Renewable energy in agro-industrial complex: Wind power systems for heat production, storage and supply of green houses

The necessity of year-round supply of population by fresh vegetables accelerates the emergence and development of the green houses.

Green house is a building, designated for cultivation of plants (vegetables, fruits, flowers), which are sensitive to illumination. The light is a maim energy source for photosynthesis process, its parameters are taking into account in construction of green houses. The roof and the walls of the green house buildings are made of glass or transparent polymer film. Polymer film coverage can be one-sided or double-sided. In the second case, inter-films space is filled with air. Film provides maximum transmission of sunlight, particularly in the ultraviolet range of the optical spectrum. Greenhouse is heated by solar radiation that penetrates through the transparent roof and walls and is absorbed by the soil, plants and air. In the autumn-spring and winter periods with low solar irradiation in the green houses the electric lighting systems are used.

Necessary parameters of soil and air in the green house (illuminance, temperature and humidity) are provided using special technological processes and equipment. In particular, power system performs energy supply, necessary additional illuminance and control of greenhouse equipment. Hydraulic system includes water soluble components, system of disinfection, drop irrigation, moisturizing as well as tide system. It allows producing water solutions for each type of plants and maintaining the climate. Green house plant growing is energy intensive process. The cost of energy in the structure of the cost of products, depending on the type of crop is about 55%.

Energy saving strategy for growing plants in a closed soil is directed into reduction the consumption of energy carriers on a ton of product and implementation of non-conventional and renewable energy sources (Sun, wind, biogas) for the production of thermal and electrical energy. The part of the autonomous energy production and supply for greenhouse farms in total energy balance is growing constantly and for medium latitudes it is ~ 25 …35%. The employment of renewable energy allows 2…3 times to reduce external energy and to continue the season of plants cultivation, to raise crop yields and to expand the assortment of plants. But alternative energy sources have a number of shortcomings: occupy large areas, depend on the weather, time of day and season. Without a scientific approach the employment of alternative sources of energy today is less effective in comparison with traditional systems on the fossil fuel. Figure 4.35 shows principles and directions of the energy supply and energy-saving in the greenhouse farms.

 

 

By Vasil Sidorov on October 15, 2012

Technopark QUELTA, Queltanews from

Nizhyn Laboratories of Scanning Devices

sidorovvasil@gmail.com

 


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