CN113567166A - Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group - Google Patents

Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group Download PDF

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Publication number
CN113567166A
CN113567166A CN202110847843.5A CN202110847843A CN113567166A CN 113567166 A CN113567166 A CN 113567166A CN 202110847843 A CN202110847843 A CN 202110847843A CN 113567166 A CN113567166 A CN 113567166A
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air cooler
tested
power
adjustment
variable frequency
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刘冬桂
江旭
蒋敦军
周京武
康秀峰
熊军
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Hunan Credo Energy Technology Co ltd
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Hunan Credo Energy Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/002—Thermal testing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

The invention discloses a dynamic energy-saving evaluation method and an evaluation system of an evaporative air cooler group, wherein the method comprises the following steps: obtaining a function and a derivative function relation of the power and the operating frequency of the variable frequency fan, and obtaining a function and a derivative function relation of the power and the spray water flow of the spray pump; determining the allowable highest temperature of the circulating cooling water when the circulating cooling water flows out of the air cooler group; selecting any air cooler as a test object to be adjusted, and determining the operation configuration after the adjustment is finished and the power saving power of the air cooler before the adjustment; and determining the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group. The dynamic energy-saving evaluation method and the evaluation system for the evaporative air cooler group provided by the invention have the advantages of scientific, reasonable, simple, rapid, safe and stable mode and accurate and reliable evaluation result.

Description

Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group
Technical Field
The invention belongs to the field of evaporative air coolers, and particularly relates to a dynamic energy-saving evaluation method and an evaluation system for an evaporative air cooler group.
Background
An evaporative air cooler, also known as a closed cooling tower, a closed cooling tower or a closed cooling tower, is characterized in that a coil-shaped tubular heat exchanger is arranged in the tower, and the cooling effect is ensured through the heat exchange of circulating air, spray water and circulating cooling water. In the working process of the evaporative air cooler, circulating cooling water flows inside the coil, and air and spray water flow outside the coil, so that the circulating cooling water belongs to closed circulation, the water quality of the circulating cooling water can be guaranteed not to be polluted, and long-term, stable and efficient operation of cooled equipment can be guaranteed. Due to the advantage, the evaporative air cooler is widely applied to industries such as steel, metallurgy, chemical industry, electric power, air conditioning systems and the like.
Due to the limited processing capacity of evaporative air coolers, a large number of evaporative air coolers are commonly used in parallel in the industrial field to process a larger flow of circulating cooling water. However, the single evaporative air cooler has a certain independence, and the rotating speed of a variable frequency fan of the single evaporative air cooler can be adjusted through frequency conversion to change the circulating air quantity or the opening degree of a valve of the spray water pipe is changed to adjust the flow of the spray water. The working process of the evaporative air cooler needs to consume a large amount of energy, and the energy consumption of the evaporative air cooler mainly comes from a variable frequency fan for circulating air and a spray pump for conveying spray water. Considering that the working environment and the working condition of the evaporative air cooler are complex, the refrigeration performance of the evaporative air cooler is influenced by various factors such as the inflow flow rate of circulating cooling water, the inflow temperature of the circulating cooling water, the quality of the circulating cooling water, the atmospheric environment temperature, the atmospheric environment humidity, the flow rate of spray water, the ventilation air volume, the scaling of a coil pipe of the air cooler and the like in a process link, and accurate theoretical prediction is difficult to perform.
The controllable operation parameters of the evaporative air cooler are generally limited to the air volume of the variable frequency fan and the flow of spray water, and the operation parameters of the evaporative air cooler can be dynamically adjusted to realize energy conservation on the premise of meeting the water temperature requirement of circulating cooling water flowing out of the evaporative air cooler. However, because the evaporative air cooler has a lot of influence factors on the refrigerating capacity of the circulating cooling water, it is difficult to establish a reliable theoretical model to guide the energy-saving optimization of the evaporative air cooler; on the other hand, the operation parameters relate to the two aspects of the air quantity of the variable frequency fan and the flow of the spray water, so that the stable and effective energy conservation is difficult to realize by adopting an automatic feedback control means.
Therefore, how to break through the limitation of the prior known technology, on the premise of not affecting the normal operation of the evaporative air cooler unit as much as possible, by means of tests and data analysis, the dynamic energy-saving evaluation of the evaporative air cooler unit is realized, and a corresponding evaluation system is developed to better guide the energy-saving operation of the evaporative air cooler, which is undoubtedly a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides a dynamic energy-saving evaluation method and an evaluation system for an evaporative air cooler group, which are stable, reliable, simple, convenient, rapid, objective, scientific and controllable in cost.
The technical scheme adopted by the invention is as follows: a dynamic energy-saving evaluation method for an evaporative air cooler group is characterized in that the evaporative air cooler group is formed by connecting a plurality of air coolers in parallel, and comprises the following steps:
step (1), obtaining a unitary cubic function relation and a derivative function relation of the variable frequency fan power and the operating frequency of the air cooler, and obtaining a unitary cubic function relation and a derivative function relation of the spray pump power and the spray water flow of the air cooler:
the method comprises the following steps of looking up equipment data of the air cooler or testing the air cooler, and applying a least square method to fit data to obtain a unitary cubic function relation of the power and the operating frequency of the variable-frequency fan:
Pf(F)＝afF3+bfF2+cfF+df；
in the formula, Pf(F) Is the power of the variable frequency fan, F is the operating frequency of the variable frequency fan, af、bf、cfAnd dfThe coefficient of a cubic term, the coefficient of a quadratic term, the coefficient of a primary term and a constant term of the unitary cubic function relation of the power and the operating frequency of the variable frequency fan are respectively;
and (3) carrying out derivation on the unitary cubic function relation of the power and the operating frequency of the variable frequency fan to obtain a derivative function relation of the power and the operating frequency of the variable frequency fan:
P′f(F)＝3afF2+2bfF+cf；
of formula (II)'f(F) Is the power derivative of the variable frequency fan;
fitting data to obtain a unitary cubic function relation between the spray pump power and the spray water flow of the air cooler:
Pw(W)＝awW3+bwW2+cwW+dw；
in the formula: pw(W) is the power of the spray pump, W is the spray water flow, aw、bw、cwAnd dwCubic coefficient, quadratic coefficient, primary coefficient and constant term of the unitary cubic function relation of the spray pump power and the spray water flow rate;
and (3) carrying out derivation on the unitary cubic function relation of the spray pump power and the spray water flow to obtain a derivative function relation of the spray pump power and the spray water flow:
P′w(W)＝3awW2+2bwW+cw；
in the formula: p'w(W) is the power derivative of the spray pump;
step (2) determining the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
Step (3), selecting any air cooler in the evaporative air cooler group as a test object to be adjusted, and determining the operation configuration after the adjustment is finished and the power saving power of the air cooler relative to the power saving power before the adjustment:
selecting any one air cooler in the evaporative air cooler group as a test object, determining the combination of two parameters, namely the operating frequency of the variable frequency fan of the air cooler and the spray water flow of the spray pump when the energy consumption of the tested air cooler is the lowest on the premise of meeting the process requirements through the adjustment of the operating frequency of the variable frequency fan of the tested air cooler and the spray water flow, finishing the adjustment, and calculating the power saving power of the tested air cooler relative to the power saving power before the adjustment after the adjustment is finished;
step (4), determining the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the power saving power of the evaporative air cooler group:
and (4) outputting the two parameter combinations of the running frequency of the variable frequency fan and the flow of spray water after the adjustment of the tested air cooler determined in the step (3) is finished as the running parameter combination of each air cooler in the evaporative air cooler group, and multiplying the power saving power obtained in the step (3) after the adjustment of the tested air cooler is finished relative to the power saving power before the adjustment by the number of the air coolers in the evaporative air cooler group as the power saving power of the evaporative air cooler group.
In the above dynamic energy-saving evaluation method for the evaporative air cooler group, the step (3) is specifically operated as follows:
step (3.1), selecting one air cooler in the evaporative air cooler group as a test object, acquiring the circulating water outlet temperature T of the tested air cooler, the operating frequency F of the variable frequency fan and the spraying water flow W of the spraying pump in real time, and determining the single-step adjustment quantity delta F of the operating frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity delta W of the spraying water flow in the single adjustment process;
step (3.2), recording the circulating water outlet temperature T of the tested air cooler before adjustmentcFrequency conversion fan operating frequency FcAnd the flow rate W of spray water of the spray pumpcAnd judging the circulating water outlet temperature T of the tested air cooler before adjustmentcWhether the maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler group determined in the step (2) is higher than the allowable maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler groupm: if the circulating water outlet temperature T of the tested air cooler is adjustedcThe maximum allowable temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler group determined in the step (2) is highermInterrupting the step and quitting the regulation of the step (3); if the circulating water outlet temperature T of the tested air cooler is adjustedcNot higher than the allowable maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler group determined in the step (2)mEntering the step (3.3);
step (3.3), respectively adjusting the variable frequency fan and the spray pump of the tested air cooler according to the following five single-step adjusting modes, and respectively obtaining a lead function relation of the power and the operating frequency of the variable frequency fan and a lead function relation of the power and the spray water flow of the spray pump under the five single-step adjusting modes based on the step (1) to obtain a reduction delta P value of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler:
the first single-step regulation mode: the frequency conversion fan operating frequency reduces delta F and spray water flow reduces delta W, waits for 1 to 10 minutes so that the operation of the air cooler to be tested is stable, and the frequency conversion fan and the decline amount of the sum of the operating power of the spray pump of the corresponding air cooler to be tested are:
ΔP＝ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
the second single-step regulation mode: the spraying water flow is reduced by delta W while the running frequency of the variable frequency fan is kept unchanged, the waiting time is 1 to 10 minutes so that the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the running power of the spraying pump of the tested air cooler is as follows:
ΔP＝ΔW(3awWc 2+2bwWc+cw)；
the third single-step regulation mode: the running frequency of the variable frequency fan is reduced by delta F while the spraying water flow is kept unchanged, the operation of the tested air cooler is stable after waiting for 1 to 10 minutes, and the descending amount of the sum of the running powers of the corresponding tested air cooler fan and the spraying pump is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)；
a fourth single step conditioning regime: spraying water flow reduces delta W and frequency conversion fan operating frequency increases delta F, waits for 1 to 10 minutes so that the air cooler operation of being tried is stable, and the decline quantity of the sum of the corresponding air cooler fan of being tried and the spray pump operating power is:
ΔP＝-ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
a fifth single-step adjustment mode: the running frequency of the variable frequency fan is reduced by delta F and the flow of spray water is increased by delta W, the waiting time is 1 to 10 minutes so that the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the spray pump of the tested air cooler is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)-ΔW(3awWc 2+2bwWc+cw)；
in the formula: delta P is the descending amount of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler and the spray pump after single-step adjustment, and is approximate to the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler before single-step adjustment minus the sum of the operating powers of the variable frequency fan and the spray pump after single-step adjustment; delta F and delta W are respectively the single-step adjustment quantity of the running frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity of the flow of spraying water of the spraying pump in the single-step adjustment process; fcAnd WcRespectively adjusting the running frequency of a variable frequency fan of the air cooler to be tested and the flow of spraying water of a spraying pump;
step (3.4), eliminating the single step regulation mode that the value of the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler corresponding to the five single step regulation modes in the step (3.3) is less than or equal to 0, taking the rest single step regulation modes as alternative single step regulation modes, and respectively recording the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler as a 1 st alternative single step regulation mode to an Nth alternative single step regulation mode according to the sequence from large to small, wherein: n is the number of the types of alternative single step regulation modes and is 3 or 4;
and (3.5) adjusting the air cooler to be tested according to the 1 st alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and the step (3.6) is carried out;
step (3.6), if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupTmAdjusting the tested air cooler according to the opposite direction corresponding to the 1 st alternative single-step adjustment mode, and entering the step (3.7); if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.5);
and (3.7) adjusting the air cooler to be tested according to the 2 nd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and the step (3.8) is carried out;
step (3.8), if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 2 nd alternative single-step adjustment mode, and entering the step (3.9); if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.7);
and (3.9) adjusting the air cooler to be tested according to the 3 rd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and enter the step (3.10);
step (3.10), if the step (3.9) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 3 rd alternative single-step adjustment mode, and entering the step (3.11); if the step (3.9) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.9);
step (3.11), and alternative single step regulation mode determined in step (3.4)If the number N of the types of (2) is 3, directly entering the step (3.13); if the type number N of the alternative single-step adjusting modes determined in the step (3.4) is 4, adjusting the air cooler to be tested according to the 4 th alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and enter the step (3.12);
step (3.12), if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 4 th alternative single-step adjustment mode, and entering the step (3.13); if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.11);
and (3.13) finishing the adjustment, and recording the running frequency F of the variable frequency fan of the tested air cooler after the adjustment is finishedeAnd the flow rate W of spray water of the spray pumpeAnd calculating the power-saving power after the adjustment is finished relative to the power-saving power before the adjustment as the combination of the operation parameters when the energy consumption of the tested air cooler is lowest on the premise of meeting the process requirements:
Figure RE-GDA0003252785960000081
in the formula: delta PeThe power is saved after the regulation is finished relative to the power before the regulation; fe and We are respectively the running frequency of a variable frequency fan of the tested air cooler and the spraying water flow of the spraying pump after the regulation is finished.
In the dynamic energy-saving evaluation method for the evaporative air cooler group, the single-step adjustment quantity delta F of the operating frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity delta W of the spraying water flow of the spraying pump are fixed values in the single adjustment process, the single-step adjustment quantity delta F of the operating frequency of the variable frequency fan of the tested air cooler is 1% -5% of the maximum allowable value of the operating frequency of the variable frequency fan of the tested air cooler, and the single-step adjustment quantity delta F of the spraying water flow of the spraying pump of the tested air cooler is 1% -5% of the maximum allowable value of the spraying water flow of the tested air cooler.
In the above dynamic energy-saving evaluation method for the evaporative air cooler group, the single adjustment process does not cause the operation frequency of the variable frequency fan of the tested air cooler or the spray water flow rate of the spray pump to exceed the respective maximum allowable values of the two, if any single adjustment causes the operation frequency of the variable frequency fan of the tested air cooler or the spray water flow rate of the spray pump to exceed the respective maximum allowable values of the two, the adjustment test is terminated, the operation frequency of the variable frequency fan and the spray water flow rate parameter combination at which the adjustment is terminated are used as the operation parameter combination at the lowest energy consumption of the tested air cooler on the premise of meeting the process requirements, and the power saving power before the relative adjustment after the adjustment is terminated is calculated.
In the above dynamic energy-saving evaluation method for the evaporative air cooler group, the tested air cooler is adjusted according to the ith alternative single-step adjustment mode, where i is 1, 2, 3, or 4, and the operation frequency reduction Δ F of the variable frequency fan or/and the operation frequency reduction Δ W of the spray water flow in the ith alternative single-step adjustment mode are changed into the operation frequency increase Δ F of the variable frequency fan or/and the operation frequency increase Δ W of the spray water flow.
A dynamic energy-saving evaluation system of an evaporative air cooler group for realizing the dynamic energy-saving evaluation method of the evaporative air cooler group is characterized by comprising a data input module, a data acquisition module, a data storage module, an adjusting operation module and a data display module:
the data input module, the data acquisition module, the adjusting operation module and the data display module are electrically connected with the data storage module;
the data input module is used for inputting the number of air coolers of the evaporative air cooler group, the unitary cubic function relation of the power of the variable frequency fan of the air cooler and the operating frequency of the variable frequency fan and the guide function relation thereof, the unitary cubic function relation of the power of the spray pump and the spray water flow and the guide function relation thereof, and the allowable highest temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
The data acquisition module is used for acquiring the circulating water outlet temperature T, the operating frequency F of the variable frequency fan and the spray water flow W of the tested air cooler in real time;
the data storage module is used for storing the data provided by the data input module, the data acquisition module and the adjusting operation module and providing the final result obtained by the adjusting operation module to the data display module;
the data display module is used for displaying the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group;
and the adjusting operation module reads the data of the data input module and the data storage module, performs dynamic energy-saving evaluation on the evaporative air cooler group, and finally obtains the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group.
Compared with the prior art, the invention has the beneficial effects that:
1. aiming at the characteristic that the operating environment and the working condition of the evaporative air cooler group are complex and changeable, any air cooler in the evaporative air cooler group is selected, dynamic adjustment is carried out on the air cooler to determine the combination of the operating frequency of the variable frequency fan and the flow parameter of the spray water when the energy consumption of the air cooler is optimal, the influence on the whole evaporative air cooler group is small, and the normal work of the evaporative air cooler group is hardly interfered, so that the dynamic energy-saving evaluation method disclosed by the invention is safe and stable and has wide applicability.
2. The dynamic adjustment test is carried out on the tested air cooler, the running frequency of the variable frequency fan and the spray water flow parameter combination of the spray pump when the energy consumption is optimal under the condition of meeting the circulating cooling water temperature requirement when flowing out of the air cooler are determined, the adjustment test is carried out step by step, the running frequency of the variable frequency fan and the adjustment quantity of the spray water flow of the spray pump at each step are fixed values, the single-step adjustment process is preferentially adjusted according to the mode that the total energy consumption is reduced fastest, and the adjustment test is immediately adjusted in the opposite direction once the circulating cooling water temperature exceeds the allowable value when flowing out of the air cooler due to one-step adjustment.
3. The method obtains the functional relation between the power and the operating frequency of the variable-frequency fan and the functional relation between the power and the spray water flow of the spray pump through fitting, and derives the two functional relations, so that the drop values of the power of the variable-frequency fan and the power of the spray pump corresponding to each single-step adjusting mode can be accurately obtained very conveniently and rapidly based on the derived functions in the dynamic adjusting test process of the tested air cooler, and the method has the advantages of being scientific and reasonable, high in accuracy and simple in calculation.
Drawings
Fig. 1 is a flow chart of a dynamic energy-saving evaluation method of an evaporative air cooler group according to the present invention.
Fig. 2 is a flow chart of each substep of step (3) in the dynamic energy-saving evaluation method of the evaporative air cooler group according to the present invention;
fig. 3 is a block diagram of a dynamic energy-saving evaluation system of the evaporative air cooler group according to the present invention.
Fig. 4 is a schematic diagram of the composition of an evaporative air cooler in an embodiment of the present invention, wherein: the device comprises a shell 1, a spray pump 2, a spray valve 3, a spray water pipe 4, a variable frequency fan 5, a spray head 6 and a pipe bundle 7.
FIG. 5 is a curve of the variation of the power of the variable frequency fan with the operation variable frequency in the embodiment of the present invention. FIG. 6 is a graph of the change in power of the spray water pump with spray water flow in an embodiment of the present invention.
FIG. 7 is a graph of the variation of spray water flow rate of the spray water pump with the frequency of operation in an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a dynamic energy-saving evaluation method and system for an evaporative air cooler group is applied to the evaporative air cooler group, and the evaporative air cooler group is formed by connecting a plurality of air coolers in parallel. As shown in fig. 4, the air cooler includes a housing 1, a tube bundle 7, a spray header 6, a spray header 4, a variable frequency fan 5, a spray valve 3 and a spray pump 2, the spray pump 2 is located outside the housing 1, and the spray header 6, the tube bundle 7 and the variable frequency fan 5 are located inside the housing 1. The outlet of the spray pump 2 is connected with a spray head 6 through a spray water pipe 4, and a spray valve 3 is arranged on the spray water pipe 4. The spray header 6 is positioned above the tube bundle 7, and the variable frequency fan 5 is positioned above the spray header 6.
The method comprises the following steps:
step (1), obtaining a unitary cubic function relation and a derivative function relation of the variable frequency fan power and the operating frequency of the air cooler, and obtaining a unitary cubic function relation and a derivative function relation of the spray pump power and the spray water flow of the air cooler:
the method comprises the following steps of looking up equipment data of the air cooler or testing the air cooler, and applying a least square method to fit data to obtain a unitary cubic function relation of the power and the operating frequency of the variable-frequency fan:
Pf(F)＝afF3+bfF2+cfF+df；
in the formula, Pf(F) Is the power of the variable frequency fan, F is the operating frequency of the variable frequency fan, af、bf、cfAnd dfThe coefficient of a cubic term, the coefficient of a quadratic term, the coefficient of a primary term and a constant term of the unitary cubic function relation of the power and the operating frequency of the variable frequency fan are respectively;
and (3) carrying out derivation on the unitary cubic function relation of the power and the operating frequency of the variable frequency fan to obtain a derivative function relation of the power and the operating frequency of the variable frequency fan:
P′f(F)＝3afF2+2bfF+cf；
of formula (II)'f(F) Is the power derivative of the variable frequency fan;
fitting data to obtain a unitary cubic function relation between the spray pump power and the spray water flow of the air cooler:
Pw(W)＝awW3+bwW2+cwW+dw；
in the formula: pw(W) is the power of the spray pump, W is the spray water flow, aw、bw、cwAnd dwOf spray pump power and spray water flow rate respectivelyCubic coefficient, quadratic coefficient, first order coefficient and constant term of the unitary cubic function relational expression;
and (3) carrying out derivation on the unitary cubic function relation of the spray pump power and the spray water flow to obtain a derivative function relation of the spray pump power and the spray water flow:
P′w(W)＝3awW2+2bwW+cw；
in the formula: p'w(W) is the power derivative of the spray pump;
step (2) determining the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
And (3) selecting one air cooler in the evaporative air cooler group as a test object to be adjusted, and determining the operation configuration after the adjustment is finished and the power saving power of the air cooler relative to the power saving power before the adjustment:
the specific operation is as follows:
step (3.1), selecting one air cooler in the evaporative air cooler group as a test object, acquiring the circulating water outlet temperature T of the tested air cooler, the operating frequency F of the variable frequency fan and the spraying water flow W of the spraying pump in real time, and determining the single-step adjustment quantity delta F of the operating frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity delta W of the spraying water flow in the single adjustment process;
step (3.2), recording the circulating water outlet temperature T of the tested air cooler before adjustmentcFrequency conversion fan operating frequency FcAnd the flow rate W of spray water of the spray pumpcAnd judging the circulating water outlet temperature T of the tested air cooler before adjustmentcWhether the maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler group determined in the step (2) is higher than the allowable maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler groupm: if the circulating water outlet temperature T of the tested air cooler is adjustedcThe maximum allowable temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler group determined in the step (2) is highermInterrupting the step and quitting the regulation of the step (3); if the circulating water outlet temperature T of the tested air cooler is adjustedcNot higher than the allowable maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler group determined in the step (2)mEntering the step(3.3)；
Step (3.3), respectively adjusting the variable frequency fan and the spray pump of the tested air cooler according to the following five single-step adjusting modes, and calculating the reduction delta P value of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler based on the derivative function relation of the power and the operating frequency of the variable frequency fan and the derivative function relation of the power and the spray water flow of the spray pump in the five single-step adjusting modes respectively calculated in the step (1):
the first single-step regulation mode: the frequency conversion fan operating frequency reduces delta F and spray water flow reduces delta W, waits for 1 to 10 minutes so that the operation of the air cooler to be tested is stable, and the frequency conversion fan and the decline amount of the sum of the operating power of the spray pump of the corresponding air cooler to be tested are:
ΔP＝ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
the second single-step regulation mode: the spraying water flow is reduced by delta W while the running frequency of the variable frequency fan is kept unchanged, the waiting time is 1 to 10 minutes so that the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the running power of the spraying pump of the tested air cooler is as follows:
ΔP＝ΔW(3awWc 2+2bwWc+cw)；
the third single-step regulation mode: the running frequency of the variable frequency fan is reduced by delta F while the spraying water flow is kept unchanged, the operation of the tested air cooler is stable after waiting for 1 to 10 minutes, and the descending amount of the sum of the running power of the variable frequency fan and the spraying pump of the corresponding tested air cooler is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)；
a fourth single step conditioning regime: spraying water flow, reducing the flow by delta W, increasing the running frequency of the variable frequency fan by delta F, waiting for 1 to 10 minutes to ensure that the tested air cooler runs stably, wherein the corresponding descending amount of the sum of the running powers of the variable frequency fan and the spraying pump of the tested air cooler is as follows:
ΔP＝-ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
a fifth single-step adjustment mode: the running frequency of the variable frequency fan is reduced by delta F and the flow of spray water is increased by delta W, the waiting time is 1 to 10 minutes so that the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the spray pump of the tested air cooler is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)-ΔW(3awWc 2+2bwWc+cw)；
in the formula: delta P is the descending amount of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler and the spray pump after single-step adjustment, and is approximate to the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler before single-step adjustment minus the sum of the operating powers of the variable frequency fan and the spray pump after single-step adjustment; delta F and delta W are respectively the single-step adjustment quantity of the running frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity of the flow of spraying water of the spraying pump in the single-step adjustment process; fcAnd WcRespectively adjusting the running frequency of a variable frequency fan of the air cooler to be tested and the flow of spraying water of a spraying pump;
step (3.4), eliminating the single step regulation mode that the value of the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler corresponding to the five single step regulation modes in the step (3.3) is less than or equal to 0, taking the rest single step regulation modes as alternative single step regulation modes, and respectively recording the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler as a 1 st alternative single step regulation mode to an Nth alternative single step regulation mode according to the sequence from large to small, wherein: n is the number of the types of alternative single step regulation modes and is 3 or 4;
and (3.5) adjusting the air cooler to be tested according to the 1 st alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe magnitude relation between them, and enter the step(3.6)；
Step (3.6), if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 1 st alternative single-step adjustment mode, and entering the step (3.7); if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.5);
and (3.7) adjusting the air cooler to be tested according to the 2 nd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and the step (3.8) is carried out;
step (3.8), if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 2 nd alternative single-step adjustment mode, and entering the step (3.9); if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.7);
and (3.9) adjusting the air cooler to be tested according to the 3 rd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and enter the step (3.10);
step (3.10), if the step (3.9) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 3 rd alternative single-step adjustment mode, and entering the step (3.11); if the step (3.9) judges that the temperature of the circulating water outlet of the air cooler to be tested is adjustedT is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.9);
step (3.11), if the type number N of the alternative single step regulation modes determined in the step (3.4) is 3, directly entering the step (3.13); if the type number N of the alternative single-step adjusting modes determined in the step (3.4) is 4, adjusting the air cooler to be tested according to the 4 th alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and enter the step (3.12);
step (3.12), if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 4 th alternative single-step adjustment mode, and entering the step (3.13); if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.11);
and (3.13) finishing the adjustment, and recording the running frequency F of the variable frequency fan of the tested air cooler after the adjustment is finishedeAnd the flow rate W of spray water of the spray pumpeAnd calculating the power-saving power after the adjustment is finished relative to the power-saving power before the adjustment as the combination of the operation parameters when the energy consumption of the tested air cooler is lowest on the premise of meeting the process requirements:
Figure RE-GDA0003252785960000161
in the formula: delta PeThe power is saved after the regulation is finished relative to the power before the regulation; fe and We are respectively the running frequency of a variable frequency fan of the tested air cooler and the spraying water flow of the spraying pump after the regulation is finished.
In the single adjustment process, the single-step adjustment quantity delta F of the running frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity delta W of the spraying water flow of the spraying pump are fixed values, the single-step adjustment quantity delta F of the running frequency of the variable frequency fan of the tested air cooler is 1% -5% of the maximum allowable value of the running frequency of the variable frequency fan of the tested air cooler, and the single-step adjustment quantity delta F of the spraying water flow of the spraying pump of the tested air cooler is 1% -5% of the maximum allowable value of the spraying water flow of the tested air cooler.
And if any single adjustment causes the operating frequency of the variable frequency fan of the tested air cooler or the spraying water flow of the spraying pump to exceed the respective maximum allowable values, terminating the adjustment test, taking the operating frequency of the variable frequency fan and the spraying water flow parameter combination when the adjustment is terminated as the operating parameter combination when the energy consumption of the tested air cooler is the lowest on the premise of meeting the process requirements, and calculating the electricity-saving power after the adjustment is finished relative to the electricity-saving power before the adjustment.
And (3) adjusting the tested air cooler according to an ith alternative single-step adjustment mode, wherein i is 1, 2, 3 or 4, and the operation frequency reduction delta F of the variable frequency fan or/and the flow reduction delta W of the spray water in the ith alternative single-step adjustment mode is changed into the operation frequency increase delta F of the variable frequency fan or/and the flow increase delta W of the spray water.
Step (4), determining the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the power saving power of the evaporative air cooler group:
and (4) outputting the two parameter combinations of the running frequency of the variable frequency fan and the flow of spray water after the adjustment of the tested air cooler determined in the step (3) is finished as the running parameter combination of each air cooler in the evaporative air cooler group, and multiplying the power saving power obtained in the step (3) after the adjustment of the tested air cooler is finished relative to the power saving power before the adjustment by the number of the air coolers in the evaporative air cooler group as the power saving power of the evaporative air cooler group.
As shown in fig. 3, a dynamic energy-saving evaluation system for an evaporative air cooler group for implementing the above dynamic energy-saving evaluation method for the evaporative air cooler group comprises a data input module, a data acquisition module, a data storage module, an adjustment operation module and a data display module:
the data input module, the data acquisition module, the adjusting operation module and the data display module are electrically connected with the data storage module;
the data input module is used for inputting the number of air coolers of the evaporative air cooler group, the unitary cubic function relation and the guide function relation of the variable frequency fan power of the air coolers and the operating frequency of the variable frequency fan, the unitary cubic function relation and the guide function relation of the spray pump power and the spray water flow, and the allowable highest temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
The data acquisition module is used for acquiring the circulating water outlet temperature T, the operating frequency F of the variable frequency fan and the spray water flow W of the tested air cooler in real time;
the data storage module is used for storing the data provided by the data input module, the data acquisition module and the adjusting operation module and providing the final result obtained by the adjusting operation module to the data display module;
the data display module is used for displaying the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group;
and the adjusting operation module reads the data of the data input module and the data storage module, performs dynamic energy-saving evaluation on the evaporative air cooler group, and finally obtains the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group.

Claims (6)

1. A dynamic energy-saving evaluation method for an evaporative air cooler group is characterized in that the evaporative air cooler group is formed by connecting a plurality of air coolers in parallel, and comprises the following steps:
step (1), obtaining a unitary cubic function relation and a derivative function relation of the variable frequency fan power and the operating frequency of the air cooler, and obtaining a unitary cubic function relation and a derivative function relation of the spray pump power and the spray water flow of the air cooler:
the method comprises the following steps of looking up equipment data of the air cooler or testing the air cooler, and applying a least square method to fit data to obtain a unitary cubic function relation of the power and the operating frequency of the variable-frequency fan:
Pf(F)＝afF3+bfF2+cfF+df；
in the formula, Pf(F) Is the power of the variable frequency fan, F is the operating frequency of the variable frequency fan, af、bf、cfAnd dfThe coefficient of a cubic term, the coefficient of a quadratic term, the coefficient of a primary term and a constant term of the unitary cubic function relation of the power and the operating frequency of the variable frequency fan are respectively;
and (3) carrying out derivation on the unitary cubic function relation of the power and the operating frequency of the variable frequency fan to obtain a derivative function relation of the power and the operating frequency of the variable frequency fan:
P′f(F)＝3afF2+2bfF+cf；
of formula (II)'f(F) Is the power derivative of the variable frequency fan;
fitting data to obtain a unitary cubic function relation between the spray pump power and the spray water flow of the air cooler:
Pw(W)＝awW3+bwW2+cwW+dw；
in the formula: pw(W) is the power of the spray pump, W is the spray water flow, aw、bw、cwAnd dwCubic coefficient, quadratic coefficient, primary coefficient and constant term of the unitary cubic function relation of the spray pump power and the spray water flow rate;
and (3) carrying out derivation on the unitary cubic function relation of the spray pump power and the spray water flow to obtain a derivative function relation of the spray pump power and the spray water flow:
P′w(W)＝3awW2+2bwW+cw；
in the formula: p'w(W) is the power derivative of the spray pump;
step (2) determining the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
And (3) selecting any air cooler single machine in the evaporative air cooler group as a test object to be adjusted, and determining the operation configuration after the adjustment is finished and the power saving power of the air cooler single machine relative to the power saving power before the adjustment:
selecting any one air cooler in the evaporative air cooler group as a test object, determining the combination of two parameters, namely the operating frequency of the variable frequency fan of the air cooler and the spray water flow of the spray pump when the energy consumption of the tested air cooler is the lowest on the premise of meeting the process requirements through the adjustment of the operating frequency of the variable frequency fan of the tested air cooler and the spray water flow, finishing the adjustment, and calculating the power saving power of the tested air cooler relative to the power saving power before the adjustment after the adjustment is finished;
step (4), determining the operation parameter combination when the energy consumption of each air cooler single machine in the evaporative air cooler group is lowest and the power saving power of the evaporative air cooler group:
and (4) outputting the two parameter combinations of the operating frequency of the variable frequency fan and the spray water flow after the adjustment of the tested air cooler determined in the step (3) is finished as the operating parameter combination of each air cooler single machine in the evaporative air cooler group, and multiplying the power-saving power obtained in the step (3) after the adjustment of the tested air cooler is finished relative to the power-saving power before the adjustment by the number of the air cooler single machines in the evaporative air cooler group as the power-saving power of the evaporative air cooler group.
2. The dynamic energy-saving evaluation method for the evaporative air cooler set according to claim 1, wherein the step (3) is specifically operated as follows:
step (3.1), selecting one air cooler in the evaporative air cooler group as a test object, collecting the circulating water outlet temperature T of a single machine of the tested air cooler, the operating frequency F of the variable frequency fan and the spraying water flow W of the spraying pump in real time, and determining the single-step adjustment quantity delta F of the operating frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity delta W of the spraying water flow in the single adjustment process;
step (3.2), recording the circulating water outlet temperature T of the tested air cooler before adjustmentcFrequency conversion fan operating frequency FcAnd the flow rate W of spray water of the spray pumpcAnd judging the circulating water outlet temperature T of the tested air cooler before adjustmentcWhether the circulating cooling water is higher than the circulating cooling water allowable when the circulating cooling water flows out of the evaporative air cooler group determined in the step (2)Maximum temperature value Tm: if the circulating water outlet temperature T of the tested air cooler single machine is adjustedcThe maximum allowable temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler group determined in the step (2) is highermInterrupting the step and quitting the regulation of the step (3); if the circulating water outlet temperature T of the tested air cooler single machine is adjustedcNot higher than the allowable maximum temperature value T of the circulating cooling water when flowing out of the evaporative air cooler group determined in the step (2)mEntering the step (3.3);
step (3.3), respectively adjusting the variable frequency fan and the spray pump of the tested air cooler according to the following five single-step adjusting modes, and respectively obtaining a lead function relation of the power and the operating frequency of the variable frequency fan and a lead function relation of the power and the spray water flow of the spray pump under the five single-step adjusting modes based on the step (1) to obtain a reduction delta P value of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler:
the first single-step regulation mode: the frequency conversion fan operating frequency reduces delta F and spray water flow reduces delta W, waits for 1 to 10 minutes so that the operation of the tested air cooler is stable, and the frequency conversion fan and the decline of the sum of the spray pump operating power of the corresponding tested air cooler are:
ΔP＝ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
the second single-step regulation mode: the spraying water flow is reduced by delta W while the running frequency of the variable frequency fan is kept unchanged, the waiting time is 1 to 10 minutes so that the single machine of the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the spraying pump of the tested air cooler is as follows:
ΔP＝ΔW(3awWc 2+2bwWc+cw)；
the third single-step regulation mode: the running frequency of the frequency conversion fan is reduced by delta F, the spraying water flow is kept unchanged, the waiting time is 1 to 10 minutes so that the single machine of the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the frequency conversion fan and the spraying pump of the tested air cooler is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)；
a fourth single step conditioning regime: spraying water flow, reducing the flow by delta W, increasing the running frequency of the variable-frequency fan by delta F, waiting for 1-10 minutes to ensure that the single machine of the tested air cooler runs stably, wherein the corresponding reduction of the sum of the running powers of the variable-frequency fan and the spraying pump of the tested air cooler is as follows:
ΔP＝-ΔF(3afFc 2+2bfFc+cf)+ΔW(3awWc 2+2bwWc+cw)；
a fifth single-step adjustment mode: the running frequency of the variable frequency fan is reduced by delta F and the flow of spray water is increased by delta W, the waiting time is 1 to 10 minutes so that the tested air cooler runs stably, and the corresponding reduction of the sum of the running power of the variable frequency fan and the spray pump of the tested air cooler is as follows:
ΔP＝ΔF(3afFc 2+2bfFc+cf)-ΔW(3awWc 2+2bwWc+cw)；
in the formula: delta P is the descending amount of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler and the spray pump after single-step adjustment, and is approximate to the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler before single-step adjustment minus the sum of the operating powers of the variable frequency fan and the spray pump after single-step adjustment; delta F and delta W are respectively the single-step adjustment quantity of the running frequency of the variable frequency fan of the tested air cooler and the single-step adjustment quantity of the flow of spraying water of the spraying pump in the single-step adjustment process; fcAnd WcRespectively adjusting the running frequency of a variable frequency fan of the air cooler to be tested and the flow of spraying water of a spraying pump;
step (3.4), eliminating the single step regulation mode that the value of the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler corresponding to the five single step regulation modes in the step (3.3) is less than or equal to 0, taking the rest single step regulation modes as alternative single step regulation modes, and respectively recording the reduction delta P of the sum of the operating powers of the variable frequency fan and the spray pump of the tested air cooler as a 1 st alternative single step regulation mode to an Nth alternative single step regulation mode according to the sequence from large to small, wherein: n is the number of the types of alternative single step regulation modes and is 3 or 4;
and (3.5) adjusting the air cooler to be tested according to the 1 st alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and the step (3.6) is carried out;
step (3.6), if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 1 st alternative single-step adjustment mode, and entering the step (3.7); if the step (3.5) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.5);
and (3.7) adjusting the air cooler to be tested according to the 2 nd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and the step (3.8) is carried out;
step (3.8), if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 2 nd alternative single-step adjustment mode, and entering the step (3.9); if the step (3.7) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.7);
and (3.9) adjusting the air cooler to be tested according to the 3 rd alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe magnitude relation betweenAnd entering step (3.10);
step (3.10), if the step (3.9) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 3 rd alternative single-step adjustment mode, and entering the step (3.11); if the step (3.9) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.9);
step (3.11), if the type number N of the alternative single step regulation modes determined in the step (3.4) is 3, directly entering the step (3.13); if the type number N of the alternative single-step adjusting modes determined in the step (3.4) is 4, adjusting the air cooler to be tested according to the 4 th alternative single-step adjusting mode, and judging the adjusted circulating water outlet temperature T of the air cooler to be tested and the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmThe size relation between the two and enter the step (3.12);
step (3.12), if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is greater than or equal to the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAdjusting the tested air cooler according to the opposite direction corresponding to the 4 th alternative single-step adjustment mode, and entering the step (3.13); if the step (3.11) judges that the regulated circulating water outlet temperature T of the tested air cooler is less than the allowable maximum temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupmAnd then returning to the step (3.11);
and (3.13) finishing the adjustment, and recording the running frequency F of the variable frequency fan of the tested air cooler after the adjustment is finishedeAnd the flow rate W of spray water of the spray pumpeAnd calculating the power-saving power after the adjustment is finished relative to the power-saving power before the adjustment as the combination of the operation parameters when the energy consumption of the tested air cooler is lowest on the premise of meeting the process requirements:
Figure FDA0003181349410000061
in the formula: delta PeThe power is saved after the regulation is finished relative to the power before the regulation; fe and We are respectively the running frequency of a variable frequency fan of the tested air cooler and the spraying water flow of the spraying pump after the regulation is finished.
3. The dynamic energy-saving evaluation method for the evaporative air cooler set according to claim 2, wherein the single-step adjustment amount Δ F of the operation frequency of the variable frequency fan of the air cooler to be tested and the single-step adjustment amount Δ W of the spray water flow rate of the spray pump are both fixed values, the single-step adjustment amount Δ F of the operation frequency of the variable frequency fan of the air cooler to be tested is 1% to 5% of the maximum allowable value of the operation frequency of the variable frequency fan of the air cooler to be tested, and the single-step adjustment amount Δ F of the spray water flow rate of the spray pump of the air cooler to be tested is 1% to 5% of the maximum allowable value of the spray water flow rate of the air cooler to be tested.
4. The dynamic energy-saving assessment method for the evaporative air cooler set according to claim 2, wherein the single adjustment process does not make the operation frequency of the variable frequency fan of the tested air cooler or the spray water flow rate of the spray pump exceed their respective maximum allowable values, if any single adjustment would make the operation frequency of the variable frequency fan of the tested air cooler or the spray water flow rate of the spray pump exceed their respective maximum allowable values, the adjustment test is terminated, and the combination of the operation frequency of the variable frequency fan and the spray water flow rate at the time of termination of adjustment is used as the combination of the operation parameters at the time of lowest energy consumption of the tested air cooler in accordance with the process requirements, and the power saving before relative adjustment after the end of adjustment is calculated.
5. The dynamic energy-saving assessment method for the evaporative air cooler set according to claim 2, wherein the air cooler to be tested is adjusted according to the ith alternative single-step adjustment mode, wherein i is 1, 2, 3 or 4, and the operation frequency reduction Δ F of the variable frequency fan or/and the operation frequency reduction Δ W of the spray water in the ith alternative single-step adjustment mode are changed into the operation frequency increase Δ F of the variable frequency fan or/and the operation frequency increase Δ W of the spray water.
6. A dynamic energy-saving evaluation system of an evaporative air cooler group for realizing the dynamic energy-saving evaluation method of the evaporative air cooler group as claimed in any one of claims 1 to 5, which is characterized by comprising a data input module, a data acquisition module, a data storage module, an adjustment operation module and a data display module:
the data input module, the data acquisition module, the adjusting operation module and the data display module are electrically connected with the data storage module;
the data input module is used for inputting the number of air coolers of the evaporative air cooler group, the unitary cubic function relation of the power of the variable frequency fan of the air cooler and the operating frequency of the variable frequency fan and the guide function relation thereof, the unitary cubic function relation of the power of the spray pump and the spray water flow and the guide function relation thereof, and the allowable highest temperature value T of the circulating cooling water when the circulating cooling water flows out of the evaporative air cooler groupm；
The data acquisition module is used for acquiring the circulating water outlet temperature T, the operating frequency F of the variable frequency fan and the spray water flow W of the tested air cooler in real time;
the data storage module is used for storing the data provided by the data input module, the data acquisition module and the adjusting operation module and providing the final result obtained by the adjusting operation module to the data display module;
the data display module is used for displaying the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group;
and the adjusting operation module reads the data of the data input module and the data storage module, performs dynamic energy-saving evaluation on the evaporative air cooler group, and finally obtains the operation parameter combination when the energy consumption of each air cooler in the evaporative air cooler group is the lowest and the potential power-saving power of the evaporative air cooler group.
CN202110847843.5A 2021-07-27 2021-07-27 Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group Withdrawn CN113567166A (en)

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