scholarly journals Mechanical Properties and Thermal Conductivity of Thermal Insulation Board Containing Recycled Thermosetting Polyurethane and Thermoplastic

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4411
Author(s):  
Ping He ◽  
Haoda Ruan ◽  
Congyang Wang ◽  
Hao Lu
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Polyurethane Foam ◽  
Orthogonal Test ◽  
Test Design ◽  
Mechanochemical Method ◽  
Recycling Process ◽  
Strong Activity ◽  
Orthogonal Test Design ◽  
C 30

This study used a mechanochemical method to analyze the recycling mechanism of polyurethane foam and optimize the recycling process. The use of mechanochemical methods to regenerate the polyurethane foam powder breaks the C–O bond of the polyurethane foam and greatly enhances the activity of the powder. Based on orthogonal test design, the mesh, proportion, temperature, and time were selected to produce nine recycled boards by heat pressing. Then, the influence of four factors on the thermal conductivity and tensile strength of the recycled board was analyzed. The results show that 120 mesh polyurethane foam powder has strong activity, and the tensile strength can reach 9.913 Mpa when it is formed at 205 °C and 40 min with 50% PP powder. With the help of the low thermal conductivity of the polyurethane foam, the thermal conductivity of the recycled board can reach 0.037 W/m·K at the parameter of 40 mesh, 80%, 185 °C, 30 min. This research provides an effective method for the recycling of polyurethane foam.

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

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 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.

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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