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標(biāo)準(zhǔn)：ASTM C518–用熱流量計(jì)裝置測(cè)定穩(wěn)態(tài)熱傳遞特性的標(biāo)準(zhǔn)試驗(yàn)方法
范圍：本測(cè)試適用于各種材料。
適用產(chǎn)品：保溫材料、建筑材料、窗戶(hù)材料
測(cè)試程序：本測(cè)試使用熱流量計(jì)裝置（HFM）。熱流量計(jì)由一塊冷板和一塊熱板組成，熱板上裝有熱通量傳感器，用于測(cè)量熱流。待測(cè)量的材料被放置在兩個(gè)板之間，這兩個(gè)板被控制到不同的溫度，以產(chǎn)生從熱板到冷板的熱流，該熱流由傳感器測(cè)量。該裝置針對(duì)已知導(dǎo)熱率的材料進(jìn)行校準(zhǔn)，可用于測(cè)量厚度和導(dǎo)電率范圍較廣的扁平材料。測(cè)試通常在35oF至110oF的平均溫度下進(jìn)行，最常見(jiàn)的是75oF。通常使用40oF–50oF的溫差。
最終結(jié)果：確定了熱導(dǎo)率（k值）和熱阻（R值）。這些值可用于確定材料的能量損失。該測(cè)試可用于滿足絕緣材料的R值規(guī)定，如美國(guó)聯(lián)邦貿(mào)易委員會(huì)的“R值規(guī)則”（10 CFR 460）。
特別注意：該方法通常可以用作ASTM C177的替代品，ASTM C177使用一種稱(chēng)為防護(hù)熱板裝置（GHP）的不同裝置測(cè)定相同的性能。
Standard: ASTM C518 – Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
Scope: This test is used on a wide range of materials.
Applicable Products: Insulation, construction materials, window materials
Test Procedure: This test uses a Heat Flow Meter Apparatus (HFM). The Heat Flow Meter consists of a cold plate and a hot plate which incorporate heat flux transducers for measuring heat flow. The material to be measured is placed between the two plates which are controlled to different temperatures to create a heat flow from hot to cold plate, which is measured by the transducers. The device is calibrated against materials of known thermal conductivity and can be used to measure flat materials in a wide range of thickness and conductivity. Tests are commonly performed with a mean temperature between 35oF and 110oF, with the most common being 75oF. A temperature difference of 40oF – 50oF is commonly used.
End Result: The thermal conductivity (k-Value) and thermal resistance (R-Value) are determined. These values can be used to determine energy losses through a material. This test can be used to satisfy R-Value regulations for insulation materials, such as the US Federal Trade Commission’s “R-Value Rule” (10 CFR 460).
Special Notes: This method can often be used as an alternative to ASTM C177, which determines the same properties using a different device known as a Guarded Hot Plate Apparatus (GHP).
更多關(guān)于ASTM C518穩(wěn)態(tài)熱傳導(dǎo)性能測(cè)試/導(dǎo)熱系數(shù)檢測(cè)，請(qǐng)咨詢(xún)南京睿督公司
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