It is continually being researched and improved upon how to make thermodynamic power cycles as efficient as the Carnot cycle. Various strategies that have been tested and are performing well are included in these efforts to improve the thermal efficiency of the cycle. Due to their high efficiency, coupled cycles have become a popular option for power cycles. However, there is still room for improvement by making more changes to the thermodynamic cycle's thermal efficiency. Based on the first and second laws of thermodynamics, the present study examines the impact of ambient temperature and design parameters such as cycle pressure ratio and turbine inlet temperature in a combined cycle using transcritical carbon dioxide, and a binary mixture of ammonia and water. The result of the energy and exergy analysis of considered combined cycle using ammonia water mixture show that when maximum work output is obtained then thefirst law efficiency and second law efficiency are at value of 62.01% and 60.27% respectively. This lesser value of second law efficiency opens opportunities for removing sources of inefficiencies to make combined cycles much more efficient.