CN109708261B - Optimized model selection method for configuration of two-stage centrifugal unit - Google Patents
Optimized model selection method for configuration of two-stage centrifugal unit Download PDFInfo
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Abstract
The invention discloses an optimized model selection method for configuration of a double-stage centrifugal unit, which comprises the following steps: determining a design refrigerating capacity Q, a unit performance coefficient COP and a unit gas transmission capacity V according to a design working condition and the configuration of a heat exchange container and a compressor; a sample machine set is selected and used,obtaining refrigerating capacity Q of sample unit1Coefficient of performance COP1Gas transmission volume V of unit1(ii) a And determining the calculation logic to be executed, and calculating to obtain the coefficient of performance COP (coefficient of performance) of the sample unit or more under the configuration of the minimum heat exchange container and the compressor according to the determined calculation logic. The optimization model selection method for the configuration of the double-stage centrifugal unit can quickly optimize the configuration of the compressor and the heat exchange container of the unit, calculate and select the optimal performance of the unit, reduce the cost and the operating cost and greatly shorten the design time of the unit.
Description
Technical Field
The invention relates to the field of air conditioner design, in particular to an optimal model selection method for configuration of a two-stage centrifugal unit.
Background
The method has become a great trend for promoting the comprehensive and coordinated sustainable development of the economic society, saving energy, improving the utilization efficiency of the energy and protecting and improving the environment. A central air-conditioning system with a centralized cold source for cooling is largely adopted in modern buildings, and can provide a suitable hot and humid environment for the work and life of people, but the system also consumes a large amount of energy, and according to the estimation, the annual energy consumption of the central air-conditioning system is 40% -60% of the annual energy consumption of the buildings, and the energy consumption of the cold source accounts for 60% of the design power of the air-conditioning system. The water chilling unit is a main energy consumption device for centralized cooling of a public building, the energy efficiency coefficient of the water chilling unit determines the energy saving degree of the building to a great extent, and the COP of the water chilling unit is required by GB 50189 and 2015 public building energy saving design standard and GB 19577 energy efficiency limit value and energy efficiency grade of the water chilling unit, so that a manufacturer can achieve the energy efficiency index specified by the national standard to the greatest extent on the basis of saving cost and produce more energy-saving and efficient refrigeration products.
The double-stage centrifugal unit has the characteristics of high efficiency, stability and reliability, has larger refrigerating capacity and higher coefficient of performance, has high degree of automation, can well meet the application of comfort air conditioners such as air conditioners, ice storage, heat recovery and the like, and is widely used in various large-scale air conditioning systems. In the design of the double-stage centrifugal unit, whether the configuration of the compressor and the heat exchange container is proper or not is crucial, and the overlarge compressor can increase the electric energy consumption and reduce the COP. If the heat exchange container is too large, excessive heat exchange area is wasted, and the production cost is increased; the proper configuration of the compressor and the heat exchange container can not only efficiently meet the requirements of working conditions, but also save the manufacturing cost, reduce the energy consumption and meet the COP index requirements. The types of the compressor and the heat exchange container are more, the sequential iterative computation is time-consuming and labor-consuming, and even the expected requirement of the engineering time cannot be met in time.
In order to efficiently complete the design of the two-stage centrifugal unit and the configuration of the optimal compressor and the heat exchange container, the invention provides the optimization model selection method for the configuration of the two-stage centrifugal unit, which can quickly optimize the configuration of the compressor and the heat exchange container of the unit, calculate and select the optimal performance of the unit, reduce the cost, greatly shorten the design and development time of the unit and maximally meet the requirement of the construction period.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an optimized model selection method for configuration of a two-stage centrifugal unit, provide an efficient optimized configuration calculation program, reduce the production cost of enterprises to the maximum extent, ensure stable and efficient operation of the unit, achieve the required energy efficiency index, save more energy in operation and greatly shorten the design and development time of the unit.
In order to achieve the above object, the present invention provides a method for selecting a type of a two-stage centrifugal unit, comprising:
s1, determining a design refrigerating capacity Q, a unit coefficient of performance COP and a unit gas transmission capacity V according to the design working condition, the heat exchange container and the compressor configuration; and selecting a compressor and a heat exchange container configuration which are most adaptive to the gas transmission quantity V from a database to form a sample unit.
S2, obtaining the refrigerating capacity Q of the sample unit1Coefficient of Performance (COP)1Gas transmission volume V of unit1；
S3, according to V, V1Determining the computational logic to be executed;
will V1V is divided into V1/V<0.95、0.95≤V1/V≤1.1、V1/V>1.1 three cases;
s4, obtaining the COP which meets the unit design coefficient of performance and is not lower than the COP of the sample unit coefficient of performance through the calculation logic determined in the step S31The optimal matching scheme of (2);
V1/V<when 0.95, matching is carried out from the largest heat exchange container to the smallest heat exchange container one by one; if the largest heat exchange container can not satisfy V1/V>0.95, replacing the big first compressor, and matching from the largest heat exchange container to the smallest heat exchange container one by one;
0.95≤V1when the/V is less than or equal to 1.1, the heat exchange container is gradually reduced on the basis of the matching scheme of the sample unit;
V1/V>1.1, gradually replacing the small first heat exchange container, and gradually replacing the small first compressor under the condition that the minimum first heat exchange container meets the requirement; after the small compressor is replaced, the maximum heat exchange container is matched with the minimum heat exchange container one by one.
The invention has the beneficial effects that: the configuration of a compressor and a heat exchange container of the unit is quickly optimized, the optimal performance of the unit is calculated and selected, and the design of the two-stage centrifugal unit and the configuration of the optimal compressor and the heat exchange container are efficiently matched; the unit design development time is greatly shortened, and the requirement of a construction period is met to the maximum extent; the scheme obtained at the same time can realize the best economy on the premise of meeting the requirements of customers.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, when V1/V<0.95, in time, change big heat transfer container, change big compressor, concrete step is as follows:
4101, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4109, otherwise go to step 4102;
4102, replacing the largest heat exchange container;
4103, judging V1/V>0.95？
If yes, go to step 4104; otherwise, go to step 4109;
4104, judging COP1>COP？
If yes, go to step 4105; otherwise, go to step 4125;
4105, judging whether the unit has surging or not,
if surge exists, go to step 4125; otherwise, go to step 4106;
4106, comparing the results, and storing the result of the minimum heat exchange container; namely, the existing schemes are compared, and the scheme with the smallest heat exchange container in all the schemes is selected as the best scheme for storage.
4107, judging whether there is a first heat exchange container
If yes, go to step 4108; otherwise, go to step 4109;
4108, changing a first heat exchange container; execute step 4103;
4109, judging whether there is a larger first compressor;
if yes, go to step 4110, otherwise go to step 4125;
4110, replacing the first-size compressor;
4111, replacing the largest heat exchange container;
4112, judge V1/V>0.95？
If yes, go to step 4113, otherwise go to step 4109;
4113, determining COP1>COP？
If yes, go to step 4114, otherwise go to step 4125;
4114, judging whether the unit is surging,
if surge exists, go to step 4125; otherwise, go to step 4115;
4115, exchanging a minimum heat exchange container;
4116, judge V1/V<1.1？
If yes, go to step 4117, otherwise go to step 4125;
4117, replacing the largest heat exchange container;
4118, judge V1/V>0.95,
If yes, go to step 4119, otherwise go to step 4125;
4119, judge V1/V<1.1？
If yes, go to step 4120; otherwise, go to step 4123;
4120 determination of COP1>COP？
If yes, go to step 4121; otherwise, go to step 4125;
4121 determining whether the unit is in surge
If surging, execute step 4125; otherwise, go to step 4122;
4122 comparing the results, storing the minimum heat exchange container result, and executing step 4123;
4123 judging whether there is a first heat exchange container;
if yes, go to step 4124; otherwise, go to step 4125;
4124, change to the first heat exchange container, execute step 4118;
4125, judging whether there is an optimal solution;
if yes, output the best solution, go to step 4126;
otherwise, outputting no solution, and executing step 4126;
4126, end.
The beneficial effect of adopting the further scheme is that: after the large heat exchange container is replaced, the COP of the unit in different compressor configurations is calculated through calculation of calculation logic, and the ratio V of the gas transmission capacity of the compressor to the gas transmission capacity of the sample compressor is expected to be designed1and/V, under the condition of no surge, the optimal configuration of the compressor and the heat exchange container is obtained.
Further, when V is more than or equal to 0.951When the V is less than or equal to 1.1, the concrete steps are as follows:
4201, judging COP1>COP？
If yes, go to step 4202; otherwise, go to step 4203;
4202, judging whether the unit is surging;
if surging, go to step 4203, otherwise, go to step 4208;
4203, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4125; otherwise, go to step 4204;
4204, exchanging a maximum heat exchange container;
4205, judging COP1>COP？
If yes, go to step 4206; otherwise, go to step 4125;
4206, judging whether surge exists;
if so, go to step 4125; otherwise, go to step 4208;
4208, comparing the results, storing the result of the minimum heat exchange container, and executing step 4209;
4209, judging whether there is a first heat exchange container,
if yes, go to step 4210; otherwise, go to step 4125;
4210 replacing a first heat exchange container;
4211, judging V is not less than 0.951/V≤1.1？,
If yes, go to step 4212; otherwise, go to step 4125;
4212 determination of COP1>COP？
If yes, go to step 4213; otherwise, go to step 4125;
4213, judging whether surge occurs;
if not, go to step 4214; otherwise, go to step 4125;
4214, comparing the results, storing the minimum heat exchange container result, and executing step 4209.
The beneficial effect of adopting the further scheme is that: calculating COP of the unit under different heat exchange container configurations through calculation of calculation logic, and designing the ratio of the gas transmission capacity of the compressor to the gas transmission capacity of the sample compressorValue V1and/V, obtaining the optimal configuration of the compressor and the heat exchange container, and enabling the unit to always operate at the maximum performance point.
Further, when V1/V>1.1, change little heat transfer container, change little compressor, concrete step is as follows:
4301, judging whether it is the minimum heat exchange container
If yes, go to step 4308; otherwise, executing step 4302;
4302, changing a first small heat exchange container;
4303, judge V1/V>1.1？
If yes, go to step 4302; otherwise, executing step 4304;
4304, judge V1/V>0.95？
If yes, go to step 4305; otherwise, go to step 4308;
4305, determining COP1>COP？
If yes, go to step 4306; otherwise, go to step 4308;
4306 judging whether the unit has surge
If surge exists, executing step 4308; otherwise, go to step 4307;
4307, comparing the results, storing the result of the minimum heat exchange container, and executing the step 4301;
4308, judge whether there is a small first compressor;
if yes, replacing the small first compressor, and executing the step 4309; otherwise, go to step 4125;
4309, replacing the minimum heat exchange container;
4310, judgment of V1/V<1.1？
If yes, go to step 4311; otherwise, go to step 4308;
4311, replacing the largest heat exchange container;
4312, judgment V1/V>0.95？
If yes, go to step 4313; otherwise, go to step 4125;
4313, judging COP1>COP？
If yes, go to step 4314; otherwise, go to step 4125;
4314, judging whether the unit is surging;
if there is no surge, go to step 4315; otherwise, go to step 4125;
4315, comparing the results, and storing the result of the minimum heat exchange container;
4316, judging whether there is a first heat exchange container,
if yes, go to step 4317; otherwise, go to step 4125;
4317, replacing the first small heat exchange container; step 4312 is performed.
The beneficial effect of adopting the further scheme is that: after the small heat exchange container is replaced, the COP of the unit under different compressor configurations is calculated through calculation of calculation logic, and the ratio V of the gas transmission capacity of the compressor to the gas transmission capacity of the sample compressor is expected to be designed1and/V, under the condition of no surge, the optimal configuration of the compressor and the heat exchange container is obtained.
Drawings
FIG. 1 is a flow chart of an optimized model selection method for a dual stage centrifuge set configuration of the present invention;
FIG. 2 is a flowchart of the calculation of V1/V <0.95 in the typing method of the present invention;
FIG. 3 is a flowchart of the calculation of 0.95. ltoreq. V1/V. ltoreq.1 in the model selection method of the present invention;
FIG. 4 is a flowchart of the calculation when V1/V >1.1 in the typing method of the present invention;
in the attached drawings, a separately appearing "container" is a short for "heat exchange container";
the reference symbols in the drawings indicate the following steps:
s1, determining a design refrigerating capacity Q, a unit performance coefficient COP and a unit gas transmission capacity V according to design working conditions, heat exchange container and compressor configuration; selecting a compressor and a heat exchange container which are most adaptive to the gas transmission quantity V from a database to configure so as to form a sample unit;
s2, obtaining refrigerating capacity Q of sample unit1Coefficient of Performance (COP)1Gas transmission volume V of unit1；
S3, according to V, V1Determining the computational logic to be executed;
s4, obtaining the coefficient of performance COP (coefficient of performance) which meets the unit design coefficient of performance and is not lower than the coefficient of performance COP of the sample unit1The optimal matching scheme of (2);
4101, judging whether the heat exchange container is the largest heat exchange container;
4102, replacing the largest heat exchange container;
4103, judging V1/V>0.95？
4104, judging COP1>COP？
4105, judging whether the unit has surging or not,
4106, comparing the results, and storing the result of the minimum heat exchange container;
4107, judging whether there is a first heat exchange container
4108, changing a first heat exchange container;
4109, judging whether there is a larger first compressor;
4110, replacing the first-size compressor;
4111, replacing the largest heat exchange container;
4112, judge V1/V>0.95？
4113, determining COP1>COP？
4114, judging whether the unit surges;
4115, exchanging a minimum heat exchange container;
4116, judge V1/V<1.1？
4117, replacing the largest heat exchange container;
4118, judge V1/V>0.95；
4119, judge V1/V<1.1？
4120 determination of COP1>COP？
4121 determining whether the unit is in surge
4122 comparing the results, and storing the result of the minimum heat exchange container;
4123 judging whether there is a first heat exchange container;
4124 replacing the first heat exchange container with a small one;
4125, judging whether there is an optimal solution;
4126, end;
4201, judging COP1>COP？
4202, judging whether the unit is surging;
4203, judging whether the heat exchange container is the largest heat exchange container;
4204, exchanging a maximum heat exchange container;
4205, judging COP1>COP？
4206, judging whether surge exists;
4208, comparing the results, and storing the results of the minimum heat exchange container;
4209, judging whether there is a first heat exchange container;
4210 replacing a first heat exchange container;
4211, judging V is not less than 0.951/V≤1.1？
4212 determination of COP1>COP？
4213, judging whether surge occurs;
4214, comparing the results, and storing the result of the minimum heat exchange container; 4301, judging whether the heat exchange container is the minimum heat exchange container;
4302, changing a first small heat exchange container;
4303, judge V1/V>1.1？
4304, judge V1/V>0.95？
4305, determining COP1>COP？
4306, judge whether the unit surges;
4307, comparing results, and storing the result of the minimum heat exchange container;
4308, judge whether there is a small first compressor;
4309, replacing the minimum heat exchange container;
4310, judgment of V1/V<1.1？
4311, replacing the largest heat exchange container;
4312, judgment V1/V>0.95？
4313, judging COP1>COP？
4314, judging whether the unit is surging;
4315, comparing the results, and storing the result of the minimum heat exchange container;
4316, judging whether there is a first heat exchange container,
4317, change the small first heat exchange container.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic flow chart of a method for optimizing and selecting a type of a configuration of a dual-stage centrifuge set according to an embodiment of the present invention. As shown in fig. 1, the type selection method includes:
s1, determining a design refrigerating capacity Q, a unit coefficient of performance COP and a unit gas transmission capacity V according to the design working condition, the heat exchange container and the compressor configuration; selecting a compressor and a heat exchange container which are most adaptive to the gas transmission quantity V from a database to configure so as to form a sample unit; the database refers to a set of optional equipment formed by summarizing all available compressors and heat exchange containers by an enterprise, wherein the optional equipment comprises the specifications, models and performance parameters of all the compressors and the heat exchange containers, and all the design implementation is established in the database for various matching of the compressors and the heat exchange containers; the optimal matching with the gas transmission volume V means that the matched theoretical gas transmission volume is closest to the designed gas transmission volume V in terms of value, can be larger than the gas transmission volume V, and also can be smaller than the gas transmission volume V, but is closest to the designed gas transmission volume V.
S2, obtaining the refrigerating capacity Q of the sample unit1Coefficient of Performance (COP)1Gas transmission volume V of unit1；
S3, according to V, V1Determining the computational logic to be executed;
will V1V is divided into V1/V<0.95、0.95≤V1/V≤1.1、V1/V>1.1 three cases;
s4, obtaining the coefficient C meeting the unit design performance through the calculation logic determined in the step S3OP not lower than COP of coefficient of performance of sample unit1The optimal matching scheme of (1), specifically:
when V is1/V<When 0.95, matching is carried out from the largest heat exchange container to the smallest heat exchange container one by one; if the largest heat exchange container can not satisfy V1/V>0.95, replacing the big first compressor, and matching from the largest heat exchange container to the smallest heat exchange container one by one;
when 0.95<V1/V<1.1, gradually reducing the heat exchange container on the basis of the matching scheme of the sample unit;
when V is1/V>1.1, gradually replacing the small first heat exchange container, and gradually replacing the small first compressor under the condition that the minimum first heat exchange container meets the requirement; after the small compressor is replaced, the maximum heat exchange container is matched with the minimum heat exchange container one by one.
The model selection method provided in the above embodiment determines the design refrigerating capacity Q, the unit coefficient of performance COP and the unit gas transmission capacity V through the design working condition and the configuration of the heat exchange container and the compressor; refrigerating capacity Q of sampling unit1Coefficient of Performance (COP)1Gas transmission volume V of unit1(ii) a Determining computational logic to be executed; and according to the determined calculation logic, calculating to obtain the COP (coefficient of performance) not lower than the sample unit under the configuration of the minimum heat exchange container. The configuration of the heat exchange container of the unit is optimized, the optimal performance is calculated and selected, the cost is reduced, and the design and development time of the unit is greatly shortened.
Alternatively, as an embodiment of the present invention, as shown in fig. 2, when V is1/V<And at 0.95, replacing the large heat exchange container and the large compressor, and determining to execute the calculation logic. The method comprises the following specific steps:
4101, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4109, otherwise go to step 4102;
4102, replacing the largest heat exchange container;
4103, judging V1/V>0.95？
If yes, go to step 4104; otherwise, go to step 4109;
4104, judging COP1>COP？
If yes, go to step 4105; otherwise, go to step 4125;
4105, judging whether the unit has surging or not,
if surge exists, go to step 4125; otherwise, go to step 4106;
4106, comparing the results, and storing the result of the minimum heat exchange container;
4107, judging whether there is a first heat exchange container
If yes, go to step 4108; otherwise, go to step 4109;
4108, changing a first heat exchange container; execute step 4103;
4109, judging whether there is a larger first compressor;
if yes, go to step 4110, otherwise go to step 4125;
4110, replacing the first-size compressor;
4111, replacing the largest heat exchange container;
4112, judge V1/V>0.95？
If yes, go to step 4113, otherwise go to step 4109;
4113, determining COP1>COP？
If yes, go to step 4114, otherwise go to step 4125;
4114, judging whether the unit is surging,
if surge exists, go to step 4125; otherwise, go to step 4115;
4115, exchanging a minimum heat exchange container;
4116, judge V1/V<1.1？
If yes, go to step 4117, otherwise go to step 4125;
4117, replacing the largest heat exchange container;
4118, judge V1/V>0.95,
If yes, go to step 4119, otherwise go to step 4125;
4119, judge V1/V<1.1？
If yes, go to step 4120; otherwise, go to step 4123;
4120 determination of COP1>COP？
If yes, go to step 4121; otherwise, go to step 4125;
4121 determining whether the unit is in surge
If surging, execute step 4125; otherwise, go to step 4122;
4122 comparing the results, storing the minimum heat exchange container result, and executing step 4123;
4123 judging whether there is a first heat exchange container;
if yes, go to step 4124; otherwise, go to step 4125;
4124, change to the first heat exchange container, execute step 4118;
4125, judging whether there is an optimal solution;
if yes, output the best solution, go to step 4126;
otherwise, outputting no solution, and executing step 4126;
4126, end.
Through calculation of calculation logic, after a large compressor is replaced, the minimum heat exchange container configuration meeting the requirements is screened and calculated through calculation of the calculation logic, COP of the unit in different compressor configurations is solved, and the ratio V of the gas transmission capacity of the compressor to the gas transmission capacity of the sample compressor to be expected and designed is achieved1and/V, under the condition of no surge, the optimal configuration of the compressor and the heat exchange container is obtained.
As shown in FIG. 3, when V is 0.95. ltoreq.V1When the V is less than or equal to 1.1, the further steps are as follows:
4201, judging COP1>COP？
If yes, go to step 4202; otherwise, go to step 4203;
4202, judging whether the unit is surging;
if surging, go to step 4203, otherwise, go to step 4208;
4203, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4125; otherwise, go to step 4204;
4204, exchanging a maximum heat exchange container;
4205, judging COP1>COP？
If yes, go to step 4206; otherwise, go to step 4125;
4206, judging whether surge exists;
if so, go to step 4125; otherwise, go to step 4208;
4208, comparing the results, storing the result of the minimum heat exchange container, and executing step 4209;
4209, judging whether there is a first heat exchange container,
if yes, go to step 4210; otherwise, go to step 4125;
4210 replacing a first heat exchange container;
4211, judging V is not less than 0.951/V≤1.1？,
If yes, go to step 4212; otherwise, go to step 4125;
4212 determination of COP1>COP？
If yes, go to step 4213; otherwise, go to step 4125;
4213, judging whether surge occurs;
if not, go to step 4214; otherwise, go to step 4125;
4214, comparing the results, storing the minimum heat exchange container result, and executing step 4209.
The model selection method provided by the embodiment calculates COP of the unit in different heat exchange container configurations through calculation of calculation logic, and designs the ratio V of the gas transmission capacity of the compressor to the gas transmission capacity of the sample compressor1and/V, obtaining the optimal configuration of the compressor and the heat exchange container, and enabling the unit to always operate at the maximum performance point.
When V is shown in FIG. 41/V>1.1, the small-size compressor and the small heat exchange container are replaced first to reduce V1The computational logic to be executed is determined. Further, when the small heat exchange container is replaced, the small compressor is replaced, and the calculation logic to be executed is determined, the specific steps are as follows:
4301, judging whether it is the minimum heat exchange container
If yes, go to step 4308; otherwise, executing step 4302;
4302, changing a first small heat exchange container;
4303, judge V1/V>1.1？
If yes, go to step 4302; otherwise, executing step 4304;
4304, judge V1/V>0.95？
If yes, go to step 4305; otherwise, go to step 4308;
4305, determining COP1>COP？
If yes, go to step 4306; otherwise, go to step 4308;
4306 judging whether the unit has surge
If surge exists, executing step 4308; otherwise, go to step 4307;
4307, comparing the results, storing the result of the minimum heat exchange container, and executing the step 4301;
4308, judge whether there is a small first compressor;
if yes, replacing the small first compressor, and executing the step 4309; otherwise, go to step 4125;
4309, replacing the minimum heat exchange container;
4310, judgment of V1/V<1.1？
If yes, go to step 4311; otherwise, go to step 4308;
4311, replacing the largest heat exchange container;
4312, judgment V1/V>0.95？
If yes, go to step 4313; otherwise, go to step 4125;
4313, judging COP1>COP？
If yes, go to step 4314; otherwise, go to step 4125;
4314, judging whether the unit is surging;
if there is no surge, go to step 4315; otherwise, go to step 4125;
4315, comparing the results, and storing the result of the minimum heat exchange container;
4316, judging whether there is a first heat exchange container,
if yes, go to step 4317; otherwise, go to step 4125;
4317, replacing the first small heat exchange container; step 4312 is performed.
The beneficial effect of adopting the further scheme is that: after the small heat exchange container and the small compressor are replaced, the gas transmission quantity V is reduced1Calculating the COP of the unit in different compressor configurations through calculation of calculation logic to reach the ratio V of the expected designed compressor gas transmission capacity to the sample compressor gas transmission capacity1and/V, under the condition of no surge, the optimal configuration of the compressor and the heat exchange container is obtained.
It should be understood that, in the above embodiment, only the step S4 described in fig. 1 is further described, and as a complete technical solution, the embodiment further needs to include the step S1 to the step S3, and for brevity of description, details are not described here again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. An optimized model selection method for configuration of a double-stage centrifugal unit comprises the following steps:
s1, determining a design refrigerating capacity Q, a unit coefficient of performance COP and a unit gas transmission capacity V according to the design working condition, the heat exchange container and the compressor configuration; selecting a compressor and a heat exchange container which are most adaptive to the gas transmission quantity V from a database to configure so as to form a sample unit;
the method is characterized by further comprising the following steps:
s2, obtaining the refrigerating capacity Q of the sample unit1Coefficient of Performance (COP)1Gas transmission volume V of unit1；
S3, according to V, V1Determining the computational logic to be executed;
will V1V is divided into V1/V<0.95、0.95≤V1/V≤1.1、V1/V>1.1 three cases;
s4, obtaining the COP which meets the unit design coefficient of performance and is not lower than the COP of the sample unit coefficient of performance through the calculation logic determined in the step S31The optimal matching scheme of (1), specifically:
when V is1/V<When 0.95, matching is carried out from the largest heat exchange container to the smallest heat exchange container one by one; if the largest heat exchange container can not satisfy V1/V>0.95, replacing the big first compressor, and matching from the largest heat exchange container to the smallest heat exchange container one by one;
when 0.95<V1/V<1.1, gradually reducing the heat exchange container on the basis of the matching scheme of the sample unit;
when V is1/V>1.1, gradually replacing the small first heat exchange container, and gradually replacing the small first compressor under the condition that the minimum first heat exchange container meets the requirement; after the small compressor is replaced, the maximum heat exchange container is matched with the minimum heat exchange container one by one.
2. The method of claim 1, wherein V is the number V in step 41/V<At 0.95, the specific calculation steps are as follows:
4101, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4109, otherwise go to step 4102;
4102, replacing the largest heat exchange container;
4103, judging V1/V>0.95？
If yes, go to step 4104; otherwise, go to step 4109;
4104, judging COP1>COP？
If yes, go to step 4105; otherwise, go to step 4125;
4105, judging whether the unit has surging or not,
if surge exists, go to step 4125; otherwise, go to step 4106;
4106, comparing the results, and storing the result of the minimum heat exchange container;
4107, judging whether there is a first heat exchange container
If yes, go to step 4108; otherwise, go to step 4109;
4108, changing a first heat exchange container; execute step 4103;
4109, judging whether there is a larger first compressor;
if yes, go to step 4110, otherwise go to step 4125;
4110, replacing the first-size compressor;
4111, replacing the largest heat exchange container;
4112, judge V1/V>0.95？
If yes, go to step 4113, otherwise go to step 4109;
4113, determining COP1>COP？
If yes, go to step 4114, otherwise go to step 4125;
4114, judging whether the unit is surging,
if surge exists, go to step 4125; otherwise, go to step 4115;
4115, exchanging a minimum heat exchange container;
4116, judge V1/V<1.1？
If yes, go to step 4117, otherwise go to step 4125;
4117, replacing the largest heat exchange container;
4118, judge V1/V>0.95,
If yes, go to step 4119, otherwise go to step 4125;
4119, judge V1/V<1.1？
If yes, go to step 4120; otherwise, go to step 4123;
4120 determination of COP1>COP？
If yes, go to step 4121; otherwise, go to step 4125;
4121 determining whether the unit is in surge
If surging, execute step 4125; otherwise, go to step 4122;
4122 comparing the results, storing the minimum heat exchange container result, and executing step 4123;
4123 judging whether there is a first heat exchange container;
if yes, go to step 4124; otherwise, go to step 4125;
4124, change to the first heat exchange container, execute step 4118;
4125, judging whether there is an optimal solution;
if yes, output the best solution, go to step 4126;
otherwise, outputting no solution, and executing step 4126;
4126, end.
3. The method as claimed in claim 1, wherein V is 0.95. ltoreq. V in step 41When the/V is less than or equal to 1.1, the specific calculation steps are as follows:
4201, judging COP1>COP？
If yes, go to step 4202; otherwise, go to step 4203;
4202, judging whether the unit is surging;
if surging, go to step 4203, otherwise, go to step 4208;
4203, judging whether the heat exchange container is the largest heat exchange container;
if yes, go to step 4125; otherwise, go to step 4204;
4204, exchanging a maximum heat exchange container;
4205, judging COP1>COP？
If yes, go to step 4206; otherwise, go to step 4125;
4206, judging whether surge exists;
if so, go to step 4125; otherwise, go to step 4208;
4208, comparing the results, storing the result of the minimum heat exchange container, and executing step 4209;
4209, judging whether there is a first heat exchange container,
if yes, go to step 4210; otherwise, go to step 4125;
4210 replacing a first heat exchange container;
4211, judgment0.95≤V1/V≤1.1？,
If yes, go to step 4212; otherwise, go to step 4125;
4212 determination of COP1>COP？
If yes, go to step 4213; otherwise, go to step 4125;
4213, judging whether surge occurs;
if not, go to step 4214; otherwise, go to step 4125;
4214, comparing the results, storing the minimum heat exchange container result, and executing step 4209.
4. The method of claim 1, wherein V is the number V in step 41/V>1.1, the specific calculation steps are as follows:
4301, judging whether it is the minimum heat exchange container
If yes, go to step 4308; otherwise, executing step 4302;
4302, changing a first small heat exchange container;
4303, judge V1/V>1.1？
If yes, go to step 4302; otherwise, executing step 4304;
4304, judge V1/V>0.95？
If yes, go to step 4305; otherwise, go to step 4308;
4305, determining COP1>COP？
If yes, go to step 4306; otherwise, go to step 4308;
4306, judge whether the unit surges;
if surge exists, executing step 4308; otherwise, go to step 4307;
4307, comparing the results, storing the result of the minimum heat exchange container, and executing the step 4301;
4308, judge whether there is a small first compressor;
if yes, replacing the small first compressor, and executing the step 4309; otherwise, go to step 4125;
4309, replacing the minimum heat exchange container;
4310, judgment of V1/V<1.1？
If yes, go to step 4311; otherwise, go to step 4308;
4311, replacing the largest heat exchange container;
4312, judgment V1/V>0.95？
If yes, go to step 4313; otherwise, go to step 4125;
4313, judging COP1>COP？
If yes, go to step 4314; otherwise, go to step 4125;
4314, judging whether the unit is surging;
if there is no surge, go to step 4315; otherwise, go to step 4125;
4315, comparing the results, and storing the result of the minimum heat exchange container;
4316, judging whether there is a first heat exchange container,
if yes, go to step 4317; otherwise, go to step 4125;
4317, replacing the first small heat exchange container; step 4312 is performed.
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