Second law analysis of an irreversible Braysson cycle

Sreenivas, Bura; Chandramouli, R.; Sudhakar, I.; Thulasiram, A.R.

doi:10.1504/ijex.2009.028576

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…This study also includes the effect of design parameters on the performance of the cycle. Sreenivas et al [16] conducted a second-law evaluation of an irreversible Braysson cycle, deriving and plotting the overall second-law efficiency across varying operating conditions. The study concluded that by varying input conditions like pressure and temperature, second law efficiency can be enhanced by minimizing thermodynamic losses.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of an ideal molten carbonate fuel cell (MCFC) and reheat & regenerative braysson cycle hybrid system

Soujanya,

Sastry,

Ramji

et al. 2024

Eng. Res. Express

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Direct energy conversion devices are gaining prominence because of their high efficiency, as the process involves the direct conversion of chemical energy to its electrical counterpart, bypassing the thermal energy phase. Fuel cells work on the principle of a chemical reaction between fuels like Hydrogen, Methane, propane, ammonia, and an oxidizer. The working temperature of the fuel cell is as high as (600 °C–700 °C). Generally, waste heat liberated from the fuel cells was used to generate power by running the Brayton (or) Rankine cycle. This work involves exergy and energy analysis on a hybrid system made of a Molten Carbonate Fuel Cell and reheat & regenerative Braysson cycle. Combining a molten carbonate fuel cell (MCFC) with a Braysson cycle results in a novel hybrid system that offers exciting possibilities for power generation. In the analysis, Molten Carbonate Fuel Cell is assumed to operate at 650 °C, and the turbine inlet temperature (TIT) range of the Braysson cycle is taken as 400 to 600 °C. It has been noticed that different optimum pressure ratio values exist to obtain maximum output of power and maximum efficiencies. Both the exergy and energy efficiencies of the combined cycle increase with the increase in turbine inlet temperature. This combined system depicts maximum energy and exergy efficiency of 96.84% and 95.13%, respectively. Destruction rates of exergy for individual equipment and the total system are also obtained as a function of TIT and pressure ratio. The exergy destruction rates are found to be maximum in the fuel cells. An optimum pressure ratio is found to be 1.4, where fuel consumption is the least and efficiencies are the maximum.

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Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of an ideal molten carbonate fuel cell (MCFC) and reheat & regenerative braysson cycle hybrid system

Soujanya,

Sastry,

Ramji

et al. 2024

Eng. Res. Express

View full text Add to dashboard Cite

show abstract

“…They optimized the performance characteristics of the system on the basis of linear heat-loss model of solar collector and the irreversible cycle model of a Braysson heat engine. Srinivas et al [7] performed second law analysis of an irreversible Braysson cycle. Lanmei et al [8] investigated an irreversible solar driven Braysson heat engine by taking into account the temperature dependent heat capacity of the working fluid, radiation-convection heat losses of solar collector and irreversibilities resulting from heat transfer and non-isentropic compression and expansion processes.…”

Section: Introductionmentioning

confidence: 99%