DESIGN OF HEAT EXCHANGER FOR EXHAUST HEAT RECOVERY OF A SINGLE CYLINDER COMPRESSION IGNITION ENGINE

Abstract

In automotive IC engines, only 25% of heat energy is utilized to produce power whereas about 75% of heat is wasted along with exhaust gas. This work attempts to recover the heat energy from engine exhaust gas with the aid of a heat exchanger. Initially, the amount of availability of heat energy in exhaust gas was identified by conducting heat balance test on a single cylinder naturally aspirated diesel engine at various loads. Based on the heat exchanger design principle, the number of fins, thickness, length and other dimensions are varied numerically and optimization has done to ensure maximum possible heat transfer from the exhaust gas. From the optimised heat exchanger, additional heat energy can be recovered from the exhaust gas and is beneficial for an engine to do useful work with an increment of overall efficiency.

Keywords

• Engine exhaust gas
• Heat exchanger
• Heat energy recovery