CN103017821B - Novel condenser simulating computation experiment correction method - Google Patents
Novel condenser simulating computation experiment correction method Download PDFInfo
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- CN103017821B CN103017821B CN201210490693.8A CN201210490693A CN103017821B CN 103017821 B CN103017821 B CN 103017821B CN 201210490693 A CN201210490693 A CN 201210490693A CN 103017821 B CN103017821 B CN 103017821B
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Abstract
The invention discloses a condenser simulating calculation experiment correction method through which correct computation results can be obtained by use of less experiment data. By the correction of flow resistance at on air side and a refrigerant side as well as the correction of heat exchange efficiency, the accuracy of simulating computation can be effectively improved, the development period of a product can be effectively shortened, the production efficiency is enhanced and the experiment cost is lowered.
Description
Technical field
The utility model relates to field of automobile air conditioner, particularly relates to a kind of condenser simulation calculation experiment correction method.
Background technology
Within air-conditioning systems, the gaseous coolant of High Temperature High Pressure is condensed into the liquid refrigerants of High Temperature High Pressure by condenser, then through throttling valve, and vaporization heat absorption in evaporator.Condenser within air-conditioning systems most important.
Parallel flow condenser is because compact conformation, and heat exchange efficiency is high, low cost and other advantages and being widely used in air-conditioning system.The performance index of condenser are the important indicators judging that whether a condenser is qualified.General is all that sample measures the indexs such as its heat exchange property, windage, flow resistance through enthalpy difference experiment platform.But experiment will spend a large amount of manpower financial capacities, and experiment will take a long time.Along with the development of computer technology, people utilize computing machine to have developed specially for the software for calculation of air-condition heat exchanger.But software is not can obtain a result very accurately to all heat interchanger, needs to utilize experimental data correction, just can obtain correct result.
Summary of the invention
Technical matters to be solved by this invention is to provide one and utilizes software, utilizes less experimental data, obtains the condenser simulation calculation experiment correction method of result of calculation accurately.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of condenser simulation calculation experiment correction method, the similar condenser of selecting structure is no less than 5 groups, respectively by experiment and its performance index of computer software measurement, operating condition of test comprises: the temperature of condenser inlet pressure, the import degree of superheat, wind speed, inlet air and degree of supercooling, operating condition of test wants consistent, adopts following steps determination correction factor respectively:
(1) windage correction factor: the windage that the experiment of each experimental group under same wind speed draws is averaged, adjustment windage correction factor, makes experiment windage mean value equal with calculating windage;
(2) the flow resistance correction factor of refrigerant side: respectively the condenser of each experimental group is revised separately, the condensator outlet temperature that experiment is drawn is equal with calculating condensator outlet temperature, draw the flow resistance correction factor of each group, get the mean value of the flow resistance correction factor of each group, immediate with mean value in the flow resistance correction factor of each group is general flow resistance correction factor;
(3) heat exchange correction factor: from air side and refrigerant side two aspect correction:
Air side heat exchange correction factor: respectively the condenser of each experimental group is revised separately, the heat exchange amount that experiment is drawn is equal with calculating heat exchange amount, draw the air side heat exchange correction factor of each group, get the mean value of the air side heat exchange correction factor of each group, immediate with mean value in the air side heat exchange correction factor of each group is universal air side heat exchange correction factor;
Refrigerant side heat exchange correction factor: respectively the condenser of each experimental group is revised separately, the outlet temperature of the cold-producing medium that experiment is drawn is equal with the outlet temperature calculating cold-producing medium, draw the refrigerant side heat exchange correction factor of each group, get the mean value of the refrigerant side heat exchange correction factor of each group, immediate with mean value in the refrigerant side heat exchange correction factor of each group is universal refrigerant side heat exchange correction factor.
The flow resistance correction factor of the refrigerant side of each group, by testing the cold medium flux and refrigerant resistance that draw, draws with calculated value is suitable.
The refrigerant side heat exchange correction factor of each group is by testing the outlet superheat degree of the cold-producing medium drawn and calculated value is suitable draws.
The invention has the advantages that, less experimental data can be utilized, obtain result of calculation accurately.By the correction to air side, refrigerant side resistance to flow and heat exchange efficiency, can effectively improve simulation calculation precision.Effectively can reduce the construction cycle of product, enhance productivity, reduce experimental cost.
Accompanying drawing explanation
Fig. 1 is a kind of experimental data table of condenser;
Fig. 2 is the calculating tables of data of Fig. 1 condenser;
Fig. 3 is software pilot duty parameter inputting interface figure;
Fig. 4 is that software heat exchange coefficient calculates surface chart;
Fig. 5 is that software windage and flow resistance calculate surface chart;
Embodiment
Fig. 1 is the experimental data table of wherein a kind of condenser, and Fig. 2 is the calculating tables of data of condenser in Fig. 1, and Fig. 3 ~ 5 calculate surface chart for software, is calculate initial conditions, with the outlet subcooling of condenser, heat exchange amount determination cold medium flux with operating condition of test.After heat to be changed, cold medium flux are determined, the windage experimentally measured, flow resistance data, adjustment correlation computations coefficient.Make control errors within 5%.
For parallel flow condenser, according to the principle of similitude, ensure for revised structure similar, the thickness specifically comprising condenser is identical, spacing of fin is identical, micro-channel flat structure is identical and flow process is identical.Flat tube quantity for flat tube length, each flow process can not considered.
The similar condenser experimental data of above condition selecting structure is no less than 5 groups.
Operating condition of test comprises: condenser inlet pressure, the import degree of superheat, wind speed, the temperature of inlet air and the degree of supercooling of requirement, and operating condition of test wants consistent.
Windage correction factor: each value of getting experiment windage, averages to each value under same wind speed, and with this mean value for standard, adjustment windage correction factor, windage is equal therewith to make calculating windage.
The flow resistance correction factor of refrigerant side: because condenser exists phase transition process in heat exchanging process, out of phase resistance coefficient is also different, so experimentally out of phase resistance coefficient will be determined by surveyed refrigerant resistance, for refrigerant drag effects top hole pressure size, because degree of supercooling is fixed, so resistance to flow have impact on outlet temperature, the heat exchange property of heat exchanger has an impact.When to viscous drag correction, ensure that condensator outlet temperature, cold medium flux, refrigerant resistance and experiment record parameter identical.
For the correction of the coefficient of heat transfer, then from air side and refrigerant side two aspect correction:
Air side heat exchange correction factor: ensure that the heat Calculation value of changing under experiment air quantity conforms to experiment.
Refrigerant side heat exchange correction factor: need outlet superheat degree and the outlet temperature of considering cold-producing medium, conform to experiment value.
For the determination of final correction factor, windage correction factor can be revised by the mean value of selected experimental data, can disposable decision correction factor.
For correction term needed for other, should revise separately according to each group of experimental data, the mean value getting every correction factor after correction is reference standard.Then choosing a group correction coefficient the most close with mean value is general correction factor.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (3)
1. a condenser simulation calculation experiment correction method, it is characterized in that, the similar condenser of selecting structure is no less than 5 groups, respectively by experiment and its performance index of computer software measurement, operating condition of test comprises: the temperature of condenser inlet pressure, the import degree of superheat, wind speed, inlet air and degree of supercooling, described operating condition of test wants consistent, adopts following steps determination correction factor respectively:
(1) windage correction factor: the windage that the experiment of each experimental group under same wind speed draws is averaged, adjustment windage correction factor, makes experiment windage mean value equal with calculating windage;
(2) the flow resistance correction factor of refrigerant side: respectively the condenser of each experimental group is revised separately, the condensator outlet temperature that experiment is drawn is equal with calculating condensator outlet temperature, draw the flow resistance correction factor of each group, get the mean value of the flow resistance correction factor of each group, immediate with mean value in the flow resistance correction factor of each group is general flow resistance correction factor;
(3) heat exchange correction factor: from air side and refrigerant side two aspect correction:
Air side heat exchange correction factor: respectively the condenser of each experimental group is revised separately, the heat exchange amount that experiment is drawn is equal with calculating heat exchange amount, draw the air side heat exchange correction factor of each group, get the mean value of the air side heat exchange correction factor of each group, immediate with mean value in the air side heat exchange correction factor of each group is universal air side heat exchange correction factor;
Refrigerant side heat exchange correction factor: respectively the condenser of each experimental group is revised separately, the outlet temperature of the cold-producing medium that experiment is drawn is equal with the outlet temperature calculating cold-producing medium, draw the refrigerant side heat exchange correction factor of each group, get the mean value of the refrigerant side heat exchange correction factor of each group, immediate with mean value in the refrigerant side heat exchange correction factor of each group is universal refrigerant side heat exchange correction factor.
2. condenser simulation calculation experiment correction method as claimed in claim 1, is characterized in that, the flow resistance correction factor of the refrigerant side of each group, by testing the cold medium flux and refrigerant resistance that draw, draws with calculated value is suitable.
3. condenser simulation calculation experiment correction method as claimed in claim 1, is characterized in that, the refrigerant side heat exchange correction factor of each group is by testing the outlet superheat degree of the cold-producing medium drawn and calculated value is suitable draws.
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| CN102563805B (en) * | 2011-12-22 | 2013-11-27 | 广东美的制冷设备有限公司 | Control method for calculating exhaust temperature of compressor of air conditioner |
| CN102779217B (en) * | 2012-08-06 | 2014-07-09 | 大连三洋压缩机有限公司 | Computer simulation performance computation method of refrigeration system under frosting working condition |
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Address after: 241009 Anhui city of Wuhu Province, Hunan Road economic and Technological Development Zone No. 2-8 Patentee after: Bonaier Automotive Electrical Systems Co., Ltd. Address before: 241009 Anhui city of Wuhu Province, Hunan Road economic and Technological Development Zone No. 118 Patentee before: Wuhu Bonaire Automotive Electrical Systems Co., Ltd. |