Helium Brayton cycles have been studied as power cycles for both fission and fusion reactors obtaining high thermal efficiency. This paper studies several technological schemes of helium Brayton cycles applied for the HiPER reactor proposal. Since HiPER integrates technologies available at short term, its working conditions results in a very low maximum temperature of the energy sources, someth...

In this study, the performance of an irreversible regenerative Brayton cycle is sought through power maximizations using finite-time thermodynamic concept in finite-size components. Optimizations are performed using a genetic algorithm. In order to take into account the finite-time and finite-size concepts in the current problem, a dimensionless mass-flow rate parameter is used to deploy ti...

The supercritical CO2 is used as working fluid for power system cycle. This paper presents thermodynamic performance analysis results on Brayton Based the assumptions of relevant initial parameters, mathematical models compressor, turbine, recuperator and heater are constructed, thermal efficiency regenerative cycle recompression calculated analyzed. reveal that higher than simple effects inlet...

Recovery of the low-temperature waste heat for electricity generation has been gaining a significant interest. An Inverted Brayton Cycle (IBC) is often employed to convert waste-heat while thermal efficiency and specific work output are poor. In this paper, new energy recovery scheme introduced incorporating IBC with Regenerative Heat Mass Exchanger (RHME). The RHME mass exchanger that consolid...

The article deals with the study on efficiency of units for porous ammonium nitrate production. ways which increase effective implementation energy resources are determined by including ejector recycling module, heat and mass exchangers that utilize principles regenerative indirect evaporative cooling, sub-atmospheric inverse Brayton cycle. Mixed exergy analysis evaluates all flows system conto...

We investigate the optimization of turbo-Brayton cycles for cooling current leads. Simple models of single stage current lead, two-stage current lead and two stage current lead coupled with a double stage turbo-Brayton cycle have been used to provide understanding about the issues and the tradeoffs. In addition, we discuss the possibility of using the heat exchanger in the turbo-Brayton system ...

This paper provides a preliminary analysis of the supercritical Brayton cycle, a power generation system for space exploration. Supercritical working fluids increase efficiency due to increased compressibility at the critical point but have not been investigated at the high temperatures necessary for space power generation. Through computer simulation, the viability of the supercritical Brayton...

conceptual design of a waste heat recovery cycle is carried out in attempt to enhance the thermal efficiency of a steam power plant. in the recovery system, super-critical an co2 is employed as the working fluid operating in a brayton cycle. low grade heat rejected by the flue gases through the stack is used as the primary heat source, while a secondary heat exchanger utilizes the hot gases lea...

Original scientific paper Nondimensional expressions for the work output, thermal efficiency, heat input, and entropy generation number in the Brayton cycle with a recuperator are given as functions of seven input parameters: pressure ratio, temperature ratio, recuperator effectiveness, turbine and compressor isentropic efficiencies, nondimensional pressure drop in the combustor and recuperator...