Parametric Investigations and Thermodynamic Optimization of Regenerative Brayton Heat Engine

The modified configuration of regenerated Brayton heat engine along with pressure drop losses in its irreversible mode is thermodynamically investigated and optimized. The temperature difference between the system and the reservoirs is considered as the source of external irreversibility. On the other hand, frictional losses in compressor/turbine, regenerative heat and pressure losses induce internal irreversibilities in the system. The output power of the cycle is thermodynamically optimized in context with cycle temperature. It is found that regenerative effectiveness plays a vital role in obtaining maximum possible output power, and first law efficiency predominantly depends on the cold-side effectiveness in the system. It is also observed that the thermodynamic performance of the proposed system/device prominently depends on the efficiency of the turbine and consequently is less dependent on compressor efficiency. Moreover, the model investigated in this study yields lesser output power/first law efficiency and exactly follows the results/outcomes presented in the available literature at α1 = α2 = 1, which are the pressure recovery coefficients at two ends.