Analisis Efektifitas Thermal pada Sistem Pendingin Udara Generator Melalui Modifikasi Laju Aliran 2 Fase Menjadi 4 Fase di Plta Saguling

Rio Arman Saputra; Muhammad Safi'i; Althesa Androva

doi:10.61132/konstruksi.v4i3.1421

Authors

Rio Arman Saputra Universitas PGRI Semarang
Muhammad Safi'i Program Studi Teknik Mesin, Universitas Persatuan Guru Republik Indonesia Semarang, Indonesia
Althesa Androva Universitas PGRI Semarang

DOI:

https://doi.org/10.61132/konstruksi.v4i3.1421

Keywords:

Air-Cooler Generator, Heat Exchanger, LMTD, NTU, Thermal Effectiveness

Abstract

Generator air cooling system (Air Cooler) at the Saguling Hydroelectric Power Plant (PLTA Saguling) plays a crucial role in maintaining the operational reliability and efficiency of the 206.10 MVA generator units. Replacing the tube material from Cu-Ni to AISI 304 Stainless Steel resulted in reduced thermal performance because of its lower thermal conductivity. This study aims to analyze the thermal effectiveness before and after modifying the heat exchanger flow configuration from a 2-pass to a 4-pass system using the Log Mean Temperature Difference (LMTD) and Number of Transfer Units (NTU) methods. The analysis was conducted using actual operational data obtained from the plant under normal operating conditions. The modification successfully increased the air-side heat transfer rate (Q_air) from 342.28 J/s to 477.22 J/s and the water-side heat transfer rate (Q_water) from 419.06 J/s to 656.64 J/s. The thermal effectiveness (ε) also increased significantly from 63% to 72%, indicating improved heat transfer performance. These findings demonstrate that modifying the pass configuration effectively enhances cooling system performance and supports reliable generator operation at the Saguling Hydroelectric Power Plant.

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