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An exhaust gas recuperator is included that improves the efficiency of the system substantially. The machine is designed to run for a long time on full load and the extra investment that the recuperator requires is quickly saved. The recuperator is also especially beneficial due to the low pressure ratio of the T100. The difference in temperature after the compressor and after the turbine is large and the recuperator can then transfer large amounts of heat from the exhaust gas to the compressed air; see the regeneration section. There is also a gas/water heat exchanger, where water is heated by the exhaust gases coming from the recuperator. The hot gas has a heat potential that can deliver 167 kW at full load to the hot water system. With an electric efficiency of 30 % and the extra gas/water heat exchanger, the total efficiency is about 80 %! The water can then be used to heat buildings. In countries where heat is in abundance, an absorption chiller can replace the gas/water heat exchanger to provide air conditioning. This application will shortly be introduced in the T100 microturbine. A very important property of the T100 is its low emissions. The whole system is designed and optimized to minimize all harmful emissions. All the individual components are optimized for a certain speed or temperature where the losses are at a minimum and the efficiency at a maximum. The control system meticulously controls the speed and combustion temperature of the microturbine and keeps them constant to ensure stable and complete combustion with as low emissions as possible. The exhaust gases are actually so clean that the microturbine can be used inside green houses. In this application the T100 can supply power to the grid and heat to maintain the high temperature in the green house, while carbon dioxide in the exhaust gases are supplied to the plants as fertilizer to increase growth. In some green houses, gas boilers are used to provide the plants with heat and this extra carbon dioxide, but the demand of heat is lower than the demand of carbon dioxide so much heat is wasted. Instead some of this heat can be used to produce electricity by installing a T100 microturbine. Below a schematic figure of the thermodynamic stages of the T100 CHP is shown. As can be seen an extra heat exchanger is used to heat water with the hot exhaust gases coming out the recuperator. 1. Generator 2. Air inlet 3. Combustor 4. Air to recuperator 5. Compressor 6. Turbine 7. Recuperator 8. Exhaust gas to heat exchanger 9. Gas/Water heat exchanger Figure 6: Scheme of thermodynamic parts of the T100 microturbine, (Turbec AB) 13PDF Image | Modelling of Microturbine Systems
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