greenhouse and how it works

The greenhouse is a special facility that uses transparent covering materials and environmental control equipment to form a local microclimate, which is conducive to the growth and development of crops. The role of the greenhouse is to create suitable environmental conditions for the growth and development of crops and to achieve high-efficiency production. After the solar radiation dominated by short-wave radiation enters the greenhouse through the light-transmitting material, it is converted into long-wave radiation due to the increase of indoor temperature, and is blocked by the greenhouse covering material, thereby forming indoor heat accumulation and increasing the indoor temperature. This process Called the "greenhouse effect".

The greenhouse is our use of the "greenhouse effect". In the season when crops are not suitable for open field growth, the government can continuously create a suitable social environment for crop growth by regulating the indoor design temperature to achieve crop production and increase crop production in China. But with the advancement of information science management technology, greenhouse production has far exceeded the concept of "greenhouse effect". At present, the use of these high-tech enterprise technologies can analyze and automatically control and adjust various environmental protection factors in the greenhouse, including temperature, light, humidity, CO2 concentration, etc., according to the growth habits of the company’s crops and the needs of the market. , Did not even completely get rid of the constraints of the natural ecological environment, to create conditions suitable for the growth of crops suitable for learning environment, produce high-quality, high-yield products to meet the needs of different cultural consumer groups of students

2. Types of greenhouses

Generally, according to the production of light-transmitting cover material greenhouse greenhouse, the characteristics of structural materials, and the main greenhouses are classified.

1. According to my country's greenhouse light-transmitting covering materials can be classified

(1) A greenhouse with glass as the main transparent covering material. A greenhouse covered by a single glass is called a single glass greenhouse, and a greenhouse covered by a double glass is called a double hollow glass greenhouse.

(2) Plastic greenhouse

All greenhouses covered by transparent plastic materials are collectively referred to as plastic greenhouses. According to the nature of plastic materials, plastic greenhouses are divided into plastic film greenhouses and rigid plate plastic greenhouses. Plastic film greenhouses are divided into small and medium arched greenhouses, plastic greenhouses and large plastic film greenhouses (usually called plastic film greenhouses or plastic greenhouses) according to the size of the greenhouse. In order to improve the thermal insulation of plastic film greenhouses, double-layer plastic films are often used to cover the greenhouse. The double-layer plastic film is called a double-layer structure plastic greenhouse, and the double-layer plastic film is called a double-layer inflatable greenhouse.

Plastic greenhouses are divided into different greenhouses according to rigid fiberboard sheets. Polycarbonate panels (hollow panels include polycarbonate and polycarbonate greenhouse wave plates), FRP (glass fiber reinforced polyester sheets including glass fiber reinforced acrylic resins) Plate) greenhouse. Note that if a single material does not cover the light-transmitting material of the greenhouse, but consists of two or more covering materials, the roof of the greenhouse should be made of a translucent light-transmitting material for combining the material with the light-transmitting material. The maximum coverage of the roofing material is for the final material foundation.

All load-bearing structures are greenhouses made of aluminum alloy profiles. The roof load-bearing components are aluminum alloy profiles, and the steel structure greenhouses such as beams, trusses, and columns are still steel structure greenhouses.

2. Classification according to the performance of my country's greenhouses

(1) Plastic shed

For a single-building plastic greenhouse, the transparent cover plastic film material of the plastic greenhouse is one of the simplest greenhouses, and it is also the largest number of types of greenhouse ownership in my country.

2) Sunlight greenhouse

It is a development greenhouse with thermal insulation material walls on three sides, east, west and south, and curved lighting surfaces in the south. The biggest advantage of this type of greenhouse is its good heat preservation performance. At present, the greenhouse type that has the most existing resources in the rural areas of northern and northeastern my country is the greenhouse style.

(3) Multi-span greenhouse

A greenhouse is a greenhouse connected to a single-span greenhouse. According to the roof form, the greenhouse is divided into a pointed greenhouse, a round arch greenhouse, a sawtooth roof greenhouse, a flat roof greenhouse, and a model roof greenhouse. The biggest advantage of continuous greenhouse is large indoor space, high space utilization rate and high degree of mechanization. It is currently the most widely used greenhouse style in developed countries, and it is also the future development direction of my country's greenhouses.