CN114251858A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN114251858A CN114251858A CN202111566923.XA CN202111566923A CN114251858A CN 114251858 A CN114251858 A CN 114251858A CN 202111566923 A CN202111566923 A CN 202111566923A CN 114251858 A CN114251858 A CN 114251858A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20718—Forced ventilation of a gaseous coolant
- H05K7/20745—Forced ventilation of a gaseous coolant within rooms for removing heat from cabinets, e.g. by air conditioning device
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20836—Thermal management, e.g. server temperature control
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides an air conditioning system and a control method thereof. The air conditioning system includes: the power device, the condensing device, the liquid storage device, the throttling device and the evaporating device are connected in sequence; the power device has two operation modes of a compression mode and an air pump mode; the air conditioning system also has a gravity heat pipe mode; based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout, the air conditioning system operates in one of a compression mode, an air pump mode, and a gravity assisted heat pipe mode. The air conditioning system and the control method thereof can operate the compression mode and the air pump mode, and can also operate the gravity heat pipe mode when the operation condition of the gravity heat pipe mode is met, so that the power consumption of the system is further reduced, the energy conservation is realized, and the energy consumption is reduced.
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 cooling equipment applied to the data center needs to be continuously operated all the year round, and can directly utilize an outdoor low-temperature cold source to cool the data center in transition seasons and winter except that the cooling equipment needs to be operated to refrigerate when the outdoor temperature is higher in summer. There are various schemes using natural cooling sources, and among them, the heat pipe scheme is widely spotlighted and applied.
The prior art discloses a machine room air conditioning system with a compressor and an air pump connected in parallel, the compressor or the air pump is controlled to operate according to different outdoor temperatures, outdoor natural cold sources in day and night, transition seasons and winter can be fully utilized, operating energy consumption is greatly reduced, and energy saving and emission reduction effects are achieved.
In transition seasons and winter, the air pump is adopted to drive the compressor to operate instead of the compressor, which is a recognized energy-saving technical scheme. However, the addition of the air pump increases the cost of the cooling equipment, and the increase of the air pump necessitates an increase in the overall size of the equipment, which further increases the cost of the cooling equipment. In addition, because the compressor and the air pump are arranged in parallel, the oil return and oil balancing control of lubricating oil in the system becomes complicated, and if the control is not good, the reliability of the equipment is greatly reduced.
In addition, an apparatus employing integration of a compressor and an air pump has also been proposed for the purpose of achieving energy saving. However, this solution also has a problem that the compression mechanism can only operate in the compression mode or the air pump mode, and cannot operate in the gravity heat pipe mode when the system meets the operating conditions of the gravity heat pipe mode, that is, the power consumption cannot be further reduced, thereby saving energy.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
In view of this, the present application provides an air conditioning system and a control method thereof, which can operate a compression mode and an air pump mode, and also can operate a gravity heat pipe mode when satisfying the operation conditions of the gravity heat pipe mode, thereby further reducing the power consumption of the system, realizing energy saving, and reducing energy consumption.
According to an aspect of the present application, there is provided an air conditioning system, comprising:
the power device, the condensing device, the liquid storage device, the throttling device and the evaporating device are connected in sequence;
the power device has two operation modes of a compression mode and an air pump mode;
the air conditioning system also has a gravity heat pipe mode;
based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout, the air conditioning system operates in one of a compression mode, an air pump mode, and a gravity assisted heat pipe mode.
In some embodiments, the operating the air conditioning system in one of a compression mode, an air pump mode and a gravity assisted heat pipe mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout includes:
when Tout is higher than a first temperature threshold T1, the air conditioning system works in a compression mode;
and/or the presence of a gas in the gas,
when Tout is not higher than T1 and not lower than a second temperature threshold T2, or when Tout is lower than T2 and T2 is lower than Tin, and the difference between Tout and Tin is not greater than a predetermined temperature difference threshold, the air conditioning system operates in an air pump mode;
and/or the presence of a gas in the gas,
when Tout is less than T2 and the difference between Tout and Tin is greater than a predetermined temperature difference threshold, the air conditioning system operates in a gravity heat pipe mode.
In some embodiments, when the air conditioning system is operating in the compression mode, the power device operates in the compression mode, and the condensing device, the liquid storage device, the throttling device, and the evaporating device operate to support the compression mode;
and/or the presence of a gas in the gas,
when the air conditioning system works in an air pump mode, the power device runs in the air pump mode, the condensing device, the liquid storage device and the evaporating device run to support the air pump mode, and the throttling device is selectively opened or closed according to flow requirements;
and/or the presence of a gas in the gas,
and the two ends of the power device are connected with a first bypass mechanism in parallel, when the air conditioning system works in the gravity heat pipe mode, the power device closes and opens the first bypass mechanism, and the first bypass mechanism, the condensing device, the liquid storage device, the throttling device and the evaporating device run to realize the gravity heat pipe mode.
In some embodiments, a second bypass mechanism is connected in parallel to two ends of the throttling device, and when the air conditioning system works in the air pump mode, the second bypass mechanism is selectively opened or closed according to flow requirements; and/or when the air conditioning system works in the gravity heat pipe mode, the second bypass mechanism is opened.
In some embodiments, the first bypass mechanism is at least one of a solenoid valve, an electric flow regulating valve, and/or the second bypass mechanism is at least one of an electronic expansion valve, a solenoid valve, an electric flow regulating valve.
In some embodiments, the installation height of the condensing means is higher than the installation height of the evaporating means, and the installation height difference is higher than a predetermined value;
and/or the presence of a gas in the gas,
the power device is a compression and air pump integrated device or a device formed by connecting a compressor and an air pump in parallel;
and/or the presence of a gas in the gas,
the throttling device is an electronic expansion valve;
and/or the presence of a gas in the gas,
the air conditioning system working in one of a compression mode, an air pump mode and a gravity assisted heat pipe mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout comprises:
periodically and repeatedly detecting the indoor environment temperature Tin and/or the outdoor environment temperature Tout, and switching the air conditioning system among the compression mode, the air pump mode and the gravity heat pipe mode based on the change of the indoor environment temperature Tin and/or the outdoor environment temperature Tout.
According to still another aspect of the present application, there is provided a control method of an air conditioning system, characterized in that:
the air conditioning system comprises a power device, a condensing device, a liquid storage device, a throttling device and an evaporating device which are sequentially connected;
the power device has two operation modes of a compression mode and an air pump mode;
the air conditioning system also has a gravity heat pipe mode;
the method comprises the following steps:
and based on the indoor environment temperature Tin and/or the outdoor environment temperature Tout, the air conditioning system controls the devices to work in one of a gravity heat pipe mode, a compression mode and an air pump mode.
In some embodiments, the controlling, by the air conditioning system, each of the devices to operate in one of a gravity heat pipe mode, a compression mode and an air pump mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout includes:
when Tout is higher than a first temperature threshold T1, the air conditioning system controls each device to work in a compression mode;
and/or the presence of a gas in the gas,
when Tout is not higher than T1 and not lower than a second temperature threshold T2, or when Tout is lower than T2 and T2 is lower than Tin, and the difference value between Tout and Tin is not greater than a preset temperature difference threshold, the air conditioning system controls each device to work in an air pump mode;
and/or the presence of a gas in the gas,
when Tout is less than T2 and the difference between Tout and Tin is greater than a predetermined temperature difference threshold, the air conditioning system controls each device to work in the gravity heat pipe mode.
In some embodiments, when the air conditioning system operates in the compression mode, the power device is controlled to operate in the compression mode, and the condensing device, the liquid storage device, the throttling device and the evaporating device are controlled to operate to support the compression mode;
and/or the presence of a gas in the gas,
when the air conditioning system works in an air pump mode, controlling the power device to operate in the air pump mode, controlling the condensing device, the liquid storage device and the evaporating device to operate so as to support the air pump mode, and controlling the throttling device to be selectively opened or closed according to flow requirements;
and/or the presence of a gas in the gas,
and when the air conditioning system works in the gravity heat pipe mode, the power device is controlled to close and open the first bypass mechanism, and the first bypass mechanism, the condensing device, the liquid storage device, the throttling device and the evaporating device are controlled to operate so as to realize the gravity heat pipe mode.
In some embodiments, a second bypass mechanism is connected in parallel to two ends of the throttling device, and when the air conditioning system works in the air pump mode, the second bypass mechanism is controlled to be selectively opened or closed according to flow requirements; and/or when the air conditioning system works in the gravity heat pipe mode, controlling the second bypass mechanism to be opened.
In some embodiments, the first bypass mechanism is at least one of a solenoid valve, an electric flow regulating valve, and/or the second bypass mechanism is at least one of an electronic expansion valve, a solenoid valve, an electric flow regulating valve.
In some embodiments, the installation height of the condensing means is higher than the installation height of the evaporating means, and the installation height difference is higher than a predetermined value;
and/or the presence of a gas in the gas,
the power device is a compression and air pump integrated device or a device formed by connecting a compressor and an air pump in parallel;
and/or the presence of a gas in the gas,
the throttling device is an electronic expansion valve;
and/or the presence of a gas in the gas,
based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout, the air conditioning system controlling the devices to work in one of a gravity heat pipe mode, a compression mode and an air pump mode includes:
periodically and repeatedly detecting the indoor environment temperature Tin and/or the outdoor environment temperature Tout, and switching the air conditioning system among the compression mode, the air pump mode and the gravity heat pipe mode based on the change of the indoor environment temperature Tin and/or the outdoor environment temperature Tout.
According to the air conditioning system and the control method thereof, the compression mode and the air pump mode can be operated, the gravity heat pipe mode can be operated when the operation condition of the gravity heat pipe mode is met, the utilization rate of an outdoor natural cold source is improved, the unit cost of the air conditioning system is reduced, the structure of the system is simplified, the maintenance difficulty is reduced, the operation energy consumption is greatly reduced, and the excellent energy saving and emission reduction effects are achieved.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic diagram of an embodiment of an air conditioning system of the present application;
FIG. 2 illustrates a schematic diagram of an embodiment of an air conditioning system of the present application;
FIG. 3 illustrates a schematic diagram of an embodiment of an air conditioning system of the present application;
fig. 4 is a schematic diagram illustrating an embodiment of a control method of an air conditioning system according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the 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.
FIG. 1 shows a schematic diagram of an embodiment of an air conditioning system of the present application.
The air conditioning system is provided with a power device 11, a condensing device 12, a liquid storage device 13, a throttling device 14 and an evaporating device 15 which are connected in sequence. The air conditioning system is, for example, a refrigeration system applied to a data center.
The power device 11 has two operation modes of a compression mode and an air pump mode, and is a device integrating the compression and the air pump or a device with the compressor and the air pump connected in parallel. When the power device 11 is an integrated device of compression and air pump, it includes a compressor with two air outlets with different pressure ratios (pressure ratio of exhaust pressure of the air outlet to suction pressure of the air cylinder) on the air cylinder, and the compression mode or air pump mode can be realized by opening different air outlets. The condenser 12 converts the high-temperature, high-pressure gaseous refrigerant discharged from the power unit 11 into a liquid refrigerant. The liquid storage device 13 regulates the flow rate of the system by storing excess refrigerant in the system. The expansion device 14 controls the flow rate of the refrigerant in the system by adjusting the flow rate opening, and the pressure of the liquid refrigerant output from the expansion device 14 is reduced and output to the evaporation device 15. The evaporator 15 converts the low-temperature and low-pressure liquid refrigerant or the gas-liquid mixed refrigerant into a low-temperature and low-pressure gaseous refrigerant by absorbing external heat, and returns the low-temperature and low-pressure gaseous refrigerant to the power unit 11. The above steps are repeated in a circulating way to achieve temperature control. These devices may exist independently or may be integrated with each other, and are not described herein.
In some embodiments, the air conditioning system may also have a gravity heat pipe mode of operation. As one implementation, the installation height of the condensing device 11 may be higher than the installation height of the evaporating device 15, and the installation height difference between the two is higher than a predetermined value, so that the air conditioning system may be ensured to operate in the gravity heat pipe mode when the gravity heat pipe mode operation condition is satisfied.
In order to determine the operation mode of the air conditioning system, optionally, the indoor ambient temperature Tin and the outdoor ambient temperature Tout are detected, and the air conditioning system controls each of the devices to operate in one of the gravity heat pipe mode, the compression mode and the air pump mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout.
In some embodiments, the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout are repeatedly detected periodically, for example, after each time period of t1 operation, and the air conditioning system switches between the compression mode, the air pump mode, and the gravity heat pipe mode based on changes in the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout.
As one implementation, when Tout is higher than the first temperature threshold T1, the air conditioning system operates in the compression mode. Further, when the air conditioning system is operating in the compression mode, the power unit 11 is operating in the compression mode, and the condensing unit 12, the liquid storage unit 13, the throttling unit 14 and the evaporating unit 15 are operating to support the compression mode.
As one implementation, the air conditioning system operates in the air pump mode when Tout is not higher than T1 and not lower than the second temperature threshold T2, or when Tout is lower than T2 and T2 is lower than Tin and the indoor-outdoor temperature difference, i.e., the difference between Tout and Tin, is not greater than the predetermined temperature difference threshold. Further, when the air conditioning system operates in the air pump mode, the power unit 11 operates in the air pump mode, the condensing unit 12, the liquid storage unit 13 and the evaporating unit 15 operate to support the air pump mode, and the throttling unit 14 is selectively turned on or off according to flow requirements.
Further, the throttle device 14 may be in various forms such as an electronic expansion valve or a capillary tube, and the flow opening of the throttle device 14 may be adjusted according to the flow rate required by the system. However, in some cases, even if the throttle device 14 adjusts the opening degree to the maximum, the superheat requirement (i.e., the flow requirement) of the system may not be met, and a bypass mechanism with a larger drift diameter needs to be opened for normal operation. Optionally, a bypass mechanism is connected in parallel to two ends of the throttling device, and when the air conditioning system works in the air pump mode, the bypass mechanism can be selectively opened or closed according to the flow demand. When the throttle 14 is closed and the bypass mechanism is open, refrigerant can flow directly through the bypass mechanism. When the throttling device 14 and the bypass mechanism are both open, the refrigerant can pass through both simultaneously to perform a flow dividing function.
As one implementation, when Tout is less than T2 and the indoor-outdoor temperature difference, i.e., the difference between Tout and Tin, is greater than a predetermined temperature difference threshold, the air conditioning system operates in the gravity heat pipe mode. Further, when the air conditioning system is operating in the gravity heat pipe mode, the power plant 11 is turned off. Alternatively, a bypass mechanism may be connected in parallel at both ends of the power plant, such that the refrigerant flows directly from the bypass mechanism without flowing through the power plant. The high pressure refrigerant remaining in the power plant 11 circulates through the bypass mechanism and the condensing means 12, the liquid storage means 13, the throttling means 14 and the evaporating means 15 to achieve the gravity heat pipe mode.
Further, in the gravity heat pipe mode, the natural gravity and the latent heat of phase change of the refrigerant are utilized to complete the operation and refrigeration of the system flow path, so that the gravity heat pipe mode does not need throttling, and thus, when the gravity heat pipe mode is operated, the throttling device 14 and the bypass mechanisms at the two ends of the throttling device can be simultaneously opened, so that the refrigerant is completely or partially circulated through the bypass mechanisms, and optionally, in the gravity heat pipe mode, the flow opening degree of the throttling device 14 can be opened to the maximum, so that the throttling device is not completely short-circuited, and a certain flow is shared.
FIG. 2 shows a schematic diagram of an embodiment of an air conditioning system of the present application.
There are two differences from the air conditioning system of fig. 1:
first, the first bypass mechanism 16 is connected in parallel to both ends of the power plant 11, so that the refrigerant can directly flow through the first bypass mechanism 16 when the power plant 11 is closed. For example, when the system meets the gravity heat pipe mode operating conditions, the power plant 11 may be turned off so that refrigerant circulates through the first bypass mechanism 16 and the rest of the devices in the system to operate in the gravity heat pipe mode. The first bypass mechanism 16 is, for example, a solenoid valve, but is not limited thereto.
Secondly, the second bypass mechanism 17 is connected in parallel at two ends of the throttling device 14, and the second bypass mechanism 17 and the throttling device 14 can be controlled to be opened or closed according to the requirement of the system flow, so that the refrigerant can be bypassed from the throttling device 14 to the second bypass mechanism 17 or the refrigerant can be divided between the second bypass mechanism 17 and the throttling device 14 when the requirement is met.
As one implementation, the first bypass mechanism is at least one of a solenoid valve, an electric flow control valve, and the like, and/or the second bypass mechanism is at least one of an electronic expansion valve, a solenoid valve, an electric flow control valve, and the like, as long as the flow bypass function can be performed, but is not limited thereto.
In the implementation mode, when the air conditioning system operates in the gravity heat pipe mode, the condensed working medium flows back to the evaporation section under the action of gravity. Specifically, after the power device 11 is stopped, the remaining high-pressure refrigerant enters the lower inlet of the evaporation device 15 through the throttling device 14, the refrigerant in the evaporation device 15 continues to evaporate under the heating of the external air and flows out of the outlet, the refrigerant returns to the higher inlet of the condensation device 12 after bypassing the power device 11 through the first bypass mechanism 16, the refrigerant vapor entering the condensation device 12 is liquefied into liquid under the cooling of the external cold air, the liquid flows downwards under the action of gravity, the liquid flows out of the outlet and enters the lower inlet of the evaporation device 15 again, and a complete gravity heat pipe working cycle is formed.
FIG. 3 shows a schematic diagram of an embodiment of an air conditioning system of the present application.
In contrast to the air conditioning system of fig. 1, an implementation of the power plant 11 is shown: the compressor and the air pump are connected in parallel.
As shown, 111-compressor, 112-air pump, 181, 182-shutoff valves open and close the respective shutoff valves when the power plant 11 is operating in different operating modes. For example, when the compression mode is operated, the stop valve 181 is opened and the stop valve 182 is closed, so that the compressor 111 is operated and the air pump 112 is not operated; otherwise, the reverse is true. Furthermore, when it is not necessary to operate the power unit 11, all the cut-off valves 181 and 182 are closed.
Fig. 4 is a schematic diagram illustrating an embodiment of a control method of an air conditioning system according to the present application.
Taking the air conditioning system of fig. 2 as an example, fig. 4 illustrates a corresponding control method.
And step S1, starting the unit of the air conditioning system.
And step S2, detecting the indoor environment temperature Tin and the outdoor environment temperature Tout, so that the air conditioning system controls each device to work in one of a compression mode, an air pump mode and a gravity heat pipe mode based on the indoor environment temperature Tin and/or the outdoor environment temperature Tout. The temperature detection can be carried out here by a temperature sensor of the air conditioning system or by a separate temperature sensor.
In step S3, it is determined whether Tout is higher than the first temperature threshold T1 (i.e., Tout > T1).
In step S4, it is determined whether Tout is not higher than the first temperature threshold T1 and not lower than the second temperature threshold T2 (i.e., T1> -Tout > -T2), or Tout is lower than T2 and the indoor and outdoor temperature difference is not higher than a predetermined temperature difference threshold Δ T (i.e., (Tout < T2) & (Tin-Tout < Δt)).
In step S5, whether Tout is less than T2 and the indoor and outdoor temperature difference is greater than a predetermined temperature difference threshold value DeltaT (i.e., Tout < T2& Tin-Tout > DeltaT).
The first temperature threshold T1, the second temperature threshold T2, and the predetermined temperature difference threshold Δ T may be set empirically, or may be learned through other methods such as statistics or artificial intelligence.
When the judgment result of the step S3 is yes, steps S31 and S32 are performed. When the judgment result of the step S3 is NO, the step S4 is executed.
In step S31, the first bypass mechanism 16 and the second bypass mechanism 17 are closed, and the throttle device 14 is opened.
In step S32, the power plant 11 operates the compression mode.
When the judgment result of the step S4 is yes, steps S41, S42 and S43 are performed. When the judgment result of the step S4 is NO, the step S5 is executed.
In step S41, the first bypass mechanism 16 is closed.
In step S42, the throttle device 14 and the second bypass mechanism 17 are opened as needed.
In step S43, the power unit 11 operates the air pump mode.
When the judgment result of the step S5 is yes, steps S51 and S52 are performed.
Step S51, the power unit 11 is turned off, and the air conditioning system operates in the gravity heat pipe mode.
In step S52, the first bypass mechanism 16, the second bypass mechanism 17, and the throttle device 14 are turned on to implement the gravity heat pipe mode.
In step S6, the current operation mode is operated for a time period t1, and the process returns to step S2 again, and then the maintenance or switching of the current operation mode is performed according to the detected temperature.
The air conditioning system can switch the compression mode, the air pump circulation mode and the gravity heat pipe mode, is particularly used for an outdoor data center, improves the utilization rate of outdoor natural cold sources in day and night, transition seasons and winter, reduces the unit cost of the air conditioning system, simplifies the structure of the system, reduces the maintenance difficulty, greatly reduces the operation energy consumption, and has excellent energy saving and emission reduction effects.
Since the processes and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments for details that are not described in the present embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (12)
1. An air conditioning system, comprising:
the power device, the condensing device, the liquid storage device, the throttling device and the evaporating device are connected in sequence;
the power device has two operation modes of a compression mode and an air pump mode;
the air conditioning system also has a gravity heat pipe mode;
based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout, the air conditioning system operates in one of a compression mode, an air pump mode, and a gravity assisted heat pipe mode.
2. The air conditioning system of claim 1, wherein the air conditioning system operating in one of a compression mode, an air pump mode, and a gravity heat pipe mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout comprises:
when Tout is higher than a first temperature threshold T1, the air conditioning system works in a compression mode;
and/or the presence of a gas in the gas,
when Tout is not higher than T1 and not lower than a second temperature threshold T2, or when Tout is lower than T2 and T2 is lower than Tin, and the difference between Tout and Tin is not greater than a predetermined temperature difference threshold, the air conditioning system operates in an air pump mode;
and/or the presence of a gas in the gas,
when Tout is less than T2 and the difference between Tout and Tin is greater than a predetermined temperature difference threshold, the air conditioning system operates in a gravity heat pipe mode.
3. The air conditioning system according to claim 1 or 2, characterized in that:
when the air conditioning system works in the compression mode, the power device operates in the compression mode, and the condensing device, the liquid storage device, the throttling device and the evaporating device operate to support the compression mode;
and/or the presence of a gas in the gas,
when the air conditioning system works in an air pump mode, the power device runs in the air pump mode, the condensing device, the liquid storage device and the evaporating device run to support the air pump mode, and the throttling device is selectively opened or closed according to flow requirements;
and/or the presence of a gas in the gas,
and the two ends of the power device are connected with a first bypass mechanism in parallel, when the air conditioning system works in the gravity heat pipe mode, the power device closes and opens the first bypass mechanism, and the first bypass mechanism, the condensing device, the liquid storage device, the throttling device and the evaporating device run to realize the gravity heat pipe mode.
4. The air conditioning system of claim 3, wherein:
two ends of the throttling device are connected with a second bypass mechanism in parallel,
when the air conditioning system works in the air pump mode, the second bypass mechanism is selectively opened or closed according to the flow requirement; and/or when the air conditioning system works in the gravity heat pipe mode, the second bypass mechanism is opened.
5. The air conditioning system of claim 4, wherein:
the first bypass mechanism is at least one of an electromagnetic valve and an electric flow regulating valve, and/or the second bypass mechanism is at least one of an electronic expansion valve, an electromagnetic valve and an electric flow regulating valve.
6. The air conditioning system of claim 1,
the installation height of the condensing device is higher than that of the evaporating device, and the installation height difference is higher than a preset value;
and/or the presence of a gas in the gas,
the power device is a compression and air pump integrated device or a device formed by connecting a compressor and an air pump in parallel;
and/or the presence of a gas in the gas,
the throttling device is an electronic expansion valve;
and/or the presence of a gas in the gas,
the air conditioning system working in one of a compression mode, an air pump mode and a gravity assisted heat pipe mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout comprises:
periodically and repeatedly detecting the indoor environment temperature Tin and/or the outdoor environment temperature Tout, and switching the air conditioning system among the compression mode, the air pump mode and the gravity heat pipe mode based on the change of the indoor environment temperature Tin and/or the outdoor environment temperature Tout.
7. A control method of an air conditioning system is characterized in that,
the air conditioning system comprises a power device, a condensing device, a liquid storage device, a throttling device and an evaporating device which are sequentially connected;
the power device has two operation modes of a compression mode and an air pump mode;
the air conditioning system also has a gravity heat pipe mode;
the method comprises the following steps:
and based on the indoor environment temperature Tin and/or the outdoor environment temperature Tout, the air conditioning system controls the devices to work in one of a gravity heat pipe mode, a compression mode and an air pump mode.
8. The method as claimed in claim 7, wherein the controlling the air conditioning system to operate in one of the gravity assisted heat pipe mode, the compression mode and the air pump mode based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout comprises:
when Tout is higher than a first temperature threshold T1, the air conditioning system controls each device to work in a compression mode;
and/or the presence of a gas in the gas,
when Tout is not higher than T1 and not lower than a second temperature threshold T2, or when Tout is lower than T2 and T2 is lower than Tin, and the difference value between Tout and Tin is not greater than a preset temperature difference threshold, the air conditioning system controls each device to work in an air pump mode;
and/or the presence of a gas in the gas,
when Tout is less than T2 and the difference between Tout and Tin is greater than a predetermined temperature difference threshold, the air conditioning system controls each device to work in the gravity heat pipe mode.
9. The control method according to claim 7 or 8, characterized in that:
when the air conditioning system works in the compression mode, controlling the power device to operate in the compression mode, and controlling the condensing device, the liquid storage device, the throttling device and the evaporating device to operate so as to support the compression mode;
and/or the presence of a gas in the gas,
when the air conditioning system works in an air pump mode, controlling the power device to operate in the air pump mode, controlling the condensing device, the liquid storage device and the evaporating device to operate so as to support the air pump mode, and controlling the throttling device to be selectively opened or closed according to flow requirements;
and/or the presence of a gas in the gas,
and when the air conditioning system works in the gravity heat pipe mode, the power device is controlled to close and open the first bypass mechanism, and the first bypass mechanism, the condensing device, the liquid storage device, the throttling device and the evaporating device are controlled to operate so as to realize the gravity heat pipe mode.
10. The control method according to claim 9, characterized in that:
two ends of the throttling device are connected with a second bypass mechanism in parallel,
when the air conditioning system works in the air pump mode, the second bypass mechanism is controlled to be selectively opened or closed according to the flow requirement; and/or when the air conditioning system works in the gravity heat pipe mode, controlling the second bypass mechanism to be opened.
11. The control method according to claim 10, characterized in that:
the first bypass mechanism is at least one of an electromagnetic valve and an electric flow regulating valve, and/or the second bypass mechanism is at least one of an electronic expansion valve, an electromagnetic valve and an electric flow regulating valve.
12. The control method according to claim 7,
the installation height of the condensing device is higher than that of the evaporating device, and the installation height difference is higher than a preset value;
and/or the presence of a gas in the gas,
the power device is a compression and air pump integrated device or a device formed by connecting a compressor and an air pump in parallel;
and/or the presence of a gas in the gas,
the throttling device is an electronic expansion valve;
and/or the presence of a gas in the gas,
based on the indoor ambient temperature Tin and/or the outdoor ambient temperature Tout, the air conditioning system controlling the devices to work in one of a gravity heat pipe mode, a compression mode and an air pump mode includes:
periodically and repeatedly detecting the indoor environment temperature Tin and/or the outdoor environment temperature Tout, and switching the air conditioning system among the compression mode, the air pump mode and the gravity heat pipe mode based on the change of the indoor environment temperature Tin and/or the outdoor environment temperature Tout.
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| CN1227334A (en) * | 1998-02-23 | 1999-09-01 | 三菱电机株式会社 | Air conditioner |
| CN205448124U (en) * | 2016-03-24 | 2016-08-10 | 清华大学 | Compound air conditioning system of heat pipe |
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