Renewable energy in agro-industrial complex: Parameters of the wind power systems for heat production, storage and supply of green houses. Part 2

Table 4.2 lists the parameters of wind and traditional systems for heat supply on the organic fuel of various capacity, designed for the following initial data: area of the greenhouses is 10000…100000 m2; specific heat losses in the greenhouses are 200 W/m2; the specific power of electric system of additional illumination of plants – 100 W/m2; the average daily duration of the wind is 10 hours; the duration of the cold season is 6 months; average wind speed for a given region is 7 m/s; energy conversion efficiency of wind power system – 0,9; specific heat capacity of coolant (water) is 4,2 kJ/(kg x K); working temperature mode of operation for thermal storage unit – 200C…700C…200C; energy conversion efficiency of boiler on the organic fuel is 0.9; specific heat of combustion for fossil fuel (natural gas) is 32,7 MJ/m3.

Figures 4.38,a,b illustrate heat losses versus area of green house buildings accordingly during a day and a heating season. Figure 4.38,c shows intensity of heat losses versus area of green house buildings.

Figure 4.38,d shows power of the wind power systems for heat supply and traditional heat only boiler stations on natural gas versus area of green house buildings with average wind duration of 10 hours per day. To heat area of 10000…100000 m2 of green house the necessary area of wind flow cross section is changed according to fig. 4.39,a at wind duration 10 hours per day. A quantity of wind turbines in the wind power station for heat supply is determined by the power of separate turbines and total power of wind power plant. Figure 4.39,b illustrates the number of 4,8 люW wind turbines in a WPP versus area of green house with average wind duration of 10 hours per day.

The necessary heat capacity of accumulator is determined by specific heat capacity of coolant and heat losses in green house. Figure 4.40,a shows necessary heat capacity of thermal storage unit versus area of green house. Wind power systems lower the use of fossil fuel and restrict greenhouse gases emissions into the environment. Figure 4.40,b illustrates the water thermal accumulator volume of WPP versus area of green house.

 

 

By Vasil Sidorov on October 15, 2012

Technopark QUELTA, Queltanews from

Nizhyn Laboratories of Scanning Devices

sidorovvasil@gmail.com


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