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Patil, Mahesh Suresh,Cho, Chong-Pyo,Lee, Moo-Yeon Elsevier 2018 Applied thermal engineering Vol.138 No.-
<P><B>Abstract</B></P> <P>This study used a numerical method to investigate the thermal performance of a 2.0 kW burner in heating the cabin of an electric passenger vehicle. The thermal performance (including temperature distribution, velocity distribution, heat flux, burner efficiency) and fuel performance (including species variation, NOx concentration) with the fuel types, mass flow rates and the inlet temperature were investigated with a numerical simulation using the standard k-ε, RNG k-ε and realizable k-ε turbulence models. The results were validated within 8% that of experimental data obtained by the Korea Institute of Energy Research, Republic of Korea. The standard k-ε turbulence model with the eddy dissipation combustion model showed a close agreement with the experimental data, compared to the RNG k-ε and realizable k-ε turbulence models. As a result, a maximum heat flux of 2171.5 W was observed for butane at a fuel mass flow rate of 0.000057 kg/s and an air inlet temperature of 0 °C. The maximum burner efficiency of 96.7% was observed for methane at a fuel mass flow rate of 0.000030 kg/s and at an inlet air temperature of 0 °C. A minimum NOx concentration of 5.5 ppm was observed for propane at a fuel mass flow rate of 0.000030 kg/s and inlet air temperature of −20 °C. In addition, the butane fuel could be suggested to be effective for the 2.0 kW burner to heat the cabin of an electric passenger vehicle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> EVs have issues on a cabin heating source under cold weather conditions. </LI> <LI> EVs suffer from a short driving range and shortage of cabin heating. </LI> <LI> Thermal performance of 2.0 kW burner for cabin heater of an electric passenger vehicle was investigated. </LI> <LI> The considered burner was investigated under various numerical conditions. </LI> <LI> Suggested burner of 2.0 kW could be used as a cabin heater of an electric passenger vehicle under cold weather conditions. </LI> </UL> </P>
Mahesh Suresh Patil,서재형,이무연 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.1
Thermoelectric generator (TEG) is a promising option in waste heat recovery with various advantages including nonmoving components, very low operating noise and overall high stability. However, low power generation efficiency of TEGs is still concerned for application in wider fields. The objective of the present study is to investigate the parameters affecting the performance and efficiency of segmented TEG. The physical parameters including length ratio, length-to-area ratio and thickness of conducting plate were considered. In addition, the effect of varying hot side temperature was analyzed. Performance of segmented TEG was compared based on the power generation and conversion efficiency. The results of the investigation showed that increasing Bi2Te3 length in the segmented TEG made up of Bi2Te3 and SiGe increased the maximum power generation and efficiency. As length-to-area ratio increased, the power generation decreased, however, efficiency increased slightly. In addition, as the hot side temperature increased from 150 ∘ ∘C to 650 ∘ ∘C, the power generation and efficiency both increased. Power generation and efficiency of segmented TEG increased when the conducting plate thickness was increased. The power generation and efficiency were 39.2% and 51.9% higher for TEG with asymmetrical element than TEG with symmetrical element showing that asymmetrical element would be better option for same thermoelectric element volume.
Gihan Ekanayake,Mahesh Suresh Patil,서재형,이무연 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
This study aimed to numerically investigate the parametric effects of fin geometry on the heat transfer characteristics of 72 V electronic control unit (ECU) heatsink for an electric three-wheeler. The temperature distribution, fin efficiency, and thermal resistance of the 72 V ECU heatsink were compared by varying the fin geometry parameters, including fin thickness, number, height, and depth. The maximum cooling performance was observed for the proposed fin arrangement with a fin thickness of 2.1 mm, fin number of 60, fin height of 16 mm, and fin depth of 8 mm, in comparison with the existing heatsink model. The proposed 72 V ECU heatsink model was validated with the experimental results of the existing heatsink model and indicated a good agreement within ±4.97 %. The optimized ECU heatsink enhanced the heat transfer performance, thereby decreasing the temperatures of the heatsink, capacitor, and metal-oxidesemiconductor field-effect transistor for the proposed 72 V ECU heatsink model by 16.88 %, 12.71 % and 18.95 %, respectively, in comparison with the existing heatsink model.
Seo, Jae-Hyeong,Patil, Mahesh Suresh,Cho, Chong-Pyo,Lee, Moo-Yeon Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.117 No.-
<P><B>Abstract</B></P> <P>The objective of this study is numerically to investigate the heat transfer characteristics of the integrated heating system considering the temperature of cabin and battery of an electric vehicle under the cold weather conditions. The integrated heating system consists of a burner to combust fuel, an integrated heat exchanger for CHE (coolant heat exchanger) and AHE (air heat exchanger). The heat transfer characteristics like the overall heat exchanger effectiveness, the heat transfer rate, the temperature distribution and the fluid flow characteristics like the pressure drop, velocity distribution of the investigated integrated heating system were considered and analyzed by varying the inlet mass flow rates and the inlet temperatures of the cold air and water, respectively. The average Nusselt numbers for the cold air side and the water side were increased 28.4% and 9.5%, respectively, with the increase of the cold air side Reynolds numbers from 15,677 to 72,664 and the water side Reynolds numbers from 4330 to 11,912. The numerical results showed good agreement within ±9.0% of the existed data and thus confirmed that the present model was valid. In addition, the proposed integrated heating system could be used as the thermal management of the cabin and the battery system of the electric vehicle under the cold weather conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> EVs have issues on cabin heating source and battery heating under cold weather. </LI> <LI> EVs suffer from a short driving range and shortage of cabin heating. </LI> <LI> Cabin air heating and battery thermal management for electric vehicle investigated. </LI> <LI> The considered system was investigated under various operating conditions. </LI> <LI> Integrated heating system suggested for cabin heating and battery thermal management. </LI> </UL> </P>