Chemical Raw Materials Factory Prices PVC Resin Sg3/Sg5/Sg7/Sg8

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Commercial greenhouse plastic is unheated single span arched roof greenhouse, with commercial greenhouse plastic as covering material. Commercial greenhouse plastic greenhouse is easy to build, easy to use and low investment. They are simple protected planting facilities. With the development of plastic industry, it has been widely used in the world. Plastic greenhouses usually do not rely on indoor heating, but rely on the greenhouse effect to accumulate heat. The lowest temperature is generally 1-2 ℃ higher than the outdoor temperature, and the average temperature is 3-10 ℃. The light transmittance of plastic greenhouse is generally 60% - 75%. In order to ensure the basic balance of the average light throughout the day, the layout of greenhouses is mostly extended from north to south.

Greenhouse construction includes site selection, greenhouse structural design, placement and layout of greenhouse ancillary facilities, etc. This article takes the construction facilities required for each function of the greenhouse as a basic outline and discusses in detail the key points that need to be paid attention to for each function of the greenhouse. Functional facilities.

1. Greenhouse site selection

It is generally better to build a greenhouse in a place with a quiet environment, sufficient sunshine, abundant water resources, and cleanliness, which can provide excellent and convenient conditions for later breeding. The surrounding drainage ditches are well constructed and there is no risk of waterlogging. The water around the greenhouse can drain away by itself. Water sources are easily available and there is no dry season, which can fully meet the water needs of greenhouse turtles. It is best for the water source to comply with the "Fishery Water Quality Standards", and there must be no breeding bases or highly polluting enterprises discharging wastewater upstream of the water source.

2. Greenhouse structure design

①Greenhouse layout

The area of each greenhouse should be within 800 square meters, and the width of the greenhouse should be within 20 meters, preferably running in the north-south direction. The height of the gable in the greenhouse is 2.2 meters, and the height of the walls on both sides is about 0.6 to 0.8 meters. The greenhouse is designed with two rows of ponds, with a channel and drainage ditch in the middle, and an escape-proof fence at the outlet of the drainage outlet. Each pool is preferably 24 to 35 square meters, preferably a single-layer pool, which can effectively control the temperature of the entire greenhouse pool. It is recommended that a greenhouse inlet water temperature regulating pool be built in the greenhouse, which can be used for emergency water use. The greenhouse single pond structure has high surroundings and low drainage outlets, forming a funnel-shaped pond structure. A special reminder here is that it is best to make the surface of the pond smooth, smooth the bottom and walls of the pond with high-grade cement, and install an anti-escape net at the drainage outlet. When building a greenhouse, the land should be leveled. It is best to raise the greenhouse land a little higher. The drainage ditch in front of the greenhouse door should be clear and no backflow into the greenhouse drainage ditch is allowed.

②Insulation and heating

Insulation materials should be sandwiched between the exterior walls of the greenhouse, and the thickness of the insulation board should not be less than 0.5 cm. Greenhouse roofs feature multiple layers of good insulation. From bottom to top they are film, insulation board, straw, and film. Since different materials are used in different regions, the insulation requirements are the same. As long as it can cooperate with the heating system, the water temperature in the shed can be controlled at 28℃~30℃.

③Ventilation facilities

Greenhouse breeding is in a relatively closed environment, and the concentration of harmful gases in the greenhouse is easily too high. In summer, greenhouses are particularly prone to extremely high temperatures due to direct sunlight, so ventilation is necessary. When ventilation facilities are not in use, they can be sealed with insulation materials. The general ventilation facility is to install a wall fan on the back wall of the greenhouse to adjust the opening and closing of the double doors inside and outside the greenhouse to control the flow rate of air in the greenhouse and regulate humidity and air quality. and the temperature inside the greenhouse.

④Oxygenation facilities

Each greenhouse is equipped with a sufficiently powerful aerator that is placed outdoors (a separate shed can be built for it). The area where the aerator is placed must be dry and dust-free. It is best not to expose the air outlet of the aerator directly to the air. A windshield can be installed at the front. The main aeration pipeline is laid to each pool using PVC pipes. Each pool is arranged according to the standard of one sand head of 3 square meters. These aeration sand heads are fixed by bundling so that the oxygen density and arrangement are always consistent. The sand head is placed 3 to 5 cm away from the bottom of the pool, and the dissolved oxygen in each pool is regularly tested to ensure that the dissolved oxygen in the pool water remains above 3mg/L for 24 hours.

How to extend the service life of a greenhouse?

Over time, blisters form between the membranes, causing local stress and damaging the intima. In order to reduce this condensation, because the relative humidity of the outdoor air is lower than that of the indoor air, it is usually necessary to install the suction inlet of the inflatable fan outdoors.

The frame supporting two layers of film respectively eliminates the inflatable fan between two layers of film. The utility model has the advantages of saving the operation cost of the aerated gas, avoiding the condensation between the double-layer aerated membranes, and using the film ventilation air to open or close the two-layer membranes respectively. The film can optimize the management of greenhouse in energy saving and lighting, further reduce the energy consumption of greenhouse and save the cost. It is especially suitable for use in areas with insufficient light in South China.

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