Numerical Study for the Modified Cooler of SAF Motor at Power Plant

Khoirul Huda*, Prabowo, Bambang Arip Dwiyantoro, Teguh Widjayanto

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


At a power plant with a capacity of 2 × 110 MW with Circulating Fluidized Bed (CFB) boiler type, the air supplier for boiler combustion involves three equipment, namely primary air fan, secondary air fan, and high-pressure fluidizing fan. Secondary air fan is driven by a 6 kV motor that is cooled by a cooler with shell and tube type where the shell side is hot air due to electric heat from winding and the tube side is cold air taken from the ambient and flowed by an external fan. The problem was high winding temperature while operated at high load. The winding temperature has a limit from 130 ℃ (alarm) until 140 ℃ (trip), while at that time the wind was about 120 ℃, this closed to limit and still had a risk. At the first time, experimental modifications were made to the cooler to obtain better cooling performance by adjusting the external guide plate to reduce the number of the tube. The CFD numerical analysis was carried out to find an optimum model to analyze the geometry of tubes inlet, velocity inside tubes, especially to Tout shell side, q˙ (heat transfer rate), NTU, and ε (effectiveness). In the end, we obtained that in model 75% was better than model 100%. Tout shell side decreased, and q˙ (heat transfer rate) increased. This result was due to lower flow maldistribution at 75% model than the existing model (100% model), so thus proving that the final 75% model with uniform airflow had a better cooling performance.

Original languageEnglish
Title of host publicationRecent Advances in Renewable Energy Systems - Select Proceedings of ICOME 2021
EditorsMohan Kolhe, Aziz Muhammad, Abdel El Kharbachi, Tri Yogi Yuwono
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages7
ISBN (Print)9789811915802
Publication statusPublished - 2022
Event5th International Conference on Mechanical Engineering, ICOME 2021 - Virtual, Online
Duration: 25 Aug 202126 Aug 2021

Publication series

NameLecture Notes in Electrical Engineering
ISSN (Print)1876-1100
ISSN (Electronic)1876-1119


Conference5th International Conference on Mechanical Engineering, ICOME 2021
CityVirtual, Online


  • Cooler
  • Flow maldistribution
  • Motor


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