水膜系統應用於消防工程上，往往能有效防阻火災延燒與提升建築物防火構件防火阻熱性能；為了有效透析水膜系統於提升防火阻熱性能的效能，防火構件於火場中的曝火面熱傳特性必須為已知條件。然而，火場伴隨的高溫與強烈熱輻射，使得防火構件的曝火面熱傳特性難以透過現有量測工具獲知。因此，本研究將結合拉式轉換、中央差分法、最小平方法之混合逆算熱傳法，配合非曝火面實驗數據求解二維暫態逆向熱傳導問題，以預測防火構件之曝火面熱傳特性。並採用不含有防火阻熱性能之玻璃板、鐵捲門與布幕等三種防火構件建材進行探討，以期獲得三種防火構件建材表面是否含有水膜時的曝火面熱傳特性。
研究結果顯示，水膜附著於三種防火構件建材表面時，由於水本身具有高蒸發潛熱與高蒸發顯熱，使得水膜於建材表面蒸發時，能夠維持建材表面平均溫度大約低於水的沸點溫度，由於水的沸點溫度低於建材燃點溫度，所以此水膜得以有效提升防火構件建材的阻熱性能。

Water film flows are an effective means of inhibiting the spread of fire. To investigate the effectiveness of water film flows, the unknown heat transfer characteristics must be known on both surfaces of the fireproof material. However, due to the extreme heat, measuring the temperature on the hot surface is problematic. Consequently, in the present study, the unknown surface heat flux, surface temperature, and overall heat-transfer coefficient are computed using a hybrid inverse heat conduction scheme comprising the Laplace transform and finite difference methods with a sequential-in-time concept and the least squares method based on the experimental temperature measurements obtained on the cold surface. The proposed method is applied to investigate the heat transfer characteristics of three different materials with and without a water film flow, namely a glass pane, a steel roller door, and a curtain.
Generally, the results show that for each material, the use of a water film flow yields a significant improvement in the heat resistance on both the hot and cold surfaces due to an enhanced latent and sensible heat transfer. Specifically, the water film lowers the average surface temperature due to the effects of water evaporation.

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