The purpose of this study is to technically design an aluminium scrap processing machine by utilizing the direct exhaust hot air using a conveyor drying system. The automotive parts manufacturing industries use aluminium, a material that requires large amounts of energy for processing. As a result waste heat energy and scrap aluminium are produced -both could be used for savings and efficiencies. One option is utilizing exhaust hot air for the drying process of scrap material for reprocessing. The technical design of the machine follows four steps: analysing the production flow; calculating the potential energy of utilizing the exhaust hot air; designing the exhaust air utilization system for the washing and drying system; analysing the energy savings and the additional techno-economic value added from the system to reprocess the scrap aluminium chips and powder. Our analysis suggests the core melting process still uses 50% of raw material from ingot, but the other 50% from scrap (20% dry scrap briquettes and 30% dry scrap solids). The added value of the design is the material cost savings from the difference between the selling price of unprocessed scrap material and the price of the raw material purchased.

The electricity crisis in Indonesia can be averted with comprehensive planning, management of energy systems (demand-side management), efforts to utilize alternative energy sources and energy conservation. Dependence on fossil energy sources should be reduced and on the other hand, the utilization of new and renewable energy sources should increase. In the long term, fossil energy use must decline given the petroleum depletion and environmental unsustainability [1][2][3]. Indonesia is one of the countries that has committed to reducing greenhouse gas emissions (GHG) to 29% below business as usual by 2030 or a 41% reduction target contingent on sufficient international financial support. Indonesia also submitted its first longterm strategy to the United Nations Framework on Climate Change Conference, UNFCCC, which indicates the country plans to peak GHG emissions in 2030 and reach net-zero GHG emissions by 2060 or sooner [4][5][6].The demand for electrical energy in Indonesia continues to increase with the population growth and become an integral part of the needs of people living in line with