The Development Of Downsided Waste Heat Recovery System For Vehicle Based On Scroll Expander

At Present, energy and environmental issues are the hot spots of the social development. Energy-conserving and environment friendly technologies lead the tendency of industry. As an energy-saving technology, the small-sized and medium waste heat recovery system based on the Organic Rankine Cycle (ORC) can convert the waste energy to power from low-grade heat sources, which has been fully developed and widely used in kinds of fields. There is nearly50%of an engine’s fuel combustion energy dissipated by the engine exhaust system and coolant system. The utilizing of this portion of waste heat will improves the fuel consumption greatly and makes significant contribution to the society. Thus, a small-sized waste heat recovery system which has broad prospect is designed to realize this purpose.In this thesis, the significance and present developing situation are first mentioned. Then the fundamentals of thermodynamics about the waste heat recovery and the scroll expander which is employed as the key power-output cell in this system are introduced briefly. Based on these theoretical investigations, an engine coolant waste heat recovery system is design and calculated in detail. The system’s first-law thermal efficiency is designed to be maximized, and the system’s power output can meet the demand of driving the vehicle generator to charge the storage battery. According to the result of design calculation, a matched scroll expander is designed and produced. The basic characteristics and performance is of this device is researched via a specialized test bench. At last, the downsized engine coolant waste heat recovery system using a scroll expander is established to test and verify the effectiveness of the design.Based on the test result, the thesis analyzes the feasibility of this power-saving system as well as correlative extended system, and expects that it will be widely applied to practice in the future.