H2-FH18A n eupex 110 Helical gear Reduction Box H2

Flender/Flender Gear Units/Helical gear Reduction Box H2

ay be xed to the drying bin in such way that an air space exists between it and the bin wall. Energy absorbed by the collector heats the ventilating air by few degrees as it is forced through the air space. In North America, these typesof dryers have been known to operate satisfactorily with grain moisture contents up to2%, even on cloudy days (. The reason for this is that solar energy is about half visiblelight and half infrared rays, the latter being able to penetrate clouds. On rainy days andnights supplemental heat may be supplied electrically. In countries where harvesting time occurs at the beginning of the dry season, the most popular method of drying is exposure to the sun. Crops are often left to dry in theeld before harvesting. In some countries various crops are dried on scaffolds or invertedlatticework cones. Another method is to lay paddy, maize, cobs, and other crops on heapsof stubble and then to cover them with stubble. At the village level, probably the mostcommon practice is to spread the harvested threshed or shelled crop on the ground or ona specially prepared area (.., matting, sacking, mud/cow dung mixture, or concrete) exposed to the sun. In humid countries, initial crop drying may take place as just outlined; however, further drying is accomplished by placing the crop in ventilating storage area. moreeffective type of drying than sun drying is shallow layer drying. This form of drying maybe achieved by spreading the produce in layer on the ground or on wire bottom trays 1 Raghavan that are supported above the ground. Cribs may also be constructed for drying maize on the cob or unthreshed legumes and cereals. These are usually oriented so that the longaxis is facing the prevailing wind. They often have roofs or wide overhangs to protectthe drying crop from rain. In most warm countries, commercial dryer is too expensive and not essential enough for single farmer to consider its purchase. China, India, and countries on the continent of