STUDY OF THE THERMAL CONDITION OF THE TUNNEL IN THE PROCESS OF LOADING-HAULING MATERIALS WITH LOAD HAUL DUMP DIESEL EQUIPMENT AT PT XYZ RAMP DOWN LOCATION

• Main Author: Zaka Waly, Fadli
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61926
• Institution: Institut Teknologi Bandung

All activities in underground mining, one of which is loading and transporting materials on-ramp down, cannot be carried out 100% effectively because there are internal factors (tools and workers) and external factors (work environment) that affect changes in velocity and temperature-humidity values which are the components forming the effective temperature of the thermal conditions of a worksite. Therefore, a good ventilation system is needed to achieve an effective temperature. This research uses computational numerical method simulation based on fluid dynamics called Computational Fluid Dynamics (CFD) using Ansys software. The numerical model of the auxiliary ventilation system was validated based on Gani's (2017) research data. Then, changes in conditions due to heat sources are brought closer to Yulianti's (2020) research data. The model made is Model 1 for initial validation with criteria for air velocity 19.05 m/s (with a cross-sectional diameter of 0,9 m air duct), relative humidity inlet 79.1% and intake air temperature 30.5 °C, Model 2 with a heat source from a 102 kW LHD engine and operator, two 37 kW exhaust fans, and a foreman, then the Model 3 differs from the Model 2 in the intake air temperature by a value of 20 °C and as a recommended model. Based on the modeling results, the research has an error rate based on Model 1 against the actual conditions in the range of values of 0.01%-2.38%. Then, the change in temperature due to the presence of a working heat source in Model 1 has a Gradient 1 of 1.26 °C/hour, a Gradient 2 of 0.70 °C/hour, and a Gradient of 3 -0.05 °C/hour while Model 2 has a Gradient 1 1.29 °C/hour, Gradient 2 0.71 °C/hour, and Gradient 3 -0.05 °C/hour. The model that complies with the feasibility standard based on ventilation systems regulation in Indonesia is Model 3 which produces an effective temperature at a normal temperature of 25.1 °C, a peak temperature of 25.9 °C, and a residual temperature of 25.7 °C.