الفهرس | Only 14 pages are availabe for public view |
Abstract ABSTRACT The gas turbine cycle is being extensively used for power generation across the world. Power generation with higher efficiency and lower capital costs is highly needed. Nowadays, global warming and climate change have become vital issues, prompting investigations into the effects of changing climate conditions, temperature, humidity, and pressure on the performance of the gas turbine. The change in temperature, humidity, and pressure of atmospheric air significantly affects the power generated by gas turbines. The present work introduces an energy and exergy analysis of gas turbine. Furthermore, economic analysis is presented for its hybrid cooling system. The studied parameters are; polytropic efficiency, pressure ratio, inlet temperature, and inlet relative humidity. Energy, exergy and economic (3E) analysis of the gas turbine is performed using the EES code V9.498-3D. The results demonstrate the parameter effect on the performance, the 1st and 2nd law efficiency, the exergy, and the exergy destruction ratio of the gas turbine and its components. These results include two cases. The first case is the specific condition that is based on the performance per unit mass. The second case is presented here as a new criterion based on density ratio (actual humid air density to dry air density at standard temperature).The results show that this criterion is more realistic than conventional special cases. A new type of compressor, combustion chamber, turbine, and gas turbine map are herein introduced. Furthermore, the present results demonstrate that the first and second law efficiency give quantitative and qualitative map pictures. In the present study, a new solution was introduced to operate the gas turbine in hot climates at its standard temperature, which is a hybrid cooling system (evaporative air cooling and absorption chiller). Economic analysis is ABSTRACT III achieved on the basis of comparing the hybrid system with evaporative air cooling and absorption chillers. The cost of the cooling system is calculated as a percentage of the gas turbine’s cost. The payback period, cost ratio, and energy saving cost ratio are demonstrated in the economic analysis. This analysis illustrated that an absorption chiller has a high initial capital cost and a long payback period when compared with evaporative cooling. On the other hand, absorption chiller can control air temperature to a specified inlet temperature and is not influenced by ambient conditions. Low RH and temperature climatic conditions have been shown to be more effective for evaporative cooling. The present hybrid cooling system reduces the back-period cost if it uses a chiller system. Adding an evaporative cooling system before the chilling system reflects on the downsizing of the chilling system. It means low initial capital investment costs and low total annual costs. |