Big Size Garden Greenhouse Green Plastic Cover Grennhouse

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The picture of plastic cover for small greenhouse:

Thermal insulation performance of film greenhouses:

Film greenhouse is a new type of agricultural facility, which has the advantages of low investment, fast construction, high efficiency, high land utilization rate and easy management.

It has developed rapidly in recent years and has become one of the leading forms of facility agriculture in my country. However, there are some shortcomings in the operation of film greenhouses, such as low indoor temperatures in winter; high indoor temperatures in summer (especially in southern China); the greenhouse film is easily damaged; and poor lighting in the greenhouse affects production efficiency and production. benefit. This article discusses how to improve the thermal insulation of film greenhouses.

1. Performance of plastic film:

①Light transmittance: The light transmittance of a plastic film is the main factor affecting its thermal insulation.

②Thermal conductivity coefficient: That is, the speed of heat transfer per unit area or the ability to conduct heat is called the thermal conductivity coefficient or heat transfer resistance (k value).

③Air permeability: refers to the ratio of the amount of air passing through the gap of the material under a certain pressure to the amount of water of the same volume, which is called air permeability (or breathability).

④Heat storage: The amount of heat storage depends on the thermal conductivity and thickness of the material and other physical parameters, as well as the type and structural characteristics of the covering.

⑤Hygroscopicity and water vapor permeability: The ability of a material to absorb moisture is called hygroscopicity or hygroscopicity, while the water vapor permeability of a material is called water vapor permeability or transpiration intensity.

⑥Surface tension.

⑦Weather resistance.

⑧Mechanical strength.

2. Intrinsic factors affecting the thermal insulation performance of plastic films:

Material properties:

Polyethylene PE:

Polyethylene is a colorless, transparent, odorless, tasteless and non-toxic plastic resin polymer with a melting point of about 130-140°C, a relative density of 0, 91-0, and 94gcm3, and a glass transition temperature of about 80-90°C. ; Due to its small intermolecular force and good molecular chain flexibility, it has low melt viscosity and good fluidity, making it one of the excellent agricultural mulching materials.

A.plastic cover for small greenhouse Outside Shading System, Inside Shading System.

1) Internal shadow: setting internal shadow is an effective way to save energy, shadow, temperature and humidity. The unique advantage of sunshade is that it will reflect sunlight rather than absorb sunlight, effectively reducing the greenhouse lighting, while reducing the temperature of crops and air. The unique heat radiation barrier material emitted outside the greenhouse can make the curtain not lose heat. Closing the blinds will quickly increase the indoor humidity, at the same time, the shading radiation on the lower surface will also spread from the greenhouse, which has a good absorption capacity, and the curtains can keep high temperature. High temperature curtain can prevent condensation and avoid the surface of condensation water under the curtain.

2) Outdoor sunshade: in summer, the heat load of solar radiation is too high. When using the external sunshade system, due to good ventilation, the indoor temperature can only be controlled at 1 ° C higher than the outdoor room in the well ventilated greenhouse, and most of the solar radiation enters the greenhouse. If combined with the wet curtain fan system, it can create an ideal temperature and humidity environment, reduce the operating cost of greenhouse and save energy consumption.

B. Plastic cover of seedling bed system in small greenhouse

Greenhouse seedbed system includes fixed seedbed and mobile seedbed. The fixed seedbed is single-layer with angel steel as support and steel mesh fixed on the surface. The support of mobile seedbed is made of galvanized steel pipe, which is the outline of seedbed aluminum alloy material. The surface of the mesh is protected from corrosion by a covering layer. Seed bed system can effectively improve the utilization rate of greenhouse, which can reach about 85%

C. Distribution system

Greenhouse control system is an environmental automatic control system designed for agricultural greenhouse, agricultural environmental control and weather observation. It can measure many agricultural factors, such as wind direction and wind speed, air or soil temperature and humidity, air pressure, rainfall, solar radiation and ultraviolet intensity. It can control the ventilation system, shading system, cooling system, lighting supply, irrigation and fertilization facilities to adjust the internal environment of the greenhouse to the most appropriate conditions.

We attach importance to management innovation, strengthening quality management and site management to ensure that we provide quality Big Size Garden Greenhouse Green Plastic Cover Grennhouse to our customers. Our company has been committed to improving more competitive products and services to customers with mature technology, stable quality, excellent service and low prices. Our success is based on the development and interactive use of multiple excellent technology platforms to meet the needs of customers in a wide range of market areas in the real world.