| 摘要 |
FIELD: agriculture. SUBSTANCE: hothouse has a framework with a shed-type principal and roofing with chutes, ridges, and air-vents. The air-vents of each roof pitch run across the entire width of the pitch, and they are mounted in the middle on a driven shaft. The lower edge of each air-vent rests on a chute, and the upper edge is pressed against the ridge inside the hothouse. The quantity of sheds depends on the air vent width and span of the hothouse. EFFECT: higher efficiency of ventilation system; lower operating cost in winter. 3 cl, 1 dwg |
