SAE J3173:2020 pdf free

SAE J3173:2020 pdf free.Waste Heat Recovery System Thermal Management
Waste heat recovery (WHR) systems can be used in vehicles and machines powered by internal combustion (IC) engines to increase overall system efficiency by recouping usable energy from engine’s waste thermal energy and consequently reduce fuel consumption and emissions. This information report is a survey of the waste heat recovery methods that include thermal management systems with emphasis on those using an organic Rankine cycle (ORC) for energy recovery. Different WHR systems can be found in passenger cars and light trucks, medium and heavy trucks, and other vehicles and equipment powered by internal combustion engines. Waste thermal energy is turned into a useful form of energy by either direct recovery in the form of thermal energy or by converting thermal energy into either mechanical or electrical energy. Direct waste heat recovery typically recovers heat and utilizes this heat to warm up engine coolant or thermal fluid to aid in warming the passenger cabin or powertrain components. Energy recovery by converting thermal energy into mechanical energy usually utilizes ORC or Stirling cycle systems. Thermoelectric generators (TEGs) recover waste thermal energy and convert it directly into electrical energy, while ORCs and Stirling cycle engines do so indirectly by converting the recovered mechanical energy into electric energy using electric generators. This report will focus on recovering thermal energy and converting it into mechanical power by using ORC. These ORC systems typically include a working fluid circulating through an evaporator where exhaust heat is used to convert the working fluid from a liquid to a high-pressure gas. The pressure powers a generator that produces mechanical or electrical energy, then the fluid is routed into a condenser to bring it back to a liquid state for another cycle. This information report describes the systems available for use and now being considered with emphasis on the heat exchangers and thermal management of the process.SAE J3173 pdf free download.