Power Generation, Efficiency and Thermal Stress of Thermoelectric Module with Leg Geometry, Material, Segmentation and Two-Stage Arrangement

Lee, Moo‐Yeon; Seo, Jae-Hyeong; Lee, Hoseong; Garud, Kunal Sandip

doi:10.3390/sym12050786

Cited by 36 publications

(18 citation statements)

References 33 publications

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“…To analyze the heat transfer characteristics of water and nanofluids, the tube under constant heat flux condition is simulated in ANSYS commercial software. The meshing with tetrahedron mesh elements and five different sizes is generated for the considered computational domain to show the mesh independency of the simulated results [31]. The Nusselt number and friction factor are simulated for five different mesh element numbers ranging from 100,000 to 700,000.…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Garud

Lee

2021

Symmetry

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In the present study, the heat transfer characteristics, namely, heat transfer coefficient, Nusselt number, pressure drop, friction factor and performance evaluation criteria are evaluated for water, Al2O3 and Al2O3/Cu nanofluids. The effects of Reynolds number, volume fraction and composition of nanoparticles in hybrid nanofluid are analyzed for all heat transfer characteristics. The single particle and hybrid nanofluids are flowing through a plain straight tube which is symmetrically heated under uniform heat flux condition. The numerical model is validated for Nusselt number within 7.66% error and friction factor within 8.83% error with corresponding experimental results from the previous literature study. The thermophysical properties of hybrid nanofluid are superior to the single particle nanofluid and water. The heat transfer coefficient, Nusselt number and pressure drop show increasing trend with increase in the Reynolds number and volume fraction. The friction factor shows the parabolic trend, and the performance evaluation criteria shows small variations with change in Reynolds number. However, both friction factor and performance evaluation criteria have increased with increase in the volume fraction. The 2.0% Al2O3/Cu with equal composition of both nanoparticles (50/50%) have presented superior heat transfer characteristics among all working fluids. Further, the heat transfer characteristics of 2.0% Al2O3/Cu hybrid nanofluid are enhanced by changing the nanoparticle compositions. The performance evaluation criteria for 2.0% Al2O3, 2.0% Al2O3/Cu (50/50%), 2.0% Al2O3/Cu (75/25%) and 2.0% Al2O3/Cu (25/75%) are evaluated as 1.08, 1.11, 1.10 and 1.12, respectively.

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Section: Methodsmentioning

confidence: 99%

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Garud

Lee

2021

Symmetry

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“…To reduce overdependence on fossil fuels and minimize their impact on the environment which manifests as pollutant emissions, Woolley et al [4] noted that manufacturers should prioritize on the use of renewable energy systems or the reduction of energy consumption using WHR techniques. WHR using available technologies can provide valuable energy sources, thus improving overall energy efficiency [6,8]. In food processing industries, large quantity of waste heat is dumped into the environment during production activities, which has a significant effect on both energy costs during production and the price of finished products.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Profile of a Crop Dryer Powered by Generator Exhaust Gas Waste Heat

Ononogbo¹,

Nwufo²,

Nwaji³

et al. 2022

International Journal of Advanced Science and Engineering

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The thermal profile of an exhaust gas waste heat recovery (WHR) crop dryer is presented. The dryer uses a parallel flow heat exchanger to recover the exhaust gas waste heat of a diesel engine generator for the drying of food crops. No-load tests of the assembled test rig were conducted to study the temperature profile and heat transfer rates in the dryer at varying inlet ambient air velocities. The results of the no-load tests revealed that the higher the airspeed through the WHR heat exchanger, the faster the rate of heating of the drying chamber. It was observed that the drying chamber initially at 32.3℃, was heated to a maximum temperature of 116.1 ℃ after only a period of 39 min at an air velocity of 2 m/s. The values of the heat transfer rate obtained at selected drying chamber temperatures showed that the higher the drying chamber temperature, the lower the value of the heat transfer rate. The dryer was successfully used to dry freshly harvested maize grains and blanched yam samples at varying drying air temperatures and velocities. The results obtained will be very useful in the design and development of eco-friendly commercial dryers powered by recovered waste heat from available sources.

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“…In the present time, energy saving methods and techniques in various industries are very important to prevent the global energy crisis, increasing fuel consumption and oil price and decrease the fossil fuel energy use [1]. Especially, the uses of the fossil fuels have caused the ozone layer depletion and the ecological problems including the global warming and air pollution.…”

Section: Introductionmentioning

confidence: 99%

Energy Saving and Economic Evaluations of Exhaust Waste Heat Recovery Hot Water Supply System for Resort

et al. 2021

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The objective of this study is to investigate the energy savings and economics of the hot water supply system for the luxury resort. The hot water was generated using the waste heat from the exhaust gas heat (EGH) of internal combustion engine (ICE) installed at the luxury resort. The capacity and characteristics of waste heat source, flow demand and supply system of hot water were surveyed, and data is collected from the real system. The new heat exchanger system which utilizes the EGH to produce the hot water is designed considering the dew point temperature and the back pressure of exhaust gas system. The results show that the proposed system could supply hot water at a temperature of 55 °C corresponding to the present resort demand of 6 m3/h using EGH of ICE at 20% load. The proposed system could achieve the saving of 400 L/day in diesel oil (DO) fuel consumption and the payback time of new system could be evaluated as 9 months. The proposed system could produce hot water of 14 m3/h at 25% of engine load and 29 m3/h at full engine load which are sufficient to satisfy the regular and maximum hot water demand of resort. The presented results show the capability of the proposed system to satisfy the current hot water demand of resort and suggest the larger potential to save energy by recovering EGH of ICE. The novelty of the present work involves detailed methodology to design heat exchangers and evaluate system economics for hot water supply system based on EGH of ICE.

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Power Generation, Efficiency and Thermal Stress of Thermoelectric Module with Leg Geometry, Material, Segmentation and Two-Stage Arrangement

Cited by 36 publications

References 33 publications

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Investigation of the Thermal Profile of a Crop Dryer Powered by Generator Exhaust Gas Waste Heat

Energy Saving and Economic Evaluations of Exhaust Waste Heat Recovery Hot Water Supply System for Resort

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