CN114198832A - Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method - Google Patents
Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method Download PDFInfo
- Publication number
- CN114198832A CN114198832A CN202111570434.1A CN202111570434A CN114198832A CN 114198832 A CN114198832 A CN 114198832A CN 202111570434 A CN202111570434 A CN 202111570434A CN 114198832 A CN114198832 A CN 114198832A
- Authority
- CN
- China
- Prior art keywords
- water pump
- variable
- frequency water
- air conditioning
- pressure difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system, a constant-current energy-saving control method and a variable-current energy-saving control method, and relates to the technical field of air conditioners. The air conditioning system comprises a variable frequency water pump, a cold and warm water manufacturing device, a bypass valve, a pressure difference detection piece and a plurality of air conditioning branches; the variable frequency water pump, the cold and warm water manufacturing device and the bypass valve are sequentially connected end to end through pipelines to form a closed loop, and a plurality of air conditioner branches are all arranged at two ends of the bypass valve in parallel; the pressure difference detection pieces are arranged at two ends of the variable-frequency water pump in parallel and used for detecting the pressure difference at the two ends of the variable-frequency water pump; the air conditioners and the temperature regulating valves are arranged on the air conditioner branches in series, and the temperature regulating valves are provided with self-adaptive switches capable of automatically regulating the opening degrees according to the pressure difference at the two ends of the corresponding temperature regulating valves. The air conditioning system provided by the invention can reduce the energy consumption of the variable frequency water pump along with the reduction of the load of the air conditioner, and the user experience is better.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system, a constant-current energy-saving control method and a variable-current energy-saving control method.
Background
At present, an air conditioning system applied to the market is provided with a fixed-frequency water pump, and under the condition that the load of an air conditioner is changed, the flow of the system is ensured to be constant by adjusting the opening of a bypass valve.
Under the condition that the load of the air conditioner is reduced, the fixed-frequency water pump still maintains the rated rotating speed, unnecessary energy consumption is generated, the use cost of a user is overhigh, and the user experience is influenced.
Disclosure of Invention
The invention solves the problems that the existing air-conditioning system water pump generates unnecessary energy consumption and the user experience is poor.
In order to solve the above problems, the present invention provides an air conditioning system, which can reduce the energy consumption of a variable frequency water pump with the reduction of the load of the air conditioner, and the user experience is better.
The embodiment of the invention provides an air conditioning system, which comprises a variable frequency water pump, a cold and warm water manufacturing device, a bypass valve, a pressure difference detection piece and a plurality of air conditioning branches;
the variable frequency water pump, the cold and warm water manufacturing device and the bypass valve are sequentially connected end to end through pipelines to form a closed loop, and a plurality of air conditioner branches are arranged at two ends of the bypass valve in parallel;
the pressure difference detection pieces are arranged at two ends of the variable-frequency water pump in parallel and used for detecting the pressure difference at two ends of the variable-frequency water pump;
the air conditioner and the temperature regulating valves are arranged on the air conditioner branches in series, and the temperature regulating valves are provided with self-adaptive switches capable of automatically regulating the opening degrees according to the corresponding pressure difference at two ends of the temperature regulating valves.
In practical application, if the load of the air conditioner is reduced, the opening of the bypass valve is increased, and the opening of each adaptive switch is changed, so that the sum of the pressure loss of the air conditioner on each air conditioning branch and the pressure loss of the temperature regulating valve is equal. When the opening degree of one self-adaptive switch reaches the maximum, the load of the corresponding air conditioner is characterized to be the maximum, at the moment, the pressure loss of the air conditioner is the round-trip pressure difference of the whole loop and is equal to the difference between the pressure difference of the variable-frequency water pump and the pressure loss of the cold-warm water manufacturing device, and therefore the target rotating speed of the water pump after reduction can be obtained through the value of the pressure difference detection piece and the preset constant flow at the moment. Under the condition of reducing the rotating speed of the variable frequency water pump to the target rotating speed, the pressure loss of the air conditioner with the maximum load corresponds to the pressure difference when the variable frequency water pump maintains the constant flow, namely, the system can normally operate, the rotating speed of the variable frequency water pump is reduced, the power consumed by the variable frequency water pump is reduced, and the energy consumption is reduced. Therefore, the air conditioning system provided by the embodiment of the invention can reduce the energy consumption of the variable frequency water pump along with the reduction of the load of the air conditioner, and the user experience is better.
In an optional embodiment, the air conditioning system further includes a rotation speed adjusting device, the rotation speed adjusting device is electrically connected to the variable frequency water pump and the pressure difference detecting element, and the rotation speed adjusting device is configured to adjust a rotation speed of the variable frequency water pump according to a detection result of the pressure difference detecting element, so that a flow rate of the variable frequency water pump is kept constant.
In an optional embodiment, the air conditioning system further includes an opening degree adjusting device electrically connected to the plurality of adaptive switches and the bypass valve, respectively, and configured to adjust an opening degree of the bypass valve when a total load of the plurality of air conditioners changes, and stop the adjustment until one of the plurality of adaptive switches reaches a maximum opening degree.
In an optional embodiment, the air conditioning system further includes a rotation speed adjusting device and an opening adjusting device, the rotation speed adjusting device is electrically connected to the variable frequency water pump, the differential pressure detecting element, the opening adjusting device and the plurality of adaptive switches, the opening adjusting device is electrically connected to the bypass valve, the rotation speed adjusting device is configured to adjust the rotation speed of the variable frequency water pump when a total load of the plurality of air conditioners changes, and stop the rotation speed until one of the plurality of adaptive switches reaches a maximum opening, and the opening adjusting device is configured to control the bypass valve to be kept fully closed when a flow rate of the variable frequency water pump is within a preset flow rate interval.
In an optional embodiment, the opening degree adjusting device is further configured to, when the flow rate of the variable-frequency water pump is smaller than the lower limit value of the preset interval, adjust the opening degree of the bypass valve until one of the plurality of adaptive switches reaches a maximum opening degree, and the rotation speed adjusting device is further configured to adjust the rotation speed of the variable-frequency water pump according to the detection result of the differential pressure detecting element, so that the flow rate of the variable-frequency water pump and the lower limit value of the preset interval are kept equal.
The invention also provides a constant-current energy-saving control method, which is applied to an air conditioning system, wherein the air conditioning system comprises a variable-frequency water pump, a cold-warm water manufacturing device, a bypass valve, a pressure difference detection piece and a plurality of air conditioning branches, the variable-frequency water pump, the cold-warm water manufacturing device and the bypass valve are sequentially connected end to end through pipelines to form a closed loop, the plurality of air conditioning branches are all arranged at two ends of the bypass valve in parallel, the pressure difference detection piece is arranged at two ends of the variable-frequency water pump in parallel, an air conditioner and a temperature regulating valve are arranged on the plurality of air conditioning branches in series, and a plurality of temperature regulating valves are all provided with self-adaptive switches capable of automatically regulating opening degrees according to the pressure differences at two ends of the corresponding temperature regulating valves, the constant-current energy-saving control method comprises the following steps:
when the total load of a plurality of air conditioners is changed, the opening of the bypass valve is adjusted until one of a plurality of self-adaptive switches reaches the maximum opening;
and acquiring the water pump pressure difference detected by the pressure difference detection piece, and adjusting the rotating speed of the variable frequency water pump to a target rotating speed according to the water pump pressure difference and the performance curve of the variable frequency water pump so as to keep the flow of the variable frequency water pump constant.
In an alternative embodiment, the step of adjusting the opening of the bypass valve when the total load of the plurality of air conditioners is changed until one of the plurality of adaptive switches reaches a maximum opening includes:
and gradually increasing the opening of the bypass valve when the total load of the plurality of air conditioners is reduced until one of the plurality of adaptive switches reaches a maximum opening.
The invention also provides a variable-flow energy-saving control method which is applied to an air conditioning system, wherein the air conditioning system comprises a variable-frequency water pump, a cold-warm water manufacturing device, a bypass valve, a pressure difference detection piece and a plurality of air conditioning branches, the variable-frequency water pump, the cold-warm water manufacturing device and the bypass valve are sequentially connected end to end through pipelines to form a closed loop, the plurality of air conditioning branches are all arranged at two ends of the bypass valve in parallel, the pressure difference detection piece is arranged at two ends of the variable-frequency water pump in parallel, an air conditioner and a temperature regulating valve are arranged on the plurality of air conditioning branches in series, and a self-adaptive switch capable of automatically regulating the opening degree according to the pressure difference at two ends of the corresponding temperature regulating valve is arranged on each temperature regulating valve, the variable-flow energy-saving control method comprises the following steps:
when the total load of a plurality of air conditioners changes, the rotating speed of the variable frequency water pump is adjusted until one of the self-adaptive switches reaches the maximum opening degree, and a first target rotating speed is obtained;
acquiring a first water pump pressure difference detected by the pressure difference detection piece, and obtaining a first flow of the variable frequency water pump according to the first water pump pressure difference and the first target rotating speed;
comparing the first flow with a preset flow interval;
and if the first flow rate is in the flow rate interval, controlling the bypass valve to keep fully closed.
In an optional embodiment, when the total load of the plurality of air conditioners changes, the step of adjusting the rotation speed of the variable frequency water pump until one of the plurality of adaptive switches reaches the maximum opening degree stops, and obtaining the first target rotation speed includes:
and under the condition that the total load of the plurality of air conditioners is reduced, gradually reducing the rotating speed of the variable-frequency water pump until one of the plurality of self-adaptive switches reaches the maximum opening degree, and obtaining the first target rotating speed.
In an optional embodiment, after the step of comparing the first flow rate with a preset flow rate interval, the variable flow energy saving control method further includes:
if the first flow is smaller than the lower limit value of the flow interval, gradually increasing the opening of the bypass valve until one of the plurality of self-adaptive switches reaches the maximum opening;
acquiring a second water pump differential pressure detected by the differential pressure detection piece, and obtaining a second target rotating speed according to the second water pump differential pressure, the lower limit value of the flow interval and the performance curve of the variable-frequency water pump;
and adjusting the rotating speed of the variable-frequency water pump to the second target rotating speed so as to keep the flow of the variable-frequency water pump equal to the lower limit value of the flow interval.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a flow chart of a constant-current energy-saving control method according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioning system according to a second embodiment of the present invention;
fig. 4 is a flowchart of a variable current energy saving control method according to a second embodiment of the present invention.
Description of reference numerals:
100-an air conditioning system; 110-variable frequency water pump; 120-cold and warm water manufacturing device; 130-a bypass valve; 140-differential pressure sensing member; 150-air conditioning branch; 151-air conditioner; 152-a thermostatic regulating valve; 153-adaptive switches; 160-rotational speed regulating device; 170-opening degree adjusting device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioning system 100 according to a first embodiment of the present invention.
The air conditioning system 100 provided by the embodiment includes a variable frequency water pump 110, a cold and warm water manufacturing device 120, a bypass valve 130, a pressure difference detection element 140, and a plurality of air conditioning branches 150; the variable frequency water pump 110, the cold and warm water manufacturing device 120 and the bypass valve 130 are sequentially connected end to end through pipelines to form a closed loop, and a plurality of air conditioner branches 150 are all arranged at two ends of the bypass valve 130 in parallel; the pressure difference detection part 140 is arranged at two ends of the variable frequency water pump 110 in parallel and is used for detecting the pressure difference at two ends of the variable frequency water pump 110; each of the plurality of air conditioning branches 150 is provided with an air conditioner 151 and a thermostatic valve 152 in series, and each of the thermostatic valves 152 is provided with an adaptive switch 153 capable of automatically adjusting an opening degree in accordance with a differential pressure between both ends of the corresponding thermostatic valve 152.
In this embodiment, the air conditioning system 100 further includes a rotation speed adjusting device 160 and an opening adjusting device 170, the opening adjusting device 170 is electrically connected to the plurality of adaptive switches 153 and the bypass valve 130, respectively, and the opening adjusting device 170 is configured to adjust the opening of the bypass valve 130 until one of the plurality of adaptive switches 153 reaches a maximum opening when the total load of the plurality of air conditioners 151 changes. The rotation speed adjusting device 160 is electrically connected to the variable frequency water pump 110 and the differential pressure detecting element 140, and the rotation speed adjusting device 160 is configured to adjust the rotation speed of the variable frequency water pump 110 according to the detection result of the differential pressure detecting element 140, so as to keep the flow rate of the variable frequency water pump 110 constant.
In other embodiments, a controller may be used to integrate the functions of the speed regulator 160 and the opening regulator 170, that is, a controller is electrically connected to the plurality of adaptive switches 153, the bypass valve 130, the variable frequency water pump 110, and the differential pressure detector 140. When the total load of the plurality of air conditioners 151 changes, the controller adjusts the opening degree of the bypass valve 130 until one of the plurality of adaptive switches 153 reaches the maximum opening degree, and thereafter, the controller adjusts the rotation speed of the variable frequency water pump 110 based on the detection result of the differential pressure detecting element 140 so as to keep the flow rate of the variable frequency water pump 110 constant.
In practical applications, when the total load of the plurality of air conditioners 151 decreases, the opening degree of the bypass valve 130 increases, and the opening degrees of the respective adaptive switches 153 change so as to ensure that the sum of the pressure loss of the air conditioners 151 and the pressure loss of the thermostatic regulating valve 152 in each air conditioning branch 150 becomes equal. When the opening of one of the adaptive switches 153 reaches the maximum, it indicates that the load of the corresponding air conditioner 151 is maximum, and the adjustment of the opening of the bypass valve 130 is stopped.
At this time, the pressure loss of the air conditioner 151 corresponding to the maximum opening degree adaptive switch 153 is the round-trip pressure difference of the entire circuit, and is equal to the difference between the pressure difference of the variable frequency water pump 110 and the pressure loss of the cold and warm water producing apparatus 120, and therefore, the target rotational speed after the reduction of the variable frequency water pump 110 can be obtained by the value of the pressure difference detecting element 140 and the preset constant flow rate at this time. When the rotation speed of the variable frequency water pump 110 is reduced to the target rotation speed, the pressure loss of the maximum load air conditioner 151 corresponds to the pressure difference when the variable frequency water pump 110 maintains a constant flow rate, that is, the system can normally operate, the rotation speed of the variable frequency water pump 110 is reduced, the power consumed by the variable frequency water pump 110 is reduced, and the energy consumption is reduced.
When the opening degrees of the plurality of adaptive switches 153 corresponding to the plurality of air conditioners 151 reach the maximum simultaneously during the adjustment of the opening degree of the bypass valve 130, the load indicating that the plurality of air conditioners 151 corresponding to the plurality of air conditioners 151 are the same and the maximum is also applied, and in this case, the bypass valve 130 is similarly controlled to stop the adjustment of the opening degree. The pressure loss of one of the air conditioners 151 is the round-trip pressure difference of the whole circuit, which is equal to the difference between the pressure difference of the variable frequency water pump 110 and the pressure loss of the cold/warm water producing apparatus 120, and therefore, the target rotation speed of the water pump after the water pump is lowered can be obtained by the value of the pressure difference detecting element 140 and the preset constant flow rate.
The first embodiment of the present invention further provides a constant-current energy-saving control method, which is applied to the air conditioning system 100 provided in the first embodiment, fig. 2 is a flow chart of the constant-current energy-saving control method, and please refer to fig. 2, where the constant-current energy-saving control method provided in this embodiment includes the following steps:
in step S101, when the total load of the plurality of air conditioners 151 changes, the opening degree of the bypass valve 130 is adjusted until one of the plurality of adaptive switches 153 reaches the maximum opening degree.
When the total load of the plurality of air conditioners 151 is reduced, the total flow rate required by the plurality of air conditioning branches 150 is reduced, the opening degree of the bypass valve 130 is gradually increased, the opening degrees of the plurality of adaptive switches 153 on the plurality of air conditioning branches 150 are changed, the return differential pressure of the circuit is gradually reduced, and when one of the adaptive switches 153 is fully opened, that is, when the maximum opening degree is reached, the adjustment of the opening degree of the bypass valve 130 is stopped.
Step S102, acquiring the water pump pressure difference detected by the pressure difference detection part 140, and adjusting the rotating speed of the variable frequency water pump 110 to a target rotating speed according to the water pump pressure difference and the performance curve of the variable frequency water pump 110 so as to keep the flow of the variable frequency water pump 110 constant.
When the fully-opened self-adaptive switch 153 appears, the value of the pressure difference detection element 140 and the preset constant flow are brought into the performance curve of the variable frequency water pump 110, and the reduced target rotating speed of the variable frequency water pump 110 can be obtained. When the rotation speed of the variable frequency water pump 110 is reduced to the target rotation speed, the pressure loss of the maximum load air conditioner 151 corresponds to the pressure difference when the variable frequency water pump 110 maintains a constant flow rate, that is, the system can normally operate, the rotation speed of the variable frequency water pump 110 is reduced, and the energy consumption of the variable frequency water pump 110 is reduced.
Therefore, the air conditioning system 100 and the constant-current energy-saving control method provided by the first embodiment of the invention can reduce the energy consumption of the variable-frequency water pump 110 with the reduction of the load of the air conditioner 151, thereby saving the use cost and providing better user experience.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an air conditioning system 100 according to a second embodiment of the present invention.
The air conditioning system 100 provided by the embodiment includes a variable frequency water pump 110, a cold and warm water manufacturing device 120, a bypass valve 130, a pressure difference detection element 140, and a plurality of air conditioning branches 150; the variable frequency water pump 110, the cold and warm water manufacturing device 120 and the bypass valve 130 are sequentially connected end to end through pipelines to form a closed loop, and a plurality of air conditioner branches 150 are all arranged at two ends of the bypass valve 130 in parallel; the pressure difference detection part 140 is arranged at two ends of the variable frequency water pump 110 in parallel and is used for detecting the pressure difference at two ends of the variable frequency water pump 110; each of the plurality of air conditioning branches 150 is provided with an air conditioner 151 and a thermostatic valve 152 in series, and each of the thermostatic valves 152 is provided with an adaptive switch 153 capable of automatically adjusting an opening degree in accordance with a differential pressure between both ends of the corresponding thermostatic valve 152.
In this embodiment, the air conditioning system 100 further includes a rotation speed adjusting device 160 and an opening adjusting device 170, the rotation speed adjusting device 160 is electrically connected to the variable frequency water pump 110, the pressure difference detecting element 140, the opening adjusting device 170, and the plurality of adaptive switches 153, the opening adjusting device 170 is electrically connected to the bypass valve 130, the rotation speed adjusting device 160 is configured to adjust the rotation speed of the variable frequency water pump 110 when the total load of the plurality of air conditioners 151 changes, and stop until one of the plurality of adaptive switches 153 reaches a maximum opening, and the opening adjusting device 170 is configured to control the bypass valve 130 to be kept fully closed when the flow rate of the variable frequency water pump 110 is within a preset flow rate interval.
The opening degree adjusting device 170 is further configured to adjust the opening degree of the bypass valve 130 when the flow rate of the variable-frequency water pump 110 is smaller than the lower limit value of the preset interval, and stop the operation until one of the plurality of adaptive switches 153 reaches the maximum opening degree, and the rotating speed adjusting device 160 is further configured to adjust the rotating speed of the variable-frequency water pump 110 according to the detection result of the differential pressure detecting element 140, so that the flow rate of the variable-frequency water pump 110 is equal to the lower limit value of the flow rate interval.
In practical applications, the air conditioning system 100 is preset with a flow rate interval, when the total load of the air conditioner 151 is reduced, the rotation speed adjusting device 160 gradually decreases the rotation speed of the variable-frequency water pump 110, during which the opening degrees of the plurality of adaptive switches 153 are adaptively changed, and when one of the plurality of adaptive switches 153 reaches the maximum opening degree, the continuous decrease of the rotation speed of the variable-frequency water pump 110 is stopped.
At this time, the load of the air conditioner 151 corresponding to the adaptive switch 153 is the maximum load, and the pressure loss of the air conditioner 151 is equal to the return differential pressure of the circuit, that is, the sum of the pressure loss of the air conditioner 151 on the remaining air conditioning branch 150 and the pressure loss of the corresponding thermostat 152, and also equal to the difference between the differential pressure of the inverter water pump 110 and the differential pressure of the cold/warm water producing apparatus 120. And according to the rotating speed of the variable-frequency water pump 110 at the moment and the numerical value of the pressure difference detection part 140, bringing the rotating speed and the numerical value into a performance curve of the variable-frequency water pump 110 to obtain the flow of the variable-frequency water pump 110 at the moment.
Comparing the current flow of the water pump with a preset flow interval, if the current flow is in the flow interval, the normal operation of the air conditioning system 100 is met, the opening adjusting device 170 controls the bypass valve 130 to be kept completely closed, and the current rotating speed of the variable frequency water pump 110 is the minimum rotating speed meeting the current load, namely the energy consumption of the variable frequency water pump 110 is the minimum. If the flow rate of the variable frequency water pump 110 is smaller than the lower limit value of the flow rate interval, that is, the air conditioning system 100 cannot operate normally, at this time, the opening degree adjusting device 170 gradually increases the opening degree of the bypass valve 130, the opening degrees of the plurality of adaptive switches 153 change with each other, and when the opening degree of one of the adaptive switches 153 reaches the maximum, the adjustment of the opening degree of the bypass valve 130 is stopped. Then, the lower limit value of the current numerical value and the flow interval of the pressure difference detection part 140 is brought into the performance curve of the variable frequency water pump 110, so as to obtain the target rotating speed of the variable frequency water pump 110, the target rotating speed is the minimum rotating speed meeting the lower limit value of the flow interval, and when the rotating speed of the variable frequency water pump 110 is adjusted to the target rotating speed, the pressure loss of the maximum load air conditioner 151 corresponds to the pressure difference of the variable frequency water pump 110 maintaining the minimum allowable flow, so that the system can normally operate, and the energy consumption of the variable frequency water pump 110 is reduced.
Similarly, in other embodiments, a single controller may be used to integrate the functions of the rotation speed adjusting device 160 and the opening degree adjusting device 170, that is, the single controller may be electrically connected to the plurality of adaptive switches 153, the bypass valve 130, the variable frequency water pump 110, and the differential pressure detecting element 140.
A second embodiment of the present invention further provides a variable flow energy-saving control method, which is applied to the air conditioning system 100 provided in the second embodiment, fig. 4 is a flow chart of the variable flow energy-saving control method, and please refer to fig. 4, where the variable flow energy-saving control method provided in this embodiment includes the following steps:
in step S201, when the total load of the plurality of air conditioners 151 changes, the rotation speed of the variable frequency water pump 110 is adjusted until one of the plurality of adaptive switches 153 reaches the maximum opening degree, and the first target rotation speed is obtained.
Step S202, a first water pump pressure difference detected by the pressure difference detecting part 140 is obtained, and a first flow rate of the variable frequency water pump 110 is obtained according to the first water pump pressure difference and the first target rotation speed.
Step S203, comparing the first flow rate with a preset flow rate interval.
In step S204, if the first flow rate is within the flow rate range, the bypass valve 130 is controlled to be fully closed.
In step S205, if the first flow rate is smaller than the lower limit value of the flow rate interval, the opening degree of the bypass valve 130 is gradually increased until one of the plurality of adaptive switches 153 reaches the maximum opening degree.
Step S206, acquiring a second water pump differential pressure detected by the differential pressure detection piece 140, and obtaining a second target rotating speed according to the second water pump differential pressure, the lower limit value of the flow interval and the performance curve of the variable frequency water pump 110;
and step S207, adjusting the rotating speed of the variable-frequency water pump 110 to a second target rotating speed so as to enable the flow of the variable-frequency water pump 110 to be equal to the lower limit value of the flow interval.
In practical application, the air conditioning system 100 is preset with a flow interval, when the total load of the plurality of air conditioners 151 is reduced, the rotation speed of the variable frequency water pump 110 is gradually reduced, in the process, the opening degrees of the plurality of adaptive switches 153 are adaptively changed, when one of the plurality of adaptive switches 153 reaches the maximum opening degree, the continuous reduction of the rotation speed of the variable frequency water pump 110 is stopped, and the rotation speed of the variable frequency water pump 110 at the moment is obtained as the first target rotation speed.
At this time, the load of the air conditioner 151 corresponding to the adaptive switch 153 is the maximum load, and the pressure loss of the air conditioner 151 is equal to the return differential pressure of the circuit, that is, the sum of the pressure loss of the air conditioner 151 on the remaining air conditioning branch 150 and the pressure loss of the corresponding thermostat 152, and also equal to the difference between the differential pressure of the inverter water pump 110 and the differential pressure of the cold/warm water producing apparatus 120. Therefore, the value of the pressure difference detection element 140 at this time is obtained to obtain a first water pump pressure difference, and the first water pump pressure difference and the first target rotation speed are brought into the performance curve of the variable frequency water pump 110 to obtain the flow rate of the variable frequency water pump 110 at this time, that is, the first flow rate.
And comparing the first flow with a preset flow interval, if the first flow is in the flow interval, the normal operation of the air conditioning system 100 is met, controlling the bypass valve 130 to be kept fully closed, and the first target rotating speed is the minimum rotating speed meeting the current load, namely the energy consumption of the variable frequency water pump 110 is the lowest. If the first flow rate is smaller than the lower limit value of the flow rate interval, that is, if the air conditioning system 100 cannot operate normally, the opening degree of the bypass valve 130 is gradually increased, the opening degrees of the plurality of adaptive switches 153 are changed again in a follow-up manner, and when the opening degree of one of the adaptive switches 153 reaches the maximum, the adjustment of the opening degree of the bypass valve 130 is stopped.
Then, obtaining a numerical value of the pressure difference detection part 140 to obtain a second water pump pressure difference, bringing a lower limit value of a range between the second water pump pressure difference and the flow rate into a performance curve of the variable frequency water pump 110 to obtain a second target rotating speed of the variable frequency water pump 110, wherein the second target rotating speed is a minimum rotating speed meeting the lower limit value of the flow rate range, and when the rotating speed of the variable frequency water pump 110 is adjusted to the second target rotating speed, the pressure loss of the maximum load air conditioner 151 corresponds to the pressure difference of the variable frequency water pump 110 maintaining the minimum allowable flow rate, that is, the system can normally operate, and the consumption energy consumption of the variable frequency water pump 110 is reduced.
Therefore, the air conditioning system 100 and the variable-flow energy-saving control method according to the second embodiment of the present invention can reduce the energy consumption of the variable-frequency water pump 110 with the reduction of the load of the air conditioner 151, thereby saving the use cost and providing better user experience.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An air conditioning system is characterized by comprising a variable frequency water pump (110), a cold and warm water manufacturing device (120), a bypass valve (130), a pressure difference detection piece (140) and a plurality of air conditioning branches (150);
the variable frequency water pump (110), the cold and warm water manufacturing device (120) and the bypass valve (130) are sequentially connected end to end through pipelines to form a closed loop, and the air conditioner branches (150) are all arranged at two ends of the bypass valve (130) in parallel;
the pressure difference detection piece (140) is arranged at two ends of the variable-frequency water pump (110) in parallel and is used for detecting the pressure difference at two ends of the variable-frequency water pump (110);
the air conditioners (151) and the temperature regulating valves (152) are all arranged on the air conditioner branches (150) in series, and the temperature regulating valves (152) are all provided with adaptive switches (153) capable of automatically adjusting opening degrees according to the pressure difference between the two ends of the corresponding temperature regulating valves (152).
2. The air conditioning system of claim 1, wherein the air conditioning system (100) further comprises a rotation speed adjusting device (160), the rotation speed adjusting device (160) is electrically connected to the variable frequency water pump (110) and the differential pressure detecting element (140), and the rotation speed adjusting device (160) is configured to adjust the rotation speed of the variable frequency water pump (110) according to the detection result of the differential pressure detecting element (140) so as to keep the flow rate of the variable frequency water pump (110) constant.
3. The air conditioning system according to claim 1, wherein the air conditioning system (100) further comprises an opening degree adjusting device (170), the opening degree adjusting device (170) being electrically connected to the plurality of adaptive switches (153) and the bypass valve (130), respectively, the opening degree adjusting device (170) being configured to adjust the opening degree of the bypass valve (130) when the total load of the plurality of air conditioners (151) changes, until one of the plurality of adaptive switches (153) reaches a maximum opening degree, and stop.
4. The air conditioning system according to claim 1, wherein the air conditioning system (100) further comprises a rotation speed adjusting device (160) and an opening degree adjusting device (170), the rotation speed adjusting device (160) is electrically connected to the variable frequency water pump (110), the differential pressure detecting member (140), the opening degree adjusting device (170) and the plurality of adaptive switches (153), the opening degree adjusting device (170) is electrically connected to the bypass valve (130), the rotation speed adjusting device (160) is configured to adjust the rotation speed of the variable frequency water pump (110) when the total load of the plurality of air conditioners (151) changes until one of the plurality of adaptive switches (153) reaches a maximum opening degree, the opening degree adjusting device (170) is configured to stop when the flow rate of the variable frequency water pump (110) is within a preset flow rate interval, controlling the bypass valve (130) to remain fully closed.
5. The air conditioning system according to claim 4, wherein the opening degree adjusting device (170) is further configured to adjust the opening degree of the bypass valve (130) until one of the plurality of adaptive switches (153) stops when the flow rate of the variable frequency water pump (110) is less than the lower limit value of the preset interval, and the rotation speed adjusting device (160) is further configured to adjust the rotation speed of the variable frequency water pump (110) according to the detection result of the differential pressure detecting member (140) so that the flow rate of the variable frequency water pump (110) is equal to the lower limit value of the preset interval.
6. The constant-current energy-saving control method is applied to an air conditioning system (100), and is characterized in that the air conditioning system (100) comprises a variable-frequency water pump (110), a cold and warm water manufacturing device (120), a bypass valve (130), a pressure difference detection piece (140) and a plurality of air conditioning branches (150), the variable-frequency water pump (110), the cold and warm water manufacturing device (120) and the bypass valve (130) are sequentially connected end to end through pipelines to form a closed loop, the air conditioning branches (150) are arranged at two ends of the bypass valve (130) in parallel, the pressure difference detection piece (140) is arranged at two ends of the variable-frequency water pump (110) in parallel, the air conditioning branches (150) are provided with an air conditioner (151) and a temperature regulating valve (152) in series, the temperature regulating valves (152) are provided with adaptive switches (153) capable of automatically regulating opening degrees according to the pressure difference at two ends of the corresponding temperature regulating valves (152), the constant-current energy-saving control method comprises the following steps: when the total load of a plurality of air conditioners (151) changes, adjusting the opening of the bypass valve (130) until one of a plurality of adaptive switches (153) reaches the maximum opening and stopping;
and acquiring the water pump pressure difference detected by the pressure difference detection piece (140), and adjusting the rotating speed of the variable-frequency water pump (110) to a target rotating speed according to the water pump pressure difference and the performance curve of the variable-frequency water pump (110) so as to keep the flow of the variable-frequency water pump (110) constant.
7. The constant-current energy-saving control method according to claim 6, wherein the step of adjusting the opening degree of the bypass valve (130) when the total load of the plurality of air conditioners (151) changes until one of the plurality of adaptive switches (153) reaches a maximum opening degree comprises:
when the total load of the plurality of air conditioners (151) is reduced, the opening degree of the bypass valve (130) is gradually increased until one of the plurality of adaptive switches (153) reaches a maximum opening degree.
8. A variable-flow energy-saving control method is applied to an air conditioning system (100), and is characterized in that the air conditioning system (100) comprises a variable-frequency water pump (110), a cold and warm water manufacturing device (120), a bypass valve (130), a pressure difference detection piece (140) and a plurality of air conditioning branches (150), the variable-frequency water pump (110), the cold and warm water manufacturing device (120) and the bypass valve (130) are sequentially connected end to end through pipelines to form a closed loop, the air conditioning branches (150) are all arranged at two ends of the bypass valve (130) in parallel, the pressure difference detection piece (140) is arranged at two ends of the variable-frequency water pump (110) in parallel, the air conditioning branches (150) are all provided with an air conditioner (151) and a temperature regulating valve (152) in series, the temperature regulating valves (152) are all provided with self-adaptive switches (153) capable of automatically regulating opening degrees according to the pressure difference at two ends of the corresponding temperature regulating valves (152), the variable-current energy-saving control method comprises the following steps: when the total load of the plurality of air conditioners (151) changes, the rotating speed of the variable-frequency water pump (110) is adjusted until one of the plurality of self-adaptive switches (153) reaches the maximum opening degree, and a first target rotating speed is obtained;
acquiring a first water pump pressure difference detected by the pressure difference detection piece (140), and obtaining a first flow of the variable-frequency water pump (110) according to the first water pump pressure difference and the first target rotating speed;
comparing the first flow with a preset flow interval;
and if the first flow rate is in the flow rate interval, controlling the bypass valve (130) to keep fully closed.
9. The variable-flow energy-saving control method according to claim 8, wherein when the total load of the plurality of air conditioners (151) changes, the step of adjusting the rotation speed of the variable-frequency water pump (110) until one of the plurality of adaptive switches (153) is stopped when reaching the maximum opening degree, and the step of obtaining the first target rotation speed comprises the steps of:
and gradually reducing the rotating speed of the variable-frequency water pump (110) under the condition that the total load of the air conditioners (151) is reduced until one of the adaptive switches (153) reaches the maximum opening degree, and obtaining the first target rotating speed.
10. The method of claim 8, wherein after the step of comparing the first flow rate with a preset flow rate interval, the method further comprises:
if the first flow rate is smaller than the lower limit value of the flow rate interval, gradually increasing the opening degree of the bypass valve (130) until one of the self-adaptive switches (153) reaches the maximum opening degree; acquiring a second water pump pressure difference detected by the pressure difference detection part (140), and obtaining a second target rotating speed according to the second water pump pressure difference, the lower limit value of the flow interval and the performance curve of the variable-frequency water pump (110);
and adjusting the rotating speed of the variable-frequency water pump (110) to the second target rotating speed so as to keep the flow of the variable-frequency water pump (110) equal to the lower limit value of the flow interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570434.1A CN114198832B (en) | 2021-12-21 | 2021-12-21 | Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570434.1A CN114198832B (en) | 2021-12-21 | 2021-12-21 | Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114198832A true CN114198832A (en) | 2022-03-18 |
| CN114198832B CN114198832B (en) | 2023-04-18 |
Family
ID=80655702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111570434.1A Active CN114198832B (en) | 2021-12-21 | 2021-12-21 | Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114198832B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010112699A (en) * | 2008-10-09 | 2010-05-20 | Sanki Eng Co Ltd | Heating medium piping system |
| CN103411293A (en) * | 2013-09-05 | 2013-11-27 | 刘新民 | Method and device for control on air conditioner cold water system based on tail end cold quantity active adjustment |
| WO2018225221A1 (en) * | 2017-06-08 | 2018-12-13 | 三菱電機株式会社 | Heat source system |
| CN209484770U (en) * | 2018-12-18 | 2019-10-11 | 上海丰律流体技术有限公司 | A kind of energy-efficient air-conditioner water system |
| CN209782928U (en) * | 2019-04-22 | 2019-12-13 | 上海丰律流体技术有限公司 | Energy-saving variable-frequency water pump control system |
| JP2020106235A (en) * | 2018-12-27 | 2020-07-09 | 高砂熱学工業株式会社 | Cooling system and cooling method |
| CN211551977U (en) * | 2019-12-26 | 2020-09-22 | 中科建创工程有限公司 | Intelligent control variable frequency regulating system for air conditioner circulating water pump |
-
2021
- 2021-12-21 CN CN202111570434.1A patent/CN114198832B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010112699A (en) * | 2008-10-09 | 2010-05-20 | Sanki Eng Co Ltd | Heating medium piping system |
| CN103411293A (en) * | 2013-09-05 | 2013-11-27 | 刘新民 | Method and device for control on air conditioner cold water system based on tail end cold quantity active adjustment |
| WO2018225221A1 (en) * | 2017-06-08 | 2018-12-13 | 三菱電機株式会社 | Heat source system |
| CN209484770U (en) * | 2018-12-18 | 2019-10-11 | 上海丰律流体技术有限公司 | A kind of energy-efficient air-conditioner water system |
| JP2020106235A (en) * | 2018-12-27 | 2020-07-09 | 高砂熱学工業株式会社 | Cooling system and cooling method |
| CN209782928U (en) * | 2019-04-22 | 2019-12-13 | 上海丰律流体技术有限公司 | Energy-saving variable-frequency water pump control system |
| CN211551977U (en) * | 2019-12-26 | 2020-09-22 | 中科建创工程有限公司 | Intelligent control variable frequency regulating system for air conditioner circulating water pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114198832B (en) | 2023-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107514743B (en) | Air conditioner control method and device and air conditioner | |
| EP3564596B1 (en) | Control method for a heating operation of an air-conditioner | |
| CN111795466B (en) | Air conditioner heating and air-releasing control method and device, air conditioner and computer readable storage medium | |
| CN103486689B (en) | The control method of air-conditioner and device | |
| CN104654538A (en) | Method and device for controlling air output | |
| CN104515254A (en) | Air conditioning compressor frequency control method | |
| CN104566768B (en) | Control method of air conditioner and air conditioner | |
| CN111207481A (en) | Water multi-connected system compressor frequency-up-down control method, storage medium and air conditioner | |
| CN105091204A (en) | Control method of multi-split system | |
| CN108917117B (en) | Air conditioner and control method and device thereof | |
| CN106352486B (en) | A kind of energy-saving control method and control system of air-conditioning | |
| CN109751911B (en) | Self-adaptive adjusting method for fan frequency of cooling tower and air conditioning system | |
| CN111140984A (en) | Water multi-connected central air conditioner control method, computer readable storage medium and air conditioner | |
| US11543148B2 (en) | Air conditioning system and control method therof | |
| CN104566769A (en) | Air conditioner energy saving control method and system | |
| CN108278723A (en) | The control method of air-conditioning | |
| CN106801972B (en) | A kind of transducer air conditioning protection control method and transducer air conditioning | |
| CN211551977U (en) | Intelligent control variable frequency regulating system for air conditioner circulating water pump | |
| CN114459133A (en) | Energy-saving control method and energy-saving control system for central air-conditioning system | |
| CN114294789B (en) | Control method of air conditioning system, air conditioning system and air conditioner | |
| CN113007829B (en) | Air conditioner control method and device and air conditioner | |
| CN112665132B (en) | Air conditioning system, energy-saving control method and device for cooling side of air conditioning system and controller | |
| CN114198832B (en) | Air conditioning system, constant-current energy-saving control method and variable-current energy-saving control method | |
| CN112556485A (en) | Operation control system and operation control method for cooling tower of ice machine | |
| CN111396298A (en) | Circulating water pump active and passive frequency conversion combined control method based on pressure difference set value change |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221014 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |