Thermodynamic and Economic Analysis of Waste Heat Recovery from Diesel Engine Generator in the oil tanker by Single and Double effect Absorption Refrigeration Cycles

In this study, the use of exhaust heat from, flow gas of the engine of an oil tanker in the single and double absorption system, thermodynamically and economically, has been analyzed for air conditioning of its residential space. The input parameters of the models are placed in the equations according to the tropical climate of the ship and the minimum recoverable heat of the engine exhaust gas, and the output of the models is calculated using EES software. The Lithium Bromide Single Effect Cycle does not meet the ship's needs for tropical conditions, but the double effect cycle with high reliability is suitable for all weather conditions. If the absorption cycle is affected, the amount of heat dissipation of fuel energy is 206.92 GJ/year, while this value is 47762 GJ/year for the compression cycle. Exergy analysis shows that the highest irreversibility rate in the double-effect absorption system is related to the high-temperature generator (at the rate of 76.94 kW). The recovery time of the initial cost of the double effect cycle compared to the compression cycle is calculated to be 3.78 years.