Specific heat capacity of wildland foliar fuels to 434 °C

FUEL

卷:292

Article

Boardman, Charles R.¹  Dietenberger, Mark A.¹  Weise, David R.² 

[1] US Forest Serv, Bldg & Fire Sci, Forest Prod Lab, USDA, Madison, WI 53726 USA

[2] US Forest Serv, Fire & Fuels Program, PSW Res Stn, USDA, Riverside, CA 92507 USA

关键词: Heat capacity;    Fire modeling;    Pyrolysis;    Differential scanning calorimetry;    Thermal analysis;    Foliar fuels;   

DOI  :  10.1016/j.fuel.2021.120396

来源: Elsevier

【 摘 要 】

Specific heat capacity of eleven live foliar fuels from the southeastern United States was measured to 434 degrees C using differential scanning calorimetry to improve the modeling of prescribed fire behavior. Techniques which allow measurement of the standard heat capacity, excluding the effects of heat of reaction, were refined. Specific heat of leaves increased with temperature until the onset of pyrolysis. Once pyrolysis began, the specific heat became nearly constant. We present a simple model, suitable for incorporation in computer simulations, which captures this functional shape. This model approach could be applied to other foliar fuels if the chemical composition is known. Measurement of standard heat capacity was used to estimate effective heat of reaction given the measurements of total heat flow which included heat of reaction. For all foliar fuels studied, effective heat of reaction was found to be mildly exothermic between 220 and 350 degrees C.

【 授权许可】

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