Publicação
Development of a heat exchanger for exhaust gas energy exploitation
| Resumo: | The road transport industry faces the need to develop its fleet for lower energy consumption, pollutants and CO2 emissions. Waste heat recovery systems with Thermoelectric generators (TEGs) can directly convert the exhaust heat into electric energy, aiding the electrical needs of the vehicle, thus reducing its depen dency on fuel energy. The present work assesses the optimization and evaluation of a LaMoTa Uminho temperature-controlled thermoelectric generator (TCTG) concept to be used in a commercial heavy-duty vehicle (HDV). The system consists of a heat exchanger (HE) with wavy fins (WFs) plates in an aluminium matrix along with vapour chambers (VC), machined directly into the matrix, that grant the thermal control. Above are the TEGs and cooling plates (CPs) for heat dissipation. The TCTG concept behaviour was analysed under realistic driving conditions. With a 1D model (Matlab algorithm) of the system was possible to predict its thermal and thermoelectric performance along with the given driving cycles. An HDV with a 16 L Diesel engine was simulated in AVL software. Data regarding the exhaust gas temperature and mass flow were obtained for each point of two cycle runs, which were implemented in the 1D model. Additionally, a 2D heat transfers simulation in COMSOL provided the thermal resistances of the system which were added to the algorithm. The developed system proved to have a good capacity for applications with volatile thermal loads since it was able to avoid the overheating of the TEGs by spreading the heat to areas with lower available thermal loads. It was predicted a maximum average electrical production of 2.4 kW, which resulted in fuel savings of about 2% and CO2 emissions reduction of around 37 g/km. |
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| Autores principais: | Sousa, Carolina Maria Clasen Soares de |
| Assunto: | Heavy-duty vehicles Thermal control Thermoeletric generators Vapour chambers Waste heat recovery systems Câmaras de vapor Controlo térmico Geradores termoeléctricos Sistemas de recuperação de calor residual Veículos pesados |
| Ano: | 2022 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The road transport industry faces the need to develop its fleet for lower energy consumption, pollutants and CO2 emissions. Waste heat recovery systems with Thermoelectric generators (TEGs) can directly convert the exhaust heat into electric energy, aiding the electrical needs of the vehicle, thus reducing its depen dency on fuel energy. The present work assesses the optimization and evaluation of a LaMoTa Uminho temperature-controlled thermoelectric generator (TCTG) concept to be used in a commercial heavy-duty vehicle (HDV). The system consists of a heat exchanger (HE) with wavy fins (WFs) plates in an aluminium matrix along with vapour chambers (VC), machined directly into the matrix, that grant the thermal control. Above are the TEGs and cooling plates (CPs) for heat dissipation. The TCTG concept behaviour was analysed under realistic driving conditions. With a 1D model (Matlab algorithm) of the system was possible to predict its thermal and thermoelectric performance along with the given driving cycles. An HDV with a 16 L Diesel engine was simulated in AVL software. Data regarding the exhaust gas temperature and mass flow were obtained for each point of two cycle runs, which were implemented in the 1D model. Additionally, a 2D heat transfers simulation in COMSOL provided the thermal resistances of the system which were added to the algorithm. The developed system proved to have a good capacity for applications with volatile thermal loads since it was able to avoid the overheating of the TEGs by spreading the heat to areas with lower available thermal loads. It was predicted a maximum average electrical production of 2.4 kW, which resulted in fuel savings of about 2% and CO2 emissions reduction of around 37 g/km. |
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