMV-C; 52. an electronic expansion valve PMV-Q; 6. a gas-liquid separator; 7. an oil return; 8. a heat storage device; 81. a water storage container; 811. a water outlet; 812. a water inlet; 82. an intermediate heat exchanger; 83. a solar thermal storage module; 9. a water mixing valve; 10. and (5) using water for termination.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 and 2, fig. 1 shows a schematic configuration diagram of a VRF air conditioning system according to an embodiment of the present invention, and fig. 2 shows a schematic configuration diagram of a heat storage device in the VRF air conditioning system according to an embodiment of the present invention. As shown in fig. 1 and 2, the VRF air conditioning system mainly includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an indoor heat exchanger 4, a throttle assembly, and a heat storage device 8, and the heat storage device 8 includes a heat storage module and a water storage container 81. As exemplified, the thermal storage device 8 includes a case provided with a thermal storage module at a lower side and a water storage container 81 at an upper side, the thermal storage module being a solar thermal storage module 83. The water storage container 81 is internally provided with an intermediate heat exchanger 82, the four-way valve 2 has C, D, E, S four sides, and the throttling assembly comprises a first throttling component and a second throttling component, in this embodiment, the first throttling component and the second throttling component are both electronic expansion valves, wherein the first throttling component is an electronic expansion valve PMV-C51 (hereinafter referred to as PMV-C), and the second throttling component is an electronic expansion valve PMV-Q52 (hereinafter referred to as PMV-Q).
Wherein, the structure of hot water side mainly is:
the water storage container 81 has a water outlet 811 and a water inlet 812, and an external water source (tap water) may supply water to the water terminal 10 through the water outlet 811 and may supply water into the water storage container 81 through the water inlet 812. Specifically, the method comprises the following steps: the hot water in the water storage container 81 flows out through the water outlet 811, is mixed with the cold water supplied from the external water source, and is then supplied to the hot water terminal 10. In order to more flexibly adjust the temperature of the hot water obtained by the water terminal 10, a mixing valve 9 for adjusting the mixing ratio is provided at the mixing place.
Based on the above-described structure of the hot water side, the adjustment of the temperature of the hot water of the water use terminal 10 can be theoretically achieved by three ways of "the position of the mixing valve 9 is constant, only by adjusting the temperature standard of the water outlet", "the temperature standard of the water outlet is constant, only by adjusting the position of the mixing valve 9", and "the temperature standard of the water outlet and the position of the mixing valve 9 are jointly adjusted". However, since the mixing valve is fixed in position, the mixing valve is of little significance, and the two latter adjustment schemes are generally adopted.
Wherein, the indoor side's structure mainly is:
the side C of the four-way valve 2 is respectively connected with the first side of the outdoor heat exchanger 3 and the first side of the intermediate heat exchanger 82, the second side of the outdoor heat exchanger 3 is connected with the first side of the indoor heat exchanger 4, the PMV-C is arranged on a pipeline between the first side and the intermediate heat exchanger, the second side of the intermediate heat exchanger 82 is connected with the first side of the indoor heat exchanger 4, the PMV-Q is arranged on a pipeline between the first side and the intermediate heat exchanger, the second side of the indoor heat exchanger 4 is connected with the side E of the four-way valve 2, the side S of the four-way valve 2 is connected with the air return port of the compressor 1, the air-liquid separator 6 is arranged between the first side and the second side.
Based on the indoor configuration, the operation of the VRF air conditioning system will be described by taking as an example that the adjustment of the temperature of the hot water in the hot water side water use terminal 10 is obtained by "the temperature standard of the water outlet is constant, and only the position of the mixing valve 9 is adjusted".
When the VRF air conditioning system is in a cooling mode, the C-D side and the E-S side of the four-way valve 2 are communicated, the compressor 1 → the outdoor heat exchanger 3 → the PMV-C → the indoor heat exchanger 4 → the compressor 1 forms a first refrigerant loop, so that the indoor side where the indoor heat exchanger 4 is located obtains cooling energy, and the compressor 1 → the intermediate heat exchanger 82 → the PMV-Q → the indoor heat exchanger 4 → the compressor 1 forms a second refrigerant loop, so that the heat storage device 8 can provide hot water to a user terminal through a water outlet.
When the VRF air conditioning system is in the cooling mode, the high-temperature and high-pressure refrigerant carries the waste heat transferred from the indoor side to perform heat recovery, thereby supplying hot water (e.g., domestic hot water) to the hot water side water terminals 10. Given the capabilities of the thermal storage device itself and the experience of the water terminals, it is common to define a reasonable temperature for the hot water in the water storage tank 81, herein denoted as the desired target outlet water temperature.
The VRF air conditioning system comprises a control module, wherein a temperature sensor is arranged at a water outlet of a water storage container 81, and the temperature sensor is used for detecting the water outlet temperature of the water storage container 81 and transmitting the detected water outlet temperature to the control module. The control module is used for executing the following control method so as to enable the hot water at the water outlet of the water storage container to fall back as soon as possible when the hot water deviates from the required target outlet water temperature.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the control module is configured only to illustrate the functional units of the system of the present invention, the physical device corresponding to the control module may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of control modules is only exemplary.
Those skilled in the art will appreciate that the control module may be adaptively split. The specific splitting of the control module does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after the splitting will fall into the protection scope of the present invention.
Referring to fig. 3, fig. 3 is a first flowchart illustrating a control method of a VRF air conditioning system according to an embodiment of the present invention. As shown in fig. 3, the control method of the VRF air conditioning system includes the steps of:
when the VRF air conditioning system is in a refrigeration mode, acquiring the water outlet temperature of a water outlet 811 of a water storage container detected by a temperature sensor;
and adjusting the opening degree of the PMV-C and/or the PMV-Q according to the outlet water temperature, and preferentially adjusting the opening degree of the PMV-Q under the condition that the outlet water temperature can be adjusted by adjusting the opening degrees of the PMV-C and the PMV-Q.
When the VRF air conditioning system meets the air conditioning requirement of the indoor side and the hot water conditioning requirement of the hot water side, the PMV-Q is set as the throttling component which is adjusted preferentially, and when a coping strategy of refrigerant adjustment is given for temperature adjustment, the adjustment of the outlet water temperature can be realized more timely.
Referring to fig. 4, fig. 4 is a flowchart illustrating a second method for controlling the VRF air conditioning system according to an embodiment of the present invention. As shown in fig. 4, in one possible embodiment, the control method of the VRF air conditioning system further includes the steps of:
when the VRF air conditioning system is in a refrigeration mode, acquiring the water outlet temperature of a water outlet 811 of a water storage container detected by a temperature sensor;
and preferentially reducing the opening degree of the PMV-Q under the condition that the outlet water temperature is higher than the required target outlet water temperature. In order to secure the temperature of the air inside the room, the opening degree of the PMV-C is increased while or after the opening degree of the PMV-Q is decreased. As in a preferred embodiment, after the opening of PMV-Q is decreased by 10-20s, the opening of PMV-C is increased. The PMV-Q advanced coping strategy can enable the regulation of the outlet water temperature to be fed back at the first time.
In order to ensure a rapid implementation of the temperature regulation for the step of "increasing the opening of the PMV-C at the same time as or after decreasing the opening of the PMV-Q", in a possible embodiment, the increase of the opening of the PMV-C is greater than the decrease of the opening of the PMV-Q during at least a part of the regulation. As in a preferred embodiment, the opening of PMV-C is increased by an amount not less than 10p greater than the decrease in opening of PMV-Q. The coping strategy of reserving the transient preferential regulation space for the hot water side can enable the outlet water temperature to be regulated more effectively.
However, since the control logic of "the increase amount of the opening degree of the PMV-C is greater than the decrease amount of the opening degree of the PMV-Q" takes the starting point to additionally apply the cooling amount for the leaving water temperature, the state in which the increase amount of the opening degree of the PMV-C is greater than the decrease amount of the opening degree of the PMV-Q cannot last too long in consideration of the experience of the indoor side, such as the state in which the increase amount of the opening degree of the PMV-C is greater than the decrease amount of the opening degree of the PMV-Q should last for no more than 3min in general.
Referring to fig. 5, fig. 5 is a third flowchart illustrating a control method of a VRF air conditioning system according to an embodiment of the present invention. In one possible embodiment, as shown in fig. 5, the step of "increasing the opening degree of the PMV-C while or after decreasing the opening degree of the PMV-Q" further comprises:
assuming that the required target outlet water temperature is 55 ℃, the state that the outlet water temperature is higher than the required target outlet water temperature is divided into two stages, wherein the first stage is a stage that the outlet water temperature is higher than a first set temperature (for example, the first set temperature is 75 ℃), and the second stage is a stage that the outlet water temperature is higher than or equal to the required target outlet water temperature and is lower than or equal to the first set temperature.
In the first stage, the control method of the VRF air conditioning system includes: closing the opening degree of the PMV-Q to a standby reference opening degree (such as 24p), and simultaneously increasing the opening degree of the PMV-C to be fully opened;
in the second stage, the control method of the VRF air conditioning system includes: the opening of the PMV-Q is appropriately opened, for example, by 5-10p, while the opening of the PMV-C is appropriately closed, for example, after continuously keeping the opening of the PMV-C at the full opening for 10s, the opening of the PMV-C is correspondingly closed by 5-10 p. And then, performing PID (proportion integration differentiation) adjustment on the PMV-C and the PMV-Q according to the difference value of the outlet water temperature and the required target outlet water temperature so as to ensure the overall performance of the VRF air conditioning system.
Referring to fig. 6, fig. 6 is a fourth flowchart illustrating a control method of the VRF air conditioning system according to an embodiment of the present invention. As shown in fig. 6, the control method of the VRF air conditioning system further includes the steps of:
when the VRF air conditioning system is in a refrigeration mode, acquiring the water outlet temperature of a water outlet 811 of a water storage container detected by a temperature sensor;
under the condition that the outlet water temperature is lower than the required target outlet water temperature (for example, the outlet water temperature can be directly compared with the required target outlet water temperature, or the outlet water temperature is compared with a certain set temperature lower than the required target outlet water temperature), firstly, the opening degree of the PMV-Q is increased to be fully opened and the PMV-C is reduced to be a standby reference opening degree (for example, 24 pls);
and then, with the state as a starting point, carrying out PID (proportion integration differentiation) adjustment on the opening degrees of the PMV-C and the PMV-Q according to the difference value between the outlet water temperature and the required target outlet water temperature so as to ensure the overall performance of the VRF air conditioning system.
The control method is carried out to ensure that the outlet water temperature can reach the standard when the VRF air conditioning system is in the refrigeration mode.
When the VRF air conditioning system is in a heating mode, the D-E side and the C-S side of the four-way valve 2 are communicated, the compressor 1 → the indoor heat exchanger 4 → PMV-C → the outdoor heat exchanger 3 → the compressor 1 forms a first refrigerant loop, so that the indoor side where the indoor heat exchanger 4 is located obtains heat, the compressor 1 → the indoor heat exchanger 4 → PMV-Q → the intermediate heat exchanger 82 → the compressor 1 forms a second refrigerant loop, and at the moment, the heat storage device 8 provides hot water to a water terminal on the hot water side through a water outlet and the heat stored in the heat storage device 8. Meanwhile, the second refrigerant circuit can absorb the heat of the heat storage device 8 to perform forced heat exchange while inputting a low-pressure low-temperature refrigerant to the intermediate heat exchanger 82 of the heat storage device 8, so that the temperature and the pressure of the refrigerant at the suction port of the compressor 1 are increased, and thus, the indoor heat exchanger 4 can obtain more heat by increasing the refrigerant circulation amount of the compressor 1 in the circuit.
In this case, the opening degree of the PMV-Q may be controlled according to the temperature difference between the refrigerant inlet and the refrigerant outlet of the intermediate heat exchanger, for example, when the difference is greater than a certain threshold (e.g., 1 ℃), the opening degree of the PMV-Q is increased, that is, the indoor heat exchanger 4 obtains more heat through the circulation amount of the refrigerant. And when the difference is smaller than the threshold value, the effect of forced heat exchange is not obvious, and at the moment, the PMV-Q can be properly reduced or even closed. The specific manner of increasing or decreasing the opening degree of the PMV-Q may be PID-controlled according to the specific difference. In the cooling mode, the heat for supplying hot water to the outside mainly comes from the heat storage device 8, and in order to prevent the basic demand of the hot water side water use terminal 10 from being affected, under the condition that the temperature at the water outlet is lower than 25 ℃, whether the difference value is larger than the threshold value or not, the PMV-Q is selected to be closed, and the active temperature compensation is carried out by opening the reserved heat supply measures such as auxiliary electric heating and the like, so as to ensure the basic demand of the hot water side water use terminal 10.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art may understand that, in order to achieve the effect of the present invention, different steps do not have to be executed in such a sequence, and may be executed simultaneously (in parallel) or in other sequences, or some steps may be omitted, and these changes are within the protection scope of the present invention.
It should be noted that, although the above-described specific control method is described as an example, those skilled in the art will appreciate that the present invention should not be limited thereto. In fact, the user can flexibly adjust the relevant steps, parameters in the steps and other elements according to the situations such as actual application scenes and the like.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of a VRF air conditioning system is characterized in that the VRF air conditioning system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a heat storage device, a four-way valve and a throttling component,
the heat storage device comprises a water storage container, an intermediate heat exchanger is arranged in the water storage container, the water storage container is provided with a water outlet,
the throttle assembly includes a first throttle member and a second throttle member,
the compressor, the outdoor heat exchanger, the first throttling component and the indoor heat exchanger form a first refrigerant loop,
the compressor, the intermediate heat exchanger, the second throttling part and the indoor heat exchanger form a second refrigerant loop,
the control method comprises the following steps:
detecting the water outlet temperature at the water outlet;
the opening degree of the first throttling component and/or the second throttling component is adjusted according to the outlet water temperature, and
under the condition that the outlet water temperature can be adjusted by adjusting the opening degree of the first throttling part and the second throttling part, the opening degree of the second throttling part is preferentially adjusted.
2. The control method of claim 1, wherein the four-way valve has C, D, E, S four sides,
in the case of C-D side communication and E-S side communication of the four-way valve, the indoor side where the indoor heat exchanger is located obtains cooling energy by the circulation of the refrigerant in the first refrigerant circuit consisting of the compressor → the outdoor heat exchanger → the first throttling part → the indoor heat exchanger → the compressor,
the heat storage device can supply hot water to the hot water side through at least the water outlet by the circulation of the refrigerant in the second refrigerant circuit constituted by the compressor → the intermediate heat exchanger → the second throttle member → the indoor heat exchanger → the compressor,
the step of preferentially adjusting the opening degree of the second throttling component under the condition that the opening degrees of the first throttling component and/or the second throttling component are/is adjusted according to the outlet water temperature comprises the following steps:
and under the condition that the outlet water temperature is higher than the required target outlet water temperature, the opening degree of the second throttling part is reduced.
3. The control method according to claim 2, wherein the reducing the opening degree of the second throttling part in the case that the outlet water temperature is higher than the required target outlet water temperature comprises:
the opening degree of the first throttling part is increased at the same time as or after the opening degree of the second throttling part is decreased.
4. The control method according to claim 3, wherein the "increasing the opening degree of the first throttle member while or after decreasing the opening degree of the second throttle member" comprises:
the amount of increase in the opening degree of the first throttling element is greater than the amount of decrease in the opening degree of the second throttling element during at least a portion of the adjusting.
5. The control method of claim 4, wherein said "an amount of increase in the opening degree of the first throttling element is greater than an amount of decrease in the opening degree of the second throttling element during at least a portion of the adjusting" comprises:
under the condition that the outlet water temperature is higher than a first set temperature, the opening degree of the second throttling part is reduced, and the opening degree of the first throttling part is increased to the maximum;
and the first set temperature is greater than the required target outlet water temperature.
6. The control method according to claim 2, characterized in that after the step of "reducing the opening degree of the second throttling part in the case where the leaving water temperature is greater than the required target leaving water temperature", the control method comprises:
under the condition that the outlet water temperature is lower than a second set temperature, reducing the opening degree of the first throttling part to a reference opening degree and increasing the opening degree of the second throttling part to the maximum;
carrying out PID (proportion integration differentiation) adjustment on the opening degrees of the first throttling component and the second throttling component according to the outlet water temperature;
wherein the second set temperature is less than the desired target outlet water temperature.
7. The control method according to any one of claims 1 to 6, wherein a water mixing valve is arranged between the water outlet of the water storage device and the water using terminal, and the water mixing valve is also communicated with an external water source.
8. The control method according to any one of claims 1 to 6, wherein the heat storage device further includes a solar heat storage module so as to supply hot water to a hot water side by heat taken from an intermediate heat exchanger and/or the solar heat storage module.
9. A VRF air conditioning system, comprising a control module capable of performing the control method of the VRF air conditioning system of any one of claims 1 to 8.
10. A control device, comprising a memory and a processor,
wherein the memory is for storing a computer program;
wherein the processor is capable of calling the program and executing the control method of the VRF air conditioning system of any of claims 1 to 8.
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| CN202010565765.5A CN111878961A (en) | 2020-06-19 | 2020-06-19 | VRF air conditioning system and control method and control device thereof |
| PCT/CN2021/089752 WO2021223612A1 (en) | 2020-06-19 | 2021-04-26 | Vrf air-conditioning system and control method therefor, and control device |
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| WO2021223612A1 (en) * | 2020-06-19 | 2021-11-11 | 青岛海尔空调电子有限公司 | Vrf air-conditioning system and control method therefor, and control device |
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| CN114992705B (en) * | 2022-05-27 | 2024-02-23 | 青岛海尔空调电子有限公司 | Method and device for regulating a heating system, control device and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202770049U (en) * | 2012-05-30 | 2013-03-06 | 青岛海之新能源有限公司 | Hot water air conditioner |
| CN110307614A (en) * | 2019-08-02 | 2019-10-08 | 珠海格力电器股份有限公司 | A kind of air conditioner and its control method integrating air-conditioning and water chiller/heater |
| CN210179818U (en) * | 2019-08-02 | 2020-03-24 | 珠海格力电器股份有限公司 | Air conditioner integrating air conditioner and cold and hot water machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001248937A (en) * | 2000-03-08 | 2001-09-14 | Toshiba Kyaria Kk | Heat pump hot water supply air conditioner |
| CN101738032B (en) * | 2009-11-26 | 2012-08-22 | 李声铨 | Improved air-conditioning water heater |
| CN201607075U (en) * | 2009-11-26 | 2010-10-13 | 李声铨 | Improved air-conditioning water heater |
| CN202254480U (en) * | 2010-11-22 | 2012-05-30 | 青岛海之新能源有限公司 | Multifunctional water-heating air-conditioning system |
| CN202392923U (en) * | 2011-12-12 | 2012-08-22 | 江门市凯立信电气科技有限公司 | Air-conditioner and hot-water dual purpose device |
| CN103822398B (en) * | 2012-11-16 | 2016-03-02 | 广东美的暖通设备有限公司 | Heat pump air-conditioning hot water group |
| CN109357427B (en) * | 2018-09-27 | 2020-11-03 | 克莱门特捷联制冷设备(上海)有限公司 | Combined air conditioning system for machine room and hot water system and control method thereof |
| CN111878961A (en) * | 2020-06-19 | 2020-11-03 | 青岛海尔空调电子有限公司 | VRF air conditioning system and control method and control device thereof |
-
2020
- 2020-06-19 CN CN202010565765.5A patent/CN111878961A/en active Pending
-
2021
- 2021-04-26 WO PCT/CN2021/089752 patent/WO2021223612A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202770049U (en) * | 2012-05-30 | 2013-03-06 | 青岛海之新能源有限公司 | Hot water air conditioner |
| CN110307614A (en) * | 2019-08-02 | 2019-10-08 | 珠海格力电器股份有限公司 | A kind of air conditioner and its control method integrating air-conditioning and water chiller/heater |
| CN210179818U (en) * | 2019-08-02 | 2020-03-24 | 珠海格力电器股份有限公司 | Air conditioner integrating air conditioner and cold and hot water machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021223612A1 (en) * | 2020-06-19 | 2021-11-11 | 青岛海尔空调电子有限公司 | Vrf air-conditioning system and control method therefor, and control device |
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