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Transcript
The Facts about Nutec’s Thermal Properties Table 1: Thermal Conductivity Values of the Nutec Product Range Nutec Roofing Unit of Bigsix & Victorian Measure Roof Sheeting Thermal Conductivity (K-Value) W/m.K 0.346 Nutec Flat Sheets Slate High Density Boards Medium Density & Ceiling Boards Test Method 0.19 0.30 0.19 ASTM C 518 Definition: Thermal Conductivity Thermal conductivity, k, is a measure of the ability of a material to conduct / transfer heat. Thermal conductivity is measured in watts per metre per Kelvin: W/(m·K) Area (m2) Thickness (m) Thermal Conductivity Rate (W m K) Thermal Energy (W ) Temperature 1 (K) Temperature 2 Temperature Difference ∆T = T 1 - T 2 (K) (K) Interpreting Nutec K-Values per Table 1 Nutec products exhibit low thermal conductivity properties when compared with other sheet roofing and cladding products. This is ideal when reduced heat build up in summer and heat loss in winter is required. Nutec product K-Value’s are influenced by the Density and Thickness of the product. Generally the thicker and more dense the product the better resistance it will have to temperature and sound transmission. Definition: R-Value Standards & Test Method The measure of resistance to heat flow. This is the ability of a material to slow the transfer of heat and is measured in R-values. The higher the R-value, the better the material's ability to resist the flow of heat through it. The R-value of a material is dependant on knowing its K-Value. The measure of resistance to heat flow, a material’s insulation R-value, is simply the reciprocal of the KValue multiplied by the thickness in metres. For example, the k-value for 6 mm ceiling board is 0.19: These are as set by ASTM International, formerly known as the American Society for Testing and Materials. ASTM C 518, Standard test method for steady-state thermal transmission properties by means of the heat flow meter apparatus. This is the same test method required and is noted as indispensable for the application of SANS 204 SANS 204, Energy efficiency in buildings The R-Value of 6 mm ceiling board is: (1/0.19) x 0.006 m = 0.032 Note: U-Value A U value is a measure of heat loss in a building element such as a wall, floor or roof. It can also be referred to as an ‘overall heat transfer co-efficient’ and measures how well parts of a building transfer heat. A low U value usually indicates high levels of insulation. They are useful as it is a way of predicting the composite behaviour of an entire building element rather than relying on the properties of individual materials. The U value is defined as being reciprocal of all the resistances of the materials found in the building element. The U-value is the reciprocal of the R-value : U= 1/R W/m 2 K www.everite.co.za > Bigsix > Victorian > Slate > Fascia > Barge board > Ceiling board > Flat sheets > Vermont Building Planks> Tongue & Groove > Window sills > Building columns >