CN110726234A - Load control method and device for improving load stability of unit and unit - Google Patents
Load control method and device for improving load stability of unit and unit Download PDFInfo
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- CN110726234A CN110726234A CN201910974475.3A CN201910974475A CN110726234A CN 110726234 A CN110726234 A CN 110726234A CN 201910974475 A CN201910974475 A CN 201910974475A CN 110726234 A CN110726234 A CN 110726234A
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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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a load control method, a load control device and a unit for improving the load stability of the unit. Wherein, the method comprises the following steps: monitoring whether the load at the tail end of the unit is in a low state; when the load is in a low state, executing unloading control operation; after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies. According to the invention, when the unit is required to be started in a project but the load condition is smaller, the host machine carries out unloading control according to the actual condition, and can further reduce the heat exchange area of the unit fins and reduce the condensation heat exchange quantity, thereby improving the operation range of the whole machine, ensuring the stable operation of the unit, effectively preventing the unit from being frequently started and stopped, protecting the compressor and prolonging the service life of the unit.
Description
Technical Field
The invention relates to the technical field of units, in particular to a load control method and device for improving load stability of a unit and the unit.
Background
The air-cooled screw unit is widely applied to places such as offices, superstores, hospitals and the like at present, and has a wide market application range.
The unit needs to be used in linkage with the engineering, and the running condition of the main machine is closely related to the actual condition of the engineering. When the load of the project is smaller and lower than the minimum load provided by the whole machine, the operation of the host machine cannot be stable, so that the phenomenon that the unit is frequently started and stopped and the like can occur.
Aiming at the problem that the unit cannot stably run due to the fact that the load is too small in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a load control method, a load control device and a unit for improving the load stability of the unit, and aims to solve the problem that the unit cannot stably run due to too small load in the prior art.
In order to solve the above technical problem, the present invention provides a load control method, wherein the method includes: monitoring whether the load at the tail end of the unit is in a low state; when the load is in a low state, executing unloading control operation; after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
Further, whether monitoring unit end load is in the state of leaning on low, include: monitoring the water supply temperature and the water return temperature of the unit chilled water; and judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.
Further, according to the water supply temperature, the water return temperature and a preset water outlet temperature, whether the load at the tail end of the unit is in a low state is judged, and the method comprises the following steps: calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.
Further, performing an unload control operation, comprising: reducing the load to less than or equal to: and presetting the minimum load + the load deviation value.
Further, the action of control solenoid valve is in order to reduce unit condenser heat transfer area, includes: monitoring real-time high-pressure on a pipeline between a compressor and an air-cooled condenser assembly; and controlling the action of the electromagnetic valve according to the real-time high-pressure.
Further, the action of the electromagnetic valve is controlled according to the real-time high-pressure, and the action comprises the following steps: if the real-time high-pressure is less than or equal to the pressure threshold value, controlling the electromagnetic valve to be closed; and if the real-time high-pressure is larger than the pressure threshold value, controlling the electromagnetic valve to be kept open, and waiting for the unit to stand by.
The present invention also provides a load control device, characterized in that the device comprises: the state monitoring module is used for monitoring whether the load at the tail end of the unit is in a low state; the unloading control module is used for executing unloading control operation when the load is in a low state; the load adjusting module is used for controlling the action of the electromagnetic valve to reduce the heat exchange area of the condenser of the unit if the load is still in a low state after the unloading control operation is executed; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
Further, the status monitoring module includes: the temperature monitoring unit is used for monitoring the water supply temperature and the water return temperature of the unit chilled water; and the judging unit is used for judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.
Further, the judging unit is specifically configured to calculate a temperature difference between inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.
Further, the unloading control module is specifically configured to reduce the load to be less than or equal to: and presetting the minimum load + the load deviation value.
Further, the load adjustment module includes: the pressure monitoring unit is used for monitoring real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly; and the control unit is used for controlling the action of the electromagnetic valve according to the real-time high-pressure.
The invention also provides a machine set which is characterized by comprising the load control device.
The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, when the unit is started up in engineering needs, but the load condition is smaller, the host machine carries out unloading control according to the actual condition, and can further reduce the heat exchange area of the unit fins and reduce the condensation heat exchange quantity, thereby improving the operation range of the whole machine, ensuring the stable operation of the unit, effectively preventing the unit from being frequently started and stopped, protecting the compressor and prolonging the service life of the unit.
Drawings
FIG. 1 is a flow chart of a load control method according to an embodiment of the invention;
FIG. 2 is a system block diagram of an air-cooled screw unit according to an embodiment of the present invention;
wherein: 1-a compressor, 2-a pressure sensor, 3-an air-cooled condenser assembly, 4-a ball valve, 5-a drying filter, 6-an energy saver, 7-a throttling device, 8 a-a chilled water supply temperature sensing bulb, 8 b-a chilled water return temperature sensing bulb, 9-an electromagnetic valve, 10-a one-way valve and 11-a shell and tube heat exchanger;
fig. 3 is a block diagram of a load control device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flow chart of a load control method according to an embodiment of the present invention, as shown in fig. 1, the method comprising the steps of:
step S101, monitoring whether the load at the tail end of the unit is in a low state;
step S102, when the load is in a low state, unloading control operation is executed;
step S103, after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
Through this embodiment, need the unit start-up when the engineering, but the load condition is less, and the host computer carries out the uninstallation control according to actual conditions, can also further reduce unit fin heat transfer area, reduces the condensation heat transfer volume to promote complete machine operating range, guarantee the unit steady operation, prevent effectively that the unit from frequently opening and stopping appearing, protection compressor promotes unit life.
The load control method provided by the invention can be applied to a machine set, such as an air-cooled screw machine set. FIG. 2 is a system block diagram of an air-cooled screw unit according to an embodiment of the present invention, and as shown in FIG. 2, a chilled water supply water temperature sensing bulb 8a for sensing a supply water temperature T is installed on a shell-and-tube heat exchanger1And a chilled water return water temperature sensing bulb 8b is also arranged and can be used for detecting the return water temperature T2。
In specific implementation, the load state can be judged according to the water supply temperature and the water return temperature of the chilled water of the unit. In view of the above, the present embodiment provides a preferred embodiment, that is, the supply water temperature and the return water temperature of the chilled water of the unit are monitored; and judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature. Specifically, calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between inlet and outlet water is the return water temperature-water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to the preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature plus the temperature deviation value, judging that the load is in a low state. Based on the method, the load state can be accurately and timely determined, and the subsequent unloading control operation is triggered when the load is low.
Setting the minimum load of the unit to Qmin, and the set value of the water outlet temperature of the unit (namely the preset water outlet temperature) to T3The optimal operating range of the high pressure is that A is less than or equal to P and B is less than or equal to B.
Temperature difference T between inlet and outlet water2—T1. Assuming that the preset difference is 1 ℃, the temperature deviation value is 0.5 ℃. The temperature difference between the inlet water and the outlet water is less than or equal to the preset difference value, the water supply temperature T is represented1And return water temperature T2Are relatively close. When T is detected to be less than or equal to 1 ℃ and T is detected1≤T3And when the temperature is higher than 0.5 ℃, judging that the load at the engineering end is low, and automatically controlling the unit to enter the low-load control operation.
The underload control operation comprises two parts, wherein the first part is to perform the unloading control operation firstly, namely: reducing the load to less than or equal to: the minimum load Qmin + load deviation value is preset (e.g., may be set to 10%). During specific execution, the load of the host is gradually reduced, and when the real-time load Q is less than or equal to Qmin + 10%, T is still detected to be less than or equal to 1 ℃ and T1And (4) T3+0.5 ℃, executing a second part, namely monitoring the real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly, and controlling the action of the electromagnetic valve according to the real-time high-pressure. And if the real-time high-pressure is less than or equal to the pressure threshold, the electromagnetic valve is controlled to be closed, and if the real-time high-pressure is greater than the pressure threshold, the electromagnetic valve is controlled to be kept open to wait for the stand-by of the unit.
In the above fig. 2, a pressure sensor 2 is provided between the compressor 1 and the air-cooled condenser assembly 3 for monitoring the real-time high pressure on the pipeline between the compressor 1 and the air-cooled condenser assembly 3. The air-cooled condenser assembly 3 includes a plurality of air-cooled condensers, and the solenoid valve 9 is disposed between the plurality of air-cooled condensers. For example, in fig. 2, the air-cooled condenser assembly 3 includes 4 air-cooled condensers, the electromagnetic valve 9 is disposed between 1 air-cooled condenser and 3 air-cooled condensers, and after the electromagnetic valve 9 is closed, the work of 1 air-cooled condenser can be reduced, so as to reduce the heat exchange area of the unit condenser.
Of course, the position of the solenoid valve is not limited to this, and 4 air-cooled condensers may be divided into 2 air-cooled condensers and 2 air-cooled condensers as required. More air-cooled condenser work can be reduced after the solenoid valve is closed.
During specific implementation, the action of the electromagnetic valve 9 is controlled according to the real-time high-pressure P, so that the heat exchange area of the condenser of the unit is reduced, and the load is further reduced.
1) When P is less than or equal to B, the heat exchange area can be reduced, the electromagnetic valve 9 is closed, the one-way valve 10 prevents the refrigerant subjected to heat exchange by the other fins from entering the fin heat exchanger, and the condensation load is reduced;
2) when P is larger than B, the electromagnetic valve 9 is kept in an open state, and if the load of the unit is small, the unit is waited to be normally standby.
The unit refrigerated water business turn over water difference in temperature that this embodiment detected through refrigerated water supply temperature sensing package 8a and refrigerated water return water temperature sensing package 8b judges terminal load demand, and the host computer can show the real-time output load of unit, when unit demonstration load has arrived minimum load, the high-pressure P who detects through pressure sensor 2 closes solenoid valve 9 operation, guarantees that pressure reduces condensation heat transfer area under the suitable within range condition, thereby reduces complete machine output load, makes the compressor continuously operate. The operation range of the unit is wider, the engineering adaptability is better, the stable operation of the unit is ensured, and the use experience of a user is improved.
Example 2
In correspondence with the load control method described in fig. 1, the present embodiment provides a load control apparatus, as shown in a block diagram of the structure of the load control apparatus shown in fig. 3, the apparatus including:
the state monitoring module 10 is used for monitoring whether the load at the tail end of the unit is in a low state;
the unloading control module 20 is used for executing unloading control operation when the load is in a low state;
the load adjusting module 30 is used for controlling the action of the electromagnetic valve to reduce the heat exchange area of the unit condenser if the load is still in a low state after the unloading control operation is executed; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
Through this embodiment, need the unit start-up when the engineering, but the load condition is less, and the host computer carries out the uninstallation control according to actual conditions, can also further reduce unit fin heat transfer area, reduces the condensation heat transfer volume to promote complete machine operating range, guarantee the unit steady operation, prevent effectively that the unit from frequently opening and stopping appearing, protection compressor promotes unit life.
The above-mentioned state monitoring module includes: the temperature monitoring unit is used for monitoring the water supply temperature and the water return temperature of the unit chilled water; and the judging unit is used for judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.
Specifically, the judging unit is used for calculating the temperature difference between inlet water and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.
After determining that the compliance is low, performing an unload control operation, wherein the unload control module is specifically configured to reduce the load to less than or equal to: and presetting the minimum load + the load deviation value. If the compliance is still in a low state after the unload control, then load adjustment is required. The present embodiment provides a preferred implementation manner, that is, the load adjustment module includes: the pressure monitoring unit is used for monitoring real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly; and the control unit is used for controlling the action of the electromagnetic valve according to the real-time high-pressure.
Through the mode, when the tail end of the project is in a low-load state, the main machine can still meet the requirement of providing required load, the stable operation of the unit is kept, the heat exchange area of the unit fins is controlled through the electromagnetic valve and the one-way valve, the operation range of the whole machine is effectively enlarged, and the project adaptability is stronger. The scheme provides an operation method to guarantee the stability of the operation of the whole machine, guarantee the use comfort of customers and effectively prolong the service life of the unit.
The embodiment further provides a unit, which comprises the load control device, and is used for realizing the load control of the unit and ensuring the load stability of the unit. The machine set can be an air-cooled screw machine set.
Example 3
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
Embodiments of the present invention provide a non-volatile computer storage medium, where a computer-executable instruction is stored, and the computer-executable instruction may execute a load control method in any of the above method embodiments.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A method of load control, the method comprising:
monitoring whether the load at the tail end of the unit is in a low state;
when the load is in a low state, executing unloading control operation;
after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
2. The method of claim 1, wherein monitoring whether the unit end load is in a low state comprises:
monitoring the water supply temperature and the water return temperature of the unit chilled water;
and judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.
3. The method according to claim 1, wherein judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and a preset water outlet temperature comprises:
calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature;
and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.
4. The method of claim 1, wherein performing an offload control operation comprises:
reducing the load to less than or equal to: and presetting the minimum load + the load deviation value.
5. The method of claim 1, wherein controlling the actuation of the solenoid valve to reduce the unit condenser heat transfer area comprises:
monitoring real-time high-pressure on a pipeline between a compressor and an air-cooled condenser assembly;
and controlling the action of the electromagnetic valve according to the real-time high-pressure.
6. The method of claim 5, wherein controlling the actuation of the solenoid valve based on the real-time high pressure comprises:
if the real-time high-pressure is less than or equal to the pressure threshold value, controlling the electromagnetic valve to be closed;
and if the real-time high-pressure is larger than the pressure threshold value, controlling the electromagnetic valve to be kept open, and waiting for the unit to stand by.
7. A load control device, characterized in that the device comprises:
the state monitoring module is used for monitoring whether the load at the tail end of the unit is in a low state;
the unloading control module is used for executing unloading control operation when the load is in a low state;
the load adjusting module is used for controlling the action of the electromagnetic valve to reduce the heat exchange area of the condenser of the unit if the load is still in a low state after the unloading control operation is executed; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.
8. The apparatus of claim 7, wherein the condition monitoring module comprises:
the temperature monitoring unit is used for monitoring the water supply temperature and the water return temperature of the unit chilled water;
and the judging unit is used for judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.
9. The apparatus of claim 7,
the judging unit is specifically used for calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.
10. The apparatus of claim 7,
the unloading control module is specifically configured to reduce the load to be less than or equal to: and presetting the minimum load + the load deviation value.
11. The apparatus of claim 7, wherein the load adjustment module comprises:
the pressure monitoring unit is used for monitoring real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly;
and the control unit is used for controlling the action of the electromagnetic valve according to the real-time high-pressure.
12. An assembly, characterized in that it comprises a load control device according to any one of claims 7 to 11.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418326A (en) * | 2020-03-03 | 2021-09-21 | 艾默生环境优化技术(苏州)有限公司 | Pre-protection method for condensing unit and condensing unit |
| CN115682572A (en) * | 2022-11-07 | 2023-02-03 | 珠海格力电器股份有限公司 | Chilled water unit load determining and loading and unloading control method, device and equipment |
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| US20120016526A1 (en) * | 2011-09-27 | 2012-01-19 | Jpmorgan Chase Bank, N.A. | Heating, Ventilation, and Air Conditioning Management System and Method |
| CN104089347A (en) * | 2014-06-24 | 2014-10-08 | 广东申菱空调设备有限公司 | Low-temperature air-cooled water chiller unit and control method thereof |
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| CN108050741A (en) * | 2017-12-18 | 2018-05-18 | 重庆美的通用制冷设备有限公司 | Handpiece Water Chilling Units and its duty control method and control device |
| CN109764586A (en) * | 2018-12-04 | 2019-05-17 | 珠海格力电器股份有限公司 | A kind of unit start-up control method and device adapting to variable-flow |
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| CN113418326A (en) * | 2020-03-03 | 2021-09-21 | 艾默生环境优化技术(苏州)有限公司 | Pre-protection method for condensing unit and condensing unit |
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| CN115682572A (en) * | 2022-11-07 | 2023-02-03 | 珠海格力电器股份有限公司 | Chilled water unit load determining and loading and unloading control method, device and equipment |
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