Abstract
This study attempted for the proposal and analysis of a combined cycle consists of a wet-ethanol fueled and turbocharged HCCI engine coupled to ejector refrigeration cycle (ERC) and absorption refrigeration cycle (ARC) for the simultaneous generation of two distinct outputs namely power and refrigeration. Both first and second laws of thermodynamics were employed to develop a thermodynamic model which has been applied to investigate the performance of combined cycle. Further, performance of the combined cycle for ERC versus ARC was compared and assessed after altering operating parameters (turbocharger pressure ratio, turbocharger compressor efficiency, ambient temperature, and the entrainment ratio of ERC and generator temperature of ARC) to study their effect on engine power output, refrigeration load, exergy of refrigeration, energy and exergy efficiencies of the cooling-power cogeneration cycle. Results show that elevated pressure of turbocharger results in the enhancement of HCCI engine power and increase of the refrigeration of thermal load, simultaneously. However, ambient temperature rising shows the decline of HCCI engine efficiencies and energy efficiency of cogeneration while the cogeneration cycle exergy efficiency is found increasing. Furthermore, the results are reported for the refrigeration performed by LiBr-H2O operated ARC, and R134a and R290 operated ERC, respectively. Mapping of exergy destruction for the presented cogeneration cycle discovered HCCI engine, boiler of ERC, generator of ARC, and catalytic convertor as the components of significant exergy destruction. Entrainment ratio and type of refrigerant employed in ERC and the generator temperature of ARC shows a marginal impact on the COPs.