CN113739357A - Efficient machine room control method, device and system and central air conditioner - Google Patents
Efficient machine room control method, device and system and central air conditioner Download PDFInfo
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- CN113739357A CN113739357A CN202110972640.9A CN202110972640A CN113739357A CN 113739357 A CN113739357 A CN 113739357A CN 202110972640 A CN202110972640 A CN 202110972640A CN 113739357 A CN113739357 A CN 113739357A
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application relates to a high-efficiency machine room control method, a device and a system and a central air conditioner. The frequency-fixed cooling machine and the frequency-variable cooling machine are combined, so that the energy efficiency of a machine room is improved, the initial investment cost is reduced, and the recovery period is shortened.
Description
Technical Field
The application belongs to the technical field of efficient machine room systems, and particularly relates to a method, a device and a system for controlling an efficient machine room and a central air conditioner.
Background
With the continuous development of science and technology, people have higher and higher energy-saving requirements on refrigeration and heating equipment, the concept of the high-efficiency machine room is a hot word in the market of central air-conditioning public projects in two years, the high-efficiency machine room has the characteristics of excellent energy conservation and high installation efficiency, and is accepted by more and more professional persons and owners in the industry, and the application field is wider and wider. In order to meet the energy-saving requirement, a full-frequency conversion cooler is conventionally adopted in a high-efficiency machine room system, and auxiliary equipment such as a circulating water pump and a cooling tower are all full-frequency conversion.
Disclosure of Invention
In order to overcome the problem that the recovery period is longer due to high initial investment cost of a traditional high-efficiency machine room system adopting a full frequency conversion cooler at least to a certain extent, the application provides a high-efficiency machine room control method, a device and a system and a central air conditioner.
In a first aspect, the present application provides an efficient machine room control method, including:
acquiring real-time operation parameters of equipment;
judging whether loading conditions are met or not according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
and controlling to increase the opening of the variable frequency refrigerator when the variable frequency loading condition is met or controlling to increase the opening of the fixed frequency refrigerator when the fixed frequency loading condition is met.
Further, before obtaining the real-time parameters of the device operation, the method further includes:
when the starting equipment is used for refrigerating, the variable-frequency refrigerator is started preferentially.
Further, the preferentially starting the variable frequency refrigerator includes:
and starting the corresponding variable-frequency cooler according to the alternate rest principle.
Further, the variable frequency loading condition includes:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
moreover, the number of the variable frequency coolers can be opened is more than or equal to 1;
and the average load rate of the running variable frequency refrigerator is more than or equal to the set value of the load of the variable frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the load temperature deviation value of the variable-frequency cooler;
and the average load rate of the running variable-frequency refrigerator is more than or equal to the set value of the loading load of the variable-frequency unit within the continuous preset time period, and the water supply temperature of the main freezing pipe is more than or equal to the set value of the water outlet temperature of the main freezing pipe plus the offset value of the loading temperature of the variable-frequency refrigerator.
Further, the fixed-frequency loading condition includes:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
the number of the open-able constant-frequency coolers is more than or equal to 1, and the number of the open-able variable-frequency coolers is less than 1;
and the average load rate of the running fixed-frequency cooler is more than or equal to the set load loading value of the fixed-frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the offset value of the loading temperature of the fixed frequency refrigerator;
and the average load rate of the running fixed-frequency refrigerator is more than or equal to the set loading load value of the fixed-frequency unit within the continuous preset time period, and the water supply temperature of the freezing main pipe is more than or equal to the set water outlet temperature value of the freezing main pipe and the offset value of the loading temperature of the fixed-frequency refrigerator.
Further, the method for controlling the increasing of the opening of the frequency conversion cold machine when the frequency conversion loading condition is met or the increasing of the opening of the fixed frequency cold machine when the fixed frequency loading condition is met comprises the following steps:
sequentially starting a cooling water pump, a chilled water pump and a cooling tower fan;
judging whether the cooling water pump, the chilled water pump and the cooling tower fan reach preset operating frequency or not;
if yes, starting the refrigerator with long running time according to the running time of the equipment.
Further, start cooling water pump, frozen water pump and cooling tower fan in proper order, include:
when equipment is started for refrigeration, a cooling water pump is started;
judging whether the operating frequency of the cooling water pump meets a preset first frequency threshold value or not;
if yes, starting a freezing water pump;
judging whether the operating frequency of the cooling water pump meets a preset second frequency threshold value or not;
if so, judging whether the return water temperature of the cooling main pipe is greater than the sum of the protection lower limit of the cooling return water temperature of the unit and the starting temperature deviation value of the fan of the cooling tower;
if yes, a fan of the cooling tower is started.
Further, the method also comprises the following steps:
and starting a corresponding cooling water pump, a refrigerating water pump and a cooling tower fan according to the principle of alternate rest.
Further, the method also comprises the following steps:
before the equipment is opened, the corresponding valve of the equipment is opened.
Further, the method also comprises the following steps:
and setting the water outlet temperature of the corresponding cold machine opened by loading to be the same as the water outlet temperature of the cold machine opened before loading.
Further, the method also comprises the following steps:
and resetting the outlet water temperature of the cold machine when the cold machine outlet water temperature resetting condition is met.
Further, the meeting of the cold machine outlet water temperature reset condition includes:
the number of running cold machines is less than or equal to 2;
in addition, the water outlet temperature resetting delay time period of the continuous cooler meets the conditions that the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the water outlet temperature resetting water pump frequency adjusting value of the continuous cooler;
in addition, the water outlet temperature resetting delay time period of the continuous cold machine meets the condition that the temperature difference of the water supply and the return of the freezing main pipe is less than the set value of the temperature difference of the water supply and the return of the freezing main pipe-a first set deviation value of the temperature difference of the water supply and the return of the freezing main pipe;
in addition, the water outlet temperature of the continuous cooler meets the requirement that the outdoor wet bulb temperature is less than the wet bulb temperature of the indoor design parameter within the reset delay time period;
and controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
Further, after the temperature of the outlet water of the cold machine is increased, the method further comprises the following steps:
judging whether the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the frequency adjusting value of the water pump is reset according to the water outlet temperature resetting time interval of the cold machine, and meeting the requirement that the temperature difference of the supply and return water of the freezing main pipe is less than the temperature difference set value of the supply and return water of the freezing main pipe-the first set deviation value of the temperature difference of the supply and return water of the freezing main pipe within the water outlet temperature resetting delay time interval of the continuous cold machine;
and if so, controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
Further, the meeting of the cold machine outlet water temperature reset condition includes:
judging whether the condition of reducing the water outlet temperature of the refrigerator is met or not according to the water outlet temperature resetting time interval of the refrigerator, wherein the condition of reducing the water outlet temperature of the refrigerator comprises that the frequency of a freezing water pump is greater than the maximum frequency of a variable-frequency water pump and the frequency adjusting value of the water outlet temperature resetting water pump are met within the water outlet temperature resetting delay time period of the continuous refrigerator, and the water supply and return temperature difference of a freezing main pipe is greater than the set value of the water supply and return temperature difference of the freezing main pipe and the second set deviation value of the water supply and return temperature difference of the freezing main pipe;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
Further, after the outlet water temperature of the cold machine is reduced, the method further comprises the following steps:
judging whether the frequency of a freezing water pump is larger than the maximum frequency of a variable-frequency water pump or not at intervals of the cold machine water outlet temperature resetting time interval, and judging whether the water outlet temperature resetting water pump frequency adjusting value meets the requirements of the frequency of the freezing water pump, the maximum frequency of the variable-frequency water pump, the cold machine water outlet temperature resetting water pump frequency adjusting value, and the main freezing pipe water supply and return temperature difference is larger than the main freezing pipe water supply and return temperature difference set value and the main freezing pipe water supply and return temperature difference set deviation value;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
Further, the reset value of the outlet water temperature of the refrigerator is between the lower reset limit value of the outlet water temperature of the refrigerator and the upper reset limit value of the outlet water temperature of the refrigerator.
Furthermore, the set value of the outlet water temperature of the freezing main pipe is equal to the set value of the return water temperature of the freezing main pipe and the set value of the outlet water temperature of the running refrigerator.
Further, the method also comprises the following steps:
judging whether a load shedding condition is met or not according to the equipment operation real-time parameters, wherein the load shedding condition comprises a fixed-frequency load shedding condition and a variable-frequency load shedding condition;
and controlling to reduce the starting number of the variable frequency coolers when the variable frequency load shedding condition is met or controlling to reduce the starting number of the fixed frequency coolers when the fixed frequency load shedding condition is met.
Further, the variable frequency load shedding condition includes:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
moreover, the starting number of the fixed frequency coolers is less than 1;
the average load of the running unit is less than the set value of the load reduction load of the variable frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the load reduction temperature deviation value of the variable-frequency refrigerator;
and the average load of the running unit is less than the set value of the load reduction load of the variable-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the variable-frequency refrigerator are met in a continuous preset time period.
Further, the fixed-frequency load shedding condition includes:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
the average load of the running unit is less than the set value of the load reduction load of the fixed-frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the fixed-frequency refrigerator;
and the average load of the running unit is less than the set value of the load shedding load of the fixed-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the offset value of the load shedding temperature of the fixed-frequency refrigerator are met in a continuous preset time period.
Further, after controlling the frequency conversion refrigerator to be turned off or controlling the fixed frequency refrigerator to be turned off, the method further includes:
and closing the freezing water pump, the cooling water pump and the cooling tower fan in sequence.
Further, the method also comprises the following steps:
and before closing the equipment, closing the corresponding valve of the equipment.
Further, the device runs real-time parameters, including:
one or more of the running time of the started refrigerator, the average load of the running unit, the water supply temperature of the freezing main pipe and the temperature and humidity value of the outdoor environment.
In a second aspect, the present application provides an efficient machine room control apparatus, comprising:
the acquisition module is used for acquiring real-time operation parameters of the equipment;
the judging module is used for judging whether loading conditions are met according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
and the control module is used for controlling the starting of the frequency conversion cold machine when the frequency conversion loading condition is met or controlling the starting of the fixed frequency cold machine when the frequency conversion loading condition is met.
In a third aspect, the present application provides an efficient machine room control system, including:
the system comprises at least one fixed-frequency cooler, at least one variable-frequency cooler and the high-efficiency machine room control device according to the second aspect, wherein the high-efficiency machine room control device controls the variable-frequency cooler to be started when the variable-frequency loading condition is met, or controls the fixed-frequency cooler to be started when the fixed-frequency loading condition is met.
Further, the method also comprises the following steps:
the cooling water pump, the cooling water pump corresponding valve, the chilled water pump, the cooling water pump corresponding valve, the cooling tower fan and the cooling tower fan valve.
In a fourth aspect, the present application provides a central air conditioner, comprising: an efficient room control system as described in the third aspect.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the efficient machine room control method comprises the steps of obtaining equipment operation real-time parameters, judging whether loading conditions are met or not according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions, controlling the starting of a variable-frequency cooler to be increased when the variable-frequency loading conditions are met or controlling the starting of the fixed-frequency cooler to be increased when the fixed-frequency loading conditions are met, and combining the fixed-frequency cooler with the variable-frequency cooler, so that the energy efficiency of the machine room is improved, the initial investment cost is reduced, and the recovery period is shortened.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart of an efficient machine room control method according to an embodiment of the present application.
Fig. 2 is a flowchart of an efficient machine room control method according to another embodiment of the present application.
Fig. 3 is a flowchart of another efficient machine room control method according to an embodiment of the present application.
Fig. 4 is a flowchart of another efficient machine room control method according to an embodiment of the present application.
Fig. 5 is a functional structure diagram of an efficient machine room control device according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of an efficient machine room control system according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of another efficient machine room control system according to an embodiment of 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 below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a high-efficiency machine room control method according to an embodiment of the present application, and as shown in fig. 1, the high-efficiency machine room control method includes:
s11: acquiring real-time operation parameters of equipment;
s12: judging whether loading conditions are met or not according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
s13: and controlling to increase the opening of the variable frequency refrigerator when the variable frequency loading condition is met or controlling to increase the opening of the fixed frequency refrigerator when the fixed frequency loading condition is met.
The conventional high-efficiency machine room conventionally adopts a full-frequency-conversion cold machine for meeting the energy-saving requirement, auxiliary equipment such as a circulating water pump and a cooling tower adopts full frequency conversion, and although the machine room of the high-efficiency machine room system is high in energy efficiency, the initial investment cost is high, so that the recovery period is longer.
In the embodiment, the efficient machine room control method comprises the steps of obtaining real-time equipment operation parameters, judging whether loading conditions are met or not according to the real-time equipment operation parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions, controlling and increasing the opening of a variable-frequency cooler when the variable-frequency loading conditions are met, controlling and increasing the opening of the fixed-frequency cooler when the fixed-frequency loading conditions are met, combining the fixed-frequency cooler and the variable-frequency cooler, improving the machine room energy efficiency, reducing the initial investment cost and shortening the recovery period.
An embodiment of the present invention provides another efficient machine room control method, as shown in a flowchart in fig. 2, where the efficient machine room control method includes:
s21: when equipment is started for refrigeration, the variable-frequency refrigerator is started preferentially;
in some embodiments, preferentially turning on the variable frequency refrigerator includes:
and starting the corresponding variable-frequency cooler according to the alternate rest principle.
It should be noted that, the principle of alternate break is to make the equipment with short running time put into use as much as possible according to the equipment running time recorded by the system, that is, the equipment with short running time is preferentially started according to the length of the equipment running time.
S22: acquiring real-time operation parameters of equipment;
device operating real-time parameters including, but not limited to:
the running time of the started refrigerator, the average load of the running unit, the water supply temperature of the freezing main pipe, the temperature and humidity value of the outdoor environment and the like.
S23: judging whether loading conditions are met or not according to equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
in this embodiment, the variable frequency loading conditions include, but are not limited to:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
moreover, the number of the variable frequency coolers can be opened is more than or equal to 1;
and the average load rate of the running variable frequency refrigerator is more than or equal to the set value of the load of the variable frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the load temperature deviation value of the variable-frequency cooler;
and the average load rate of the running variable-frequency refrigerator is more than or equal to the set value of the loading load of the variable-frequency unit within the continuous preset time period, and the water supply temperature of the main freezing pipe is more than or equal to the set value of the water outlet temperature of the main freezing pipe plus the offset value of the loading temperature of the variable-frequency refrigerator.
Specifically, 1) the running time of the started refrigerator is more than or equal to 1800s of the loading interval time of the refrigerator; 2) the number of the cold machines which can be started is more than or equal to 1; 3) the average load rate of the running cold machine is more than or equal to 90 percent of the set value of the load of the frequency conversion unit; 4) the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe, namely 6 ℃ plus the loading temperature deviation value of the refrigerator, namely 1 ℃; 5) the condition 3) or 4) is satisfied for 5 consecutive minutes.
In this embodiment, the fixed frequency loading condition includes, but is not limited to:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
moreover, the number of the openable fixed-frequency coolers is more than or equal to 1, and the number of the openable variable-frequency coolers is less than 1;
and the average load rate of the running fixed-frequency cooler is more than or equal to the set load loading value of the fixed-frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the offset value of the loading temperature of the fixed frequency refrigerator;
and the average load rate of the running fixed-frequency refrigerator is more than or equal to the set loading load value of the fixed-frequency unit within the continuous preset time period, and the water supply temperature of the freezing main pipe is more than or equal to the set water outlet temperature value of the freezing main pipe and the offset value of the loading temperature of the fixed-frequency refrigerator.
Specifically, 1) the running time of the started refrigerator is more than or equal to 1800s of the loading interval time of the refrigerator; 2) the number of the cold machines which can be started is more than or equal to 1; 3) the average load rate of the running cold machine is more than or equal to 100% of the set value of the loading load of the fixed-frequency unit; 4) the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe, namely 6 ℃ plus the loading temperature deviation value of the refrigerator, namely 1 ℃; 5) the condition 3) or 4) is satisfied for 5 consecutive minutes.
S24: and controlling to increase the opening of the variable frequency refrigerator when the variable frequency loading condition is met or controlling to increase the opening of the fixed frequency refrigerator when the fixed frequency loading condition is met.
In some embodiments, after a cooling machine to be started is selected in the refrigeration loading process, a cooling water pump is started according to a principle of alternate rest, and the frequency is consistent with that of the operated cooling water pump; starting a cooling tower fan according to the load increasing and reducing principle of the cooling tower fan, wherein the frequency is consistent with that of the cooling tower fan which is already operated; opening electric valves corresponding to the electric butterfly valve at the cooling side of the unit to be started and the fan of the cooling tower; opening an electric valve at an outlet of a freezing side of the unit to be opened; and after the water pump, the fan and the valve are all opened in place, the cold machine to be opened is started, and the water outlet temperature setting is consistent with that of the operated unit.
S25: judging whether a load shedding condition is met or not according to the real-time parameters of equipment operation, wherein the load shedding condition comprises a fixed-frequency load shedding condition and a variable-frequency load shedding condition;
in this embodiment, the variable frequency load shedding condition includes, but is not limited to:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
moreover, the starting number of the fixed frequency coolers is less than 1;
the average load of the running unit is less than the set value of the load reduction load of the variable frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the load reduction temperature deviation value of the variable-frequency refrigerator;
and the average load of the running unit is less than the set value of the load reduction load of the variable-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the variable-frequency refrigerator are met in a continuous preset time period.
Specifically, 1) the running time of the started refrigerator is more than or equal to 1800s of the load shedding interval time of the refrigerator; 2) the average load of the running unit is less than the set value of the load reduction load of the variable frequency unit by 80% (-1 operation number of the unit)/operation number of the unit; 3) the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the deviation value of the load reduction temperature of the refrigerator is 1 ℃; 4) the condition 2) or 3) is satisfied for 5 consecutive minutes.
In this embodiment, the fixed frequency load shedding condition includes, but is not limited to:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
the average load of the running unit is less than the set value of the load reduction load of the fixed-frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the fixed-frequency refrigerator;
and the average load of the running unit is less than the set value of the load shedding load of the fixed-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the offset value of the load shedding temperature of the fixed-frequency refrigerator are met in a continuous preset time period.
The running time of the started cooler is more than or equal to the time 1800s of the load reduction interval of the cooler); 2) the average load of the running unit is less than the set value of the load reduction load of the fixed-frequency unit by 90 percent (the number of running units is-1)/the number of running units; 3) the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the deviation value of the load reduction temperature of the refrigerator is 1 ℃; 4) the condition 2) or 3) is satisfied for 5 consecutive minutes.
And when the frequency conversion unit and the fixed frequency unit operate simultaneously and need load shedding, the fixed frequency unit is closed preferentially.
S26: and controlling to reduce the starting number of the variable frequency coolers when the variable frequency load shedding condition is met, or controlling to reduce the starting number of the fixed frequency coolers when the fixed frequency load shedding condition is met.
After a running cold machine is closed, a command of closing a freezing water pump is issued according to a principle of alternate rest, and after the freezing water pump is closed, an electric valve corresponding to a freezing side of the unit is closed; switching off a cooling water pump according to a principle of alternate rest, and switching off the cooling water pump in place; closing the electric valve at the cooling side of the unit; closing an electric valve of a cooling tower fan according to the load increasing and reducing principle of the cooling tower; and after the electric valve is closed, closing the cooling tower fan.
In the embodiment, the scheme of the efficient machine room combining the fixed-frequency cooler and the variable-frequency cooler is adopted to adapt to the change of the end load demand and the change of the temperature and humidity of the outdoor environment, so that double energy conservation of the freezing side and the cooling side is realized, the variable-frequency cooler is set to be preferentially loaded, the fixed-frequency unit is set to be preferentially unloaded, the exclusive load-reducing condition corresponding to the fixed-frequency unit is designed, and the refrigerating system is ensured to operate in the efficient energy efficiency range all the time.
An embodiment of the present invention provides another efficient machine room control method, which is a flowchart shown in fig. 3, and controls a variable frequency cooler to be turned on or a fixed frequency cooler to be turned on, where the method includes:
s31: sequentially starting a cooling water pump, a chilled water pump and a cooling tower fan;
in some embodiments, turning on the cooling water pump, the chilled water pump, and the cooling tower fan in sequence includes:
s311: when equipment is started for refrigeration, a cooling water pump is started;
s312: judging whether the operating frequency of the cooling water pump meets a preset first frequency threshold value or not;
s313: if yes, starting a freezing water pump;
s314: judging whether the operating frequency of the cooling water pump meets a preset second frequency threshold value or not;
s315: if so, judging whether the return water temperature of the cooling main pipe is greater than the sum of the protection lower limit of the cooling return water temperature of the unit and the starting temperature deviation value of the fan of the cooling tower;
s316: if yes, a fan of the cooling tower is started.
Further, the method also comprises the following steps:
and starting a corresponding cooling water pump, a refrigerating water pump and a cooling tower fan according to the principle of alternate rest.
S32: judging whether the cooling water pump, the chilled water pump and the cooling tower fan reach preset operating frequency or not;
s33: if yes, starting the refrigerator with long running time according to the running time of the equipment.
Further, the method also comprises the following steps:
before the equipment is opened, the corresponding valve of the equipment is opened.
In some embodiments, after controlling the variable frequency cooler to be turned off or controlling the fixed frequency cooler to be turned off, the method further includes:
and closing the freezing water pump, the cooling water pump and the cooling tower fan in sequence.
And before closing the equipment, closing the corresponding valve of the equipment.
The refrigeration starting process selects a variable frequency refrigerator according to a principle of alternate rest, starts a water inlet electric valve of the cooling side of the unit, and starts electric butterfly valves corresponding to 4 cooling tower fans according to a principle of load reduction of the cooling tower fans; after the valve is opened in place, starting a cooling water pump according to a principle of alternate rest, wherein the frequency is set to be 30 Hz; after the cooling water pump reaches the default frequency, starting an electric butterfly valve at the outlet of the freezing side of the unit; and after the valve is opened in place, starting a freezing water pump according to a principle of alternate rest, and setting the frequency as the starting frequency of the variable-frequency water pump to be 30 Hz. Judging whether the return water temperature of the cooling header pipe is greater than (the lower limit value of the protection of the cooling return water temperature of the unit is 12 ℃) + (the starting temperature deviation value of the fan of the cooling tower is 2 ℃), if so, starting the fan of the cooling tower, and setting the frequency as the starting frequency of the variable-frequency fan of the cooling tower to be 30 Hz; otherwise, the fan is started after the conditions are met. After the water pump, the cooling tower fan and the valve are all opened in place, the frequency conversion cooler to be opened is started, and meanwhile, the water outlet temperature is set to be 6 ℃.
In this embodiment, the constant-frequency cooler and the variable-frequency cooler are started by matching auxiliary equipment such as the circulating water pump and the cooling fan, and the circulating water pump and the cooling fan are both in full frequency conversion, so that the efficient machine room is high in energy efficiency, low in initial investment cost and short in recovery period.
An embodiment of the present invention provides another efficient machine room control method, which is a flowchart shown in fig. 4, for controlling a variable frequency cooler to be turned on or a fixed frequency cooler to be turned on, and the method includes:
s41: and setting the water outlet temperature of the corresponding cold machine opened by loading to be the same as the water outlet temperature of the cold machine opened before loading.
S42: and resetting the outlet water temperature of the cold machine when the cold machine outlet water temperature resetting condition is met.
The temperature of the outlet water of the reset cooler can be adapted to the change of the end requirement in real time.
In some embodiments, satisfying the cold outlet water temperature reset condition includes:
the number of running cold machines is less than or equal to 2;
in addition, the water outlet temperature resetting delay time period of the continuous cooler meets the conditions that the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the water outlet temperature resetting water pump frequency adjusting value of the continuous cooler;
in addition, the water outlet temperature resetting delay time period of the continuous cold machine meets the condition that the temperature difference of the water supply and the return of the freezing main pipe is less than the set value of the temperature difference of the water supply and the return of the freezing main pipe-a first set deviation value of the temperature difference of the water supply and the return of the freezing main pipe;
in addition, the water outlet temperature of the continuous cooler meets the requirement that the outdoor wet bulb temperature is less than the wet bulb temperature of the indoor design parameter within the reset delay time period;
and controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
Specifically, 1) the number of running cold machines is less than or equal to 2; 2) the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump by 30Hz, and the water pump frequency regulating value is reset by the water outlet temperature of the refrigerator by 5 Hz; 3) the temperature difference between the water supply and return of the freezing main pipe is less than the temperature difference set value between the water supply and return of the freezing main pipe and a first set deviation value of the temperature difference between the water supply and return of the freezing main pipe is 0.5 ℃; 4) the outdoor wet bulb temperature is less than the wet bulb temperature of the indoor design parameter; 5) the continuous cold machine water outlet temperature resetting delay time 30s meets the conditions 2), 3) and 4), and the cold machine water outlet temperature is increased according to the cold machine water outlet temperature resetting gradient (0.5 ℃).
In some embodiments, after raising the temperature of the cold machine effluent, the method further comprises:
judging whether the frequency of a freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the frequency adjusting value of a water pump reset by the water outlet temperature of the refrigerator or not every 1800s of the water outlet temperature reset time interval of the refrigerator, and meeting the requirement that the temperature difference of supply and return water of a freezing main pipe is less than the set value of the temperature difference of supply and return water of the freezing main pipe-the first set deviation value of the temperature difference of supply and return water of the freezing main pipe within the water outlet temperature reset delay time period of the continuous refrigerator;
and if so, controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
In some embodiments, satisfying the cold outlet water temperature reset condition includes:
judging whether the condition of reducing the water outlet temperature of the refrigerator is met or not according to the water outlet temperature resetting time interval of the refrigerator, wherein the condition of reducing the water outlet temperature of the refrigerator comprises that the frequency of a freezing water pump is greater than the maximum frequency of a variable-frequency water pump and the frequency adjusting value of the water outlet temperature resetting water pump are met within the water outlet temperature resetting delay time period of the continuous refrigerator, and the water supply and return temperature difference of a freezing main pipe is greater than the set value of the water supply and return temperature difference of the freezing main pipe and the second set deviation value of the water supply and return temperature difference of the freezing main pipe;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
Specifically, 1) the frequency of the freezing water pump is larger than the maximum frequency of the variable-frequency water pump, and the water pump frequency adjusting value is reset to 5Hz according to the water outlet temperature of the cold machine; 2) the temperature difference between the supply water and the return water of the freezing main pipe is more than the temperature difference set value between the supply water and the return water of the freezing main pipe and the temperature difference between the supply water and the return water of the freezing main pipe, and the second set deviation value of the temperature difference between the supply water and the return water of the freezing main pipe is 1 ℃; 3) the continuous cooler water outlet temperature resetting delay time (30s) meets the condition 1)2), and the reduction of the cooler water outlet temperature is reduced according to the cooler water outlet temperature resetting gradient (0.5 ℃).
Further, after the outlet water temperature of the cold machine is reduced, the method further comprises the following steps:
judging whether the frequency of a freezing water pump is larger than the maximum frequency of a variable-frequency water pump or not at intervals of a cold machine water outlet temperature resetting time interval (300s) or not, and judging whether the water outlet temperature of the freezing main pipe is larger than a water supply and return temperature set value of the freezing main pipe and a water supply and return temperature set deviation value of the freezing main pipe;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
In some embodiments, the cooler exit water temperature reset value is between a cooler exit water temperature reset lower limit and a cooler exit water temperature reset upper limit. The lower limit value of the cold machine water outlet temperature is 6 ℃ for example, and the upper limit value of the cold machine water outlet temperature is 12 ℃ for example.
And the set value of the outlet water temperature of the freezing main pipe is the set value of the return water temperature of the freezing main pipe-the set value of the outlet water temperature of the running refrigerator.
In this embodiment, according to the change of the indoor end load demand and the change of the outdoor environment temperature and humidity, the number of units to be started and the operating state point are adjusted in real time, the highest machine room energy efficiency value is reached, the double energy saving of the freezing side and the cooling side is realized with the lowest energy consumption, and the lowest energy consumption adapts to the change of the indoor end load demand and the change of the outdoor environment temperature and humidity.
An embodiment of the present invention provides an efficient machine room control device, and as shown in a functional structure diagram of fig. 5, the efficient machine room control device includes:
an obtaining module 51, configured to obtain a device operation real-time parameter;
the judging module 52 is configured to judge whether a loading condition is met according to the device operation real-time parameter, where the loading condition includes a fixed-frequency loading condition and a variable-frequency loading condition;
and the control module 53 is used for controlling the starting of the frequency conversion refrigerator when the frequency conversion loading condition is met, or controlling the starting of the fixed frequency refrigerator when the fixed frequency loading condition is met.
In some embodiments, further comprising:
and the starting module 54 is used for starting the variable-frequency cooler preferentially when the equipment is started for refrigeration.
And the setting module 55 is used for setting the water outlet temperature of the corresponding cold machine opened by loading to be the same as the water outlet temperature of the cold machine opened before loading.
And the resetting module 56 is used for resetting the cold machine water outlet temperature when the cold machine water outlet temperature resetting condition is met.
In some embodiments, the control module 53 is further configured to control the number of variable frequency coolers to be decreased when the variable frequency load shedding condition is met or to control the number of fixed frequency coolers to be decreased when the fixed frequency load shedding condition is met.
In the embodiment, the acquisition module acquires real-time parameters of equipment operation, and the judgment module judges whether the loading conditions are met according to the real-time parameters of the equipment operation, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions; the control module controls and increases the opening of the variable frequency refrigerator when meeting the variable frequency loading condition, or controls and increases the opening of the fixed frequency refrigerator when meeting the fixed frequency loading condition, so that the energy efficiency of the machine room can be improved, the initial investment cost is reduced, and the recovery period is shortened.
An embodiment of the present invention provides an efficient machine room control system, as shown in fig. 6 and 7, which includes:
the high-efficiency machine room control device comprises at least one fixed-frequency cooler 03/04, at least one variable-frequency cooler 01/02 and the high-efficiency machine room control device in the embodiment, wherein the high-efficiency machine room control device controls the variable-frequency cooler 01/02 to be started when the variable-frequency loading condition is met, or controls the fixed-frequency cooler 03/04 to be started when the fixed-frequency loading condition is met.
Further, the method also comprises the following steps:
a cooling water pump, a cooling water pump corresponding valve 09/10/11/12, a chilled water pump, a cooling water pump corresponding valve 05/06/07/08, a cooling tower fan and a cooling tower fan valve.
The refrigeration starting process selects a variable frequency refrigerator 01/02 according to a principle of alternate rest, starts a water inlet electric valve 09/10 of a cooling side of the unit, and starts electric butterfly valves corresponding to 4 cooling tower fans according to a principle of load reduction of the cooling tower fans; after the valve is opened in place, starting a cooling water pump according to a principle of alternate rest, wherein the frequency is set to be 30 Hz; after the cooling water pump reaches the default frequency, an electric butterfly valve 05/06 at the outlet of the freezing side of the unit is started; and after the valve is opened in place in the previous step, starting a freezing water pump according to a principle of alternate rest, and setting the frequency as the starting frequency of the variable-frequency water pump to be 30 Hz. Judging whether the backwater temperature of the cooling main pipe is greater than the unit cooling backwater temperature protection lower limit of 12℃ + the cooling tower fan starting temperature deviation value of 2℃, if so, issuing and starting the cooling tower fan, and setting the frequency as the cooling tower variable frequency fan starting frequency of 30 Hz; otherwise, the fan is started after the conditions are met. After the water pump, the cooling tower fan and the valve are all opened in place, the frequency conversion cooler 01/02 to be opened is started, and the outlet water temperature is set to be 6 ℃.
After the refrigeration loading flow is started, selecting a refrigerator 01/02/03/04 to be started; starting a cooling water pump according to a principle of alternate rest, wherein the frequency is consistent with that of the operated cooling water pump; starting a cooling tower fan according to the load increasing and reducing principle of the cooling tower fan, wherein the frequency is consistent with that of the cooling tower fan which is already operated; opening an electric butterfly valve 09/10/11/12 at the cooling side of the unit to be started and an electric valve corresponding to a fan of the cooling tower; opening an electric valve 05/06/07/08 at the outlet of the freezing side of the unit to be opened; after the water pump, the fan and the valve are all opened in place, the cold machine 01/02/03/04 to be opened is started, and the water outlet temperature setting is consistent with that of the operated machine set.
After the refrigeration load shedding flow is started, a command of closing one running unit 01/02/03/04 is issued; after the unit is closed, a command of closing one refrigerating water pump is issued according to the alternate rest principle, and after the refrigerating water pump is closed, the electric valve 05/06/07/08 corresponding to the refrigerating side of the unit is closed; switching off a cooling water pump according to a principle of alternate rest, and switching off the cooling water pump in place; closing the unit cooling side electric valve 09/10/11/12; closing an electric valve of a cooling tower fan according to the load increasing and reducing principle of the cooling tower; and after the electric valve in the previous step is closed, closing the cooling tower fan.
The refrigeration closing process is to issue commands for closing all the units 01, 02, 03 and 04; after the unit is closed, issuing a command of closing all the refrigeration water pumps; after the freezing water pump is closed, sending a command of closing all cooling water pumps; after the cooling water pump is closed, all cooling tower fans are closed; after the equipment is closed, closing refrigeration side electric valves (05, 06, 07 and 08), cooling side electric valves (09, 10, 11 and 12) and cooling tower fan valves; and after all the equipment are closed in place, the closing process of the refrigerating system is finished.
An embodiment of the present invention provides a central air conditioner, including: the efficient machine room control system is described in the above embodiment.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can obtain other products in various forms without departing from the spirit of the present invention, but any changes in shape or structure can be made within the scope of the present invention with the same or similar technical solutions as those of the present invention.
Claims (27)
1. An efficient machine room control method is characterized by comprising the following steps:
acquiring real-time operation parameters of equipment;
judging whether loading conditions are met or not according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
and controlling to increase the opening of the variable frequency refrigerator when the variable frequency loading condition is met or controlling to increase the opening of the fixed frequency refrigerator when the fixed frequency loading condition is met.
2. The efficient machine room control method according to claim 1, further comprising, before obtaining the real-time parameters of the operation of the equipment:
when the starting equipment is used for refrigerating, the variable-frequency refrigerator is started preferentially.
3. The efficient machine room control method according to claim 2, wherein the preferentially starting the variable frequency cooler comprises:
and starting the corresponding variable-frequency cooler according to the alternate rest principle.
4. The efficient machine room control method according to claim 1, wherein the variable frequency loading condition comprises:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
moreover, the number of the variable frequency coolers can be opened is more than or equal to 1;
and the average load rate of the running variable frequency refrigerator is more than or equal to the set value of the load of the variable frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the load temperature deviation value of the variable-frequency cooler;
and the average load rate of the running variable-frequency refrigerator is more than or equal to the set value of the loading load of the variable-frequency unit within the continuous preset time period, and the water supply temperature of the main freezing pipe is more than or equal to the set value of the water outlet temperature of the main freezing pipe plus the offset value of the loading temperature of the variable-frequency refrigerator.
5. The efficient machine room control method according to claim 1, wherein the constant frequency loading condition comprises:
the running time of the started cold machine is more than or equal to the loading interval time of the cold machine;
the number of the openable fixed-frequency coolers is more than or equal to 1, and the number of the openable variable-frequency coolers is less than 1;
and the average load rate of the running fixed-frequency cooler is more than or equal to the set load loading value of the fixed-frequency unit;
the water supply temperature of the freezing main pipe is more than or equal to the set value of the water outlet temperature of the freezing main pipe and the offset value of the loading temperature of the fixed frequency refrigerator;
and the average load rate of the running fixed-frequency refrigerator is more than or equal to the set loading load value of the fixed-frequency unit within the continuous preset time period, and the water supply temperature of the freezing main pipe is more than or equal to the set water outlet temperature value of the freezing main pipe and the offset value of the loading temperature of the fixed-frequency refrigerator.
6. The efficient machine room control method according to claim 1, wherein the controlling of increasing the turning-on of the variable frequency chiller when the variable frequency loading condition is met or the controlling of increasing the turning-on of the fixed frequency chiller when the fixed frequency loading condition is met comprises:
sequentially starting a cooling water pump, a chilled water pump and a cooling tower fan;
judging whether the cooling water pump, the chilled water pump and the cooling tower fan reach preset operating frequency or not;
if yes, starting the refrigerator with long running time according to the running time of the equipment.
7. The efficient machine room control method according to claim 6, wherein the sequentially starting the cooling water pump, the chilled water pump and the cooling tower fan comprises:
when equipment is started for refrigeration, a cooling water pump is started;
judging whether the operating frequency of the cooling water pump meets a preset first frequency threshold value or not;
if yes, starting a freezing water pump;
judging whether the operating frequency of the cooling water pump meets a preset second frequency threshold value or not;
if so, judging whether the return water temperature of the cooling main pipe is greater than the sum of the protection lower limit of the cooling return water temperature of the unit and the starting temperature deviation value of the fan of the cooling tower;
if yes, a fan of the cooling tower is started.
8. The efficient machine room control method according to claim 7, further comprising:
and starting a corresponding cooling water pump, a refrigerating water pump and a cooling tower fan according to the principle of alternate rest.
9. The efficient machine room control method according to claim 7, further comprising:
before the equipment is opened, the corresponding valve of the equipment is opened.
10. The efficient machine room control method according to claim 1, further comprising:
and setting the water outlet temperature of the corresponding cold machine opened by loading to be the same as the water outlet temperature of the cold machine opened before loading.
11. The efficient machine room control method according to claim 1, further comprising:
and resetting the outlet water temperature of the cold machine when the cold machine outlet water temperature resetting condition is met.
12. The efficient machine room control method according to claim 11, wherein the satisfying of the cold machine outlet water temperature reset condition comprises:
the number of running cold machines is less than or equal to 2;
in addition, the water outlet temperature resetting delay time period of the continuous cooler meets the conditions that the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the water outlet temperature resetting water pump frequency adjusting value of the continuous cooler;
in addition, the water outlet temperature resetting delay time period of the continuous cold machine meets the condition that the temperature difference of the water supply and the return of the freezing main pipe is less than the set value of the temperature difference of the water supply and the return of the freezing main pipe-a first set deviation value of the temperature difference of the water supply and the return of the freezing main pipe;
in addition, the water outlet temperature of the continuous cooler meets the requirement that the outdoor wet bulb temperature is less than the wet bulb temperature of the indoor design parameter within the reset delay time period;
and controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
13. The efficient machine room control method according to claim 12, further comprising, after increasing the temperature of the chiller effluent:
judging whether the frequency of the freezing variable-frequency water pump is less than the minimum frequency of the variable-frequency water pump and the frequency adjusting value of the water pump is reset according to the water outlet temperature resetting time interval of the cold machine, and meeting the requirement that the temperature difference of the supply and return water of the freezing main pipe is less than the temperature difference set value of the supply and return water of the freezing main pipe-the first set deviation value of the temperature difference of the supply and return water of the freezing main pipe within the water outlet temperature resetting delay time interval of the continuous cold machine;
and if so, controlling the outlet water temperature of the cold machine to increase the outlet water temperature of the cold machine according to a preset increasing gradient.
14. The efficient machine room control method according to claim 11, wherein the satisfying of the cold machine outlet water temperature reset condition comprises:
judging whether the condition of reducing the water outlet temperature of the refrigerator is met or not according to the water outlet temperature resetting time interval of the refrigerator, wherein the condition of reducing the water outlet temperature of the refrigerator comprises that the frequency of a freezing water pump is greater than the maximum frequency of a variable-frequency water pump and the frequency adjusting value of the water outlet temperature resetting water pump are met within the water outlet temperature resetting delay time period of the continuous refrigerator, and the water supply and return temperature difference of a freezing main pipe is greater than the set value of the water supply and return temperature difference of the freezing main pipe and the second set deviation value of the water supply and return temperature difference of the freezing main pipe;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
15. The efficient machine room control method according to claim 12, further comprising, after reducing the chiller leaving water temperature:
judging whether the frequency of a freezing water pump is larger than the maximum frequency of a variable-frequency water pump or not at intervals of the cold machine water outlet temperature resetting time interval, and judging whether the water outlet temperature resetting water pump frequency adjusting value meets the requirements of the frequency of the freezing water pump, the maximum frequency of the variable-frequency water pump, the cold machine water outlet temperature resetting water pump frequency adjusting value, and the main freezing pipe water supply and return temperature difference is larger than the main freezing pipe water supply and return temperature difference set value and the main freezing pipe water supply and return temperature difference set deviation value;
and if so, controlling the outlet water temperature of the cold machine to reduce the outlet water temperature of the cold machine according to a preset reduction gradient.
16. The efficient machine room control method according to any one of claims 12 to 15, wherein the cooler outlet water temperature reset value is between a cooler outlet water temperature reset lower limit value and a cooler outlet water temperature reset upper limit value.
17. The control method for the high-efficiency machine room according to any one of claims 12 to 15, wherein the set value of the outlet water temperature of the freezing main pipe is the set value of the return water temperature of the freezing main pipe-the set value of the outlet water temperature of the running cooler.
18. The efficient machine room control method according to claim 1, further comprising:
judging whether a load shedding condition is met or not according to the equipment operation real-time parameters, wherein the load shedding condition comprises a fixed-frequency load shedding condition and a variable-frequency load shedding condition;
and controlling to reduce the starting number of the variable frequency coolers when the variable frequency load shedding condition is met or controlling to reduce the starting number of the fixed frequency coolers when the fixed frequency load shedding condition is met.
19. The efficient machine room control method of claim 18, wherein the variable frequency deloading condition comprises:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
moreover, the starting number of the fixed frequency coolers is less than 1;
the average load of the running unit is less than the set value of the load reduction load of the variable frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the load reduction temperature deviation value of the variable-frequency refrigerator;
and the average load of the running unit is less than the set value of the load reduction load of the variable-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the variable-frequency refrigerator are met in a continuous preset time period.
20. The efficient machine room control method of claim 17, wherein the constant frequency deloading condition comprises:
the running time of the started cold machine is more than or equal to the load reduction interval time of the cold machine;
the average load of the running unit is less than the set value of the load reduction load of the fixed-frequency unit (the number of running units is-1)/the number of running units;
the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator-the load reduction temperature deviation value of the fixed-frequency refrigerator;
and the average load of the running unit is less than the set value of the load shedding load of the fixed-frequency unit (unit running number-1)/the running number of the unit, and the water supply temperature of the freezing main pipe is less than the set value of the water outlet temperature of the running refrigerator and the offset value of the load shedding temperature of the fixed-frequency refrigerator are met in a continuous preset time period.
21. The method for controlling the efficient machine room according to claim 17, wherein after controlling the frequency-variable cooler to be turned off or controlling the fixed frequency cooler to be turned off, the method further comprises:
and closing the freezing water pump, the cooling water pump and the cooling tower fan in sequence.
22. The efficient machine room control method of claim 14, further comprising:
and before closing the equipment, closing the corresponding valve of the equipment.
23. The efficient machine room control method of claim 1, wherein the equipment operation real-time parameters comprise:
one or more of the running time of the started refrigerator, the average load of the running unit, the water supply temperature of the freezing main pipe and the temperature and humidity value of the outdoor environment.
24. An efficient machine room control device, comprising:
the acquisition module is used for acquiring real-time operation parameters of the equipment;
the judging module is used for judging whether loading conditions are met according to the equipment operation real-time parameters, wherein the loading conditions comprise fixed-frequency loading conditions and variable-frequency loading conditions;
and the control module is used for controlling the starting of the frequency conversion cold machine when the frequency conversion loading condition is met or controlling the starting of the fixed frequency cold machine when the frequency conversion loading condition is met.
25. An efficient machine room control system, comprising:
the system comprises at least one fixed-frequency cooler, at least one variable-frequency cooler and the high-efficiency machine room control device according to claim 24, wherein the high-efficiency machine room control device controls the variable-frequency cooler to be started when the variable-frequency loading condition is met or controls the fixed-frequency cooler to be started when the fixed-frequency loading condition is met.
26. The efficient room control system of claim 25, further comprising:
the cooling water pump, the cooling water pump corresponding valve, the chilled water pump, the cooling water pump corresponding valve, the cooling tower fan and the cooling tower fan valve.
27. A central air conditioner, comprising: an efficient room control system as claimed in claim 25 or 26.
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