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ⅰ ABSTRACT ⅱ ⅴ List of Table ⅵ List of Figures ⅶ 1 1 2 3 3 3 4 4 5 - iii -
7 7 8 9 10 11 12 13 14 15 SN 15 SN 16 17 - iv -
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List of table Table 1 Design factors levels 18 Table 2 Dimensions of district heating pipe 18 Table 3 Material properties of each part 19 Table 4 Orthogonal table L 9 (3 4 ) 20 Table 5 Experimental layout L 9 (3 4 ) and data collection of 200A 21 Table 6 Factors and SN ratio response table of 200A 21 Table 7 Experimental layout L 9 (3 4 ) and data collection of 400A 22 Table 8 Factors and SN ratio response table of 400A 22 Table 9 Experimental layout L 9 (3 4 ) and data collection of 800A 23 Table 10 Factors and SN ratio response table of 800A 23 Table 11 Comparison of maximum shear stress of PUR 24 - vi -
List of figures Fig. 1 District heating pipe system 25 Fig. 2 Pressed foam-pad over long periods 26 Fig. 3 Conditions of District Heating Pipe System 27 Fig. 4 CAD and FEM model for district heating pipe 28 Fig. 5 Bend shape for district heating pipe 29 Fig. 6 Shear stress distribution of PUR foam (200A) 30 Fig. 7 Shear stress distribution of PUR foam (400A) 35 Fig. 8 Shear stress distribution of PUR foam (800A) 40 Fig. 9 Influential factors Vs. SN ratio 45 - vii -
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μ μ γ π γ π γ Φ - 8 -
α ν α π ν π - 9 -
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Size Factors Description Levels 1 2 3 A Number 1 3 5 200A B Height (mm) 12 15.5 19 C Thickness (mm) 20 25 30 A Number 1 3 5 400A B Height (mm) 20 25 30 C Thickness (mm) 25 30 35 A Number 1 3 5 800A B Height (mm) 20 25 30 C Thickness (mm) 50 60 70-19 -
Size Carrier Pipe HDPE PUR thickness (mm) Di (mm) Do (mm) Di (mm) Do (mm) 200A 203.5 216.3 43.7 303.8 315.0 400A 393.6 406.4 67.0 540.4 560.0 800A 793.8 812.8 76.0 964.8 1000.0-20 -
구성품내관 (Carrier Pipe) 보온재 (Insulation) 재질명 PG38W (SPPS38) PUR Foam 탄성계수포와송비허용응력 [MPa] (Elastic 열팽창계수 (Possion's Modulus) [1/ C] Ratio) 인장압축전단 [MPa] 210000 0.3 841 154-29 0.31 0.42 0.3 0.2 외관 (Casing) 토사 (Soil) HDPE 827 0.35 17 10.2 - soft clay 2~20 0.3 - - - - - 21 -
No. A B e C 1 2 3 4 Experiment Condition 1 1 1 1 1 A1B1C1 2 1 2 2 2 A1B2C2 3 1 3 3 3 A1B3C3 4 2 1 2 3 A2B1C3 5 2 2 3 1 A2B2C1 6 2 3 1 2 A2B3C2 7 3 1 3 2 A3B1C2 8 3 2 1 3 A3B2C3 9 3 3 2 1 A3B3C1-22 -
Size Experiment condition SN ratio Max. shear stress of PUR foam (MPa) A1B1C1 11.36 0.27030 A1B2C2 12.88 0.22690 A1B3C3 14.00 0.19950 A2B1C3 14.15 0.19605 200A A2B2C1 12.90 0.22634 A2B3C2 15.23 0.17309 A3B1C2 14.80 0.18192 A3B2C3 16.27 0.15370 A3B3C1 15.11 0.17553 A3B3C3 ( 최적모델 ) 17.37 0.13539-23 -
A B C Sum SN ratio (200A) Level 1 12.75 13.44 13.13 Level 2 14.10 14.02 14.31 Level 3 15.39 14.78 14.81 126.72 Sum of squares 1.1660 0.3028 0.4960 1.965 Contribution (%) 59.35 15.41 25.24 100.00-24 -
Size Experiment condition SN ratio Max. shear stress of PUR foam (MPa) A1B1C1 11.25 0.27390 A1B2C2 12.48 0.23773 A1B3C3 13.35 0.21514 A2B1C3 12.77 0.22988 400A A2B2C1 12.43 0.23897 A2B3C2 14.42 0.19010 A3B1C2 13.53 0.21058 A3B2C3 14.86 0.18077 A3B3C1 14.04 0.19861 A3B3C3 ( 최적모델 ) 15.78 0.16251-25 -
A B C Sum SN ratio (400A) Level 1 12.36 12.52 12.57 Level 2 13.21 13.26 13.48 Level 3 14.14 13.94 13.66 119.12 Sum of squares 0.5319 0.3357 0.2248 1.092 Contribution (%) 48.69 30.73 20.58 100.00-26 -
Size Experiment condition SN ratio Max. shear stress of PUR foam (MPa) A1B1C1 9.21 0.34653 A1B2C2 9.93 0.31868 A1B3C3 10.37 0.30308 A2B1C3 10.69 0.29192 800A A2B2C1 10.29 0.30567 A2B3C2 11.02 0.28134 A3B1C2 11.20 0.27550 A3B2C3 12.21 0.24529 A3B3C1 11.57 0.26391 A3B3C3 ( 최적모델 ) 13.13 0.22047-27 -
A B C Sum SN ratio (800A) Level 1 9.84 10.37 10.36 Level 2 10.67 10.81 10.72 Level 3 11.66 10.99 11.09 96.49 Sum of squares 0.5550 0.0680 0.0896 0.713 Contribution (%) 77.89 9.54 12.57 100.00-28 -
Size With Foam-pad With Shear ring Max. shear stress of PUR (MPa) Improvement ratio(%) 200A 0.19 0.14 26.32 400A 0.23 0.16 30.43 800A 0.36 0.22 38.89-29 -
1 Carrier steel pipe 2 Polyurethane insulator 3 High density polyethylene 4 Leak detection line - 30 -
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