Finite-time heat-transfer analysis and ecological optimization of an endoreversible and regenerative gas-turbine power-cycle |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi 110025, India;2. Mechanical and Automation Engineering Department, Amity School of Engineering and Technology, New Delhi 110061, India;1. Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai City 200240, China;2. China North Engine Research Institute, Datong 037036, China;1. Universidad Autónoma Metropolitana Iztapalapa, Dep. Process Engineering and Hydraulics, San Rafael Atlixco 186, Iztapalapa 09340, México D.F., Mexico;2. Universidad Nacional Autónoma de México, Instituto de Energías Renovables, Privada Xochicalco S/N, Temixco, Morelos 62580, Mexico;3. Comisión Nacional de Seguridad Nuclear y Salvaguardias, Doctor Barragán 779, Col. Narvarte, México D.F. 03020, Mexico |
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| Abstract: | This paper deals with the application of finite-time heat-transfer theory to optimize ecologically the power output of an endoreversible and regenerative gas-turbine power-cycle for infinite thermal-capacitance rates to and from the reservoirs. The expressions for power, thermal efficiency, and exergetic efficiency corresponding to the maximum ecological function for the gas-turbine cycle are presented. The effects of regeneration and hot–cold temperature ratio on power, entropy-generation rate, thermal efficiency and exergetic efficiency, all at the maximum ecological function, are determined. It is shown that both the power output and entropy-generation rate are increased significantly by the use of regenerators, and increase monotonically with an increase with hot/cold temperature ratio. The results further indicate that the thermal efficiency and exergetic efficiency are decreased by the use of regenerators and rise with an increase in the temperature ratio. By the introduction of the ecological function, the improvements in exergetic efficiency and thermal efficiency are evident. |
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