Abstract
This paperpresents a thermodynamicstudy of the exhaust waste heat recovery from turbochargedHomogenous Charge Compression Ignition (HCCI) enginepowered by wet-ethanol for a combined output of engine power and cooling system by using a LiBr-H2O absorption refrigerationcycle (ARC). For power production, an HCCI engine has been used, and an ARC driven by engine exhaust heat has been used as a bottoming cycle for refrigeration. While varying the compressor pressor ratio, compressor efficiency, and ARC generator temperature, the thermal and exergetic performance of the combined power and coolingcycle was investigated. The results showed that increasing the compressor ratio (2.25–3.75), and efficiency of the compressor (0.725–0.875), increases HCCI engine power and increases the cooling of the bottoming cycle. As a result, both thermal and exergeticefficienciesof the HCCI engineandcombined cycle increase. In addition, as the temperature of the generator (361–385 K) rises, the ARC's thermal and exergetic COPs decreases.