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《China Forestry Science and Technology》 2012-01
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Exergy loss analysis of conventional lumber dry kiln in different heating conditions

ZHANG Bi-guang,GAN Xue-fei,YI Song-lin College of Material Science and Technology,Beijing Forestry University,Beijing 100083,China  
Exergy loss of conventional lumber dry kiln in different heating conditions was analyzed.When the steam-coil-heating temperature was constant,lower dry kiln temperature would lead to greater heat transfer temperature difference,meaning more exergy losses.When the temperature of dry kiln and steam coil surface was constant,higher steam-coil-heating temperature would result in greater heat transfer temperature difference and more the exergy losses.The heat transfer temperature difference had a great influence on exergy loss.When the heat-supply temperature was 110℃,the reduction of heat transfer temperature difference from 40℃ to 30℃,20℃ or 10℃ would lead to 46.08%,77.01%,or 94.48% decrease of exergy loss,respectively.Therefore,the heating temperature difference should be reduced as much as possible as long as it meets the need of dry kiln to reduce exergy losses.Exergy loss caused by pressure difference increases with the increase of pressure difference,and was greater in high pressure condition than in low pressure condition.Exergy loss due to differential pressure flow was 1 to 2 orders bigger than that due to temperature difference.Therefore,when the dry kiln is heated by a boiler,throttling should be avoided as much as possible.
【Fund】: 教育部新世纪优秀人才支持计划项目(编号:NCET-08-0729)
【CateGory Index】: TS652
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