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EFFECTIVE SPECIFIC HEAT OF WOOD BRIQUETTES

机译：木块的有效比热

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The effective specific heat of wood briquettes was determined by using a mathematical model developed for bulk pellets/briquettes and by measurements made in parallel and perpendicularly to the briquettes axis in the range of moisture contents below and above equilibrium moisture content. The mathematical model was based on the assumption that bulk pellets/briquettes are a porous system, consisting of solid particles and gas, with effective thermal properties. The model applied to the briquettes with the moisture content above the equilibrium moisture content is different to that applied to the briquettes with the moisture content below equilibrium moisture content, since alongside with wood fiber swelling, the magnitude and the number in the voids between chips increases. That is why, the briquettes density decreased in this moisture content range. New equations are proposed for this moisture content range considering a larger wood cell lumen that includes the chips interspaces. Experiments were performed at the temperature of briquettes ranging from 19 to 24oC and the average moisture content from 0 to 22.7%, dry basis. When increasing the moisture content above equilibrium moisture content, the briquettes expanded due to fiber swelling, but also due to the increase in the magnitude and number of chips interspaces. Both swelling and increase in briquettes voids influenced the effective specific heat.
机译：木质团块的有效比热是通过使用为散装团块/团块开发的数学模型，并通过在低于平衡水分含量和高于平衡水分含量的范围内平行且垂直于团块轴进行测量而确定的。该数学模型基于以下假设：散装小球/团块是一个具有有效热特性的，由固体颗粒和气体组成的多孔系统。应用于水分含量高于平衡水分含量的煤球的模型不同于应用于水分含量低于平衡水分含量的煤球的模型，因为随着木纤维膨胀，木片之间空隙的数量和数量增加了。因此，在该含水率范围内，团块密度降低。考虑到包括切屑间隙的更大的木质细胞腔，提出了针对该水分含量范围的新方程。实验是在团块温度为19至24oC，平均水分含量为0至22.7％（干基）的条件下进行的。当将水分含量增加到高于平衡水分含量时，由于纤维膨胀，而且由于切屑间隙的数量和数量的增加，团块膨胀。煤球空隙的膨胀和增加都会影响有效比热。

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    《Pro Ligno》 |2017年第4期|共9页
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    Daniela SOVA;

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