Solar Energy Case Study

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Table 11: Solar energy collector type (Source: Kalogirou (2004))
In the textile industry, energy is mainly consumed for heating of liquid baths close to 100 oC for washing, bleaching and dyeing. Drying processes usually use hot air or gases from 100 to 130 oC as shown in Table 12. In a solar process heat system, interfacing of the collectors with conventional energy supplies must be done in a way compatible with the process. The easiest way to make this is by using heat storage, which can also allow the system to work in periods of low irradiation.
Table 12: Process temperatures in Textile industry. (Source: Kalogirou (2002))
At the Kombolcha Textile Share Company exists a central system for heat supply that uses steam at a pressure
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The financial benefits are the difference in unit cost of useful thermal energy of the fossil fuels and that of the substitute biomass fuels. To displace one liter of fuel oil, 3−4kg of biomass fuel will be required or an ETC solar collector area of 0.003 m2 will be required.
Reduced cost of fuel:
Taking the Kombolcha case as an example, 100% fuel oil replacement would represent 47t of biomass fuel per day. Assuming the average cost of biomass briquettes to be 108US$/t, the total year biomass fuels cost would, therefore, be approximately US$ 5,030. The price of furnace oil fluctuates. At 0.85US$/l, the cost of 100% of the daily consumption of furnace oil for Kombolcha textile factory is approximately US$ 9,500 resulting in a 47% saving on fuel cost.
Revenue from CDM:
Taking the Kombolcha case as an example, 100% fuel oil replacement would represent 47t of biomass fuel per day. Assuming the average cost of biomass briquettes to be 108US$/t, the total year biomass fuels cost would, therefore, be approximately US$ 5,030. The price of furnace oil fluctuates. At 0.85US$/l, the cost of 100% of the daily consumption of furnace oil for Kombolcha textile factory is approximately US$ 9,500 resulting in a 47% saving on fuel

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