Numerical Simulation of Natural Ventilation in Large-Scale Industrial Workshops Based on Orthogonal Test Design

2013 ◽  
Author(s):  
Yan Long ◽  
Jinming Feng ◽  
Ke Liu ◽  
Shiping Jin ◽  
Yan Fu
Keyword(s):  
Heat Source ◽  
Large Scale ◽  
Natural Ventilation ◽  
Orthogonal Test ◽  
Outdoor Environment ◽  
Industrial Plant ◽  
Test Design ◽  
Range Analysis ◽  
Orthogonal Test Design ◽  
Cfd Method

In this paper, orthogonal test design method and the CFD method were used to study the different building envelopes, and the outdoor environment of natural ventilation effect of single span of high temperature industrial workshop. Firstly, 18 ventilation models of workshop with heat source were constructed with orthogonal test design. Secondly, 18 ventilation models of workshop with heat source were simulated with CFD method. Finally, the order of the influencing factors on the ventilation of workshop was obtained through multiple index range analysis of the orthogonal experiment results according to the average temperature inside the workshop. Then the optimal combination of the best ventilation effect was selected. The research results can provide effectively theoretical basis for the future industrial plant ventilation design and optimization.

scholarly journals Orthogonal test design for optimizing the extraction of total flavonoids from Flos pueraria

2014 ◽  
Vol 8 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Cai Fei ◽  
Xiao Chen ◽  
Chen Qingjie ◽  
Ouyang Changhan ◽  
Zhang Ruixue ◽  
...  
Keyword(s):  
Orthogonal Test ◽  
Test Design ◽  
Total Flavonoids ◽  
Orthogonal Test Design

scholarly journals Optimization of hot-water ice-coring drills

2020 ◽  
pp. 1-8
Author(s):  
An Liu ◽  
Rusheng Wang ◽  
Yang Yang ◽  
Liang Wang ◽  
Xiao Li ◽  
...  
Keyword(s):  
Ice Core ◽  
Ice Cores ◽  
Orthogonal Test ◽  
Hot Water ◽  
Maximum Diameter ◽  
Test Design ◽  
Optimal Angle ◽  
Water Ice ◽  
Orthogonal Test Design ◽  
Nozzle Configuration

Abstract Hot-water ice-coring drills are often used to recover ice core samples from desirable depths in conjunction with full-scale hot-water drilling systems. However, the recovered cores exhibit varying qualities. The coring performance of a hot-water ice-coring drill depends significantly on the structure of the coring drill head (nozzle angle, diameter and number). To discover the most significant factor affecting ice-coring performance, nine types of drill heads were designed and tested in this study according to the orthogonal test design. Results indicated that the nozzle angle is the most significant factor that affects the coring quality and the optimal angle is ~15°. The number of nozzles is the second most important factor; a large number assists in obtaining ice cores of high quality. The optimal nozzle configuration to recover good quality cores are the following: the nozzle diameter, number of nozzles and nozzle angle are 1 mm, 60 nozzles and 15°, respectively, with the maximum diameter and 2 mm, 60 nozzles and 15°, respectively, with the maximum length.

Modeling of Buoyancy-Driven Natural Ventilation in Workshop: Optimization of Distance between Heat Source and Ground

2012 ◽  
Vol 170-173 ◽  
pp. 2579-2582 ◽  
Author(s):  
Ya Xin Su ◽  
A Long Su ◽  
Xin Wan
Keyword(s):  
Heat Source ◽  
Indoor Air ◽  
Energy Cost ◽  
Lower Energy ◽  
Natural Ventilation ◽  
Waste Heat ◽  
Heat Sources ◽  
Hot Air ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

Natural ventilation is suitable for application to workshops with heat sources to keep good indoor air quality at lower energy cost. In this paper, the authors numerically investigated the buoyancy-driven natural ventilation in a workshop with heat source based on computational fluid dynamics (CFD) method. The effect of the distance between heat source and ground on the air flow and temperature distribution was examined. Results showed that the average air temperature at operation zone could be effectively reduced when the distance between heat source and ground increased. The temperature field in the upper zone of the workshop was improved by diminishing the hot air zone near the ceiling and the waste heat directly going into the operation zone decreased when the distance between heat source and ground increased.

Application of Matrix Analysis in Multiple Index Orthogonal Test Design

2012 ◽  
Vol 516-517 ◽  
pp. 558-562 ◽  
Author(s):  
Xiao Ling Wei ◽  
Xiao Rui Li ◽  
Jie Hua Wang ◽  
Zhi Wen Chen
Keyword(s):  
Test Data ◽  
Orthogonal Test ◽  
Matrix Analysis ◽  
Test Design ◽  
Test Results ◽  
Optimal Plan ◽  
Test Analysis ◽  
Orthogonal Test Design ◽  
Scheme Selection ◽  
Influence Degree

In Multiple Index Orthogonal Test Design, the key question is how to determine the influence degree of each test index on the whole test results and according to the influence degree to get test data calculation and eventually gain the optimal plan to achieve the purpose of orthogonal test design. A method of matrix analysis is introduce in this article, with which the weighs of the factors and levels having influences on the tests’ results can be calculated, and then the optimal plan of multiple index orthogonal test and the important order of the factors’ influences on the tests’ index values can be determined according to the weights. Using this method to carry out the test analysis of the passing performance of the swamp bulldozer, the optimal scheme selection problem of Multiple Index Experiment of the Orthogonal Test can be solved, and obtains feasible experimental results .

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