Study On Exhaust Heat Exchanger For Enhancement Of Thermoelectric Power Generation By CFD
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 5
Abstract
- In recent years with the advancement of thermo-electric materials, direct conversion of heat energy into electrical energy becomes possible. Thermoelectric technology is used for recovering heat energy loses from engine exhaust gases. The power generated by thermoelectric technology is called as thermoelectric power. In thermo-electric power generation an exhaust heat exchanger is used for recovering exhaust heat and a thermoelectric module is used for converting heat into electricity. The present research was aimed to optimize the design of exhaust heat exchanger by removing internal fins and changing the cross-sectional area of heat exchanger to overcome problem of pressure drop. The designs of exhaust heat exchangers considered in the previous research works recovered maximum heat from the exhaust of an engine However problem of pressure drop or back pressure was observed effecting engine performance and working. Higher back pressure can deteriorate and damage engine resulting in stoppage of engine functioning. Computational fluid dynamics (CFD) was used in the simulation of the exhaust gases flowing inside the heat exchanger. The isothermal modelling technique was used in simulation process of the heat exchanger. The thermal simulation is done on heat exchanger to check the surface temperature, heat transfer rate, and pressure drop in three different test conditions (urban driving, suburban driving and max. power driving) of a vehicle with 1.2 L petrol engine. Rectangular shaped heat exchanger was used in exhaust manifold of internal combustion engine (ICE) is modelled numerically to recover the lost heat from engine exhaust. The study revealed that Rectangular shaped heat exchanger with gradually increasing cross sectional area minimized pressure drop and attains higher temperature and heat transfer rate at the surface. The mean surface temperatures obtained after CFD analysis are 458K, 556K, and 790K for the three test conditions. The pressure drop for the three test conditions are 24.14 Pa, 182.5 Pa and 5.413 Kpa and that is within the permissible limits.
Authors and Affiliations
Ajay Kumar, Dr Ajay Singh, Ashish Verma
Keywords
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- EP ID EP438524
- DOI 10.9790/1684-1505017485.
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