https://upcommons.upc.edu/bitstream/handle/2117/24452/Clear%20manuscript_Gravity.pdf;sequence=1

Experimental Validation of a Real-Time Energy Management System Using Multi-Period Gravitational Search Algorithm for Microgrids in Islanded Mode

This paper studies competition between air transport and high-speed rail (HSR). While airlines are assumed to maximize profit, HSR may maximize a weighted sum of profit and social welfare. The authors show that both airfare and HSR fare fall as the weight on welfare increases, while airfare decreases, and rail fare increases, in the airport access time. Furthermore, airfare decreases in the rail speed if the marginal cost of HSR with respect to the rail speed is not too large. On the other hand, whether rail fare increases in the rail speed depends on the marginal cost of HSR with respect to the rail speed as well as on the welfare weight. The authors further compare prices, profits and welfare between “with price discrimination” in which airlines price discriminate business from leisure passengers and “without price discrimination”. Welfare in the HSR system can be either higher or lower with price discrimination: In particular, the welfare is higher under price discrimination when the travel benefit difference is sufficiently larger than the time value difference between business and leisure passengers.

Effects of High-Speed Rail and Air Transport Competition on Prices, Profits and Welfare

A spatial multi-period long-term energy planning model: A case study of the Greek power system

Advances in exergy analysis: a novel assessment of the Extended Exergy Accounting method

Exergetic sustainability analysis of LM6000 gas turbine power plant with steam cycle

This paper focuses on the exergetic sustainability indicators of a medium-range commercial aircraft engine for constant reference environment and ground running conditions. First, a detailed exergy analysis of turbofan engine have been performed based on engine test cell parameters. Starting from the sustainability considerations and the second law of the thermodynamics, the paper presents six exergy-based sustainability indicators. The indicators of the turbofan engine developed here in conjunction with exergetic analysis and sustainable development are exergy efficiency, waste exergy ratio, exergy destruction factor, recoverable exergy rate, environmental effect factor, and exergetic sustainability index. The investigated sustainable indicators have been calculated by using exergy analysis outputs for aircraft ground running condition. Results from this study show that values of exergy efficiency, waste exergy ratio, exergy destruction factor, recoverable exergy rate, environmental effect factor, and ex...

Hakan Aydin

Papers

Exergetic sustainability analysis of LM6000 gas turbine power plant with steam cycle

Exergetic Sustainability Indicators as a Tool in Commercial Aircraft: A Case Study for a Turbofan Engine

Exergo-sustainability indicators of a turboprop aircraft for the phases of a flight

Environmental impact assessment of a turboprop engine with the aid of exergy

Dynamic modeling of exergy efficiency of turboprop engine components using hybrid genetic algorithm-artificial neural networks