| 摘要 |
Evaporative cooling from Luffa Egyptiaca. There is huge demand for filters for desert coolers and pads for evaporative cooling for various industrial and agricultural purposes. Extensive studying and testing have shown that Luffa have excellent potential for use as evaporative medium. And since they are a very cheap raw material, it promises to be very competitive compared to other alternatives (aspen, or impregnated paper). Properties: Luffas are very durable material when dealing with water and can withstand water for a very long time. Also when immersed in water and taken out they retain a considerable amount of water for sometime which means they can be of use for evaporative cooling. Moreover when wetted or moistened they become soft and can be pressed, moulded and shaped in many forms. However, Luffas have a drawback compared to other materials used as media. Because they do not absorb water, the water does not spread within them easily. Filter: The Luffas are pressed mechanichally or are power-pressed in moulds in layes ot the required size. They are of course wrapped in nylon mesh as other media. Pads: The pads are formed of an external and internal filter. Sandwitched inbetween are loose cuttins of Luffa to allow the right aire velocity to pass through. The sizes produced are 80.100.150 m m thick pads, which give saturation efficiencies of well over 80 %. Moreover they provide humidities of almost up to 100 % which is needed in a number of usages. |
