INVESTIGATION OF THE SOLAR ENERGY UTILIZATION FOR MEETING PART OF THE THERMAL DEMANDS OF AGRICULTURAL-PRODUCT MECHANICAL DRYERS
In this study a methodology for the determination of the fraction of thermal loads supplied by a solar energy system, employed for preheating air in a mechanical dryer, is presented. The basic parameters influencing the mechanical-dryer energy supply system under steady-state operating conditions are studied, and the analytical relationships between the energy quantities and the drying conditions are also determined. Therefore the thermal loads for drying raisins and figs at three different air temperatures are calculated. The energy to preheat the drying air is provided by a solar collector field, connected to a heat exchanger directly inserted into the airflow. Using the f-chart method, suitably applied and taking into account the appropriate designing parameters, the fraction of the dryer thermal loads covered by the solar energy system is determined on a daily basis. This investigation gives rise to the conclusion that for drying temperatures of 70÷75℃ (typical for grapes and figs) a significant fraction of the thermal loads of the mechanical dryer could be supplied by a solar system depending on the solar collecting area.
Stamatios Babalis Elias Papanikolaou Vasilios Belessiotis
Solar & Energy Systems Lab, NCSR “Demokritos 153 10 Ag.Paraskevi Attikis - Greece
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）