CN107655151A - A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing - Google Patents
A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing Download PDFInfo
- Publication number
- CN107655151A CN107655151A CN201710937092.XA CN201710937092A CN107655151A CN 107655151 A CN107655151 A CN 107655151A CN 201710937092 A CN201710937092 A CN 201710937092A CN 107655151 A CN107655151 A CN 107655151A
- Authority
- CN
- China
- Prior art keywords
- msub
- mrow
- mfrac
- main
- munderover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Feedback Control In General (AREA)
Abstract
The present invention relates to a kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing, including：Least favorable end and loop are determined according to air conditioning water system, and establish simplified model：For every section of main, by the length L of this section of main separated by branch pipeiWith internal diameter DiCharacteristic parameter as this section of main；According to the end quantity that each branch road includes and the total end quantity of system, estimate that each branch pipe flow accounts for the ratio of system total flow；Measure air conditioning water outlet real-time flow rate Vn；3) it is assumed that in the case of the flow identical of each end, the time T that chilled water flows to least favorable end from air-conditioner set outlet is calculated.
Description
Technical field
The present invention relates to a kind of air-conditioner water system feedforward control time computational methods, belong to air conditioner system energy saving optimization neck
Domain.
Background technology
With the continuous development of economic society, China's building energy consumption is absolute to the relative value of total energy consumption and building energy consumption
Value all suffers from the pressure of sustainable growth, and heating ventilation air-conditioning system constitutes about half of building energy consumption or so.Air-conditioning system in building
System energy-conservation has become the emphasis of energy-saving field.
Air-conditioning system is a large dead time, time-varying, nonlinear system, traditional PI D feedback control technologies, it is impossible to is realized empty
Adjust the Dynamic Matching of load and building load.Feed forward control method based on load prediction is just suggested, to solve the above problems.
In numerous feed forward control methods and theory, in order to overcome the time lag of air-conditioning system all can advance system Slack time
T applies control action, but does not propose computational methods that are effective, simplifying to T numerical value in numerous feed forward control methods.And
Time T accuracy can largely influence the effect of feedforward control.
In robot control system(RCS), the delay of regulating system is the delay sum of controller lag and controlled plant.When regulation pair
When starting change as the adjustment parameter at middle installation measuring cell, generally require and just start through post regulator after a while accordingly
Action, be referred to as the delay of adjuster this period of process；When adjuster starts corresponding actions, generally requires by one section
Between controlled plant expected change just occurs, be referred to as the delay of controlled plant this period of process.
The input parameter adjusted in load prediction feedforward control is the load of prediction, therefore controller lag is not present.
In the system of chilled water outlet temperature alternating temperature regulation, the delay of controlled plant flows what is brought mainly due to chilled water, therefore
It is believed that the delay of flowing is exactly system loading predictive feed forward control time delay T.
The content of the invention
The defects of existing to solve the above-mentioned feedforward control time, the present invention provide a kind of air-conditioner water system feedforward control time
Computational methods.The air-conditioning system real time delay time is calculated by flow hydraulic according to actual air conditioning water system in the present invention
T, pre-set time T apply the feedforward control based on load prediction, to ensure that end load matches with prediction load after the T moment,
Reduce air conditioning energy consumption.Technical scheme is as follows：
A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing, it comprises the following steps：
1) least favorable end and loop are determined according to air conditioning water system, and establishes simplified model in following manner：
For every section of main, by the length L of this section of main separated by branch pipeiWith internal diameter DiSpy as this section of main
Levy parameter；According to the end quantity that each branch road includes and the total end quantity of system, estimate that each branch pipe flow accounts for system total flow
Ratio；
2) air conditioning water outlet real-time flow rate V is measuredn；
3) it is assumed that in the case of the flow identical of each end, calculate chilled water and flow to least favorable from air-conditioner set outlet
The time T of end；
Preferably, if simplified model shares n branch road, the computational methods described in step 3) comprise the following steps：
The first step, each section of main flow velocity V is calculated according to equation belowi
Wherein xiIt is the ratio that branch pipe i flows account for total flow, DiIt is main i internal diameter, DnIt is the interior of chilled water outlet main
Footpath, VnIt is chilled water outlet real-time flow rate；
Second step, each main time delay T is calculated according to equation belowi
Wherein LiIt is the length of each section of main；
3rd step calculates total delay time T according to equation below
Air-conditioning system real time delay time T computational methods provided by the invention are from control action is produced to least favorable end
The time delay for reaching dbjective state, can so ensure that whole system is in dbjective state.
Brief description of the drawings
Fig. 1 is the air-conditioner water system feedforward control time computational methods flow chart transmitted based on flowing.
Fig. 2 is air conditioning water index circuit simplified model schematic diagram.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings to embodiment party of the present invention
Formula is described in further detail：
Fig. 1 show the air-conditioner water system feedforward control time computational methods flow chart that the present invention is transmitted based on flowing, bag
Include following steps：
1) foundation of air conditioning water system simplified model, as shown in Figure 2.Least favorable end is determined according to HVAC drawing respectively
End and loop, the length L of each section of main separated by branch pipeiWith internal diameter DiAnd the end quantity m that each branch road includesiWith
The total end quantity M of system；And it is assumed that in the case of each end flow identical, calculate the ratio that branch pipe flow accounts for system total flow
Example xi.Formula is as follows：
In air conditioning water system simplified model, each section of main length LiFollowing simplification is done：LiIt is by the pipeline section bend pipe
Part is converted into the length of pipe section after straight tube.
In air conditioning water system simplified model, each section of main internal diameter DiCan be according to this section of main public affairs on HVAC drawing
Diameter is claimed to be determined with material inquiry related specifications.
The L of determinationi, DiAnd xiSystematic parameter as time delay computation model.
2) in air conditioning water outlet main installation flowmeter, measurement air conditioning water outlet real-time flow rate Vn；Each
Before air-conditioning feedforward control is implemented, by VnNumerical value be sent to time delay computation model as input parameter, for calculating this
The time delay of control.
Chilled water outlet flow velocity must be real-time measurement values, because time delay can be influenceed by real-time flow rate.
3) determine that chilled water flows to the time T of least favorable end from air-conditioner set outlet according to time delay computation model,
Step is as follows：
1. simplified model as shown in Figure 2 shares n branch road, main flow is exported according to each section of main and air conditioning water
Each section of main flow velocity V is calculated with the ratio of internal diameteri.Formula is as follows：
Wherein xiIt is the ratio that each branch pipe flow accounts for total flow, DiIt is the internal diameter of each section of main, DnIt is that chilled water outlet is done
The internal diameter of pipe, VnIt is chilled water outlet real-time flow rate.
2. each main time delay T is calculated according to the ratio between each section of main pipe range and flow velocityi.Formula is as follows：
Wherein LiIt is the length of each section of main.
3. each section of main time delay sum is exactly that the time delay of least favorable end is exported to from air conditioning water, then always
Time delay T calculation formula is as follows：
The output parameter total delay time T of time delay computation model can carrying as air-conditioner water system feedforward controller
Preceding actuation time.Feedforward control algorithm can select suitable feedforward control input parameter according to time T, and (that is predicted after such as T moment is negative
Lotus data), to ensure after the T moment whole system all in the dbjective state after regulation, can make the load that end provides with it is pre-
The load of survey is quantitatively equal, synchronous in time.
Claims (2)
1. a kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing, it comprises the following steps：
1) least favorable end and loop are determined according to air conditioning water system, and establishes simplified model in following manner：
For every section of main, by the length L of this section of main separated by branch pipeiWith internal diameter DiFeature ginseng as this section of main
Number；According to the end quantity that each branch road includes and the total end quantity of system, estimate that each branch pipe flow accounts for the ratio of system total flow
Example.
2) air conditioning water outlet real-time flow rate V is measuredn。
3) it is assumed that in the case of the flow identical of each end, calculate chilled water and flow to least favorable end from air-conditioner set outlet
Time T.
2. the air-conditioner water system feedforward control time computational methods according to claim 1 transmitted based on flowing, its feature
It is, if simplified model shares n branch road, the computational methods described in step 3) comprise the following steps：
The first step, each section of main flow velocity V is calculated according to equation belowi
<mrow>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>i</mi>
</munderover>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>D</mi>
<mi>n</mi>
</msub>
<msub>
<mi>D</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>&CenterDot;</mo>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
</mrow>
Wherein xiIt is the ratio that branch pipe i flows account for total flow, DiIt is main i internal diameter, DnIt is the internal diameter of chilled water outlet main, Vn
It is chilled water outlet real-time flow rate；
Second step, each main time delay T is calculated according to equation belowi
<mrow>
<msub>
<mi>T</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>L</mi>
<mi>i</mi>
</msub>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<msub>
<mi>L</mi>
<mi>i</mi>
</msub>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>i</mi>
</munderover>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>D</mi>
<mi>n</mi>
</msub>
<msub>
<mi>D</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>&CenterDot;</mo>
<msub>
<mi>V</mi>
<mi>n</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein LiIt is the length of each section of main；
3rd step calculates total delay time T according to equation below
<mrow>
<mi>T</mi>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>T</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<mfrac>
<msub>
<mi>L</mi>
<mi>i</mi>
</msub>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>i</mi>
</munderover>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>D</mi>
<mi>n</mi>
</msub>
<msub>
<mi>D</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>&CenterDot;</mo>
<msub>
<mi>V</mi>
<mi>n</mi>
</msub>
</mrow>
</mfrac>
<mo>.</mo>
</mrow>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937092.XA CN107655151A (en) | 2017-10-10 | 2017-10-10 | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937092.XA CN107655151A (en) | 2017-10-10 | 2017-10-10 | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107655151A true CN107655151A (en) | 2018-02-02 |
Family
ID=61117588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710937092.XA Pending CN107655151A (en) | 2017-10-10 | 2017-10-10 | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107655151A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1892132A (en) * | 2005-07-07 | 2007-01-10 | 乐金电子(天津)电器有限公司 | Air-conditioner and control method |
| CN101406940A (en) * | 2008-11-14 | 2009-04-15 | 重庆大学 | On-line control method of continuous casting blank temperature based on memory recognition mode |
| CN101737899A (en) * | 2009-12-14 | 2010-06-16 | 浙江大学 | Wireless sensor network-based central air-conditioning control system and method |
| CN106647289A (en) * | 2017-03-06 | 2017-05-10 | 武汉大学 | Feedforward control method for opening and closing time of open channel water dispatching gate |
| JP2017089967A (en) * | 2015-11-10 | 2017-05-25 | アズビル株式会社 | Air conditioning control support device and method |
| CN107052061A (en) * | 2017-06-16 | 2017-08-18 | 安徽工程大学 | A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation |
-
2017
- 2017-10-10 CN CN201710937092.XA patent/CN107655151A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1892132A (en) * | 2005-07-07 | 2007-01-10 | 乐金电子(天津)电器有限公司 | Air-conditioner and control method |
| CN101406940A (en) * | 2008-11-14 | 2009-04-15 | 重庆大学 | On-line control method of continuous casting blank temperature based on memory recognition mode |
| CN101737899A (en) * | 2009-12-14 | 2010-06-16 | 浙江大学 | Wireless sensor network-based central air-conditioning control system and method |
| JP2017089967A (en) * | 2015-11-10 | 2017-05-25 | アズビル株式会社 | Air conditioning control support device and method |
| CN106647289A (en) * | 2017-03-06 | 2017-05-10 | 武汉大学 | Feedforward control method for opening and closing time of open channel water dispatching gate |
| CN107052061A (en) * | 2017-06-16 | 2017-08-18 | 安徽工程大学 | A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation |
Non-Patent Citations (1)
| Title |
|---|
| 刘志渊，于航等: ""考虑管网延迟特性的分布式能源站实时出力计算"", 《暖通空调》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108916986B (en) | Information physical fusion secondary pipe network variable flow hydraulic balance regulation and control method and system | |
| CN112128841A (en) | Whole-network balance adjusting method based on load prediction and room temperature feedback correction | |
| CN107065515B (en) | Plate heat exchanger model construction method based on fuzzy PID control | |
| CN104101105B (en) | The composite control method of a kind of heating crude oil furnace temperature and device thereof | |
| CN106958855A (en) | The hydraulically balanced model predictive control method of heating system and system | |
| CN108105844B (en) | Intelligent heat exchange station control method based on indoor and outdoor temperature combined compensation | |
| CN107023966B (en) | Method for optimizing set value of outlet water temperature of cooling water of air conditioner of subway station | |
| CN111475913A (en) | Operation optimization method and system for steam power system | |
| CN106369834A (en) | Directly-heated type heat pump system constant-temperature flow control method based on neural network | |
| CN104500979A (en) | Online diagnosis and elimination system for steam flowing retention section in heating pipe network and working method | |
| CN203396032U (en) | Room temperature control device based on fuzzy self-adaption PID (proportion integration differentiation) | |
| CN104315683A (en) | Fuzzy PID (proportion integration differentiation) -based water-cooled air conditioner regulation and control method | |
| CN104075584B (en) | A kind of waste heat of flue gas of heating furnace recovered temperature controls System and method for | |
| CN100998995A (en) | Temperature control system of milling uluminium/aluminium alloy coiled material and control method | |
| CN108755840A (en) | A kind of equal balance system of industrial flow and its matching process | |
| CN108845609A (en) | A kind of gas loading system and method | |
| CN208205047U (en) | The hardware structure of feedforward neural network control system suitable for flue gas waste heat recovery | |
| CN114110940A (en) | Intelligent electric regulating valve adjusting method and system for air-conditioning water system | |
| CN107655151A (en) | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing | |
| CN109140677B (en) | Intelligent building energy-saving control system and control method thereof | |
| CN112100778A (en) | Scheduling method and system of comprehensive energy system | |
| CN102889671A (en) | Room temperature control device and room temperature control method capable of self-correcting Smith estimation control | |
| EP2715213B1 (en) | Gas heating system for gas pressure reducing systems and method for obtaining said heating effect | |
| CN205678768U (en) | Portable thermal substation courtyard heating pipe network hydraulic equilibrium adjusting means | |
| CN101737554A (en) | Control method of linear temperature control valve and valve implementing same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180202 |