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首頁  美国 ASTM C518穩態熱傳導性能測試/導熱係數檢測 |
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ASTM C518穩態熱傳導性能測試/導熱係數檢測
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標準：ASTM C518–用熱流量計裝置測定穩態熱傳遞特性的標準試驗方法
範圍：本測試適用於各種材料。
適用產品：保溫材料、建築材料、窗戶材料
測試程式：本測試使用熱流量計裝置（HFM）。熱流量計由一塊冷板和一塊熱板組成，熱板上裝有熱通量感測器，用於測量熱流。待測量的材料被放置在兩個板之間，這兩個板被控制到不同的溫度，以產生從熱板到冷板的熱流，該熱流由感測器測量。該裝置針對已知導熱率的材料進行校準，可用於測量厚度和導電率範圍較廣的扁平材料。測試通常在35oF至110oF的平均溫度下進行，最常見的是75oF。通常使用40oF–50oF的溫差。
最終結果：確定了熱導率（k值）和熱阻（R值）。這些值可用於確定材料的能量損失。該測試可用於滿足絕緣材料的R值規定，如美國聯邦貿易委員會的“R值規則”（10 CFR 460）。
特別注意：該方法通常可以用作ASTM C177的替代品，ASTM C177使用一種稱為防護熱板裝置（GHP）的不同裝置測定相同的性能。
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).
更多關於ASTM C518穩態熱傳導性能測試/導熱係數檢測，請諮詢南京睿督公司
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來源：防火網 發布時間：2/23/2023 點擊次數：220
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