CN106871364B - Method for controlling outlet water temperature of cooling tower of central air-conditioning system - Google Patents
Method for controlling outlet water temperature of cooling tower of central air-conditioning system Download PDFInfo
- Publication number
- CN106871364B CN106871364B CN201710136349.1A CN201710136349A CN106871364B CN 106871364 B CN106871364 B CN 106871364B CN 201710136349 A CN201710136349 A CN 201710136349A CN 106871364 B CN106871364 B CN 106871364B
- Authority
- CN
- China
- Prior art keywords
- cooling
- cooling tower
- temperature
- set value
- water
- 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.)
- Active
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 340
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004378 air conditioning Methods 0.000 title claims abstract description 39
- 238000013459 approach Methods 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000000498 cooling water Substances 0.000 claims description 54
- 230000001186 cumulative effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 101150089473 CWP1 gene Proteins 0.000 description 1
- 101100008072 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CWP2 gene Proteins 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- 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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a control method of the outlet water temperature of a cooling tower of a central air-conditioning system, wherein the central air-conditioning system comprises a control device, a cooling tower group, a cooling pump group and a water chilling unit, the inlet side of the cooling pump group is connected with the water tank side of the cooling tower group, the outlet side of the cooling pump group is connected with the cooling side water inlet of the water chilling unit, the cooling side water outlet of the water chilling unit is connected with the spraying side of the cooling tower group, and the control device is connected with the cooling tower group and the cooling pump group; wherein the control method comprises the steps of: the control device controls the number of the cooling towers in operation and/or controls the number and/or frequency of the cooling tower fans in operation to achieve that the outlet water temperature of the cooling tower reaches or approaches the outdoor wet bulb temperature. The control method of the invention enables the outlet water temperature of the cooling tower to reach or approach the outdoor wet bulb temperature, and the central air-conditioning system has the characteristic of self-searching wet bulb temperature.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for controlling the outlet water temperature of a cooling tower of a central air-conditioning system.
Background
In a central air conditioning system, the cooling side return water temperature of a chiller (i.e., the outlet water temperature of a cooling tower) has a great influence on the energy consumption of the chiller, for example, the COP of the chiller may be reduced by 3% for every 1 ℃ increase in the cooling side return water temperature. The performance of the cooling tower is abandoned, and the outlet water temperature of the cooling tower is influenced by the outdoor wet bulb temperature, namely the higher the outdoor wet bulb temperature is, the higher the outlet water lower limit temperature of the cooling tower is.
However, the outdoor wet bulb temperature varies with time and climate. Although the outdoor wet bulb temperature can be measured through the wet bulb temperature sensor or the temperature and humidity sensor, the outdoor wet bulb temperature is limited by the installation position of the sensor, and the wet bulb temperature around the cooling tower cannot be measured accurately, so that the measurement error is large. In addition, the measurement accuracy of the wet bulb temperature sensor or the temperature/humidity sensor may also be shifted with the passage of time. Therefore, the control of the outlet water temperature of the cooling tower according to the wet bulb temperature measured by the outdoor wet bulb temperature sensor or the temperature and humidity sensor is often inaccurate.
Disclosure of Invention
Based on the above situation, the main objective of the present invention is to provide a method for controlling the outlet water temperature of a cooling tower of a central air conditioning system, which can keep the outlet water temperature near the lower limit temperature on the premise of saving energy without measuring the outdoor wet bulb temperature.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method for the outlet water temperature of a cooling tower of a central air-conditioning system comprises a control device, a cooling tower group, a cooling pump group and a water chilling unit, wherein the inlet side of the cooling pump group is connected with the water tank side of the cooling tower group, the outlet side of the cooling pump group is connected with the cooling side water inlet of the water chilling unit, the cooling side water outlet of the water chilling unit is connected with the spraying side of the cooling tower group, the control device is connected with the cooling tower group and the cooling pump group, the cooling tower group comprises cooling towers, and a cooling tower fan is arranged in each cooling tower; wherein the control method comprises the steps of: the control device controls the number of the cooling towers in operation and/or controls the number and/or frequency of the cooling tower fans in operation to achieve that the outlet water temperature of the cooling tower reaches or approaches the outdoor wet bulb temperature.
Preferably, the step of the control device controlling the number of cooling towers put into operation at the time of starting the central air conditioning system includes:
and determining the number of the cooling towers which are put into operation according to the number of the cooling water pumps which are actually operated in the cooling pump group.
Preferably, the principle of determining the number of cooling towers put into operation is: the number of the cooling towers which are put into operation is the minimum integer which is more than or equal to the number of the cooling water pumps which are operated multiplied by 1.5.
Preferably, the step of the control device controlling the number of cooling towers put into operation during the operation of the central air conditioning system includes:
and enabling the number of the cooling towers in operation to be between the maximum value and the minimum value, wherein the maximum value of the number of the cooling towers in operation is a minimum integer which is more than or equal to the number of the cooling water pumps in operation multiplied by 1.5, and the minimum value of the number of the cooling towers in operation is equal to the number of the cooling water pumps in operation.
Preferably, the step of the control device controlling the number of cooling towers put into operation during the operation of the central air conditioning system further includes:
judging whether the operation of one cooling tower needs to be reduced or not, and if so, closing the cooling tower with the longest accumulated operation time;
and/or judging whether the operation of one cooling tower needs to be increased or not, and if so, starting the cooling tower with the shortest accumulated operation time.
Preferably, the control means determines that it is necessary to reduce the operation of one cooling tower when any one of the following conditions C01-C04 is satisfied:
c01, the number of the cooling towers in operation is more than the number of the cooling water pumps;
c02, when the accumulated time is larger than or equal to a first preset time interval after the tower adding or tower reducing process is finished, if the accumulated time is continuously satisfied within a first preset time period t 1: the temperature drop rate of the water outlet main pipe of the cooling tower is less than or equal to a first preset temperature drop rate;
c03, the temperature of the cooling tower water outlet main pipe is less than or equal to a first temperature set value;
c04, the input operation number of the cooling towers is larger than the maximum value of the input operation number of the cooling towers;
and/or, the control device determines that an additional cooling tower operation is required when any one of the following conditions C11-C13 is satisfied:
c11, when the accumulated time is larger than or equal to the first preset time interval after the tower adding or tower reducing process is finished, if the accumulated time is continuously satisfied within the second preset time period t 2: the temperature rise rate of the water outlet main pipe of the cooling tower is more than or equal to a first preset temperature rise rate;
c12, the temperature of the cooling tower water outlet main pipe is more than or equal to a second temperature set value;
c13, the number of the cooling towers in operation is less than the number of the cooling water pumps in operation.
Preferably, the first preset time interval is 5-20 minutes;
and/or the first preset time t1 is 60-180 seconds;
and/or the first preset temperature drop rate is 0.1-0.2 ℃/min;
and/or the first temperature set point is 18-20 ℃;
and/or the second preset time t2 is 60-180 seconds;
and/or the first preset temperature rise rate is 0.1-0.2 ℃/min;
and/or the second temperature set value is 28-32 ℃.
Preferably, the method further comprises the steps of:
during the operation of the central air conditioning system, if the following conditions are continuously satisfied within the third preset time period t 3: if the temperature of the water outlet main pipe of the cooling tower is more than or equal to the third temperature set value, starting all fans of the cooling tower which is put into operation;
and/or, during the operation of the central air conditioning system, when all the cooling water pumps are turned off, or if the following conditions are continuously satisfied within the sixth preset time period t 6: and if the temperature of the water outlet main pipe of the cooling tower is less than the sixth temperature set value, closing all fans of the cooling tower.
Preferably, the third preset time period t3 is 30-90 seconds;
and/or the third temperature set value is 20-24 ℃;
and/or the sixth preset time t6 is 5-30 seconds;
and/or the sixth temperature set value is 14-20 ℃.
Preferably, the step of controlling the number and/or frequency of the cooling tower fans by the control device comprises:
if the cooling tower fans are fixed-frequency fans, adjusting the number of running fans of the cooling tower which is put into operation;
and if the cooling tower fans are variable frequency fans, synchronously adjusting the frequency of the fans of all cooling towers which are put into operation.
Preferably, for the fixed frequency fan, the step of adjusting the number of the cooling tower fans operated by the control device comprises:
judging whether the operation of one cooling tower fan needs to be increased or not, and if so, starting the cooling tower fan with the shortest accumulated operation time;
and/or judging whether the operation of one cooling tower fan needs to be reduced or not, and if so, closing the cooling tower fan with the longest accumulated operation time.
Preferably, the control device determines that it is necessary to increase the operation of one cooling tower fan when the following condition C21 is satisfied:
c21, continuously satisfying for a fourth preset time period t 4: the temperature of the water outlet main pipe of the cooling tower is more than or equal to a fourth temperature set value;
and/or, when the following condition C22 is satisfied, the control device determines that it is necessary to reduce the operation of one cooling tower fan:
c22, continuously satisfying for a fifth preset time period t 5: the sixth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than or equal to the fifth temperature set value.
Preferably, the fourth preset time period t4 is 30-90 seconds;
and/or the fourth temperature set value is 24-28 ℃;
and/or the fifth preset time t5 is 30-90 seconds;
and/or the fifth temperature set value is 20-24 ℃;
and/or the sixth temperature set value is 14-20 ℃.
Preferably, for the variable frequency fans, the step of synchronously adjusting the frequencies of all the fans by the control device comprises:
if it is continuously satisfied within the seventh preset time period t 7: if the temperature of the water outlet main pipe of the cooling tower is more than or equal to the seventh temperature set value, increasing the frequency of all fans by F1;
if it is continuously satisfied within the seventh preset time period t 7: if the eighth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the seventh temperature set value, increasing the frequency of all the fans by F2, wherein F2 is less than F1;
and/or the presence of a gas in the gas,
if it is continuously satisfied within the eighth preset time period t 8: if the ninth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the tenth temperature set value, reducing the frequency of all the fans by F3;
if it is continuously satisfied within the eighth preset time period t 8: and if the eleventh temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the ninth temperature set value, reducing the frequency of all the fans by F4, wherein F3 is less than F4.
Preferably, the seventh preset time period t7 is 5-30 seconds;
and/or the seventh temperature set value is 28-30 ℃;
and/or the eighth temperature set value is 26-28 ℃.
And/or F1 is 2-8 Hz;
and/or F2 is 0.5-2 Hz;
and/or the eighth preset time t8 is 5-30 seconds;
and/or the ninth temperature set value is 14-19 ℃;
and/or the tenth temperature set value is 20-24 ℃.
And/or the eleventh temperature set value is 14-19 ℃;
and/or F3 is 0.5-2 Hz;
and/or F4 is 2-8 Hz.
The control method of the invention can achieve the optimal air-water ratio by controlling the number of the cooling towers and/or the number and/or the frequency of the cooling tower fans and monitoring the temperature of the cooling tower water outlet main pipe for feedback control, so that the water outlet temperature of the cooling tower can reach or approach the outdoor wet bulb temperature, the system has the characteristic of self-searching the wet bulb temperature, and the outdoor wet bulb temperature does not need to be measured.
Particularly, the control method controls the number of cooling towers in operation and the number and/or frequency of fans of the cooling towers through the temperature drop rate of the water outlet main pipe of the cooling tower and the control method of the air-water ratio of the cooling system of the air-conditioning water system, so that the characteristic of self-searching wet bulb temperature of the system is realized.
Drawings
The preferred embodiments of the method for controlling the temperature of the outlet water of the cooling tower of the central air-conditioning system according to the present invention will be described below with reference to the accompanying drawings. In the figure:
FIG. 1 is a schematic diagram of the cooling side of a chiller of a central air conditioning system according to the present invention;
FIG. 2 is a schematic diagram of the basic control flow of the method for controlling the outlet water temperature of the cooling tower of the central air conditioning system according to the present invention;
fig. 3 is a control flow diagram of a preferred embodiment of the method for controlling the outlet water temperature of the cooling tower of the central air-conditioning system according to the invention.
Detailed Description
Referring initially to fig. 1, the major components of the chiller cooling side of a central air conditioning system in accordance with the present invention are shown. As shown in fig. 1, the central air conditioning system according to the present invention includes a control device 100, a cooling tower set 200, a cooling pump set 300, and a water chiller 400. Wherein, the inlet side of the cooling pump unit 300 is connected to the water tank side (i.e. water outlet side) of the cooling tower set 200, the outlet side of the cooling pump unit 300 is connected to the cooling side water inlet of the water chilling unit 400, the cooling side water outlet of the water chilling unit 400 is connected to the spraying side (i.e. water inlet side) of the cooling tower set 200, and the control device 100 is connected to the cooling tower set 200 and the cooling pump unit 300.
Specifically, the cooling tower group 200 includes a plurality of cooling towers, such as CT1, CT2, CT3, and CT … … shown in fig. 1, which are n in total, and each cooling tower has a cooling tower fan therein, which may be a variable frequency fan or a fixed frequency fan. Generally, the fans of the cooling towers in the cooling tower group 200 are of the same type, and are either all variable frequency fans or all constant frequency fans. As shown in fig. 1, each cooling tower fan is connected to the control device 100, so that the on-off state and/or the operating frequency of the cooling tower fan can be controlled by the control device 100.
As shown in fig. 1, the spraying side (i.e. water inlet side) of each cooling tower is respectively provided with valves which can be controlled by the control device 100 to be opened and closed, such as V1, V2, V3, … … and Vn shown in fig. 1, and the water tank side (i.e. water outlet side) of each cooling tower is also respectively provided with valves which can be controlled by the control device 100 to be opened and closed, such as V1 ', V2', V3 ', … … and Vn' shown in fig. 1. Preferably, the valves are electrically operated butterfly valves. The control device 100 can control the opening and closing of the channel of the corresponding cooling tower by controlling the opening and closing state of the valves at the two sides of the inlet and outlet water of each cooling tower, thereby controlling whether the cooling tower is put into operation.
In the invention, as for one cooling tower, as long as the valves on the two sides of the water inlet and the water outlet of the cooling tower are opened, the channel of the cooling tower is opened, namely the cooling tower is considered to be put into operation. Under the condition that the cooling tower is put into operation, the fan in the cooling tower can be in an open operation state or a closed state. It is easy to understand that for a cooling tower to be put into operation, when the fan inside the cooling tower is turned on, the temperature of the cold water in the water tank is obviously lower than that when the fan is turned off.
As shown in fig. 1, the cooling pump group 300 includes a plurality of cooling water pumps, and when the number of cooling towers is n, the number of cooling water pumps may be n or n +1, for example, n +1 cooling water pumps are shown in the figure, which are CWP1, CWP2, CWP3, … … CWPn, and CWP (n +1), respectively, and these cooling water pumps are connected to the controller 100 and can be turned on or off under the control of the controller 100.
As shown in fig. 1, the chiller 400 includes a plurality of chillers, such as the n illustrated chillers.
In addition, as shown in fig. 1, a first temperature sensor 501 is arranged on the cooling water supply main between the cold water pump set 300 and the cold water set 400, so as to measure the cooling side return water temperature of the cold water set 400 (i.e. the temperature of the cooling tower outlet main, which represents the outlet water temperature of the cooling tower); a second temperature sensor 502 may be further disposed on the cooling water return manifold between the chiller 400 and the cooling tower 200, so as to measure the cooling side water supply temperature of the chiller 400 (i.e. the inlet water temperature of the cooling tower). It should be noted that the control method of the present invention does not require measurement of the cooling side feed water temperature.
Considering the inaccuracy of outdoor wet bulb temperature measurement, the invention provides a control method of the outlet water temperature of a cooling tower of a central air-conditioning system, which avoids the measurement of the outdoor wet bulb temperature, and controls the number of running cooling towers (specifically, controls valves at the water inlet and outlet sides of the cooling tower), the number and/or frequency of fans of the cooling tower, the number of cooling water pumps and the like, and monitors the temperature of a water outlet main pipe of the cooling tower to perform feedback control, so that the optimal air-water ratio can be achieved, the outlet water temperature of the cooling tower can reach or approach the outdoor wet bulb temperature, and the central air-conditioning system has the characteristic of self-seeking wet bulb temperature (or self-seeking optimization).
Specifically, as shown in fig. 2, the method for controlling the outlet water temperature of the cooling tower of the central air-conditioning system of the present invention comprises the following steps: the control device 100 controls the number of the cooling towers in operation and/or controls the number and/or frequency of the cooling tower fans in operation to achieve that the outlet water temperature of the cooling tower reaches or approaches the outdoor wet bulb temperature.
The water inlet temperature of the cooling tower is determined by the operation condition of the air conditioning unit, and the water outlet temperature of the cooling tower is determined by the performance (such as air volume, filling materials and the like) of the cooling tower, the outdoor temperature and humidity, the water inlet temperature, the flow and other conditions. The invention can make the cooling tower reduce the water outlet temperature of the cooling tower as much as possible in a most energy-saving and simple way along with the load change of the air conditioning unit and the change of the outdoor environment temperature and humidity on the premise of keeping the water flow constant by adjusting the number of the cooling tower in operation and controlling the number and/or frequency of the fans, namely by controlling the air-water ratio of the cooling system.
Preferably, the number of cooling water pump operations is kept the same as the number of chiller operations. For example: 3 cooling water pumps correspond to 3 water chilling units, and 2 cooling water pumps correspond to 2 water chilling units. Because the cooling water path of the system is generally an open system, the water flow rate basically corresponds to the flow rate of the water chilling unit, and if the running number of the cooling water pumps is more than that of the water chilling unit, the cooling tower has the possibility of spraying water outwards; if the number of the running cooling water pumps is less than that of the running water chilling units, the water chilling units may all report water flow switch protection. The number of cooling water pumps operated is therefore preferably identical to the number of chiller units.
A preferred specific control flow of the control method of the present invention is shown in fig. 3.
Preferably, when the central air conditioning system is started, the cooling tower channel needs to be opened first, that is, the cooling tower needs to be put into operation, and for this purpose, the step of controlling the number of cooling tower put into operation by the control device 100 includes:
determining the number of cooling towers which are put into operation according to the number of cooling water pumps which actually operate in the cooling pump group, wherein the determination principle is as follows: the number of the cooling towers which are put into operation is the minimum integer which is more than or equal to the number of the cooling water pumps which are operated multiplied by 1.5.
That is, when the system is started, the channels of the cooling tower are opened (i.e., the valves on both sides of the inlet and outlet water of the cooling tower are opened) according to the number determined by the following formula according to the principle of minimum operation time:
the number of the cooling towers which are put into operation is equal to the number of the cooling water pumps which are operated multiplied by 1.5, and the number of the cooling towers which are put into operation can only be an integer but not a decimal number, so the rounding is required to be performed upwards, namely, the decimal number is only required to be performed after the decimal point, the rounding is performed upwards, namely, the integer obtained by adding 1 to the integer number is obtained.
For example, 1 cooling water pump corresponds 2 cooling towers, 2 cooling water pumps correspond 3 cooling towers, 3 cooling water pumps correspond 5 cooling towers, and so on. However, it should be noted that since the maximum number of cooling towers in the system is n, n cooling water pumps may also correspond to n cooling towers eventually.
Through the control mode, when the central air-conditioning system is started, the cooling circulating water can be cooled at the highest speed, and the water temperature is stabilized at a more ideal value.
Preferably, the step of the control device 100 controlling the number of cooling towers put into operation during the operation of the central air conditioning system includes:
and enabling the number of the cooling towers in operation to be between the maximum value and the minimum value, wherein the maximum value of the number of the cooling towers in operation is a minimum integer which is more than or equal to the number of the cooling water pumps in operation multiplied by 1.5, and the minimum value of the number of the cooling towers in operation is equal to the number of the cooling water pumps in operation.
That is, the maximum value of the number of cooling tower input operations is equal to the number of cooling water pump operations × 1.5, and the number is rounded up (that is, after the decimal point, the decimal point is rounded up, that is, the decimal point is rounded up by 1). For example, 1 cooling water pump corresponds to 2 cooling towers at most, 2 cooling water pumps correspond to 3 cooling towers at most, 3 cooling water pumps correspond to 5 cooling towers at most, and so on. However, it should be noted that since the maximum number of cooling towers in the system is n, the n cooling water pumps can only correspond to the n cooling tower channels at most.
And according to the number of the cooling towers which are put into operation and determined according to the maximum value and the minimum value, the air-water ratio of the obtained cooling tower can ensure that the cooling tower has strong heat dissipation capacity, and the system is operated more efficiently.
Preferably, the step of the control device 100 controlling the number of cooling towers put into operation during the operation of the central air conditioning system further includes:
judging whether the operation of one cooling tower needs to be reduced or not, and if so, closing the cooling tower with the longest accumulated operation time;
and/or judging whether the operation of one cooling tower needs to be increased or not, and if so, starting the cooling tower with the shortest accumulated operation time.
That is, during the operation of the central air conditioning system, the control device 100 can determine whether to close (i.e., decrease) or open (i.e., increase) one cooling tower channel at any time, and if so, close or open one cooling tower accordingly. Specifically, when one cooling tower needs to be shut down, the cooling tower with the longest accumulated running time is shut down, and the fan of the cooling tower is preferably also shut down at the same time; when a cooling tower needs to be started, the cooling tower with the shortest accumulated running time is started, and the fan of the cooling tower is preferably also started at the same time.
The cumulative operation time of the cooling tower refers to a cumulative value of the fan operation time of the cooling tower, and when the fan is operated, the operation time is cumulative, and when the fan is stopped, the operation time is stopped from being cumulative, but the operation time before is not cleared. The cumulative operating time of the cooling tower can be, for example, in hours with an accuracy of, for example, 0.1 hour.
Preferably, the control device 100 determines that the operation of one cooling tower needs to be reduced when any one of the following conditions C01-C04 is satisfied:
c01, the number of the cooling towers in operation is larger than the number of the cooling water pumps in operation;
c02, under the condition that the accumulated time is more than or equal to the first preset time interval after the previous cooling tower adding or subtracting process is finished, if the accumulated time continuously satisfies the following conditions within the first preset time period t 1: the temperature drop rate of the water outlet main pipe of the cooling tower is less than or equal to a first preset temperature drop rate;
c03, the temperature of the cooling tower water outlet main pipe is less than or equal to a first temperature set value;
c04, the input operation number of the cooling towers is larger than the maximum value of the input operation number of the cooling towers;
the condition C01 is set to mean that when the chiller is turned off, the cooling water pump is turned off accordingly, which results in a reduction in the number of cooling water pump operations, and when the number of cooling water pump operations is less than the number of cooling towers that are put into operation, a reduction in the operation of one cooling tower is required.
In condition C02, the first predetermined time interval may be defined as a cooling tower plus-minus tower time interval, and the setting principle is as follows: when the accumulated time is longer than the time interval after the previous cooling tower adding or subtracting process is finished, the water outlet temperature of the cooling tower is stable, and the subsequent adjustment is significant after the water outlet temperature is stable. The first preset time interval is preferably 5 to 20 minutes, and more preferably 15 minutes. Condition C02 is set to mean that when the leaving water temperature of the cooling tower is no longer decreasing, an attempt can be made to shut down a cooling tower to see if the leaving water temperature is increasing; if the water temperature does not rise after the closing, the water temperature of the cooling tower is close to the critical value of the wet bulb temperature. The first preset time t1 is preferably 60-180 seconds, and more preferably 120 seconds; the first preset temperature drop rate is preferably 0.1-0.2 ℃/minute, more preferably 0.1 ℃/minute, and the temperature drop rate of the water outlet main pipe of the cooling tower is preferably calculated every 10 seconds.
In condition C03, the first temperature set value is 18 to 20 ℃, and for example, the first temperature set value is preferably 20 ℃ when the chiller is a screw machine, and is preferably 18 ℃ when the chiller is a centrifuge. The condition C03 is set in such a way that the lowest temperature of the cooling tower outlet water must meet the cooling water temperature requirement of the unit, since the unit may report high-pressure protection if the cooling water temperature is too low, and therefore the cooling tower outlet water temperature should be prevented from being too low.
In condition C04, the maximum value of the number of cooling tower input operations is the current number of cooling water pump operations × 1.5, and rounded up. Since the number of cooling water pumps is adjusted according to the operating conditions of the system, the maximum number of cooling tower channels to be opened (i.e., the maximum number of cooling tower channels to be put into operation) should always be related to the actual number of cooling water pumps to be operated.
Preferably, the control device 100 determines that an additional operation of a cooling tower is required when any one of the following conditions C11-C13 is satisfied:
c11, under the condition that the accumulated time is more than or equal to the first preset time interval after the previous cooling tower adding or subtracting process is finished, if the accumulated time continuously satisfies the following conditions within the second preset time period t 2: the temperature rise rate of the water outlet main pipe of the cooling tower is more than or equal to a first preset temperature rise rate;
c12, the temperature of the cooling tower water outlet main pipe is more than or equal to a second temperature set value;
c13, the number of the cooling towers in operation is less than the number of the cooling water pumps in operation.
Condition C11 is set to mean that if the water temperature rises and deviates from the outdoor wet bulb temperature value, a cooling tower channel is added to reduce the temperature. Specifically, the meaning of the first preset time interval is the same as that of the first preset time interval, the second preset time period t2 is preferably 60-180 seconds, more preferably 120 seconds, the first preset temperature rise rate is preferably 0.1-0.2 ℃/minute, more preferably 0.2 ℃/minute, and the temperature rise rate of the water outlet main of the cooling tower is preferably calculated every 10 seconds.
Condition C12 is set to mean that if the water temperature is too high, the unit energy efficiency is reduced, so a cooling tower channel needs to be added to reduce the temperature. Specifically, the second temperature setting value is preferably 28-32 ℃, and more preferably 30 ℃.
The condition C13 is set to mean that the number of cooling towers put into operation is too small (less than its minimum value), which results in a reduction in the heat dissipation capacity of the cooling towers, and therefore requires the addition of a cooling tower passage to reduce the temperature.
When one cooling tower is closed or added under the condition of meeting the conditions, the water temperature can be ensured to change stably and is close to the outdoor wet bulb temperature.
Preferably, the control method of the present invention further includes controlling the number of cooling tower fans, and specifically includes the steps of:
during the operation of the central air conditioning system, if the following conditions are continuously satisfied within the third preset time period t 3: if the temperature of the water outlet main pipe of the cooling tower is more than or equal to the third temperature set value, starting all fans of the cooling tower which is put into operation;
and/or, during the operation of the central air conditioning system, when all the cooling water pumps are turned off, or if the following conditions are continuously satisfied within the sixth preset time period t 6: and if the temperature of the water outlet main pipe of the cooling tower is less than the sixth temperature set value, closing all fans of the cooling tower.
That is, when the fans of the cooling tower of the system are operated, if the temperature of the water outlet main pipe of the cooling tower is greater than or equal to the third temperature set value (preferably 20-24 ℃, more preferably 24 ℃, because 24 ℃ is a reasonable fan starting point), and when the temperature is continuously met within the third preset time period t3 (preferably 30-90 seconds, more preferably 60 seconds), the fans of the cooling tower with all the channels opened are started, no matter whether each fan of the cooling tower is a variable frequency fan or a fixed frequency fan.
And during the operation of the central air-conditioning system, when all the cooling water pumps are closed, all the cooling tower fans are immediately closed to avoid electric energy waste. Or the temperature of the cooling tower water outlet main pipe is less than a sixth temperature set value (which can be defined as a protection value of unit cooling return water temperature, preferably 14-20 ℃, and more preferably 18 ℃), and when the sixth preset time t6 (preferably 5-30 seconds, and more preferably 20 seconds) is continuously met, all fans are also closed, so that a water chilling unit is protected, and high-pressure protection of the unit due to too low water temperature is avoided.
Preferably, the step of controlling the number and/or frequency of the cooling tower fans by the control device 100 comprises:
if the cooling tower fans are fixed-frequency fans, adjusting the number of running fans of the cooling tower which is put into operation;
if the cooling tower fans are variable frequency fans, the frequency of the fans of all the cooling towers which are put into operation is synchronously adjusted, and the fans can be preferably switched on and off simultaneously, so that the control of the number of the fans is not involved.
That is, when the cooling tower fans are fixed-frequency fans, the proper air-water ratio can be realized by controlling the number of the fans in operation; and when the cooling tower fan is the frequency conversion fan, the proper air-water ratio can be realized by controlling the operating frequency of the fan without changing the number of the fans in operation.
Preferably, for the fixed frequency fan, the step of the control device 100 adjusting the number of the cooling tower fans to operate includes:
judging whether the operation of one cooling tower fan needs to be increased or not, and if so, starting the cooling tower fan with the shortest accumulated operation time;
and/or judging whether the operation of one cooling tower fan needs to be reduced or not, if so, closing the cooling tower fan with the longest accumulated operation time, and ensuring that at least one fan is left to operate.
Specifically, the control device 100 determines that it is necessary to increase the operation of one cooling tower fan when the following condition C21 is satisfied for the constant frequency fan:
c21, continuously satisfying for a fourth preset time period t4 (preferably 30-90 seconds, more preferably 60 seconds): the temperature of the water outlet main pipe of the cooling tower is more than or equal to a fourth temperature set value (preferably 24-28 ℃, and more preferably 26 ℃).
When the following condition C22 is satisfied, the control device 100 determines that it is necessary to reduce the operation of one cooling tower fan:
c22, continuously satisfying for a fifth preset time period t5 (preferably 30-90 seconds, more preferably 60 seconds): the sixth temperature setting value is less than or equal to the temperature of the water outlet main pipe of the cooling tower, and is less than or equal to the fifth temperature setting value (preferably 20-24 ℃, and more preferably 22 ℃). The sixth set temperature is consistent with the sixth set temperature, is a protection value of the cooling return water temperature of the unit, and is preferably 14-20 ℃, and more preferably 18 ℃.
In other cases, the number of cooling tower fans operating remains the same.
Through the fan loading and unloading control, the temperature of the water outlet of the cooling tower can be controlled to be 22-26 ℃ as much as possible.
Preferably, for the variable frequency fans, the step of synchronously adjusting the frequencies of all the fans by the control device 100 includes:
if the following conditions are continuously satisfied within a seventh preset time period t7 (preferably 5-30 seconds, more preferably 10 seconds): if the temperature of the water outlet main pipe of the cooling tower is more than or equal to a seventh temperature set value (preferably 28-30 ℃, more preferably 28 ℃), raising the frequency of all fans by F1;
if the following conditions are continuously satisfied within a seventh preset time period t7 (preferably 5-30 seconds, more preferably 10 seconds): when the temperature of a water outlet main pipe of the cooling tower is less than a seventh temperature set value (preferably 28-30 ℃ and more preferably 28 ℃) and more preferably less than an eighth temperature set value (preferably 26-28 ℃ and more preferably 26 ℃), increasing the frequency of all fans by F2, wherein F2 is less than F1; for example, F1 ═ 2 to 8Hz, F2 ═ 0.5 to 2Hz, preferably F1 ═ 5 Hz; f2-2 Hz.
By the frequency-raising control, the temperature of the water outlet of the cooling tower can be controlled to be 20-28 ℃ as much as possible.
If the following conditions are continuously satisfied within an eighth preset time period t8 (preferably 5-30 seconds, more preferably 20 seconds): the temperature of a cooling tower water outlet main pipe is less than a tenth temperature set value (preferably 20-24 ℃ and more preferably 22 ℃) and less than a ninth temperature set value (preferably 14-19 ℃ and more preferably 19 ℃), and then the frequency of all fans is reduced by F3;
if the following conditions are continuously satisfied within an eighth preset time period t8 (preferably 5-30 seconds, more preferably 20 seconds): the temperature of a cooling tower water outlet main pipe is less than a ninth temperature set value (preferably 14-19 ℃ and more preferably 18 ℃), the frequency of all fans is reduced by F4, wherein F3 is less than F4; for example, F3 ═ 0.5 to 2Hz, F4 ═ 2 to 8Hz, preferably F3 ═ 2 Hz; f4-5 Hz.
By the frequency reduction control, the temperature of the outlet water of the cooling tower can be controlled to be 20-28 ℃ as much as possible.
Otherwise, the frequency of the fan is not adjusted.
In summary, compared with the method for installing the outdoor temperature and humidity sensor in the prior art, the control method provided by the invention can control the outlet water temperature of the cooling tower more reliably, and the outdoor temperature and humidity sensor is not required to be installed.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (11)
1. A control method for the outlet water temperature of a cooling tower of a central air-conditioning system comprises a control device, a cooling tower group, a cooling pump group and a water chilling unit, wherein the inlet side of the cooling pump group is connected with the water tank side of the cooling tower group, the outlet side of the cooling pump group is connected with the cooling side water inlet of the water chilling unit, the cooling side water outlet of the water chilling unit is connected with the spraying side of the cooling tower group, the control device is connected with the cooling tower group and the cooling pump group, the cooling tower group comprises cooling towers, and a cooling tower fan is arranged in each cooling tower; the control method is characterized by comprising the following steps: the control device controls the number of the cooling towers in operation and/or controls the number and/or frequency of the fans of the cooling towers in operation to realize that the outlet water temperature of the cooling towers reaches or approaches the outdoor wet bulb temperature;
the step of controlling the number of cooling towers put into operation by the control device when the central air-conditioning system is started comprises the following steps:
determining the number of cooling towers which are put into operation according to the number of cooling water pumps which are actually operated in the cooling pump group; the determination principle is as follows: the number of the cooling towers which are put into operation is the minimum integer which is more than or equal to the number of the cooling water pumps which are operated multiplied by 1.5;
the step of the control device controlling the number of cooling towers put into operation during the operation of the central air conditioning system further includes:
enabling the number of the cooling towers in operation to be between the maximum value and the minimum value, wherein the maximum value of the number of the cooling towers in operation is a minimum integer which is more than or equal to the number of the cooling water pumps in operation multiplied by 1.5, and the minimum value of the number of the cooling towers in operation is equal to the number of the cooling water pumps in operation;
judging whether the operation of one cooling tower needs to be reduced or not, and if so, closing the cooling tower with the longest accumulated operation time;
and/or judging whether the operation of one cooling tower needs to be increased or not, and if so, starting the cooling tower with the shortest accumulated operation time.
2. The control method according to claim 1,
the control means determines that it is necessary to reduce the operation of one cooling tower when any one of the following conditions C01-C04 is satisfied:
c01, the number of the cooling towers in operation is more than the number of the cooling water pumps;
c02, when the accumulated time is larger than or equal to a first preset time interval after the tower adding or tower reducing process is finished, if the accumulated time is continuously satisfied within a first preset time period t 1: the temperature drop rate of the water outlet main pipe of the cooling tower is less than or equal to a first preset temperature drop rate;
c03, the temperature of the cooling tower water outlet main pipe is less than or equal to a first temperature set value;
c04, the input operation number of the cooling towers is larger than the maximum value of the input operation number of the cooling towers;
and/or the presence of a gas in the gas,
the control means determines that it is necessary to increase the operation of one cooling tower when any one of the following conditions C11-C13 is satisfied:
c11, when the accumulated time is larger than or equal to the first preset time interval after the tower adding or tower reducing process is finished, if the accumulated time is continuously satisfied within the second preset time period t 2: the temperature rise rate of the water outlet main pipe of the cooling tower is more than or equal to a first preset temperature rise rate;
c12, the temperature of the cooling tower water outlet main pipe is more than or equal to a second temperature set value;
c13, the number of the cooling towers in operation is less than the number of the cooling water pumps in operation.
3. The control method according to claim 2,
the first preset time interval is 5-20 minutes;
and/or the first preset time t1 is 60-180 seconds;
and/or the first preset temperature drop rate is 0.1-0.2 ℃/min;
and/or the first temperature set point is 18-20 ℃;
and/or the second preset time t2 is 60-180 seconds;
and/or the first preset temperature rise rate is 0.1-0.2 ℃/min;
and/or the second temperature set value is 28-32 ℃.
4. The control method according to claim 1, characterized by further comprising the step of:
during the operation of the central air conditioning system, if the following conditions are continuously satisfied within the third preset time period t 3: if the temperature of the water outlet main pipe of the cooling tower is more than or equal to the third temperature set value, starting all fans of the cooling tower which is put into operation;
and/or, during the operation of the central air conditioning system, when all the cooling water pumps are turned off, or if the following conditions are continuously satisfied within the sixth preset time period t 6: and if the temperature of the water outlet main pipe of the cooling tower is less than the sixth temperature set value, closing all fans of the cooling tower.
5. The control method according to claim 4,
the third preset time t3 is 30-90 seconds;
and/or the third temperature set value is 20-24 ℃;
and/or the sixth preset time t6 is 5-30 seconds;
and/or the sixth temperature set value is 14-20 ℃.
6. The control method according to any one of claims 1 to 5, wherein the step of the control device controlling the number and/or frequency of cooling tower fans comprises:
if the cooling tower fans are fixed-frequency fans, adjusting the number of running fans of the cooling tower which is put into operation;
and if the cooling tower fans are variable frequency fans, synchronously adjusting the frequency of the fans of all cooling towers which are put into operation.
7. The control method of claim 6, wherein the step of the control device adjusting the number of cooling tower fans operating for a fixed frequency fan comprises:
judging whether the operation of one cooling tower fan needs to be increased or not, and if so, starting the cooling tower fan with the shortest accumulated operation time;
and/or judging whether the operation of one cooling tower fan needs to be reduced or not, and if so, closing the cooling tower fan with the longest accumulated operation time.
8. The control method according to claim 7,
when the following condition C21 is satisfied, the control device determines that it is necessary to add one cooling tower fan to operate:
c21, continuously satisfying for a fourth preset time period t 4: the temperature of the water outlet main pipe of the cooling tower is more than or equal to a fourth temperature set value;
and/or, when the following condition C22 is satisfied, the control device determines that it is necessary to reduce the operation of one cooling tower fan:
c22, continuously satisfying for a fifth preset time period t 5: the sixth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than or equal to the fifth temperature set value.
9. The control method according to claim 8,
the fourth preset time t4 is 30-90 seconds;
and/or the fourth temperature set value is 24-28 ℃;
and/or the fifth preset time t5 is 30-90 seconds;
and/or the fifth temperature set value is 20-24 ℃;
and/or the sixth temperature set value is 14-20 ℃.
10. The control method of claim 6, wherein the step of the control device synchronously adjusting the frequency of all the fans for variable frequency fans comprises:
if it is continuously satisfied within the seventh preset time period t 7: if the temperature of the water outlet main pipe of the cooling tower is more than or equal to the seventh temperature set value, increasing the frequency of all fans by F1;
if it is continuously satisfied within the seventh preset time period t 7: if the eighth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the seventh temperature set value, increasing the frequency of all the fans by F2, wherein F2 is less than F1;
and/or the presence of a gas in the gas,
if it is continuously satisfied within the eighth preset time period t 8: if the ninth temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the tenth temperature set value, reducing the frequency of all the fans by F3;
if it is continuously satisfied within the eighth preset time period t 8: and if the eleventh temperature set value is less than or equal to the temperature of the water outlet main pipe of the cooling tower and less than the ninth temperature set value, reducing the frequency of all the fans by F4, wherein F3 is less than F4.
11. The control method according to claim 10,
the seventh preset time t7 is 5-30 seconds;
and/or the seventh temperature set value is 28-30 ℃;
and/or the eighth temperature set value is 26-28 ℃;
and/or F1 is 2-8 Hz;
and/or F2 is 0.5-2 Hz;
and/or the eighth preset time t8 is 5-30 seconds;
and/or the ninth temperature set value is 14-19 ℃;
and/or the tenth temperature set value is 20-24 ℃;
and/or the eleventh temperature set value is 14-19 ℃;
and/or F3 is 0.5-2 Hz;
and/or F4 is 2-8 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710136349.1A CN106871364B (en) | 2017-03-09 | 2017-03-09 | Method for controlling outlet water temperature of cooling tower of central air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710136349.1A CN106871364B (en) | 2017-03-09 | 2017-03-09 | Method for controlling outlet water temperature of cooling tower of central air-conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106871364A CN106871364A (en) | 2017-06-20 |
| CN106871364B true CN106871364B (en) | 2020-12-04 |
Family
ID=59170219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710136349.1A Active CN106871364B (en) | 2017-03-09 | 2017-03-09 | Method for controlling outlet water temperature of cooling tower of central air-conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106871364B (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107388882A (en) * | 2017-08-02 | 2017-11-24 | 南京理工大学 | The multi fan of cooling tower sprays collaboration fuzzy control method more |
| CN107525430B (en) * | 2017-09-19 | 2024-05-03 | 上海大众祥源动力供应有限公司 | Cooling tower variable frequency fan control system and method |
| CN107831720A (en) * | 2017-10-20 | 2018-03-23 | 爱普（福建）科技有限公司 | Optimize the control method and computer equipment of equipment operating mode |
| CN108224624B (en) * | 2017-12-18 | 2020-08-18 | 青岛海尔空调电子有限公司 | Control method and device for water chiller system |
| CN108775673A (en) * | 2018-08-06 | 2018-11-09 | 珠海格力电器股份有限公司 | Air conditioner monitoring device, air conditioner group control system and air conditioner |
| CN109595746B (en) * | 2018-12-20 | 2020-01-03 | 珠海格力电器股份有限公司 | Water pump operation efficiency optimization control method and device and computer equipment |
| CN109751911B (en) * | 2019-01-24 | 2019-12-13 | 珠海格力电器股份有限公司 | Self-adaptive adjusting method for fan frequency of cooling tower and air conditioning system |
| CN110398034B (en) * | 2019-07-15 | 2021-05-04 | 上海美控智慧建筑有限公司 | Cooling tower control method and system of air conditioner and air conditioner |
| CN110360868B (en) * | 2019-07-17 | 2020-06-26 | 珠海格力电器股份有限公司 | Cooling tower, method and device for adjusting upper limit frequency of variable frequency fan of cooling tower and air conditioning unit |
| CN110553369B (en) * | 2019-09-04 | 2020-08-11 | 珠海格力电器股份有限公司 | Multi-fan cooling tower control method, cooling tower and air conditioner |
| CN111076345B (en) * | 2019-12-11 | 2021-03-30 | 珠海格力电器股份有限公司 | Prediction device and method of central air-conditioning system and terminal equipment |
| CN112377996B (en) * | 2020-11-18 | 2022-07-26 | 厦门烟草工业有限责任公司 | Air conditioning system and control method thereof |
| CN112556485A (en) * | 2020-12-29 | 2021-03-26 | 昆山璟赫机电工程有限公司 | Operation control system and operation control method for cooling tower of ice machine |
| CN112857132B (en) * | 2021-01-07 | 2022-11-18 | 丁一 | Cooling tower, cooling tower detection control method, device, equipment and storage medium |
| CN112857131B (en) * | 2021-01-07 | 2022-11-18 | 丁一 | Cooling tower control method and device and cooling system |
| CN113187756A (en) * | 2021-06-15 | 2021-07-30 | 河南艾牧智能设备有限公司 | Livestock and poultry house temperature gentle control method |
| CN113916024B (en) * | 2021-10-26 | 2023-03-17 | 珠海格力电器股份有限公司 | Management method, device and equipment of cooling tower, cooling tower and temperature control system |
| CN114857687B (en) * | 2022-04-15 | 2024-01-23 | 中国建筑西南设计研究院有限公司 | Control system and method for water-cooled central air conditioner cooling water system |
| CN114893870B (en) * | 2022-05-17 | 2023-10-03 | 广州大学 | Predictive control method for natural cooling system operation mode |
| CN115183408A (en) * | 2022-06-17 | 2022-10-14 | 珠海格力电器股份有限公司 | Control method and control device for variable flow operation of cooling water system |
| CN117515807B (en) * | 2023-12-25 | 2024-07-12 | 广州市百福电气设备有限公司 | Digital constant-pressure water supply energy-saving method and system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011185478A (en) * | 2010-03-05 | 2011-09-22 | Hitachi Plant Technologies Ltd | Cooling system |
| JP2013164260A (en) * | 2013-05-28 | 2013-08-22 | Toshiba Corp | Air conditioning control device, air conditioning control method, and program for air conditioning control |
| WO2016006872A1 (en) * | 2014-07-08 | 2016-01-14 | Lg Electronics Inc. | Chiller |
| CN205317074U (en) * | 2015-12-04 | 2016-06-15 | 河南中烟工业有限责任公司许昌卷烟厂 | Cooling tower water temperature control system |
| CN205536262U (en) * | 2016-02-01 | 2016-08-31 | 大连中盈机电工程有限公司 | Freezing water system of energy -conserving building |
| CN105953602A (en) * | 2016-04-25 | 2016-09-21 | 珠海格力电器股份有限公司 | Energy-saving control method and device for cooling tower and air conditioning system |
| CN106123215A (en) * | 2016-06-27 | 2016-11-16 | 新奥泛能网络科技股份有限公司 | A kind of air conditioning cooling water system control method and device |
| CN205783571U (en) * | 2016-05-26 | 2016-12-07 | 深圳市新环能科技有限公司 | A kind of central air conditioner cooling system energy-saving control apparatus |
-
2017
- 2017-03-09 CN CN201710136349.1A patent/CN106871364B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011185478A (en) * | 2010-03-05 | 2011-09-22 | Hitachi Plant Technologies Ltd | Cooling system |
| JP2013164260A (en) * | 2013-05-28 | 2013-08-22 | Toshiba Corp | Air conditioning control device, air conditioning control method, and program for air conditioning control |
| WO2016006872A1 (en) * | 2014-07-08 | 2016-01-14 | Lg Electronics Inc. | Chiller |
| CN205317074U (en) * | 2015-12-04 | 2016-06-15 | 河南中烟工业有限责任公司许昌卷烟厂 | Cooling tower water temperature control system |
| CN205536262U (en) * | 2016-02-01 | 2016-08-31 | 大连中盈机电工程有限公司 | Freezing water system of energy -conserving building |
| CN105953602A (en) * | 2016-04-25 | 2016-09-21 | 珠海格力电器股份有限公司 | Energy-saving control method and device for cooling tower and air conditioning system |
| CN205783571U (en) * | 2016-05-26 | 2016-12-07 | 深圳市新环能科技有限公司 | A kind of central air conditioner cooling system energy-saving control apparatus |
| CN106123215A (en) * | 2016-06-27 | 2016-11-16 | 新奥泛能网络科技股份有限公司 | A kind of air conditioning cooling water system control method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106871364A (en) | 2017-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106871364B (en) | Method for controlling outlet water temperature of cooling tower of central air-conditioning system | |
| CN101498494B (en) | Economical operation method for central air conditioning system | |
| CN113536525A (en) | Global optimal energy-saving control method for central air conditioner | |
| JP5513984B2 (en) | Cold water production facility and cold water production method | |
| CN102889650B (en) | Integral combination type computer room air conditioning unit and control method thereof | |
| CN104374036B (en) | The control method and air-conditioner set of air-conditioning | |
| CN201526483U (en) | Variable speed control system for condensate fan | |
| CN108534394B (en) | Group control optimization control method for loading and unloading of double units of ground source heat pump | |
| CN105365523A (en) | Electric automobile energy-saving air-conditioner based on semiconductor refrigeration and control method thereof | |
| JP2007315695A (en) | Cold and hot water control method for cold and heat source machine, and air conditioning system using it | |
| CN204786771U (en) | Air conditioner | |
| CN109751911B (en) | Self-adaptive adjusting method for fan frequency of cooling tower and air conditioning system | |
| US20140374497A1 (en) | Heat source system, control device thereof, and control method thereof | |
| US11543148B2 (en) | Air conditioning system and control method therof | |
| CN102914027A (en) | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit | |
| CN114459133B (en) | Energy-saving control method and energy-saving control system for central air conditioning system | |
| JP2017129340A (en) | Heat source control system, control method and control device | |
| CN112377996A (en) | Air conditioning system and control method thereof | |
| CN109883086B (en) | Cooling system of air conditioner, air conditioner and control method | |
| CN112556485A (en) | Operation control system and operation control method for cooling tower of ice machine | |
| CN117387250A (en) | Multi-module air source heat pump system and grouping control method thereof | |
| CN113692189A (en) | Machine room air conditioner, control method and device thereof, storage medium and processor | |
| CN111981642B (en) | Energy regulation control method for heat pump air conditioning system module unit | |
| US8863535B2 (en) | Air conditioning apparatus and control method thereof | |
| JP5677198B2 (en) | Air cooling heat pump chiller |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |