Study on Optimization of Different Characteristics of Novel Shaped FSS
This paper deals with the simulated as well as measured results of a Frequency selective surface with perfectly conducting novel shaped elements. This frequency selective surface (FSS) acts like a single band-reject filter. The proposed design has been investigated theoretically using Ansoft Designer® software in which the reflection and transmission bands have been predicted by the method known as Method of Moment. Further experimental investigation is performed using standard microwave test bench. In comparison to the reference square patched Frequency Selective Surface (FSS) without slot, this FSS with novel design can provide size reduction up to 84.98%. Efforts have been given to achieve optimized value for different characteristics of FSS.
A design approach for dual-polarized multiband frequency selective surfaces using fractal elements
We propose a technique for the design of multiband frequency selective surfaces (FSSs) that is based on the use of fractal screen elements. We demonstrate the design methodology by exploiting the self-similarity of the crossbar fractal to implement a tri-band FSS. Another benefit of this design approach, in addition to its multiband performance, is that the frequency response of both the TE and TM modes are exactly the same, owing to the symmetry in the tree-like fractal structure of the screen elements. Dielectric loading effects have been considered for practical implementation of designs with coverage exceeding two bands.
Techno-economic analysis of chemical looping combustion with humid air turbine power cycle
Abstract Power generation from fossil fuel-fired power plant is the largest single source of CO2 emission. CO2 emission contributes to climate change. On the other hand, renewable energy is hindered by complex constraints in dealing with large scale application and high price. Power generation from fossil fuels with CO2 capture is therefore necessary to meet the increasing energy demand, and reduce the emission of CO2. This paper presents a process simulation and economic analysis of the chemical looping combustion (CLC) integrated with humid air turbine (HAT) cycle for natural gas-fired power plant with CO2 capture. The study shows that the CLC–HAT including CO2 capture has a thermal efficiency of 57% at oxidizing temperature of 1200 °C and reducer inlet temperature of 530 °C. The economic evaluation shows that the 50 MWth plant with a projected lifetime of 30 years will have a payback period of 7 years and 6 years for conventional HAT and CLC–HAT cycles respectively. The analysis indicates that CLC–HAT process has a high potential to be commercialised.