Energetic and Exergetic Investigation of Diesel - Brayton and Organic Rankine Combined Cycle

M N Khan

Keywords: Work output, Thermal efficiency, SFC, Exergy loss, Diesel engine, GTC, ORC

Issue II, Volume II, Pages 55 - 68

The amount of energy lost through the exhaust gases from diesel as well as gas

turbine power plant is much enough to enhance the performance of the power system as well

as to operate another secondary power generation system. If this energy is not to be used, it

will results in global warming and enhance the local air pollution problem. Present study

proposes a new cycle to utilizes exhaust gas energy from diesel engines and gas turbine power

plants to optimize the performance of the combined cycle. In the proposed system, the waste

energy from the exhaust gas of the diesel power plant is to used to enhance the thermal

efficiency of the gas turbine cycle (GTC), and the waste energy from the exhaust gases of the

GTC is to utilized to operate an organic Rankine cycle (ORC). To investigate the overall

performance of the proposed system, the pressure ratio and turbine inlet temperature (TIT) of

GTC are used as variables. The result shows that the gain in thermal efficiency and work output

of the proposed system is about 15% to 43% and 13% to 20.4% as compared to diesel plus

simple GTC system when TIT increases from 900K to 1200K. The exhaust gases exergy loss

from the diesel system and simple GTC is much high as compared to the proposed-system.

The total exhaust gases exergy loss from the proposed-system is decreased by 3.5 to 1.35 times

as compared to the total exhaust gases exergy loss from diesel cycle and simple GTC.

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