CN113339972A - Water system control method and device and storage medium - Google Patents
Water system control method and device and storage medium Download PDFInfo
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- CN113339972A CN113339972A CN202110634191.7A CN202110634191A CN113339972A CN 113339972 A CN113339972 A CN 113339972A CN 202110634191 A CN202110634191 A CN 202110634191A CN 113339972 A CN113339972 A CN 113339972A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 453
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004378 air conditioning Methods 0.000 claims abstract description 36
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000008400 supply water Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 3
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- 230000009467 reduction Effects 0.000 description 8
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- 238000005265 energy consumption Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
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- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
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- 238000004781 supercooling Methods 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
- F24F11/62—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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses a water system control method, a water system control device and a storage medium. Wherein, the water system is applied to the air conditioning system, and the method comprises the following steps: acquiring the water valve type of each target position water valve in the air-conditioning system; acquiring demand information of the air conditioner terminal according to the type of the water valve; determining a set value of a differential pressure switch in the water system according to the demand information; and determining a water supply temperature set value and a pressure signal according to the set values. The invention solves the technical problem of unstable differential pressure control of a water system.
Description
Technical Field
The invention relates to the field of computers, in particular to a water system control method, a water system control device and a storage medium.
Background
In the total energy consumption of China, the building energy consumption occupies a great proportion and shows a trend of increasing year by year, along with the continuous improvement of the requirements of people on the indoor air quality, the occupation ratio of the energy consumption of a central air conditioning system in the building energy consumption is increased year by year, and the central air conditioning system becomes an important direction for the research of the building energy-saving field.
The central air-conditioning water system has various problems of unbalanced hydraulic power, low water pump efficiency, large horse-drawn trolley and the like during operation, so that the energy waste of a conveying system is caused, and the system becomes a main direction for research of technicians in recent years. The currently common methods for controlling the differential pressure of a water system mainly comprise the following three methods: temperature difference control, constant pressure difference control and variable pressure difference control. In the above differential pressure control method, a continuous water regulating valve is mainly researched, and the setting of the system pressure is realized according to the opening feedback; and calculating the pressure set value of the on-off water valve in an equivalent water valve opening manner.
However, the current differential pressure calculation method for the on-off water valve cannot judge the supply and demand relationship of each end in real time, and the condition of partial area supercooling or overheating may exist; meanwhile, a differential pressure calculation method of a system shared by a continuous water valve and an on-off water valve is lacked, and a central air-conditioning water system of most buildings is the tail end of a mixed water valve.
Aiming at the problem that the differential pressure control of the water system is unstable, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a water system control method, a water system control device and a storage medium, which at least solve the technical problem of unstable differential pressure control of a water system.
According to an aspect of an embodiment of the present invention, there is provided a water system control method applied to an air conditioning system, the method including: acquiring the water valve type of each target position water valve in the air conditioning system; acquiring demand information of the air conditioner tail end according to the water valve type; determining a set value of a pressure difference switch in the water system according to the demand information; and determining a water supply temperature set value and a pressure signal according to the set value.
Optionally, the water valve types include: the water valve comprises a continuous adjusting type water valve, an on-off type water valve and a mixed type water valve, wherein the mixed type water valve is a combination of the continuous adjusting type water valve and the on-off type water valve; the demand information includes: and the opening degree value of the water valve corresponding to the continuously-adjusted water valve and the opening duration of the water valve corresponding to the on-off water valve are obtained.
Optionally, in a case that the water valve type is the continuously adjusting water valve, determining the setting value of the pressure difference switch in the water system according to the demand information includes: determining the maximum value of the water valve opening values according to the water valve opening value of each target position water valve in the air-conditioning system; and determining a set value of the differential pressure switch according to the maximum value in the opening value of the water valve.
Optionally, in a case that the water valve type is the continuously adjusting water valve, determining the water supply temperature set value and the pressure signal according to the set value includes: acquiring average supply and return water temperature differences of a preset number of target position water valves; and determining the set water supply temperature value and the pressure signal according to the average water supply and return temperature difference.
Optionally, when the water valve type is the on-off water valve, determining the set value of the pressure difference switch in the water system according to the demand information includes: determining a water valve opening proportion that the water valve opening duration exceeds a preset duration according to the water valve opening duration of each tail end position water valve in the air conditioning system in a preset time period; and determining a set value of the differential pressure switch according to the opening ratio of the water valve.
Optionally, in a case that the water valve is of the on-off type, determining the set value of the water supply temperature and the pressure signal according to the set value of the differential pressure switch includes: acquiring the duration of the set value; determining the water supply temperature set point and the pressure signal based on the duration.
Optionally, in a case that the water valve type is the mixed water valve, determining a set value of a pressure difference switch in the water system according to the demand information includes: determining a set value of a differential pressure switch corresponding to the continuous adjustment type water valve in the mixed type water valve as a first set value; determining a set value of a differential pressure switch corresponding to the on-off type water valve in the mixed type water valve as a second set value; and determining the final set value of the mixed water valve according to the first set value and the second set value.
Optionally, in a case that the water valve type is the hybrid water valve, determining the water supply temperature set value and the pressure signal according to the set value includes: setting the duration of a corresponding set value of the continuously-adjusted water valve in the mixed water valve as a first duration; setting the duration of a set value corresponding to the on-off type water valve in the mixed type water valve as a second duration; determining the supply water temperature setpoint and the pressure signal based on the first duration and the second duration.
According to another aspect of the embodiments of the present invention, there is also provided a water system control apparatus applied to an air conditioning system, the apparatus including: the first acquisition unit is used for determining the water valve type of each target position water valve in the air conditioning system; the second acquisition unit is used for acquiring the requirement information of the air conditioner tail end according to the water valve type; the first determining unit is used for determining a set value of a pressure difference switch in the water system according to the demand information; and the second determining unit is used for determining a water supply temperature set value and a pressure signal according to the set value.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, and when the program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the above-mentioned water system control method.
In the embodiment of the invention, the water valve type of each target position water valve in the air-conditioning system is obtained; acquiring demand information of the air conditioner terminal according to the type of the water valve; determining a set value of a differential pressure switch in the water system according to the demand information; the water supply temperature set value and the pressure signal are determined according to the set value, the pressure difference can be adjusted in real time according to the terminal demand signal, the correction of the pressure difference control is realized by adjusting the water supply temperature, and the stable change of the pressure difference is ensured, so that the technical effect of stably controlling the pressure difference of the water system is realized, and the technical problem of unstable pressure difference control of the water system is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a water system control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for calculating a set point and control logic for a differential pressure switch at the end of a continuously regulating water valve, according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for calculating a set value and control logic of a differential pressure switch at the end of an on-off water valve according to an embodiment of the invention;
fig. 4 is a schematic diagram of a water system control device according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, a water system control method embodiment is provided, it is noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for controlling a water system applied to an air conditioning system according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, acquiring the water valve type of each target position water valve in the air-conditioning system;
step S104, acquiring the demand information of the air conditioner terminal according to the water valve type;
step S106, determining a set value of a differential pressure switch in the water system according to the demand information;
and step S108, determining a water supply temperature set value and a pressure signal according to the set values.
In the embodiment of the invention, the water valve type of each target position water valve in the air-conditioning system is obtained; acquiring demand information of the air conditioner terminal according to the type of the water valve; determining a set value of a differential pressure switch in the water system according to the demand information; the water supply temperature set value and the pressure signal are determined according to the set value, the pressure difference can be adjusted in real time according to the terminal demand signal, the correction of the pressure difference control is realized by adjusting the water supply temperature, and the stable change of the pressure difference is ensured, so that the technical effect of stably controlling the pressure difference of the water system is realized, and the technical problem of unstable pressure difference control of the water system is solved.
It should be noted that the target position water valve is an air conditioner end water valve.
Optionally, the air conditioner terminal water valve is mainly divided into three types from the control form, namely a continuous adjustment type water valve, an on-off type water valve and a mixed type water valve, wherein the mixed type water valve is as follows: the combination of a continuously adjustable water valve and an on-off water valve.
Most of the continuous adjustment type water valves exist in a tail-end AHU unit, most of the on-off type water valves exist in a tail-end fan coil unit, and the mixed type water valves exist in a system with the two tail-end modes.
It should be noted that: an ahu (air Handle unit) refers to a combined air conditioning box, which mainly extracts indoor air (return air) and part of fresh air to control the outlet air temperature and the air volume and maintain the indoor temperature.
As an alternative embodiment, the water valve type includes: the water valve comprises a continuous adjusting type water valve, an on-off type water valve and a mixed type water valve, wherein the mixed type water valve is a combination of the continuous adjusting type water valve and the on-off type water valve; the demand information includes: and the opening degree value of the water valve corresponding to the continuously adjustable water valve and the opening duration of the water valve corresponding to the on-off water valve are continuously adjusted.
It should be noted that: the continuous adjustment type water valve is adjusted by controlling the opening value of the water valve; the on-off type water valve is adjusted by controlling the opening time of the water valve.
As an alternative embodiment, in the case that the water valve type is a continuously adjusting water valve, the determining the setting value of the pressure difference switch in the water system according to the demand information includes: determining the maximum value of the opening degree values of the water valves according to the opening degree value of the water valve of each target position in the air-conditioning system; and determining the set value of the differential pressure switch according to the maximum value in the opening value of the water valve.
According to the embodiment of the invention, under the condition that the water valve is of the continuously-adjusting type, the set value of the differential pressure switch is determined according to the maximum water valve opening value in the air-conditioning system, so that the water valve with the maximum water valve opening value can be ensured to be normally used, and the use requirement is met.
As an alternative embodiment, in case that the water valve type is a continuously adjusting water valve, the determining the set value of the temperature of the supplied water and the pressure signal according to the set value includes: acquiring average supply and return water temperature differences of a preset number of target position water valves; and determining a set value of water supply temperature and a pressure signal according to the average temperature difference of the supplied and returned water.
According to the embodiment of the invention, the pressure signal is determined according to the set value of the pressure difference switch, whether the pressure signal is sent out is determined according to the average supply and return water temperature difference of the water valve, the set value of the supply water temperature is adjusted according to the average supply and return water temperature difference of the water valve at the target position, and the stable adjustment of the pressure difference of the water system can be realized.
Alternatively, the predetermined number may be a fixed value set in advance, such as 5; the predetermined number may also be proportionally determined based on the number of water valves in the water system.
As an alternative embodiment, in the case that the water valve type is an on-off type water valve, determining the setting value of the pressure difference switch in the water system according to the demand information includes: determining the opening proportion of the water valve of which the opening time exceeds the preset time according to the opening time of the water valve of each tail end position in the air conditioning system in the preset time period; and determining the set value of the differential pressure switch according to the opening ratio of the water valve.
As an alternative embodiment, in the case that the water valve is an on-off type water valve, the determining the set value of the water supply temperature and the pressure signal according to the set value of the differential pressure switch comprises: acquiring the duration of a set value; the water supply temperature set point and the pressure signal are determined based on the duration.
According to the embodiment of the invention, the pressure signal is determined according to the set value of the pressure difference switch, and the set value of the water supply temperature is determined according to the duration of the set value, so that the stable adjustment of the pressure difference of the water system can be realized.
As an alternative embodiment, in the case that the water valve type is a mixed type water valve, the determining the setting value of the differential pressure switch in the water system according to the demand information includes: determining a set value of a differential pressure switch corresponding to a continuous adjustment type water valve in the mixed type water valve as a first set value; determining a set value of a pressure difference switch corresponding to the on-off type water valve in the mixed type water valve as a second set value; and determining the final set value of the mixed water valve according to the first set value and the second set value.
As an alternative embodiment, in the case that the water valve type is a hybrid water valve, the determining the set water temperature and the pressure signal according to the set value includes: setting the duration of a corresponding set value of a continuously-adjusted water valve in the mixed water valve as a first duration; setting the duration of a set value corresponding to the on-off type water valve in the mixed type water valve as a second duration; a supply water temperature set point and a pressure signal are determined based on the first duration and the second duration.
The invention also provides a preferred embodiment, the preferred embodiment provides a variable pressure difference optimization control method of the chilled water system based on the TR algorithm, the implementation of the method needs to be based on an intelligent building automatic control system, and the system has the functions of data acquisition and control of a heating, ventilating and air conditioning system.
According to the technical scheme provided by the invention, the corresponding control method can be matched according to different water valve types.
Fig. 2 is a schematic diagram of a method for calculating a set value of a differential pressure switch at the end of a continuously adjusting water valve and a control logic according to an embodiment of the present invention, as shown in fig. 2.
Step A1: and acquiring the air conditioner terminal data of the building heating and ventilation system. Acquiring water valve opening values, namely demand signals, of all AHU units from an intelligent building automatic control system, and acquiring water supply and return temperature of water pipes of the AHU units, wherein the water valve opening combined with the water supply and return temperature difference can indirectly reflect the demand values of the AHU units on cold and heat loads; all the parameters are input into an algorithm, and the set value of the pressure difference switch in the water system at the next moment can be calculated. The specific implementation mode is as follows:
1A) and at least one tail end water valve is kept to be close to full opening, so that the system resistance is reduced.
2A) And traversing all the AHU unit water valve opening degrees, screening the water valve opening degree value DMPR of the AHU with the maximum water valve opening degree, and feeding the water valve opening degree value DMPR as a demand signal back to the water pump controller.
3A) An initial pressure differential set point P0 is set and the DMPR is taken every 10 minutes.
4A) Determining the pressure difference P required at time j +1j+1I.e. to determine the set value of the differential pressure switch.
Alternatively, whether to control the differential pressure switch may be determined according to a section corresponding to a set value of the differential pressure switch.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the first section), it is necessary to perform the pressure-increasing control of the differential pressure switch.
First intervalComprises the following steps:
in the formula: pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; DMPRjThe maximum water valve opening degree at the current moment of all AHU units is percent; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the second section), it is necessary to perform the pressure-increasing control of the differential pressure switch.
The second interval is:
in the formula: pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; DMPRjThe maximum water valve opening degree at the current moment of all AHU units is percent; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the third section), the differential pressure switch does not need to be subjected to differential pressure control.
The third interval is: pj+1＝Pj∈[Pmin，Pmax]，87％≤DMPRj≤92％
Pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; DMPRjThe maximum water valve opening degree at the current moment of all AHU units is percent; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Step A2: and correcting the set value of the differential pressure switch. The calculation frequency of the method is once every 10 minutes, which may cause the set value of the pressure difference switch to change too fast, and the water flow to change too much in a short time, which causes the temperature difference between the inlet water and the outlet water of the water coil to be too large/too small, resulting in the phenomenon of low utilization rate of refrigerating capacity, and the refrigerating capacity needs to be corrected. And traversing the opening degrees of the water valves of all the AHU units, sequencing the opening degrees of the water valves according to a sequence from large to small, wherein the larger the opening degree is, the larger the demand is, the water supply and return temperature of the coil pipe corresponding to the first 5 units with the largest opening degree is selected, the respective water supply and return temperature difference is calculated, and the average value of the 5 temperature differences is obtained. And (4) establishing different correction algorithms according to the average value and three conditions of unchanged pressure increasing/reducing/pressure obtained by calculation in the step (1). The specific implementation mode is as follows:
1B) and acquiring the temperature difference between the supply water and the return water of the first 5 air-conditioning boxes with the largest requirement according to the opening DMPR of the water valve.
2B) Calculating the average temperature difference delta t of the supplied water and the returned waterpj，
In the formula: Δ tpjThe average value of the temperature difference of the supply water and the return water of the front 5 air-conditioning box coil pipes is DEG C; Δ t1～Δt5The temperature difference of supply and return water of the front 5 air-conditioning box coil pipes is DEG C.
Alternatively, when there is a boost signal, (i.e. in the case that the set value of the differential pressure switch is in the first interval, the pressure signal determined according to the set value of the differential pressure switch is the boost signal), the implementation manner is as follows:
Alternatively, when there is a pressure reduction signal (i.e., in the case where the set value of the differential pressure switch is in the second interval, the pressure signal determined according to the set value of the differential pressure switch is the pressure reduction signal), the implementation is as follows:
Alternatively, when the differential pressure is unchanged (i.e. in the case that the set value of the differential pressure switch is in the third interval, the pressure signal determined according to the set value of the differential pressure switch is a steady-voltage signal), the implementation manner is as follows:
It should be noted that if tj＝tminAnd D, when the duration time of the pressurization signal exceeds two calculation step lengths, the pressure is increased according to the calculation result of the step A1, and temperature difference judgment is not needed.
It should be noted that if tj＝tmaxAnd when the duration time of the pressure reduction signal exceeds two calculation step lengths, reducing the pressure according to the calculation result of the step A1 without temperature difference judgment.
Optionally, an adjustment of the step size is calculated. If the set value of the differential pressure switch is adjusted last time, the calculation step length is 10 minutes; if the set value of the water supply temperature is adjusted last time, the calculation step length is 15 minutes.
Fig. 3 is a schematic diagram of a method for calculating a set value and control logic of a differential pressure switch at the end of an on-off type water valve according to an embodiment of the present invention, as shown in fig. 3.
Step B1: and acquiring the air conditioner terminal data of the building heating and ventilation system. Acquiring on-off water valve switching states and duration of all devices such as fan coil pipes and the like from an intelligent building automatic control system as demand signals; all the parameters are input into an algorithm, and the set value of the pressure difference switch in the water system at the next moment can be calculated. The specific implementation mode is as follows:
1C) for each tail end, counting the proportion R of the total opening time in the past T time according to the on-off signal of the water valveopenAnd T is set to 10 minutes by default.
2C) If R isopen> 75%, sending a demand signal Ri。
3C) Summing all the demands ∑ RiCalculating the current RopenRatio R to the total number of all termini.
In the formula: r is the ratio of the tail end of the sending requirement to the total number of all tail ends; n is a radical ofterminalThe total number of the tail ends of all the on-off types; an initial pressure differential set point P0 is set and the demand ratio R is checked every T times.
4C) Pressure difference P required at time j +1j+1I.e. to determine the set value of the differential pressure switch.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the fourth section), it is necessary to perform the pressure-increasing control of the differential pressure switch.
The fourth interval is:
in the formula: pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; r is the ratio of the end of the transmission requirement to the total number of all ends,%; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the fifth section), the differential pressure switch needs to be subjected to pressure reduction control.
The fifth interval is:
in the formula: pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; r is the ratio of the end of the transmission requirement to the total number of all ends,%; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Alternatively, the pressure difference P required at time j +1j+1When the differential pressure switch (i.e., the set value of the differential pressure switch) is in the following section (e.g., the sixth section), the differential pressure switch does not need to be subjected to differential pressure control.
The sixth interval is: pj+1＝Pj∈[Pmin，Pmax]，75％≤R≤80％
In the formula: pj+1The pressure difference, Pa, required by the water system at the next moment; pjThe current set value of the differential pressure switch of the water system is Pa; r is the ratio of the end of the transmission requirement to the total number of all ends,%; pminThe minimum pressure difference, Pa, required for the water system; pmaxThe maximum pressure difference, Pa, required for the water system.
Step B2: and correcting the set value of the differential pressure switch. When the set value of the differential pressure switch calculated by the method is maintained at the upper limit value/the lower limit value, the adjustment of the differential pressure alone cannot match the end requirement, and the set value of the differential pressure switch needs to be corrected. And B1, acquiring the set temperature of the water chiller as a correction parameter, and correcting by combining the relationship between the set value of the differential pressure switch and the upper limit and the lower limit calculated in the step B1. The specific implementation mode is as follows:
if Pj+1＝PmaxIf the duration time exceeds 20 minutes, sending a water supply temperature reducing signal; t is tj+1＝tj-1∈[tmin，tmax]In the formula: t is tjSetting the temperature of the cold machine water supply at the current moment at DEG C; t is tj+1The temperature setting value of the water supply of the refrigerator at the next moment is DEG C; t is tminThe lower limit value of the temperature of the water supplied to the refrigerator is DEG C; t is tmaxUpper limit of water supply temperature of refrigerator，℃。
If Pj+1＝PminSending a water supply temperature increasing signal when the duration time exceeds 20 minutes; t is tj+1＝tj+1∈[tmin，tmax]In the formula: t is tjSetting the temperature of the cold machine water supply at the current moment at DEG C; t is tj+1The temperature setting value of the water supply of the refrigerator at the next moment is DEG C; t is tminThe lower limit value of the temperature of the water supplied to the refrigerator is DEG C; t is tmaxThe upper limit value of the water supply temperature of the refrigerator is DEG C.
Optionally, an adjustment of the step size is calculated. If the set value of the differential pressure switch is adjusted last time, the calculation step length is 10 minutes; if the set value of the water supply temperature is adjusted last time, the calculation step length is 15 minutes
As another alternative embodiment, the method for calculating the set value of the differential pressure switch at the tail end of the mixed type water valve comprises the following steps.
Step C1: and acquiring the air conditioner terminal data of the building heating and ventilation system. Acquiring on-off water valve switching states and duration of all equipment such as fan coil pipes and the like from an intelligent building automatic control system as demand signals, and acquiring continuous water valve opening values of all equipment such as an AHU unit and the like; according to the algorithm, the set values of the two differential pressure switches can be respectively calculated, and the final set value of the differential pressure switch is calculated by comparing the relationship between the set values of the two differential pressure switches.
1D) And the continuous adjustment type water valve and the on-off type water valve in the mixed water valve are respectively calculated by the rules and send pressurization and depressurization instructions.
2D) Comparing the pressure increasing and reducing requirements of two water valve pipelines, namely the set value P of the pressure difference switch required at the moment of j +1j+1I.e. to determine the set value of the differential pressure switch.
Optionally, if pressurization is required at the same time (i.e. the pressure signal corresponding to the continuously-adjustable water valve and the pressure signal corresponding to the on-off water valve are both pressurization signals), Pj+1＝max(Pa，Pb)∈[Pmin，Pmax]In the formula: paSetting value, P, of differential pressure switch calculated for continuous type water valvebOf differential pressure switches calculated for on-off type valvesAnd (5) setting the value.
Optionally, if pressure reduction is required at the same time (i.e. the pressure signal corresponding to the continuous adjustment type water valve and the pressure signal corresponding to the on-off type water valve are both pressure reduction signals), Pj+1＝min(Pa，Pb)∈[Pmin，PmaxIn the formula: paSetting value, P, of differential pressure switch calculated for continuous type water valvebAnd calculating the set value of the pressure difference switch for the on-off type water valve.
Optionally, if one path needs pressurization and the other path needs decompression, the pressurization is taken as the standard; for example, if the pressure signal corresponding to the continuous adjustment type water valve is a pressurization signal, and the pressure signal corresponding to the on-off type water valve is a pressure reduction signal, the pressure signal corresponding to the final mixed type water valve is an increase signal; and the pressure signal corresponding to the continuous adjustment type water valve is a pressure reduction signal, the pressure signal corresponding to the on-off type water valve is a pressure increase signal, and finally the pressure signal corresponding to the mixed type water valve is an increase signal.
Step C2: in this example, the set value of the differential pressure switch is corrected. When the set value of the differential pressure switch calculated by the method is maintained at the upper limit value/the lower limit value, the set value of the differential pressure switch is required to be corrected, which indicates that the set value of the differential pressure switch cannot be matched with the end requirement only by adjusting the set value of the differential pressure switch. The set temperature of the water chiller is obtained as a correction parameter, and the relationship between the set value of the differential pressure switch and the upper limit and the lower limit calculated in the step C1 corresponds to different correction algorithms. The specific implementation mode is as follows:
if Pa＝Pmax&Pb＝PmaxContinuing for 20 minutes, and sending a water supply temperature reducing signal; t is tj+1＝tj-1∈[tmin，tmax]Wherein P isaSetting value, P, of differential pressure switch calculated for continuous type water valvebSetting value, t, of differential pressure switch calculated for on-off type water valvejSetting the temperature of the cold machine water supply at the current moment at DEG C; t is tj+1The temperature setting value of the water supply of the refrigerator at the next moment is DEG C; t is tminThe lower limit value of the temperature of the water supplied to the refrigerator is DEG C; t is tmaxThe upper limit value of the water supply temperature of the refrigerator is DEG C.
If Pa＝Pmin&Pb＝PminContinuing for 20 minutes, and sending a water supply temperature increasing signal; t is tj+1＝tj+1∈[tmin，tmax]Wherein P isaSetting value, P, of differential pressure switch calculated for continuous type water valvebSetting value, t, of differential pressure switch calculated for on-off type water valvejSetting the temperature of the cold machine water supply at the current moment at DEG C; t is tj+1The temperature setting value of the water supply of the refrigerator at the next moment is DEG C; t is tminThe lower limit value of the temperature of the water supplied to the refrigerator is DEG C; t is tmaxThe upper limit value of the water supply temperature of the refrigerator is DEG C.
Optionally, an adjustment of the step size is calculated. If the set value of the differential pressure switch is adjusted last time, the calculation step length is 10 minutes; the last time the feed water temperature set value was adjusted, the calculation step length was 15 minutes.
The invention adopts TR algorithm to continuously adjust the pressure difference set point according to the terminal demand signal, the adjusting speed is strengthened along with the increase of the demand quantity, the pressure difference set point is corrected by adjusting the water supply temperature of the cold station in order to avoid the too high pressure difference adjusting frequency, and the pressure difference set point is ensured to change stably. The method has the advantages that the algorithm is simple, the application is strong, the calculated set value of the differential pressure switch can meet the air conditioning comfort of most of tail ends, and meanwhile, the energy consumption for operation can be reduced.
According to an embodiment of the present invention, there is also provided an embodiment of a water system control device, where the water system control device may be used to execute the water system control method in the embodiment of the present invention, and the water system control method in the embodiment of the present invention may be executed in the water system control device.
Fig. 4 is a schematic view of a control apparatus of a water system applied to an air conditioning system according to an embodiment of the present invention, as shown in fig. 4, the apparatus may include:
a first obtaining unit 41, configured to determine a water valve type of each target position water valve in the air conditioning system; the second obtaining unit 43 is configured to obtain the requirement information of the air conditioner terminal according to the type of the water valve; a first determination unit 45 for determining a set value of a differential pressure switch in the water system according to the demand information; a second determination unit 47 for determining the water supply temperature set point and the pressure signal according to the set point.
It should be noted that the first obtaining unit 41 in this embodiment may be configured to execute step S102 in this embodiment, the second obtaining unit 43 in this embodiment may be configured to execute step S104 in this embodiment, the first determining unit 45 in this embodiment may be configured to execute step S106 in this embodiment, and the second determining unit 47 in this embodiment may be configured to execute step S108 in this embodiment. The modules are the same as the corresponding steps in the realized examples and application scenarios, but are not limited to the disclosure of the above embodiments.
In the embodiment of the invention, the water valve type of each target position water valve in the air-conditioning system is obtained; acquiring demand information of the air conditioner terminal according to the type of the water valve; determining a set value of a differential pressure switch in the water system according to the demand information; the water supply temperature set value and the pressure signal are determined according to the set value, the pressure difference can be adjusted in real time according to the terminal demand signal, the correction of the pressure difference control is realized by adjusting the water supply temperature, and the stable change of the pressure difference is ensured, so that the technical effect of stably controlling the pressure difference of the water system is realized, and the technical problem of unstable pressure difference control of the water system is solved.
As an alternative embodiment, the water valve type includes: the water valve comprises a continuous adjusting type water valve, an on-off type water valve and a mixed type water valve, wherein the mixed type water valve is a combination of the continuous adjusting type water valve and the on-off type water valve; the demand information includes: and the opening degree value of the water valve corresponding to the continuously adjustable water valve and the opening duration of the water valve corresponding to the on-off water valve are continuously adjusted.
As an alternative embodiment, in the case where the water valve type is a continuously adjusting water valve, the first determination unit includes: the first determining subunit is used for determining the maximum value of the water valve opening values according to the water valve opening value of each target position water valve in the air-conditioning system; and the second determining subunit is used for determining the set value of the differential pressure switch according to the maximum value in the opening value of the water valve.
As an alternative embodiment, in the case where the water valve type is a continuously adjusting water valve, the second determination unit includes: the first acquisition subunit is used for acquiring the average supply and return water temperature difference of a preset number of target position water valves; and the third determining subunit is used for determining a set water supply temperature value and a pressure signal according to the average water supply and return temperature difference.
As an alternative embodiment, in the case where the water valve type is an on-off type water valve, the first determination unit includes: the fourth determining subunit is used for determining the water valve opening proportion of the water valve of which the water valve opening time exceeds the preset time according to the water valve opening time of each tail end position water valve in the air conditioning system in the preset time period; and the fifth determining subunit is used for determining the set value of the differential pressure switch according to the opening ratio of the water valve.
As an alternative embodiment, in the case where the water valve type is an on-off type water valve, the second determination unit includes: the second acquisition subunit is used for acquiring the duration of the set value; and a sixth determining submodule for determining the water supply temperature set value and the pressure signal according to the duration.
As an alternative embodiment, in the case that the water valve type is a hybrid type water valve, the first determination unit includes: the seventh determining subunit is used for determining that the set value of the differential pressure switch corresponding to the continuous adjustment type water valve in the mixed type water valve is the first set value; the eighth determining subunit is used for determining that the set value of the differential pressure switch corresponding to the on-off type water valve in the mixed type water valve is the second set value; and the ninth determining subunit is used for determining the final set value of the mixed water valve according to the first set value and the second set value.
As an alternative embodiment, in the case that the water valve type is a hybrid type water valve, the second determination unit includes: the tenth determining subunit is used for determining the duration of the set value corresponding to the continuously-adjusted water valve in the mixed water valve as the first duration; the eleventh determining subunit is used for determining the duration of the set value corresponding to the on-off type water valve in the mixed type water valve as the second duration; and a twelfth determining sub-unit for determining the water supply temperature set value and the pressure signal according to the first duration and the second duration.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for controlling a water system, the water system being used in an air conditioning system, the method comprising:
acquiring the water valve type of each target position water valve in the air conditioning system;
acquiring demand information of the air conditioner tail end according to the water valve type;
determining a set value of a pressure difference switch in the water system according to the demand information;
and determining a water supply temperature set value and a pressure signal according to the set value.
2. The method of claim 1,
the water valve types include: the water valve comprises a continuous adjusting type water valve, an on-off type water valve and a mixed type water valve, wherein the mixed type water valve is a combination of the continuous adjusting type water valve and the on-off type water valve;
the demand information includes: and the opening degree value of the water valve corresponding to the continuously-adjusted water valve and the opening duration of the water valve corresponding to the on-off water valve are obtained.
3. The method of claim 2, wherein determining a setting of a differential pressure switch in the water system based on the demand information in the event the water valve type is the continuously regulating water valve comprises:
determining the maximum value of the water valve opening values according to the water valve opening value of each target position water valve in the air-conditioning system;
and determining a set value of the differential pressure switch according to the maximum value in the opening value of the water valve.
4. The method of claim 2, wherein determining a supply water temperature setpoint and a pressure signal based on the setpoint, in the case where the water valve type is the continuously adjusting water valve type, comprises:
acquiring average supply and return water temperature differences of a preset number of target position water valves;
and determining the set water supply temperature value and the pressure signal according to the average water supply and return temperature difference.
5. The method of claim 2, wherein determining a setting of a pressure differential switch in the water system based on the demand information in the event the water valve type is the on-off water valve comprises:
determining a water valve opening proportion that the water valve opening duration exceeds a preset duration according to the water valve opening duration of each tail end position water valve in the air conditioning system in a preset time period;
and determining a set value of the differential pressure switch according to the opening ratio of the water valve.
6. The method of claim 2, wherein determining a supply water temperature set point and a pressure signal based on the set point of the differential pressure switch in the case where the water valve type is the on-off water valve comprises:
acquiring the duration of the set value;
determining the water supply temperature set point and the pressure signal based on the duration.
7. The method of claim 2, wherein determining a setting of a differential pressure switch in the water system based on the demand information in the case where the water valve type is the hybrid water valve comprises:
determining a set value of a differential pressure switch corresponding to the continuous adjustment type water valve in the mixed type water valve as a first set value;
determining a set value of a differential pressure switch corresponding to the on-off type water valve in the mixed type water valve as a second set value;
and determining the final set value of the mixed water valve according to the first set value and the second set value.
8. The method of claim 2, wherein determining a supply water temperature setpoint and the pressure signal based on the setpoint, in the case where the water valve type is the hybrid water valve, comprises:
setting the duration of a corresponding set value of the continuously-adjusted water valve in the mixed water valve as a first duration;
setting the duration of a set value corresponding to the on-off type water valve in the mixed type water valve as a second duration;
determining the supply water temperature setpoint and the pressure signal based on the first duration and the second duration.
9. A water system control device for use in an air conditioning system, the device comprising:
the first acquisition unit is used for determining the water valve type of each target position water valve in the air conditioning system;
the second acquisition unit is used for acquiring the requirement information of the air conditioner tail end according to the water valve type;
the first determining unit is used for determining a set value of a pressure difference switch in the water system according to the demand information;
and the second determining unit is used for determining a water supply temperature set value and a pressure signal according to the set value.
10. A computer-readable storage medium, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method of controlling a water system of any one of claims 1 to 8.
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Application publication date: 20210903 |