Demiss, Alemu (PhD)Natnael, Mesfin2020-12-012023-11-182020-12-012023-11-182018-11http://etd.aau.edu.et/handle/12345678/23752As energy crisis become increasingly noticeable, the energy consumption has become the main problem which restricts the sustainable development of industry. The recovery and utilization of different kinds of waste heat can effectively reduce energy consumption of the company. Therefore, recovery and utilization of waste heat become very important. Energy saving is one of the crucial concern, not only from the point of view of fuel consumption but also for the conservation and protection of global environment. So, it is important that a significant and great effort should be made for conserving energy from waste heat. Recovering and reusing this waste heat would provide an attractive opportunity for less costly energy resource. Most industry use furnace to melt metals and metal scraps for manufacturing spare parts, by doing this they can reduce cost of buying spare parts for the machine. However, during combustion process of furnace oil enormous amount of heat energy is wasted to the environment via chimney which is embedded in the flue gas. The furnace working temperature is about 1400°C.Based on the measured parameters such as the average temperature of flue gas at the hood and chimney was about 240°C and 146°C respectively. From heat transfer analysis calculation, the amount of waste heat obtained from hot flue gas was about 24.4kw, Hence, the amount of heat is recovered from the flue gas is about 37.6%. This study aims at providing a flue gas as an alternative energy to dry the mold in the foundry shop instead of drying by burning of wood. In this study temperature and velocity of flue gas at different locations were measured and analytical calculation was made on flue gas supply system and mold drying room. Simulation has been done using Computational Fluid Dynamics (CFD) Ansys software to show what is going on inside the hot flue gas supply duct and mold drying room. Tapping hot flue gas from top part of the furnace or chimney and supplying via duct to drying room to dry the mold will benefit the industry-; by reducing fuel consumption, saving the cost of the wood by 90%, making economical and environmental friendly. This will reduce impact of deforestation and create good working environment.en-USANSYS (CFD)ChimneyDrying roomFurnaceFlue gasHeat lossesMoldsSupply ductWaste Heat RecoveryThesis