太阳能相变储热在木材干燥中应用的初步研究

A Preliminary Study on Solar Latent Heat Storage in Wood Drying

针对木材太阳能干燥间歇性的不足,在原有太阳能干燥装置的基础上,增设了多管道叉排石蜡相变储热系统。研究结果表明,随着储热系统管排数的增加(5、7、9、11排),其放热时间逐渐缩短,换热系数呈现增加趋势,平均值分别为17.8、22.1、24.7、26.4W/(m2.℃);在其它参数相同的条件下,当管排数不大于5时,储热温度对换热系数的影响不大,但当管排数大于11,储热系统显热储存的热量就不能够忽略;在其它参数相同的条件下,随着风速的增加,换热系数呈现增长趋势,风速为1.0、1.5和2.0m/s时,放热速率的比值为0.89∶0.94∶1。

A paraffin latent heat storage system with multi-pipe fork rows was added to the original solar drying equipment for the intermittence of drying wood using solar energy. The result shows that the exothermal time was gradually shortened with the increase of the pipe rows （ 5, 7, 9, 11 ） of the storage system, the heat transfer coefficient rose, its average value was 17.8, 22.1, 24.7, 26.4W/（m^2 ·℃ ） respectively. Under the condition that the other parameters were the same, when the pipe row number was not more than 5, the influence of the temperature of latent heat on the heat transfer coefficient was not high; when the pipe row number was more than 11, the heat amount of sensible heat in the heat storage system should not be neglected. Under the condition that the other parameters were the same, the heat transfer coefficient rose with the increase of wind speed, when the wind speed was 1.0, 1.5, and 2.0m/s, the exothermal rate ratio was 0.89： 0.94： 1.