E. F., [32] and Tariku Iffa has made using 2-dimensional models find U-factor's attic using ready-made programs that are on the market. Which shows that the roof has a relatively low roof, tilt angle and is compatible with the thickness of the insulation is effective towards the cost U-Factor is huge, while the T. N. Anderson et al [33] has made a study of convection coefficient model of the tea within the triangular roof off using.
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