在气干和炉干作业中通常都利用少量太阳热。气干场的道路和地面上,也像板垛一样由于太阳照射变热。虽然这些场所所吸收的热也传送到干燥场的空气中,但许多系在空中幅射失去。干燥窑的屋顶和墙也为太阳照射变热,这一部分热绝大多数也由于在空气中幅射失去,因此太阳热对炉干作用并不很大。干燥锯材时利用太阳热,必须不放走所吸收的热。一个方法是在太阳和受热物件之间放一块透明的薄片或薄膜。透明的薄片完全不挡阻日光的行道,但是从 A small amount of solar heat is usually used in both air-dry and oven-dry operations. Air-dry field on the road and the ground, but also as the same as the plate stack due to solar radiation heating. Although the heat absorbed by these sites is also transmitted to the air in the drying field, many are lost in aerial radiation. The roofs and walls of the drying kilns are also heated by the sun’s rays. Most of this heat is also lost due to radiation in the air, so the solar heat has little effect on the heats. Use of solar heat when drying sawn timber, must not let go of the absorbed heat. One way is to place a transparent sheet or film between the sun and the heated object. Transparent sheet does not block the sun’s road, but from