CN114063677A - Water temperature adjusting time optimization method for water chiller - Google Patents
Water temperature adjusting time optimization method for water chiller Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 241
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005457 optimization Methods 0.000 title claims abstract description 10
- 230000001419 dependent effect Effects 0.000 claims abstract description 24
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims abstract description 4
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- 238000012544 monitoring process Methods 0.000 claims abstract description 4
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- 238000012360 testing method Methods 0.000 description 5
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- 239000003507 refrigerant Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- 239000008235 industrial water Substances 0.000 description 1
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a method for optimizing water temperature adjusting time of a water chiller, belonging to the technical field of water chillers and temperature control; the optimization method sequentially executes the following steps: step a, monitoring key parameters under a multi-time working environment; step b, determining independent variables and dependent variables; c, selecting a key parameter median; step d, normalizing the key parameters; e, calculating the absolute deviation between the independent variable and the dependent variable; step f, calculating a dependent variable influence coefficient; step g, judging the influence of the dependent variable; according to the optimization method for the water temperature adjusting time of the water chiller, the water temperature adjusting time is used as a dependent variable, factors influencing the water temperature adjusting time are used as independent variables, an algorithm capable of representing the influence degree of each variable on the dependent variable is designed, the water temperature adjusting time of the water chiller is reduced, the adjusting efficiency is improved, and a guidance direction for most effectively adjusting the independent variables is provided.
Description
Technical Field
The invention discloses a method for optimizing water temperature adjusting time of a water chiller, and belongs to the technical field of water chillers and temperature control.
Background
The industrial water chiller is widely applied to the fields of various industrial freezing processes such as chemical industry, electronics, pharmacy, food processing and the like which need to use chilled water. The water chiller may be classified into an ice-cold type, a water-cooled type and an air-cooled type according to its operation principle. Wherein, the water-cooled water chiller has mature technology, low manufacturing cost and the most extensive application.
The schematic flow chart of the working principle of the water-cooled water chiller is shown in fig. 1. The shell-and-tube evaporator is used for enabling water and a refrigerant to exchange heat, the refrigerant system absorbs heat load in water, and after water is cooled to generate cold water, heat is brought to the fin-type condenser through the action of the compressor and is dissipated to outside air through the cooling fan, and the air cooling process is completed.
The working efficiency of the water chiller is directly related to the water temperature adjusting time, the water temperature adjusting time is directly related to key parameters such as water volume, and the like, and the research on the relationship between the water temperature adjusting speed and the key parameters is beneficial to improving the working efficiency of the water chiller, however, related research is not found.
Disclosure of Invention
The invention discloses a method for optimizing water temperature adjusting time of a water cooler, which aims to explore the relationship between the water temperature adjusting time of the water cooler and other key parameters so as to change the key parameters and improve the working efficiency of the water cooler.
The purpose of the invention is realized as follows:
a water temperature adjusting time optimization method for a water chiller comprises the following steps:
step a, under the working environment of n times, monitoring the following key parameters:
water temperature regulating time tiWherein i is 1,2, …, n;
volume of water NiWherein i is 1,2, …, n;
difference value delta T between current water temperature and target water temperature1iWherein i is 1,2, …, n;
difference value delta T between current water temperature and ambient temperature2iWherein i is 1,2, …, n;
fan speed niWherein i is 1,2, …, n;
step b, determining independent variables and dependent variables:
in the adjusting process, the expected water temperature adjusting time is shortest, and the water temperature adjusting time is related to the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed, so that the water temperature adjusting time is a dependent variable, and the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed are independent variables;
c, selecting a key parameter median:
the water temperature is adjusted for time tiVolume of water NiDifference value delta T between current water temperature and target water temperature1iDifference value delta T between current water temperature and ambient temperature2iAnd fan speed niArranging from small to large or from large to small, if n is an odd number, selecting a middle numerical value, and if n is an even number, selecting the middle two numerical values and taking an average value;
the selected key parameter median is respectively as follows:
median t of water temperature regulation timem；
Median water volume Nm；
Median delta T of difference value between current water temperature and target water temperature1m；
Median delta T of difference value between current water temperature and ambient temperature2m；
Fan speed median nm；
Step d, normalizing the key parameters
Normalized water temperature regulation time
Wherein i is 1,2, …, n;
normalized water volume
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the target water temperature
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the ambient temperature
Wherein i is 1,2, …, n;
normalized fan speed
Wherein i is 1,2, …, n;
step e, calculating the absolute deviation between the independent variable and the dependent variable:
calculating the deviation of the normalized water temperature adjustment time and the normalized water volume: ERROR1＝|t'i-N'i|
Calculating the normalized water temperature adjusting time and the deviation of the normalized current water temperature and the target water temperature difference value: ERROR2＝|t'i-ΔT'1i|
Calculating the normalized water temperature adjusting time and the deviation of the difference value between the normalized current water temperature and the ambient temperature: ERROR3＝|t'i-ΔT'2i|
Calculating the deviation between the normalized water temperature adjusting time and the normalized fan rotating speed: ERROR4＝|t'i-n'i|
Step f, calculating a dependent variable influence coefficient:
wherein k is 1,2,3, 4;
step g, judging the influence of the dependent variable:
if α is1The maximum value shows that the water volume is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the water volume so as to shorten the water temperature adjusting time;
if α is2The maximum difference value indicates that the difference value between the current water temperature and the target water temperature is the most main factor influencing the water temperature adjusting time, and the main factor and the secondary factor are balanced by changing the water volume, the ambient temperature or the rotating speed of the fan so as to shorten the water temperature adjusting time;
if α is3Maximum, when explainingThe difference value between the front water temperature and the ambient temperature is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the ambient temperature so as to shorten the water temperature adjusting time;
if α is4The maximum value shows that the rotating speed of the fan is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the rotating speed of the fan so as to shorten the water temperature adjusting time.
The water temperature adjusting time optimization method for the water chiller further comprises the following steps:
step h, comparing the change conditions of the water temperature adjusting time before and after the key parameters are changed under the condition that the secondary factors are the same, if:
the water temperature adjusting time is shortened, and the optimization is successful;
the water temperature adjusting time is prolonged, and the key parameters are adjusted in the opposite direction.
Has the advantages that:
the invention discloses a method for optimizing water temperature adjusting time of a water chiller, which takes the water temperature adjusting time as a dependent variable and factors influencing the water temperature adjusting time as independent variables, designs an algorithm capable of representing the influence degree of the respective variables on the dependent variables, and further provides a guidance direction for most effectively adjusting the independent variables for reducing the water temperature adjusting time of the water chiller, improving the adjusting efficiency.
Drawings
Fig. 1 is a schematic flow chart of the working principle of a water-cooled water chiller.
Fig. 2 is a first flowchart of a water temperature adjusting time optimizing method for a water chiller according to the present invention.
Fig. 3 is a flow chart of a water temperature adjusting time optimizing method of a water chiller according to a second embodiment of the present invention.
Fig. 4 is a photograph of a front panel used to test a water chiller.
Fig. 5 is a photograph of a rear panel used to test a water chiller.
Fig. 6 is a photograph used to test the top panel of a water chiller.
Fig. 7 is a photograph used to test a chiller controller.
Fig. 8 is a screenshot of the method of the present invention running on a Matlab program.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed description of the invention
A flow chart of a method for optimizing water temperature adjustment time of a water chiller according to the present embodiment is shown in fig. 2, and includes the following steps:
step a, under the working environment of n times, monitoring the following key parameters:
water temperature regulating time tiWherein i is 1,2, …, n;
volume of water NiWherein i is 1,2, …, n;
difference value delta T between current water temperature and target water temperature1iWherein i is 1,2, …, n;
difference value delta T between current water temperature and ambient temperature2iWherein i is 1,2, …, n;
fan speed niWherein i is 1,2, …, n;
step b, determining independent variables and dependent variables:
in the adjusting process, the expected water temperature adjusting time is shortest, and the water temperature adjusting time is related to the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed, so that the water temperature adjusting time is a dependent variable, and the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed are independent variables;
c, selecting a key parameter median:
the water temperature is adjusted for time tiVolume of water NiDifference value delta T between current water temperature and target water temperature1iDifference value delta T between current water temperature and ambient temperature2iAnd fan speed niArranging from small to large or from large to small, if n is an odd number, selecting a middle numerical value, and if n is an even number, selecting the middle two numerical values and taking an average value;
the selected key parameter median is respectively as follows:
median t of water temperature regulation timem；
Median water volume Nm；
Median delta T of difference value between current water temperature and target water temperature1m；
Median delta T of difference value between current water temperature and ambient temperature2m；
Fan speed median nm；
Step d, normalizing the key parameters
Normalized water temperature regulation time
Wherein i is 1,2, …, n;
normalized water volume
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the target water temperature
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the ambient temperature
Wherein i is 1,2, …, n;
normalized fan speed
Wherein i is 1,2, …, n;
step e, calculating the absolute deviation between the independent variable and the dependent variable:
calculating the deviation of the normalized water temperature adjustment time and the normalized water volume: ERROR1＝|t'i-N'i|
Calculating the normalized water temperature adjusting time and the deviation of the normalized current water temperature and the target water temperature difference value: ERROR2＝|t'i-ΔT'1i|
Calculating the deviation of the normalized water temperature adjustment time and the normalized difference between the current water temperature and the ambient temperatureDifference: ERROR3＝|t'i-ΔT'2i|
Calculating the deviation between the normalized water temperature adjusting time and the normalized fan rotating speed: ERROR4＝|t'i-n'i|
Step f, calculating a dependent variable influence coefficient:
wherein k is 1,2,3, 4;
step g, judging the influence of the dependent variable:
if α is1The maximum value shows that the water volume is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the water volume so as to shorten the water temperature adjusting time;
if α is2The maximum difference value indicates that the difference value between the current water temperature and the target water temperature is the most main factor influencing the water temperature adjusting time, and the main factor and the secondary factor are balanced by changing the water volume, the ambient temperature or the rotating speed of the fan so as to shorten the water temperature adjusting time;
if α is3The maximum difference value indicates that the difference value between the current water temperature and the ambient temperature is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the ambient temperature so as to shorten the water temperature adjusting time;
if α is4The maximum value shows that the rotating speed of the fan is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the rotating speed of the fan so as to shorten the water temperature adjusting time.
Detailed description of the invention
A flow chart of the method for optimizing water temperature adjustment time of a water chiller according to the present embodiment is shown in fig. 3, and on the basis of the first embodiment, the method further includes the following steps:
step h, comparing the change conditions of the water temperature adjusting time before and after the key parameters are changed under the condition that the secondary factors are the same, if:
the water temperature adjusting time is shortened, and the optimization is successful;
the water temperature adjusting time is prolonged, and the key parameters are adjusted in the opposite direction.
Detailed description of the invention
In the method for optimizing the water temperature adjusting time of the water chiller according to the embodiment, an FTD-WTC001 water chiller developed by the company is used as a test object, and a front panel, a rear panel, an upper panel and a controller of the water chiller are respectively shown in fig. 4 to 7.
Under different working conditions, key parameters were monitored as shown in the table:
table 1 key parameter record table
Based on the key parameters in table 1, Matlab 2014 was used to simulate the method of the present invention, and the procedure was as follows:
the program operation results are shown in fig. 8, from which the following results can be seen:
α1＝0.8102
α2＝0.8002
α3＝0.5981
α4＝0.6610
from the above results, it can be seen that the water volume is the most critical factor affecting the adjustment time, followed by the difference between the current water temperature and the target water temperature, followed by the fan speed, with the least impact between the current water temperature and the ambient temperature. Under the guiding principle, on the basis of the first group of data, the water volume is changed to be adjusted from 30L to 33L, and under the conditions that the difference value between the current water temperature and the target water temperature is still 20 ℃, the difference value between the current water temperature and the ambient temperature is still 20 ℃, and the rotating speed of the fan is still 300r/s, the adjustment time is monitored to be reduced from 300s to 283s, so that the adjustment method is proved to be effective.
Claims (2)
1. A water temperature adjusting time optimization method for a water chiller is characterized by comprising the following steps:
step a, under the working environment of n times, monitoring the following key parameters:
water temperature regulating time tiWherein i is 1,2, …, n;
volume of water NiWherein i is 1,2, …, n;
difference value delta T between current water temperature and target water temperature1iWherein i is 1,2, …, n;
difference value delta T between current water temperature and ambient temperature2iWherein i is 1,2, …, n;
fan speed niWherein i is 1,2, …, n;
step b, determining independent variables and dependent variables:
in the adjusting process, the expected water temperature adjusting time is shortest, and the water temperature adjusting time is related to the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed, so that the water temperature adjusting time is a dependent variable, and the water volume, the difference value between the current water temperature and the target water temperature, the difference value between the current water temperature and the environment temperature and the fan rotating speed are independent variables;
c, selecting a key parameter median:
the water temperature is adjusted for time tiVolume of water NiDifference value delta T between current water temperature and target water temperature1iDifference value delta T between current water temperature and ambient temperature2iAnd fan speed niArranging from small to large or from large to small, if n is an odd number, selecting a middle numerical value, and if n is an even number, selecting the middle two numerical values and taking an average value;
the selected key parameter median is respectively as follows:
median t of water temperature regulation timem；
Median water volume Nm；
Median delta T of difference value between current water temperature and target water temperature1m；
Median delta T of difference value between current water temperature and ambient temperature2m；
Fan speed median nm；
Step d, normalizing the key parameters
Normalized water temperature regulation time
Wherein i is 1,2, …, n;
normalized water volume
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the target water temperature
Wherein i is 1,2, …, n;
normalizing the difference between the current water temperature and the ambient temperature
Wherein i is 1,2, …, n;
normalized fan speed
Wherein i is 1,2, …, n;
step e, calculating the absolute deviation between the independent variable and the dependent variable:
calculating the deviation of the normalized water temperature adjustment time and the normalized water volume: ERROR1＝|t'i-N'i|
Calculating the normalized water temperature adjusting time and the deviation of the normalized current water temperature and the target water temperature difference value: ERROR2＝|t'i-ΔT'1i|
Calculating the normalized water temperature adjusting time and the deviation of the difference value between the normalized current water temperature and the ambient temperature: ERROR3＝|t'i-ΔT'2i|
Calculating the deviation between the normalized water temperature adjusting time and the normalized fan rotating speed: ERROR4＝|t'i-n'i|
Step f, calculating a dependent variable influence coefficient:
wherein k is 1,2,3, 4;
step g, judging the influence of the dependent variable:
if α is1The maximum value shows that the water volume is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the water volume so as to shorten the water temperature adjusting time;
if α is2The maximum difference value indicates that the difference value between the current water temperature and the target water temperature is the most main factor influencing the water temperature adjusting time, and the main factor and the secondary factor are balanced by changing the water volume, the ambient temperature or the rotating speed of the fan so as to shorten the water temperature adjusting time;
if α is3The maximum difference value indicates that the difference value between the current water temperature and the ambient temperature is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the ambient temperature so as to shorten the water temperature adjusting time;
if α is4The maximum value shows that the rotating speed of the fan is the most main factor influencing the water temperature adjusting time, and the main factor is strengthened by changing the rotating speed of the fan so as to shorten the water temperature adjusting time.
2. The method for optimizing the water temperature adjusting time of the water chiller according to claim 1, further comprising the steps of:
h, adjusting key parameters according to the influence of the dependent variable
Under the condition that the secondary factors are the same, comparing the change conditions of the water temperature adjusting time before and after the key parameters are changed, and if:
the water temperature adjusting time is shortened, and the optimization is successful;
the water temperature adjusting time is prolonged, and the key parameters are adjusted in the opposite direction.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017429A (en) * | 2012-07-02 | 2013-04-03 | 中国科学院沈阳自动化研究所 | High-precision fast control method for variable-frequency industrial water chiller |
| CN205721423U (en) * | 2016-05-27 | 2016-11-23 | 华南理工大学 | A kind of Water in Water Tank temperature control device |
| CN109186018A (en) * | 2018-08-23 | 2019-01-11 | 重庆美的通用制冷设备有限公司 | Water cooler and the method, apparatus for controlling water cooler |
| CN112856842A (en) * | 2021-01-25 | 2021-05-28 | 珠海格力电器股份有限公司 | Control method of water chiller and water chiller |
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- 2021-11-19 CN CN202111375643.0A patent/CN114063677B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017429A (en) * | 2012-07-02 | 2013-04-03 | 中国科学院沈阳自动化研究所 | High-precision fast control method for variable-frequency industrial water chiller |
| CN205721423U (en) * | 2016-05-27 | 2016-11-23 | 华南理工大学 | A kind of Water in Water Tank temperature control device |
| CN109186018A (en) * | 2018-08-23 | 2019-01-11 | 重庆美的通用制冷设备有限公司 | Water cooler and the method, apparatus for controlling water cooler |
| CN112856842A (en) * | 2021-01-25 | 2021-05-28 | 珠海格力电器股份有限公司 | Control method of water chiller and water chiller |
Non-Patent Citations (2)
| Title |
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| 江帆 等: "变温热源小型热电冷水机结构设计与性能分析", 《工程热物理学报》 * |
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Address after: 215000 Suzhou Industrial Park, Suzhou City, Jiangsu Province, No. 200 Xingpu Road, 5 # 101, 102, 201, 202 Patentee after: Suzhou Fatedi Technology Co.,Ltd. Country or region after: China Address before: 215000 Suzhou Industrial Park, Suzhou City, Jiangsu Province, No. 200 Xingpu Road, 5 # 101, 102, 201, 202 Patentee before: FTDEVICE TECHNOLOGY (SUZHOU) CO.,LTD. Country or region before: China |