Utilizing renewable heat energy resources, Re-exploitation waste heat, are promising replacement to fossil fuels in the conversion to the zero-emission energy system. This study conducted an experimental investigation to comprehensively analyze the process of exploiting the potential energy of the enthalpy present in combusted gases emerging from the exhaust of a small-scale two-shaft gas turbine unit (TSGT) for the purpose of heating water. The experiment was conducted in an in house designed heat exchanger (HE), with the aim of extracting and converting the largest possible amount of energy from the exhaust gases with the least possible loss. The effect of various loads generated from the TSGT unit on the output performance and extent of potential energy utilization was investigated. Through this investigation, when connecting the TSGT unit with the HE, the exergetic efficiency of the overall unit was computed with and without the HE. The maximum values recorded for exergetic efficiency was 88. 4% compared to that without HE (8. 1%) for generated power of 88 W. Further, the net rate exergy wasted in case of the combustion products, which included the exhaust gases, was reduced (maximum decline value from 14. 716 kW to 0. 1844 kW at of 465 W). Moreover, the reduction in the unit cost (⁄ kW. h) for the exergy product was clarified, with a maximum reduction of 121. 84 (⁄ kW. h) for of 88 W to 1. 12. Furthermore, a thermoeconomic feasibility study for this process was conducted based on the Iraqi price tariff per unit of gas.
Dulaimi et al. (Thu,) studied this question.