Experimental investigation on diesel engine's waste heat capacity under mapping characteristics

• 作 者: TIAN Hua ZHANG ChengYu LI XiaoNing SHU GeQun
• 机 构: State Key Laboratory of Engines, Tianjin University,
• 出 处: Science China(Technological Sciences)
• 发表日期: 2015年01期
• 关键词: diesel exhaust combustion Figure shortage actually dramatic outlet inlet viewpoi

Waste heat recovery for internal combustion engine(ICE)has been considered as an important strategy to improve efficiency and promote fuel economy,thus alleviating the problems of energy shortage and environmental pollution.This paper investigates the characteristics of various kinds of waste heat energy,namely,waste heat in exhaust,cooling water and charge air,over the engine’s whole operating region.Based on the energy balance experiments,the energy distribution of a conventional heavy-duty diesel engine is obtained under mapping characteristics.According to exergy analysis,the energy recovery potential for waste heat is studied as well.The experimental results indicate that exhaust energy increases with engine speed and load,while cooling water energy is more sensitive to load,especially at low and middle speed.Charge air energy,on the other hand,mainly counts on speed rather than load.Exhaust energy possesses the highest recovery potential in terms of both quantity and quality.Through waste heat recovery,a dramatic improvement in engine efficiency is achievable,actually,the maximum value can amount to 60%or even more.

Waste heat recovery for internal combustion engine (ICE) has been considered as an important strategy to improve efficiency and promote fuel economy, thus alleviating the problems of energy shortage and environmental pollution.This paper investigates the characteristics of various kinds of waste heat energy. , waste heat in exhaust, cooling water and charge air, over the engine’s whole operating region. Based on the energy balance experiments, the energy distribution of a conventional heavy-duty diesel engine is obtained under mapping characteristics. According to exergy analysis, the energy recovery potential for waste heat is studied as well. the experimental results indicate that exhaust energy increases with engine speed and load, while cooling water energy is more sensitive to load, especially at low and middle speed. Charge air energy, on the other hand, mainly counts on speed rather than load. Exhaust energy possesses the highest recovery potential in terms of both quantity and quality.Th rough waste heat recovery, a dramatic improvement in engine efficiency is achievable, actually, the maximum value can amount to 60% or even more.