日本和歌山县农业试验场最近研究出一种叫做“流下层”的新型节能大棚。它是钢管结构拱圆型塑料大棚。在大棚脊部装置一根直径40mm聚乙烯管子,管道上海隔50Cm留有一个管咀,用它连接拱架钢管。大棚用塑料板覆盖,室内装有塑料薄膜窗帘(白天拉开,晚上封闭)。夜间,室内温度降低用水泵将井水汲入聚乙烯主管道,水从主管道分别流入拱架水管,水流下之后汇入排水沟流走(参见示意图)。当注入水之后整个大棚 Japan Wakayama Agricultural Experimental Field recently developed a new type of energy-saving greenhouses called “flow below”. It is a steel pipe arch round plastic greenhouse. In the greenhouse ridge a 40mm diameter polyethylene pipe, the pipe leaving a nozzle 50Cm Shanghai Tsui, with it to connect the steel pipe arch. Greenhouses covered with plastic sheeting, indoor with plastic film curtains (opened during the day and closed at night). In the evening, the indoor temperature is reduced. Pumping the well water into the main polyethylene pipe, the water flows from the main pipe into the arch pipe, and flows into the drain after the water flows down (see diagram). When injected into the water after the whole greenhouse