Tomato Strawberry Double Layer Poly Greenhouse Multi Span Large Size Arch Shape

Large Size Multi-span Arch Plastic Film Greenhouse Tomato Greenhouse And Strawberry Greenhouse

Introduction

saw-tooth greenhouse

The zigzag greenhouse can be divided into 3 types according to the shape of the roof. Due to the large ventilation area, the natural ventilation effect of the zigzag greenhouse is generally better than that of the arched dome greenhouse. According to the determination, the natural ventilation effect of this greenhouse is matched with the external shading. The temperature difference between indoor and outdoor can basically reach 1 ~ 3 ° ℃. However, the sealing effect of this kind of greenhouse skylight is often poor, and it has good economic benefits to promote it in the southern regions where the summer temperature is high in China and the winter temperature is not very low, but it is not suitable in areas with hot summers and cold winters. When choosing to use a zigzag greenhouse, special attention should be paid to the prevailing local wind, so that the ventilation openings of the greenhouse are located in the downwind direction to form a large negative pressure ventilation and avoid cold wind reverse irrigation.

Double-layer inflatable greenhouse

The double-layer inflatable greenhouse is almost the same as the traditional plastic film greenhouse except that the covering material is a double-layer inflatable membrane. Due to the double-layer inflatable film covering, the thermal insulation performance of the greenhouse has been increased by more than 30%, but at the same time the light transmittance of the greenhouse has also decreased by about 10%. It has good economic benefits in northern areas with sufficient sunlight and low winter temperatures in China. However, it is difficult to make up for the energy saving effect of double-layer inflation due to insufficient winter light and high temperatures due to the lack of sunlight in winter and high temperatures. The loss caused by it is generally not suitable. In the use of double-layer inflatable greenhouse, if two layers of film air are filled from the room, although the inflation temperature is high, because the indoor air is often accompanied by high temperature and humidity, this air is filled into the film room and the outer film is cooled. Condensation is easy to occur, and the dew drops will stay between the two layers. Over time, water bubbles will form between the membranes, causing the inner layer of the membrane to be locally stressed and damaged. In order to reduce the accumulation of such dew drops, it is generally required to install the suction port of the inflatable fan outdoors, because the relative humidity of outdoor air is lower than that of indoor air.

Double-layer greenhouse

The purpose of the double-layer greenhouse is also to obtain the energy-saving effect of the double-layer inflatable greenhouse, but double-layer bone is used in the structure treatment.