Kondensor berperan penting dalam pengoperasian PLTU Indramayu yang berfungsi untuk mengkondensasikan uap sisa low pressure turbine. Tingkat kevakuman kondensor secara langsung mempengaruhi laju perpindahan panas dari uap ke air pendingin. Plugging penting untuk dilakukan supaya kinerja kondensor tetap optimal. Penelitian ini meliputi perhitungan LMTD, laju perpindahan panas (Q), koefisien perpindahan panas menyeluruh (U), Perhitungan Number of Transfer Unit (NTU) dan efektivitas kondensor (ɛ). Pada penelitian ini menggunakan 2 beban, yaitu 265 dan 280. Dimana pada beban 265 sebelum plugging tekanan vakum -0,9108 efektivitas 54,61%, setelah plugging tekanan vakum -0,8958 didapat efektivitas 36,7%, pada beban 280 sebelum plugging tekanan vakum -0,9178 didapat efektivitas 56%, sedangkan sesudah plugging tekanan vakum -0,8960 didapat efektivitas 41,15 %. Laju perpindahan panas Pada sebelum plugging 552.656,13 kJ/s dan 532.043,75 , kemudian setelah plugging meningkat menjadi 812.327,82 kJ/s dan 888.583,17 kJ/s. Hasil penelitian ini menunjukkan bahwa meskipun plugging berdampak pada penurunan tekanan vakum dan efektivitas kondensor, namun laju perpindahan panas meningkat secara signifikan, sehingga kinerja kondensor secara keseluruhan menjadi lebih baik.

The condenser plays a crucial role in the operation of the Indramayu coal-fired power plant (PLTU) by condensing the exhaust steam from the low-pressure turbine. The vacuum level in the condenser directly affects the heat transfer rate from the steam to the cooling water, making it essential to maintain optimal conditions. Plugging maintenance is necessary to ensure the condenser operates efficiently. This study focuses on calculating the Log Mean Temperature Difference (LMTD), heat transfer rate (Q), overall heat transfer coefficient (U), Number of Transfer Units (NTU), and condenser effectiveness (ɛ) under two different load conditions: 265 MW and 280 MW. At a 265 MW load, the vacuum pressure before the plugging was -0.9108 bar, with an effectiveness of 54.61%. However, after the plugging , the vacuum pressure slightly decreased to -0.8958 bar, and the effectiveness dropped to 36.7%. Similarly, at a 280 MW load, the vacuum pressure before the plugging was -0.9178 bar, with an effectiveness of 56%, but after the plugging , the vacuum pressure decreased to -0.8960 bar, leading to a lower effectiveness of 41.15%. Despite the decline in effectiveness, the heat transfer rate increased significantly. Before the plugging , the heat transfer rate was 552,656.13 kJ/s and 532,043.75 kJ/s, while after the plugging , it improved to 812,327.82 kJ/s and 888,583.17 kJ/s. These findings indicate that while the plugging maintenance affected vacuum pressure and effectiveness, it significantly improved the heat transfer rate, enhancing the overall performance of the condenser.