Performance Evaluation of Jenbacher Type 3 Gas Engine Based on Heat Rate and Thermal Efficiency According to Electric Power Research Institute (EPRI) Standard at Bawean Island Gas Power Plant

Abstract

Gas engine power plants are widely utilized in isolated and small-grid systems due to their operational flexibility and relatively high efficiency. However, performance degradation frequently occurs under part-load conditions, significantly affecting heat rate and thermal efficiency. This study evaluates the performance of a Jenbacher Type 3 gas engine based on heat rate and thermal efficiency parameters in accordance with Electric Power Research Institute (EPRI) standards. Operational data were collected at various load conditions ranging from low load to peak load at PLTMG Bawean island. Heat rate and thermal efficiency were calculated using fuel consumption rate and electrical output measurements. The results indicate that heat rate increases significantly under low-load operation, leading to a noticeable reduction in thermal efficiency. At peak load conditions, the engine demonstrates optimal performance and complies with EPRI efficiency benchmarks. The findings provide a technical evaluation reference for optimizing gas engine operation and minimizing fuel consumption in small-scale power generation systems.