Internal combustion engines have a very important place in biogas production facilities to convert biogas energy to electricity. Unfortunately, although intense studies on improving internal combustion engine efficiencies by operational optimisation methods, serious progress is not achieved yet. However, there are many ways to improve the performance of these engines apart from structural optimisation methods. One of the most important ways is to utilize by integrating jacket water used to cool the biogas fuelled internal combustion engines into the new generation low-temperature heat recovery systems like organic Rankine cycles. In the present study, simple and regenerative organic Rankine cycles were optimised to improve the overall performance of an biogas fuelled internal combustion engine by using the jacket water which is released into the atmosphere after cooling the engine. Also, the energy, exergy and environmental aspect of these systems are evaluated. Finally, exergoeconomic analysis for both systems are conducted, and then payback periods of both systems are determined. As a result of the study, the maximum net power, thermal and exergy efficiencies of the simple organic Rankine cycle was calculated as 42.14 kW, 11.47 % and 63.27 % respectively, while the maximum net power, thermal and exergy efficiencies of the regenerative organic Rankine cycle are found as 45.3 kW, 12.34 % and 68.02 %. In addition, it is observed that the maximum power production obtained from the regenerative organic Rankine cycle corresponded to nearly 630 kg CO₂/h emission reduction. The best payback period value is also calculated as 7.37 years in the simple organic Rankine cycle.

内燃机在沼气生产设施中具有非常重要的地位，可将沼气能量转化为电能。不幸的是，尽管对通过运行优化方法提高内燃机效率进行了深入研究，但尚未取得重大进展。然而，除了结构优化方法外，还有许多方法可以提高这些发动机的性能。最重要的方法之一是将用于冷却沼气燃料内燃机的夹套水集成到新一代低温热回收系统中，如有机朗肯循环。在目前的研究中，通过使用冷却发动机后释放到大气中的夹套水，对简单且可再生的有机朗肯循环进行了优化，以提高沼气燃料内燃机的整体性能。此外，还评估了这些系统的能源、火用和环境方面。最后，对两个系统进行了工效经济学分析，然后确定了两个系统的投资回收期。作为研究的结果，简单有机朗肯循环的最大净功率、热效率和火用效率分别计算为 42.14 kW、11.47 % 和 63.27 %，而可再生有机朗肯循环的最大净功率、热效率和火用效率分别为发现循环为 45.3 kW、12.34 % 和 68.02 %。此外，₂ /h减排。在简单的有机朗肯循环中，最佳投资回收期值也计算为 7.37 年。