Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit
Document Type
Article
Publication Date
6-1-2021
Abstract
Modern engines in general waste plenty of heat to the exhaust gas and coolant. Considering that daily driving consists of frequent cold start, idling, and part load driving within short driving distances, the potentials to recover heat from high enthalpy exhaust gas are limited. In recovering heat from low enthalpy exhaust gas, a low thermal inertia exhaust heat recovery unit (EHRU) with no heat transfer fins is proposed to be integrated to the simplified split cooling circuit used in the earlier studies. This lightweight, compact and simple EHRU concept made of machined steel plate is targeted for naturally aspirated engines that are still being widely used worldwide. Cooler coolant feed from the bottom of the cylinder block's water jacket rear end provided large temperature difference between the coolant and exhaust gas. In evaluating its effectiveness in speeding up the recovered heat availability for reuse, a 1.3 l passenger car equipped with strategically placed multiple thermocouples and flow meters was tested using NEDC test. From the experiments and classical analysis, the recovered thermal energy was available in just 25 s after cold start. The study also provided a new direction on the design of EHRU and its integration into an engine.
Keywords
Internal combustion engine, Thermal management system, exhaust heat recovery, Low-grade heat, Low thermal inertia, Accelerated engine warm up
Divisions
fac_eng
Publication Title
Advances in Mechanical Engineering
Volume
13
Issue
6
Publisher
SAGE Publications
Publisher Location
1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND