Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit

Osman, Azmi and Zulkifli, Nurin Wahidah Mohd and Said, Mior A. and Kamaruddin, Tengku N. A. Tuan (2021) Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit. Advances in Mechanical Engineering, 13 (6). ISSN 1687-8132, DOI https://doi.org/10.1177/16878140211026069.

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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.

Item Type: Article
Uncontrolled Keywords: Internal combustion engine; Thermal management system; exhaust heat recovery; Low-grade heat; Low thermal inertia; Accelerated engine warm up
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 Mar 2022 05:03
Last Modified: 07 Mar 2022 05:03
URI: http://eprints.um.edu.my/id/eprint/26470

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