CN108709283B - System adjusting method and air conditioning system using same - Google Patents
System adjusting method and air conditioning system using same Download PDFInfo
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- CN108709283B CN108709283B CN201810533493.3A CN201810533493A CN108709283B CN 108709283 B CN108709283 B CN 108709283B CN 201810533493 A CN201810533493 A CN 201810533493A CN 108709283 B CN108709283 B CN 108709283B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 291
- 238000000034 method Methods 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 213
- 230000009467 reduction Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 20
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention provides a system adjusting method, which is used for adjusting the running state of an air conditioning system and comprises the following steps: collecting parameters of an air conditioning system; calculating the collected parameters of the air conditioning system to obtain a system efficiency value deviation delta G; and adjusting the running state of an air-conditioning host machine and the running state of a water pump in the air-conditioning system according to the system efficiency value deviation delta G, so that the adjusted system efficiency value deviation delta G of the air-conditioning system is in the minimum positive value within the system adjusting range or equal to zero. The invention also provides an air conditioning system. The system adjusting method provided by the invention can appropriately adjust the running states of the air conditioner host and the water pump which are put into parallel running, and can ensure that the combination of the air conditioner host and the water pump which are put into running after being adjusted is in a running state with optimal efficiency and lowest energy consumption, thereby achieving the purposes of energy conservation and emission reduction. The air conditioning system using the method has a combined operation mode with better energy-saving performance and wide application prospect.
Description
Technical Field
The invention relates to the technical field of system control, in particular to a system adjusting method and an air conditioning system using the same.
Background
In an air conditioning system, especially a medium-and-large air conditioning system, a plurality of air conditioning main machines and a plurality of water pumps are matched and operated in parallel. During the operation of the air conditioning system, the change of the end load can cause the demand of the chilled water of the system to change, and therefore the system is required to automatically adjust the supply of the chilled water to adapt to the change of the end load.
However, the existing air conditioning system only adapts to the changing load through simple increase and decrease of the number of the air conditioning host and the water pump, only a simple addition and subtraction method is performed on energy conservation, an optimal energy-saving combined operation mode cannot be considered, and the damage to the system caused by long-time operation and frequent starting of the air conditioning host and the water pump is not considered.
Disclosure of Invention
In view of the above, there is a need for an improved system adjusting method and an air conditioning system using the same, the system adjusting method can achieve energy-saving adjustment of the air conditioning system, and the air conditioning system using the method has a combined operation mode with better energy-saving performance.
The invention provides a system adjusting method, which is used for adjusting the running state of an air conditioning system and comprises the following steps:
collecting parameters of an air conditioning system;
calculating the collected parameters of the air conditioning system to obtain the deviation delta G of the system efficiency value;
and adjusting the running state of an air-conditioning host machine and the running state of a water pump in the air-conditioning system according to the system efficiency value deviation delta G, so that the adjusted system efficiency value deviation delta G of the air-conditioning system is in the minimum positive value in the system adjusting range or equal to zero.
Further, the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is within a minimum positive value in a system adjusting range or equal to zero includes, when Δ G < 0:
comparing the delta G with the rated efficiency values of all the air conditioner main machines which are not operated;
if the absolute delta G is less than or equal to the minimum value of the rated efficiency values of all the air-conditioning hosts which do not operate, starting the air-conditioning host with the lowest rated efficiency value in the air-conditioning hosts which do not operate;
if the absolute delta G is between the rated efficiency values of two air-conditioning hosts in all the air-conditioning hosts which do not operate, starting the air-conditioning host with a relatively higher rated efficiency value in the two air-conditioning hosts;
if the delta G is larger than the maximum value of the rated efficiency values of all the air-conditioning hosts which are not operated, starting the air-conditioning host with the maximum rated efficiency value in all the air-conditioning hosts which are not operated, and then taking the delta G and the rated efficiency value Q of the air-conditioning hostimaxAnd the absolute value of the sum is used as the adjusted | delta G | and the step of comparing the | delta G | with the rated efficiency value of all the air conditioner main units which are not operated is returned.
Further, in the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at the minimum positive value within the system regulation range or equal to zero, when two or more air-conditioning main units have the same rated efficiency value, the air-conditioning main unit with shorter operation time is preferentially started.
Further, the step of adjusting the operation state of the air-conditioning host and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at a minimum positive value within the system regulation range or equal to zero includes, when Δ G > 0:
comparing the delta G with the rated efficiency values of all the running air-conditioning main machines;
if the delta G is smaller than the minimum value of the rated efficiency values of all the running air-conditioning hosts, the running states of all the air-conditioning hosts in the air-conditioning system are not adjusted;
if the delta G is between the rated efficiency values of two air-conditioning hosts in all the running air-conditioning hosts, stopping the air-conditioning host with relatively low rated efficiency value in the two air-conditioning hosts;
if delta G is larger than the maximum value of the rated efficiency values of all the running air-conditioning hosts, stopping the air-conditioning host with the maximum rated efficiency value in all the non-running air-conditioning hosts, and then taking the delta G and the rated efficiency value Q of the air-conditioning hostimaxAnd comparing the absolute value of the difference with the rated efficiency values of all the rest air-conditioning main machines which are not operated, and returning to the step of comparing the deltaG with the rated efficiency values of all the operated air-conditioning main machines.
Further, in the step of adjusting the operation state of the air-conditioning main unit in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at the minimum positive value within the system regulation range or equal to zero, when two or more air-conditioning main units have the same rated efficiency value, the air-conditioning main unit with longer operation time is preferentially stopped.
Further, the step of adjusting the operation state of the air conditioning main unit in the air conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air conditioning system is a minimum positive value within the system regulation range or equal to zero includes, when Δ G is 0:
the running states of an air conditioner host and a water pump in the air conditioning system do not need to be adjusted.
Further, the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is within a minimum positive value in a system adjustment range or equal to zero includes, when Δ G < 0:
gradually increasing the operating frequency of the water pump which is not operated in the full frequency state, and finishing the adjusting process if delta G is 0 after the frequency increasing operation;
and if delta G is still less than 0 after the frequency-increasing operation of all the water pumps which are put into operation, starting the water pump with the lowest operation time in all the rest water pumps, if delta G is 0 after the frequency-increasing operation of the water pumps, indicating that the adjustment is finished, and if delta G is still less than 0, repeating the step until delta G is 0 or all the water pumps are put into operation and in a full-frequency operation state.
Furthermore, in the step of gradually increasing the operating frequency of the water pump which is not operated in the full frequency state, and completing the adjusting process if Δ G is 0 after the frequency increasing operation, the frequency increasing operation is preferentially performed from the water pump with higher power.
Further, the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is within a minimum positive value in a system adjusting range or equal to zero includes, when Δ G > 0:
gradually reducing the frequency of a water pump which is not operated in a full-frequency state in the water pumps which are put into operation, and finishing the adjusting process if delta G is 0 after the frequency reduction operation;
and if the water pump which is not operated in the full frequency state and has the minimum power is closed and the delta G is still larger than 0, the frequency of the water pump which is not operated in the full frequency state and has the minimum power is continuously reduced from the rest of the water pumps, and the step is repeated until the delta G is equal to 0.
Further, in the step of gradually reducing the frequency of the water pump not operated in the full frequency state among the water pumps put into operation and completing the adjustment process if Δ G after the frequency-reduced operation is 0, the frequency of the water pump not operated in the full frequency state and/or the water pump having the minimum power is preferentially reduced.
Further, in the step of calculating the collected parameters of the air conditioning system to obtain the system efficiency value deviation Δ G, the method further includes:
and calculating the deviation delta W of the water pump efficiency value.
Further, in the step of starting the water pumps which are not put into operation yet, ensuring that the deviation of the water pump efficiency value Δ W is less than the power of the remaining minimum water pumps when the water pumps which are not put into operation yet are started.
Further, in the step of calculating the collected parameters of the air conditioning system to obtain the system efficiency value deviation Δ G, the method further includes:
and calculating the deviation delta W of the water pump efficiency value.
Further, after the water pump which is not operated in the full frequency state and has the minimum power is turned off and Δ G is still larger than 0, the frequency of the water pump which is not operated in the full frequency state and has the minimum power is continuously reduced in the remaining water pumps, and the step is repeated until Δ G is equal to 0, and when the number of the water pumps which are not operated in the full frequency state and have the minimum power is two or more, the operation frequency of the water pump with the large operation time is preferentially reduced; when the number of the water pumps which are put into operation is reduced, the deviation delta W of the efficiency value of the water pump is ensured to be smaller than the power of the residual minimum water pump.
Further, the step of calculating the water pump efficiency value deviation Δ W includes:
calculating the total power W of the running water pump;
calculating the required power W' of the running water pump;
and calculating the efficiency deviation delta W of the water pump.
Further, the step of calculating the collected parameters of the air conditioning system to obtain the system efficiency value deviation Δ G includes:
calculating the rated efficiency value Q of each air conditioner main uniti′；
Calculating the total efficiency value Q of the air conditioner host in the running state;
calculating the end demand;
calculating the system efficiency value deviation Delta G.
The invention also provides an air conditioning system, which comprises a plurality of air conditioning hosts and a plurality of water pumps which are mutually matched, wherein the air conditioning system adopts the air conditioning system adjusting method to adjust the running states of the air conditioning hosts and the water pumps.
The system adjusting method provided by the invention can appropriately adjust the running states of the air conditioner host and the water pump which are put into parallel running, and can ensure that the combination of the air conditioner host and the water pump which are put into running after being adjusted is in a running state with optimal efficiency and lowest energy consumption, thereby achieving the purposes of energy conservation and emission reduction. The air conditioning system using the method has a combined operation mode with better energy-saving performance and wide application prospect.
Drawings
Fig. 1 is a schematic flow chart of a system adjustment method according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of step S13 at Δ G <0 in the system adjusting method according to the first embodiment of the present invention.
Fig. 3 is a schematic flow chart of step S13 when Δ G >0 in the system adjustment method according to the first embodiment of the present invention.
Fig. 4 is a schematic flow chart of step S13 at Δ G <0 in the system adjusting method according to the second embodiment of the present invention.
Fig. 5 is a schematic flow chart of step S13 when Δ G >0 in the system adjusting method according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic flow chart of a system adjusting method in an embodiment of the present invention, and the system adjusting method is used for implementing combined adjustment of an air conditioning host and a water pump when a load of an air conditioning system changes, optimizing an operation state of the air conditioning host and the water pump in the air conditioning system when the load currently changes, and reducing energy consumption on the premise of ensuring that the air conditioning system meets a use requirement, thereby implementing energy saving and emission reduction on an operation process of the air conditioning system.
An air conditioning system generally needs to adopt a plurality of air conditioning hosts and a plurality of water pumps to run in parallel and in a matched manner, and the air conditioning hosts realize refrigeration or heating through the continuous circulation of a refrigerant in a compressor, a condenser, a throttling device and an evaporator in the air conditioning hosts; the water pump is used for pumping chilled water, so that the chilled water which is subjected to cold and hot interaction with the condenser can enter a fan coil of the air conditioner main machine, and then cold and hot exchange is carried out indoors, so that the purpose of refrigeration or heating is achieved.
The end load of the air conditioning system is constantly changing, and when the end load changes, the air conditioning system needs to adjust the supply amount of chilled water to accommodate the change in the end load. When the load increases, the air conditioning system needs to increase the water supply amount of the chilled water; when the load is reduced, the air conditioning system needs to reduce the amount of supply of chilled water.
The existing air conditioning system generally matches the changing load by increasing or decreasing the number of the air conditioning main unit and the water pump and changing the operation number of the air conditioning main unit and the water pump. The load demand can be satisfied by changing the number of the air-conditioning hosts, the load demand can be satisfied by changing the number of the water pumps, and the load demand can be satisfied by changing the number of the air-conditioning hosts and the water pumps. However, the existing air conditioning system cannot judge which adjustment mode is the best selection, which leads to the fact that the air conditioning system may be similar to an unreasonable adjustment condition that only one low-power water pump needs to be added to meet the load requirement, and actually one high-power air conditioning host is added.
On the premise of meeting the load requirement, the number and the operation state of the air conditioner main units and the water pumps which need to be put into parallel operation are different, and the air conditioner main units and the water pumps are determined to have an operation scheme with optimal power and lowest energy consumption. The system adjusting method provided by the invention is used for adjusting the number and the operation state of the air-conditioning host and the water pump which are put into parallel operation, and can ensure that the combination of the air-conditioning host and the water pump which are put into operation after being adjusted is in the operation state with optimal efficiency and lowest energy consumption, thereby achieving the purposes of energy conservation and emission reduction.
The following explains a specific flow of a system adjustment method, which includes:
s11: parameters of the air conditioning system are collected. Specifically, the temperature of a water supply main pipe, the pressure of the water supply main pipe, the temperature of a water return main pipe, the pressure of the water return main pipe and the flow of the main pipe of the air-conditioning system need to be collected; the water supply temperature, the water supply flow, the cold and heat quantity and the operation time of each air conditioner host; and the rated power, the running frequency and the running time of each water pump.
In this embodiment, the temperature data may be measured by using a temperature sensor, the pressure data may be measured by using a pressure sensor, the flow amount may be measured by using a flow meter, the operation time data may be counted by a timer, the frequency data may be obtained by feedback from a frequency converter, and the cold and heat amount of each air conditioner host and the rated power of each water pump may be found on the corresponding equipment nameplate. Referring to tables 1 and 2, table 1 is an information collection table of partial data of the system adjustment method according to an embodiment of the present invention, where the partial data in the embodiment is measured by a sensor, and table 1 identifies the type and the installation position of the sensor corresponding to each data; table 2 is a table of collected information of another part of data of the system adjusting method according to one embodiment of the present invention, the part of data is obtained by system feedback or equipment nameplate statistics.
Table 1 table of collected information of partial data in one embodiment of the present invention
Table 2 another part of data collection information table in one embodiment of the present invention
It is to be understood that the present invention is not limited to the above-mentioned data being collected only by the above-mentioned method, and is not limited to the installation position when the data is collected by the sensor.
S12: and calculating the acquired parameters of the air conditioning system, and calculating to obtain the deviation delta G of the system efficiency value. Specifically, the system efficiency value deviation Δ G is calculated as follows:
(1) the system efficiency value deviation Δ G is calculated as follows:
calculating the rated efficiency value Q of each air conditioner main uniti′：
Qi′＝ξiQi(i is from 1 to n); wherein n is the number of air conditioning hosts in the air conditioning system, QiIs the cold and heat quantity, xi, of the ith air conditioner main machineiEfficiency of the ith air conditioner host;
rated efficiency value QiThe rated power and rated efficiency value Q of a single air conditioner main uniti' the capability of cooling/heating of a single air-conditioning main unit is represented, and the rated efficiency value Qi' higher, representing higher cooling/heating capacity of the air conditioner main unit; rated efficiency value Qi' lower, representing a lower cooling/heating capacity of the main air conditioner.
Calculating the total efficiency value Q of the air conditioner host in the running state:
the total efficiency value Q is an accumulated value of rated power values of the air-conditioning host in an operating state in the air-conditioning system, namely the total operating power of the air-conditioning system, represents the refrigerating/heating capacity of the air-conditioning system, and is higher and represents the refrigerating/heating capacity of the air-conditioning system; the lower total efficiency value Q represents a lower cooling/heating capacity of the air conditioning system.
Calculating end demand G0：
G0＝F0×|TTh-TTg|。
When the air conditioning system is refrigerating, the chilled water enters the room in a relatively high-temperature environmentHeat exchange, so return manifold temperature TThHigher than temperature TT of water maingI.e. during refrigeration G0＝F0×(TTh-TTg)；
When the air conditioning system heats, the chilled water exchanges heat with the relatively low-temperature indoor environment, so that the temperature TT of the return water header pipehBelow the temperature of the water main TTgTemperature of (i.e. during heating G)0＝F0×(TTg-TTh)。
Calculating the system efficiency value deviation delta G:
△G＝Q-G0
the system efficiency value deviation delta G is the difference value between the power sum of an air-conditioning host machine in an operating state in the air-conditioning system and the load demand, namely the difference value between the operating total power and the demand total power of the air-conditioning system, and represents the supply-demand relation of the air-conditioning system, and when the delta G is greater than 0, the actual operating total power of the air-conditioning system exceeds the demand of the load and is in a working state of more supply than demand; when delta G is less than 0, the total actual operation power of the air conditioning system is lower than the requirement of the load, and the air conditioning system is in a working state of short supply and short demand; when Δ G is equal to 0, the total power of the actual operation of the air conditioning system is equal to the demand of the load, and the air conditioning system is in a working state of balanced supply and demand.
In another embodiment of the present invention, the step S12 further includes the following step:
and calculating the collected parameters of the air conditioning system, and calculating to obtain the efficiency deviation value delta W of the water pump.
(2) The calculation process of the water pump efficiency deviation value delta W is as follows:
calculating the total power W of the running water pump:
calculating the power W' required by the running water pump:
Calculating the efficiency deviation delta W of the water pump:
△W＝W-W′。
the water pump efficiency deviation delta W represents the supply and demand relation between the water pump and the load in the air conditioning system, when the delta W is greater than 0, the actual running total power of the water pump exceeds the demand of the load and is in a working state that the supply and demand are greater than the demand; when delta W is less than 0, the total actual operation power of the water pump is lower than the load requirement, and the water pump is in a working state of short supply and short demand; when the delta W is equal to 0, the total actual operation power of the water pump is just equal to the demand of the load, and the water pump is in a supply and demand balanced working state.
S13: and adjusting the running state of an air-conditioning host machine and the running state of a water pump in the air-conditioning system according to the system efficiency value deviation delta G, so that the adjusted system efficiency value deviation delta G of the air-conditioning system is in the minimum positive value in the system adjusting range or equal to zero.
The following is an analysis of step S13 when Δ G is 0:
when the Δ G is equal to 0, the calculated system efficiency value deviation representing the air conditioning system is 0, that is, the total efficiency value of the air conditioning system in operation is equivalent to the supply and demand value of the terminal load, and the system efficiency value deviation Δ G is in the optimal state within the system regulation range, at this time, the air conditioning system does not need to adjust the operation state of the air conditioning host in the air conditioning system.
That is, step S13 includes:
step S131: the running states of an air conditioner host and a water pump in the air conditioning system do not need to be adjusted.
Referring to fig. 2 to 3 together, fig. 2 is a schematic flow chart of step S13 at Δ G <0 in the system adjusting method according to the first embodiment of the present invention, and fig. 3 is a schematic flow chart of step S13 at Δ G >0 in the system adjusting method according to the first embodiment of the present invention.
The following is an analysis of the adjustment process of the air conditioner master in step S13 if Δ G is not equal to 0:
(1) when Δ G is less than 0, it represents that the deviation of the calculated system efficiency value of the air conditioning system is less than 0, that is, the total efficiency value of the air conditioning system in operation is less than the supply and demand value of the terminal load, and at this time, the air conditioning system cannot completely meet the operation requirement of the terminal load, and the total efficiency value of the air conditioning system in operation needs to be increased.
Comparing the delta G with the rated efficiency values of all the air conditioner hosts which are not operated;
if the absolute delta G is less than or equal to the minimum value of the rated efficiency values of all the air-conditioning main machines which are not operated, namely the absolute delta G is less than or equal to min (Q)i') (i is from 1 to n), starting the air-conditioning host with the lowest rated efficiency value in the air-conditioning hosts which are not operated;
and thirdly, if the delta G is between the rated efficiency values of two air-conditioning hosts in all the air-conditioning hosts which do not operate, starting the air-conditioning host with a relatively high rated efficiency value in the two air-conditioning hosts.
If the delta G is larger than the maximum value of the rated efficiency values of all the air-conditioning hosts which are not operated, starting the air-conditioning host with the maximum rated efficiency value in all the air-conditioning hosts which are not operated, and then taking the delta G and the rated efficiency value Q of the air-conditioning hostimaxThe absolute value of the sum ofimaxComparing | with the rated efficiency values of all the rest air conditioner hosts which are not operated, and repeating the adjusting process, thereby completing the adjustment of the operation state of the air conditioner hosts.
That is, step S13 includes:
step S131: and comparing the deltaG with the rated efficiency value of all the air conditioner main machines which are not operated.
Step S132: and if the absolute delta G is less than or equal to the minimum value of the rated efficiency values of all the air-conditioning hosts which do not operate, starting the air-conditioning host with the lowest rated efficiency value in the air-conditioning hosts which do not operate.
Step S133: and if the absolute delta G is between the rated efficiency values of two air-conditioning main machines in all the air-conditioning main machines which do not operate, starting the air-conditioning main machine with a relatively higher rated efficiency value in the two air-conditioning main machines.
Step S134: if the delta G is larger than the maximum value of the rated efficiency values of all the air-conditioning hosts which are not operated, starting the air-conditioning host with the maximum rated efficiency value in all the air-conditioning hosts which are not operated, and then taking the delta G and the rated efficiency value Q of the air-conditioning hostimaxThe absolute value of the sum is used as adjusted | Δ G |, and the process returns to step S131.
(2) When Δ G >0, the deviation of the calculated system efficiency value representing the air conditioning system is greater than 0, that is, the total efficiency value of the air conditioning system in operation is greater than the supply and demand values of the terminal load, and at this time, the production value of the air conditioning system exceeds the operation demand of the terminal load, and the total efficiency value of the air conditioning system in operation needs to be reduced.
Comparing the delta G with the rated efficiency values of all running air conditioner main machines:
if delta G is less than the minimum value of rated efficiency values of all running air-conditioning main units, i.e. | delta G _ non-woven ray<min(Qi') (i from 1 to n), the operating status of all air conditioning hosts in the air conditioning system is not adjusted.
If delta G is between the rated efficiency values of two air-conditioning main machines in all the running air-conditioning main machines, stopping the air-conditioning main machine with relatively low rated efficiency value in the two air-conditioning main machines.
If delta G is larger than the maximum value of the rated efficiency values of all the running air-conditioning main machines, stopping the air-conditioning main machine with the maximum rated efficiency value in all the running air-conditioning main machines, and then taking the delta G and the rated efficiency value Q of the air-conditioning main machineimaxThe absolute value of the difference, i.e. | Δ G + QimaxComparing | with the rated efficiency values of all the rest running air conditioner hosts, and repeatedly adjusting the process, thereby completing the adjustment of the running state of the air conditioner hosts.
That is, step S13 includes:
step S131: comparing the delta G with the rated efficiency values of all the running air conditioner main machines.
Step S132: and if the delta G is smaller than the minimum value of the rated efficiency values of all the running air-conditioning main machines, not adjusting the running states of all the air-conditioning main machines in the air-conditioning system.
Step S133: if the Δ G is between the rated efficiency values of two air-conditioning hosts of all the operating air-conditioning hosts, the air-conditioning host with the relatively low rated efficiency value of the two air-conditioning hosts is stopped.
Step S134: if the delta G is larger than the maximum value of the rated efficiency values of all the running air-conditioning hosts, stopping the air-conditioning host with the maximum rated efficiency value in all the running air-conditioning hosts, and then taking the delta G and the rated efficiency value Q of the air-conditioning hostimaxThe absolute value of the difference is compared with the rated efficiency values of all the remaining air-conditioning main units in operation, and the process returns to step S131.
When the air conditioning system needs to increase the efficiency value of the air conditioning host which is put into operation, namely the air conditioning system is in a 'supply short demand' state, the system adjusting method can start a proper number of air conditioning hosts; when the air conditioning system needs to reduce the efficiency value of the air conditioning host which is put into operation, namely the air conditioning system is in a 'supply over demand' state, the system adjusting method can stop operating the air conditioning hosts with proper quantity, so that the energy consumption of the air conditioning system is reduced.
In order to further reduce the energy consumption of the air conditioning system and improve the operation stability of equipment in the air conditioning system, when the air conditioning hosts are started, when two or more air conditioning hosts have the same rated efficiency value, the air conditioning hosts with shorter operation time are preferentially started; when the air-conditioning main machine is stopped, when two or more air-conditioning main machines have the same rated efficiency value, the air-conditioning main machine with longer running time is stopped preferentially. The air conditioner main machine can run alternately, the continuous running time of a single air conditioner main machine is reduced, and the damage caused by long-time running of the air conditioner main machine is avoided.
The following is an analysis of the process of adjusting the operating state of the water pump in step S13 if Δ G is not equal to 0:
referring to fig. 4 to 5 together, fig. 4 is a schematic flow chart of step S13 at Δ G <0 in the system adjustment method according to the second embodiment of the present invention, and fig. 5 is a schematic flow chart of step S13 at Δ G >0 in the system adjustment method according to the second embodiment of the present invention.
(1) When the delta G is less than 0, the deviation of the calculated system efficiency value of the air conditioning system is smaller than 0, namely the total efficiency value of the air conditioning system in operation is smaller than the supply and demand value of the tail end load, at the moment, the air conditioning system cannot completely meet the operation requirement of the tail end load, and the water supply flow rate of the water pump and the efficiency value in operation need to be increased.
Gradually increasing the operating frequency of a water pump which does not operate in a full-frequency state, and finishing an adjusting process if delta G is 0 after frequency increasing operation;
if the delta G of all the water pumps which are put into operation is still less than 0 after the frequency-increasing operation, starting the water pump with the lowest operation time in the rest of the water pumps, if the delta G of the water pumps which are put into operation is 0 after the frequency-increasing operation, indicating that the adjustment is finished, and if the delta G of the water pumps which are put into operation is still less than 0, repeating the step until the delta G is 0 or all the water pumps are put into operation and in a full-frequency operation state.
That is, step S13 includes:
step S131: and gradually increasing the operating frequency of the water pump which is not operated in the full-frequency state, and finishing the adjusting process if delta G is 0 after the frequency increasing operation.
Step S132: and if the delta G of all the water pumps which are put into operation is still less than 0 after the frequency-increasing operation, starting the water pump with the lowest operation time in the rest of the water pumps, if the delta G of the water pumps which are put into operation is 0 after the frequency-increasing operation, indicating that the adjustment is finished, and if the delta G of the water pumps which are put into operation is still less than 0, repeating the step until the delta G is 0 or all the water pumps are put into operation and in a full-frequency operation state.
Preferably, in step S131, the frequency of the water pump with higher power is preferentially increased among all the water pumps put into operation. At the moment, the number of the water pumps running at the full frequency can be reduced, and the unreasonable running state that a plurality of water pumps with lower power run at the full frequency and a plurality of water pumps with higher power run at the low frequency is avoided.
Preferably, in step S132, when the water pump not yet put into operation is started, the water pump efficiency value deviation Δ W is ensured to be smaller than the power of the remaining minimum water pump. At the moment, the unreasonable running state that a plurality of water pumps run at the same time under low frequency can be avoided.
It can be understood that, if the unreasonable operation state that the plurality of water pumps operate simultaneously at low frequencies is not considered, the water pump efficiency value deviation Δ W in the step S12 does not need to be calculated, and it is not necessary to ensure that the water pump efficiency value deviation Δ W is smaller than the power of the remaining minimum water pump.
(2) When the delta G is greater than 0, the deviation of the calculated system efficiency value of the air conditioning system is larger than 0, namely the total efficiency value of the air conditioning system in operation is larger than the supply and demand value of the tail end load, at the moment, the air conditioning system exceeds the operation requirement of the tail end load, and the water supply flow rate of the water pump and the efficiency value in operation need to be reduced.
Gradually reducing the frequency of a water pump which is not operated in a full-frequency state in water pumps which are put into operation, and finishing an adjusting process if delta G is 0 after the frequency reduction operation;
if the water pump with the minimum power which is not operated in the full frequency state in the water pumps which are put into operation is closed, the frequency of the water pump with the minimum power which is not operated in the full frequency state in the residual water pumps is continuously reduced, and the step is repeated until the frequency delta G is 0 or all the water pumps in the air-conditioning system are closed.
That is, step S13 includes:
step S131: and gradually reducing the frequency of the water pump which is not operated in a full frequency state in the water pumps which are put into operation, and finishing the adjusting process if delta G is 0 after the frequency reduction operation.
Step S132: and if the water pump which is not operated in the full frequency state and has the minimum power is closed and the delta G is still larger than 0, the frequency of the water pump which is not operated in the full frequency state and has the minimum power is continuously reduced from the rest of the water pumps, and the step is repeated until the delta G is equal to 0.
Preferably, in step S131, the frequency of the water pumps not operating at the full frequency and/or the minimum power is preferentially reduced among all the water pumps put into operation. Preferably, in step S132, when the number of the water pumps which are not operated in the full frequency state and have the minimum power is two or more, the operation frequency of the water pump having the larger operation time is preferentially reduced; when the number of the water pumps which are put into operation is reduced, the deviation delta W of the efficiency value of the water pump is ensured to be smaller than the power of the residual minimum water pump. At the moment, the unreasonable running state that a plurality of water pumps run at the same time under low frequency can be avoided.
It can be understood that, if the unreasonable operation state that the plurality of water pumps operate simultaneously at low frequencies is not considered, the water pump efficiency value deviation Δ W in the step S12 does not need to be calculated, and it is not necessary to ensure that the water pump efficiency value deviation Δ W is smaller than the power of the remaining minimum water pump.
When the air conditioning system needs to increase the supply and demand values of the water pumps which are put into operation, namely the air conditioning system is in a 'supply short demand' state, the system adjusting method can increase the operation frequency of the water pumps or increase the number of the water pumps which are put into operation; when the air conditioning system needs to reduce the supply and demand values of the water pumps which are put into operation, namely the air conditioning system is in a 'supply and demand' state, the system adjusting method can reduce the operation frequency of the water pumps or reduce the number of the water pumps which are put into operation.
The invention also provides an air conditioning system which is adjusted by using the system adjusting method, and the air conditioning system can enable the combination of the adjusted air conditioning host and the water pump which are put into operation to be in an operation state with optimal efficiency and lowest energy consumption by using the adjusting method.
The system adjusting method provided by the invention can appropriately adjust the running states of the air conditioner host and the water pump which are put into parallel running, and can ensure that the combination of the air conditioner host and the water pump which are put into running after being adjusted is in a running state with optimal efficiency and lowest energy consumption, thereby achieving the purposes of energy conservation and emission reduction. The air conditioning system using the method has a combined operation mode with better energy-saving performance and wide application prospect.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (16)
1. A system adjusting method for adjusting an operation state of an air conditioning system, the system adjusting method comprising:
collecting parameters of an air conditioning system;
calculating the collected parameters of the air conditioning system to obtain the deviation delta G of the system efficiency value;
adjusting the running state of an air-conditioning host machine and the running state of a water pump in the air-conditioning system according to the system efficiency value deviation delta G, so that the adjusted system efficiency value deviation delta G of the air-conditioning system is in the minimum positive value or equal to zero in the system adjusting range;
at Δ G <0, comprising:
comparing the delta G with the rated efficiency values of all the air conditioner main machines which are not operated;
if the absolute delta G is less than or equal to the minimum value of the rated efficiency values of all the air-conditioning hosts which do not operate, starting the air-conditioning host with the lowest rated efficiency value in the air-conditioning hosts which do not operate;
if the absolute delta G is between the rated efficiency values of two air-conditioning hosts in all the air-conditioning hosts which do not operate, starting the air-conditioning host with a relatively higher rated efficiency value in the two air-conditioning hosts;
if the delta G is larger than the maximum value of the rated efficiency values of all the air-conditioning hosts which are not operated, starting the air-conditioning host with the maximum rated efficiency value in all the air-conditioning hosts which are not operated, and then taking the delta G and the rated efficiency value Q of the air-conditioning hosti maxAnd the absolute value of the sum is used as the adjusted | delta G | and the step of comparing the | delta G | with the rated efficiency value of all the air conditioner main machines which are not operated is returned.
2. The system adjusting method according to claim 1, wherein in the step of adjusting the operating state of the air-conditioning main unit and the operating state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at a minimum positive value within the system adjusting range or equal to zero, when two or more air-conditioning main units have the same rated efficiency value, the air-conditioning main unit having a shorter operating time is preferentially activated.
3. The system adjusting method according to claim 1, wherein the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at a minimum positive value within the system adjusting range or equal to zero comprises, when Δ G > 0:
comparing the delta G with the rated efficiency values of all the running air conditioner main machines;
if the delta G is smaller than the minimum value of the rated efficiency values of all the running air-conditioning hosts, the running states of all the air-conditioning hosts in the air-conditioning system are not adjusted;
if the delta G is between the rated efficiency values of two air-conditioning hosts in all the running air-conditioning hosts, stopping the air-conditioning host with relatively low rated efficiency value in the two air-conditioning hosts;
if the delta G is larger than the maximum value of the rated efficiency values of all the running air-conditioning hosts, stopping the air-conditioning host with the maximum rated efficiency value in all the running air-conditioning hosts, and then taking the delta G and the rated efficiency value Q of the air-conditioning hosti maxAnd comparing the absolute value of the difference with the rated efficiency values of all the rest running air-conditioning main machines, and returning to the step of comparing the delta G with the rated efficiency values of all the running air-conditioning main machines.
4. The system adjusting method according to claim 3, wherein in the step of adjusting the operation state of the air-conditioning main units in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at a minimum positive value within the system adjusting range or equal to zero, when two or more air-conditioning main units have the same rated efficiency value, the air-conditioning main unit having a longer operation time is preferentially stopped.
5. The system adjusting method according to claim 1, wherein the step of adjusting the operation state of the main air conditioner in the air conditioning system according to the system efficiency value deviation Δ G such that the adjusted system efficiency value deviation Δ G of the air conditioning system is at a minimum positive value within the system adjusting range or equal to zero comprises, when Δ G is 0:
the running states of an air conditioner host and a water pump in the air conditioning system do not need to be adjusted.
6. The system adjusting method according to claim 1, wherein the step of adjusting the operation state of the air conditioning main unit and the operation state of the water pump in the air conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air conditioning system is at a minimum positive value within the system adjusting range or equal to zero comprises, when Δ G < 0:
gradually increasing the operating frequency of the water pump which is not operated in the full frequency state, and finishing the adjusting process if delta G is 0 after the frequency increasing operation;
and if the delta G of all the water pumps which are put into operation is still less than 0 after the frequency-increasing operation, starting the water pump with the lowest operation time in the rest of the water pumps, if the delta G of the water pumps which are put into operation is 0 after the frequency-increasing operation, indicating that the adjustment is finished, and if the delta G of the water pumps which are put into operation is still less than 0, repeating the step until the delta G is 0 or all the water pumps are put into operation and in a full-frequency operation state.
7. The system adjustment method according to claim 6, wherein in the step of gradually increasing the operating frequency of the water pump that is not operated in the full frequency state and completing the adjustment process if Δ G is 0 after the up-frequency operation, the up-frequency operation is preferentially performed from the water pump having a larger power.
8. The system adjusting method according to claim 1, wherein the step of adjusting the operation state of the air-conditioning main unit and the operation state of the water pump in the air-conditioning system according to the system efficiency value deviation Δ G so that the adjusted system efficiency value deviation Δ G of the air-conditioning system is at a minimum positive value within the system adjusting range or equal to zero comprises, when Δ G > 0:
gradually reducing the frequency of a water pump which is not operated in a full-frequency state in the water pumps which are put into operation, and finishing the adjusting process if delta G is 0 after the frequency reduction operation;
and if the water pump which is not operated in the full frequency state and has the minimum power is closed and the delta G is still larger than 0, the frequency of the water pump which is not operated in the full frequency state and has the minimum power is continuously reduced from the rest of the water pumps, and the step is repeated until the delta G is equal to 0.
9. The system adjusting method according to claim 8, wherein in the step of gradually reducing the frequency of the water pump which is not operated in the full frequency state among the water pumps which are put into operation, and completing the adjusting process if Δ G is 0 after the frequency-reduced operation, the frequency of the water pump which is not operated in the full frequency state and/or the power-minimum water pump is preferentially reduced.
10. The system adjustment method according to claim 6, wherein the step of calculating the deviation Δ G of the system efficiency value by calculating the collected parameters of the air conditioning system further comprises:
and calculating the deviation delta W of the water pump efficiency value.
11. The system adjusting method according to claim 10, wherein the step of starting the water pump with the lowest operation time among the remaining water pumps if Δ G is still less than 0 after the frequency-increasing operation of all the water pumps put into operation, indicating that the adjustment is completed if Δ G is 0 after the frequency-increasing operation of the water pumps, and repeating the step until Δ G is 0 or all the water pumps are put into operation and in a full-frequency operation state if Δ G is still less than 0, and when starting the water pumps not yet put into operation, ensuring that the deviation Δ W of the water pump efficiency value is less than the power of the remaining minimum water pump.
12. The system adjustment method according to claim 8, wherein the step of calculating the deviation Δ G of the system efficiency value by calculating the collected parameters of the air conditioning system further comprises:
and calculating the deviation delta W of the water pump efficiency value.
13. The system adjusting method according to claim 12, wherein after the water pump that is not operated in the full frequency state and has the minimum power is turned off, Δ G is still greater than 0, the frequency of the water pump that is not operated in the full frequency state and has the minimum power is continuously decreased, and the present step is repeated until Δ G is 0, and when the number of the water pumps that are not operated in the full frequency state and have the minimum power is two or more, the operation frequency of the water pump having the large operation time is preferentially decreased; when the number of the water pumps which are put into operation is reduced, the deviation delta W of the efficiency value of the water pump is ensured to be smaller than the power of the residual minimum water pump.
14. The system regulation method of claim 10 or 12 wherein the step of calculating a water pump efficiency value deviation aw comprises:
calculating the total power W of the running water pump;
calculating the required power W' of the running water pump;
and calculating the efficiency deviation delta W of the water pump.
15. The system adjustment method of claim 1, wherein the step of calculating the collected parameters of the air conditioning system to obtain the deviation Δ G of the system efficiency value comprises:
calculating the rated efficiency value Q of each air conditioner main uniti′；
Calculating the total efficiency value Q of the air conditioner host in the running state;
calculating the end demand;
calculating the system efficiency value deviation Delta G.
16. An air conditioning system, characterized in that the air conditioning system comprises a plurality of air conditioning hosts and a plurality of water pumps which are matched with each other, and the air conditioning system adjusts the operating states of the air conditioning hosts and the water pumps by adopting the air conditioning system adjusting method according to any one of claims 1 to 15.
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