Result and Discussion

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Bigadic geothermal sources are mainly utilized for district heating, although the source temperature is suitable for the absorption cooling. That is why in this study, geothermal energy-assisted absorption cooling and its environmental effects on global warming are investigated. It is known that electricity usage has an indirect effect on air pollution. For each kWh of electricity production, the power plants emit 315-915 g of CQ ; 0.04 and 3.15 g of SO2, respectively. Figure. 7.6 shows the potential of CO2, SO2, and NOx emissions reduction for a house in summer season.

Environmental benefits of the Bigadic GDHS for heating season are investigated and given as follows: (i) it is obtained that maximum heating demand for a total of 2200 dwellings is 15.25 MW and the energy savings achieved with this system amounts to 3876.24 tons of oil equivalent (TQE) per year (1 TQE is equal to 8, 000, 000 kcal); (ii) the amount of emissions of CO2 and SO2 are reduced drastically. If other fuels, namely coal, fuel oil, and electricity were used, the annual emissions of such gases would have been 29, 996/355.49, 11, 206/53.65, 136, 313/3097 tons/year, respectively. If the system worked with full capacity, the number of the equivalent of the dwelling would have increased from 2200 to 4593. When Bigadic geothermal district heating system reaches full capacity, a total of 8092.54 TQE/year energy will be saved (Oktay et al., 2007c ).

Cooling load for ATC in cooling season changes between 13,715 and 16,896 MWh when we consider a total of 2200 dwellings. The electrical energy saving achieved with absorption cooling system amounts to between 2112 and 5253 MWh. The amount of emissions of SO2, CO2, and NOx can be reduced drastically if the absorption cooling system is utilized. The reductions in CO2 emissions from coal, fuel oil, and natural gas-fired power plant are calculated to be 1933 and 4806; 1605 and 3992; and 689 and 1654 tons based on the average and best case scenarios, respectively.

O m 1000

25°C 20°C 21°C 22°C 23°C 24°C 25°C 20°C 21°C 22°C 23°C 24°C 25°C

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I SO2 value for ATC I SO2 value for MnTC

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I SO2 value for ATC I SO2 value for MnTC

1 SO2 value for MxTC ] NOx value for ATC

Natural gas

H NOx value for MxTC

Fig. 7.6 Reduced emission values for a house in summer season (a) for CO2, (b) SO2 and NOx at a 23°C indoor temperature.

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u MnTC

MxTC

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Coal

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NOx value for MnTC

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