International Journal of Interdisciplinary Research
Table 4 Coefficients for response surface equations for four input parameters
Coefficients of \(x_{1} ,x_{2} ,x_{3} x_{4}\) | Parameters | Thermal resistance × 10−3 (Km2/W) | Thermal absorptivity (Ws1/2/m2K) | Air permeability (cm3/cm2/s) | Moisture vapour transmission rate (g/m2/24 h) | |
|---|---|---|---|---|---|---|
Linear terms | β o | constant | 33.93 | −27.92 | 221.67 | 52.81 |
β 1 | x 1 | 86.42 | 608.91 | 1499.1 | 84.35 | |
β 2 | x 2 | −609.08 | −4400.8 | −10,841 | −602.47 | |
β 3 | x 3 | 1.01 | 2.58 | 5.22 | −1.56 | |
β 4 | x 4 | −12 | 22.31 | 70.28 | 3.21 | |
Interaction terms | β 5 | x 1 x 2 | −53.93 | 401.82 | 979.64 | 55.20 |
β 6 | x 1 x 3 | 0.13 | 0.625 | 0.296 | 0.092 | |
β 7 | x 1 x 4 | −0.028 | 0.158 | 0.825 | 0.058 | |
β 8 | x 2 x 3 | −1.06 | −0.857 | 0.32 | −0.22 | |
β 9 | x 2 x 4 | −0.33 | −1.77 | −1.07 | −0.028 | |
β 10 | x 3 x 4 | 0.0043 | −0.0192 | −0.47 | −0.023 | |
Square terms | β 11 | x 21 | 7.41 | −56.32 | −136.23 | −7.75 |
β 12 | x 22 | 6.85 | −3.12 | −6.98 | −0.31 | |
β 13 | x 23 | −0.00016 | −0.095 | −0.096 | 2.35e−4 | |
β 14 | x 24 | 1.14 | −2.51 | 8.60 | 0.33 |