Simulation and experimental design of thermoacoustic heat engine

Renewable energy is an important field in providing reliable and sustainable energy to the world. Wasted heat is found to be a good source of renewable energy. This wasted energy can be found almost in all types of production processes, including the heat exchanger. The heat energy dissipated from t...

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Main Author:	Abd. Rahim, Irfan
Format:	Thesis
Language:	English
Published:	2020
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/101844/1/IrfanAbdRahimPSKM2020.pdf
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id	my-utm-ep.101844
record_format	uketd_dc
spelling	my-utm-ep.1018442023-07-22T02:54:42Z Simulation and experimental design of thermoacoustic heat engine 2020 Abd. Rahim, Irfan TJ Mechanical engineering and machinery Renewable energy is an important field in providing reliable and sustainable energy to the world. Wasted heat is found to be a good source of renewable energy. This wasted energy can be found almost in all types of production processes, including the heat exchanger. The heat energy dissipated from these processes is unutilized leading to inefficiency in the system. The need to harvest the wasted heat is essential in making sure the energy can be further utilized for other applications. Previous research works conducted on harvesting heat into sound in the system is still lacking and there is no specific standard can be employed. This research focused on analysing and developing a reference method of harvesting sound from a thermoacoustic heat engine system. A simulation approach was employed to investigate the performance of heat flow on the heat exchanger and related components. A standard test rig was designed to evaluate the performance of heat transfer experimentally. A comprehensive laboratory work was set-up to collect ample data to obtain the correlation of acoustic sound pressure-volume due to heat transfer performance by the oscillatory flow on the thermoacoustic system. The design of the developed thermoacoustic engine was able to produce waste heat in the range between 200°C and 700°C, and the harvested sound frequency ranged from 20Hz to 2kHz. From the experimental study, the sound level started at 4s to 8s and reaches a steady-state at 10s. The temperature gradient on stack performance was 8.45°C/mm with a temperature difference at the steady-state point of 300°C. The spectrum analysis amplitude reached 133.5dB with the frequency value of 397.5 Hz. The pressure volume analysis has proved the existence of both isochoric and isothermal process through the gas bucket brigade phenomenon as the lead compression and expansion happened at the stack wall between the sound pressures of 12.94Pa and 20.15Pa. The finding confirmed that the sound energy from the heat oscillation can be harvested and a standard method has been developed. This study also confirmed the presence of a thermoacoustic cycle on the stack wall. This finding is significant as it provides a new standard in harvesting sound from the thermoacoustic heat engine. The efficiency of the system was successfully improved by 40% and the wasted energy was successfully harvested for further applications. 2020 Thesis http://eprints.utm.my/id/eprint/101844/ http://eprints.utm.my/id/eprint/101844/1/IrfanAbdRahimPSKM2020.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:147268 phd doctoral Universiti Teknologi Malaysia, Faculty of Engineering - School of Mechanical Engineering Faculty of Engineering - School of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abd. Rahim, Irfan Simulation and experimental design of thermoacoustic heat engine
description	Renewable energy is an important field in providing reliable and sustainable energy to the world. Wasted heat is found to be a good source of renewable energy. This wasted energy can be found almost in all types of production processes, including the heat exchanger. The heat energy dissipated from these processes is unutilized leading to inefficiency in the system. The need to harvest the wasted heat is essential in making sure the energy can be further utilized for other applications. Previous research works conducted on harvesting heat into sound in the system is still lacking and there is no specific standard can be employed. This research focused on analysing and developing a reference method of harvesting sound from a thermoacoustic heat engine system. A simulation approach was employed to investigate the performance of heat flow on the heat exchanger and related components. A standard test rig was designed to evaluate the performance of heat transfer experimentally. A comprehensive laboratory work was set-up to collect ample data to obtain the correlation of acoustic sound pressure-volume due to heat transfer performance by the oscillatory flow on the thermoacoustic system. The design of the developed thermoacoustic engine was able to produce waste heat in the range between 200°C and 700°C, and the harvested sound frequency ranged from 20Hz to 2kHz. From the experimental study, the sound level started at 4s to 8s and reaches a steady-state at 10s. The temperature gradient on stack performance was 8.45°C/mm with a temperature difference at the steady-state point of 300°C. The spectrum analysis amplitude reached 133.5dB with the frequency value of 397.5 Hz. The pressure volume analysis has proved the existence of both isochoric and isothermal process through the gas bucket brigade phenomenon as the lead compression and expansion happened at the stack wall between the sound pressures of 12.94Pa and 20.15Pa. The finding confirmed that the sound energy from the heat oscillation can be harvested and a standard method has been developed. This study also confirmed the presence of a thermoacoustic cycle on the stack wall. This finding is significant as it provides a new standard in harvesting sound from the thermoacoustic heat engine. The efficiency of the system was successfully improved by 40% and the wasted energy was successfully harvested for further applications.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abd. Rahim, Irfan
author_facet	Abd. Rahim, Irfan
author_sort	Abd. Rahim, Irfan
title	Simulation and experimental design of thermoacoustic heat engine
title_short	Simulation and experimental design of thermoacoustic heat engine
title_full	Simulation and experimental design of thermoacoustic heat engine
title_fullStr	Simulation and experimental design of thermoacoustic heat engine
title_full_unstemmed	Simulation and experimental design of thermoacoustic heat engine
title_sort	simulation and experimental design of thermoacoustic heat engine
granting_institution	Universiti Teknologi Malaysia, Faculty of Engineering - School of Mechanical Engineering
granting_department	Faculty of Engineering - School of Mechanical Engineering
publishDate	2020
url	http://eprints.utm.my/id/eprint/101844/1/IrfanAbdRahimPSKM2020.pdf
_version_	1776100785129521152

Simulation and experimental design of thermoacoustic heat engine

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