Simulasi Penambahan Sistem Kabut Air pada Model Air-Cooled Heat Exchanger (ACHE) dengan Menggunakan Software Ansys

Abstract

The function of an Air-Cooled Heat Exchanger (ACHE) is to serve as a cooling system that utilizes ambient air as the cooling medium. One of the advantages of using air is its low cost and abundant availability in the surrounding environment. However, a major drawback of ACHE is its low thermal performance due to the relatively low heat transfer coefficient on the air side, which is also influenced by the ambient air temperature (Ta). In this study, the author conducted a simulation of an ACHE system enhanced with a water mist spray using Ansys software. This study employs Computational Fluid Dynamics (CFD) to determine the optimal water spray rate for the misting system based on the ambient air temperature (Ta). The amount of water sprayed varies from 0 kg/h, 2 kg/h, 4 kg/h, 6 kg/h, and 8 kg/h. At an ambient temperature of 303.15 K, the cooling effect on the pipe outlet temperature increased by 35.39 K, 38.24 K, 39.35 K, 40.38 K, and 46.29 K, respectively. At an ambient temperature of 313.15 K, the cooling effect increased by 31.02 K, 33.40 K, 34.73 K, 35.71 K, and 40.71 K, respectively. Under the thermal conditions of the Sarulla Geothermal Power Plant (PLTP Sarulla), the cooling effect on the pipe outlet temperature increased by 36.12 K, 39.1 K, 40.06 K, 40.62 K, and 45.35 K, respectively.