Experimental study and optimization on thermoelectric generator combined with heat pipe-heat sink /
Ali Elhade Elghool,
Experimental study and optimization on thermoelectric generator combined with heat pipe-heat sink / Ali Elhade Elghool - xviii, 207 pages : illustrations (some color) ; 30 cm. + 1 CD-ROM.
Faculty of Mechanical and Automotive Engineering Technology
Thesis (Doctor of Philosophy) -- Universiti Malaysia Pahang – 2020
Includes bibliographical references
Thermo-Electric Generator (TEG) is presently the most pursued thermal energy harvesting technology from waste heat. In spite of that, TEG devices have been used only on a small scale, because of their low conversion efficiency. Heat sink lack of design is one reason that negatively affects the performance of TEG. As compared to conventional cooling systems which use TEG principle, Heat Pipe Heat Sink (HP-HS) has the best performance with TEG. However, the performance of TEG with HP-HS could be affected by geometry, materials and optimization of HP-HS of the TEG cold side, which are still unknown. Thus, the objective of this study is to investigate experimentally the effect of materials, the geometry of HP-HS under outdoor air speed (ODAS) in Kuala Pahang, Malaysia and forced convection (FC) at 250℃ and 300℃ hot side temperatures on the performance of TEG, as well as to optimize the parameters of HP-HS. Experimental and statistical analysis by one-factor-at-a-time method has been done to find out the effects of materials and geometry of HP-HS under ODAS and FC and TEG hot side temperature on the TEG performance. Furthermore multi-objective optimization using response surface methodology (RSM) is applied to determine the optimum geometry of HP-HS and materials in terms of maximizing the TEG power output (P), TEG efficiency (η), and minimizing HP-HS cost ($𝐻𝑃−𝐻𝑆). The Cu HP-HS was found to be preferable over Al for all cases. The fin height has the highest effect for both materials on P and η followed by fin length, and then fin space. It was also found that the TEG performance was better under FC, and at 300℃. Compared with the literature, improvement of η achieved was 40.6 % for ODAS and 23.4 % for FC. Additionally, Cu HP-HS was found to be preferable over Al because of its lower cost per P ($𝑃), at 8.75 USD/W; whilst Al was 10.13 USD/W under ODAS. The cost effectiveness for FC was 7.57 USD/W and 8.74 USD/W for Al. The current research also shows an improvement in HP-HS cost reduction by 17.9 % for ODAS and 29 % for FC, compared with estimated HP-HS cost in the literature. The results found after optimization were unique as they positively indicated that with combined use of HP-HS and TEG as a system, waste heat can be used as a heat source generating clean energy without emitting harmful emissions.
THE0009243(Local)
Faculty of Mechanical and Automotive Engineering Technology--Dissertations
Universities and colleges--Dissertations
Theses
Experimental study and optimization on thermoelectric generator combined with heat pipe-heat sink / Ali Elhade Elghool - xviii, 207 pages : illustrations (some color) ; 30 cm. + 1 CD-ROM.
Faculty of Mechanical and Automotive Engineering Technology
Thesis (Doctor of Philosophy) -- Universiti Malaysia Pahang – 2020
Includes bibliographical references
Thermo-Electric Generator (TEG) is presently the most pursued thermal energy harvesting technology from waste heat. In spite of that, TEG devices have been used only on a small scale, because of their low conversion efficiency. Heat sink lack of design is one reason that negatively affects the performance of TEG. As compared to conventional cooling systems which use TEG principle, Heat Pipe Heat Sink (HP-HS) has the best performance with TEG. However, the performance of TEG with HP-HS could be affected by geometry, materials and optimization of HP-HS of the TEG cold side, which are still unknown. Thus, the objective of this study is to investigate experimentally the effect of materials, the geometry of HP-HS under outdoor air speed (ODAS) in Kuala Pahang, Malaysia and forced convection (FC) at 250℃ and 300℃ hot side temperatures on the performance of TEG, as well as to optimize the parameters of HP-HS. Experimental and statistical analysis by one-factor-at-a-time method has been done to find out the effects of materials and geometry of HP-HS under ODAS and FC and TEG hot side temperature on the TEG performance. Furthermore multi-objective optimization using response surface methodology (RSM) is applied to determine the optimum geometry of HP-HS and materials in terms of maximizing the TEG power output (P), TEG efficiency (η), and minimizing HP-HS cost ($𝐻𝑃−𝐻𝑆). The Cu HP-HS was found to be preferable over Al for all cases. The fin height has the highest effect for both materials on P and η followed by fin length, and then fin space. It was also found that the TEG performance was better under FC, and at 300℃. Compared with the literature, improvement of η achieved was 40.6 % for ODAS and 23.4 % for FC. Additionally, Cu HP-HS was found to be preferable over Al because of its lower cost per P ($𝑃), at 8.75 USD/W; whilst Al was 10.13 USD/W under ODAS. The cost effectiveness for FC was 7.57 USD/W and 8.74 USD/W for Al. The current research also shows an improvement in HP-HS cost reduction by 17.9 % for ODAS and 29 % for FC, compared with estimated HP-HS cost in the literature. The results found after optimization were unique as they positively indicated that with combined use of HP-HS and TEG as a system, waste heat can be used as a heat source generating clean energy without emitting harmful emissions.
THE0009243(Local)
Faculty of Mechanical and Automotive Engineering Technology--Dissertations
Universities and colleges--Dissertations
Theses