Heat Sink Design for Thermoelectric Generation in Spindle Unit

2013 ◽  
Vol 365-366 ◽  
pp. 285-288
Author(s):  
Sheng Li ◽  
Qing Hui Zeng ◽  
Xin Hua Yao ◽  
Jian Zhong Fu
Keyword(s):  
Heat Sink ◽  
Alternative Energy ◽  
Thermoelectric Generator ◽  
Rotation Speed ◽  
Waste Heat ◽  
Heat Sinks ◽  
Thermoelectric Generation ◽  
Promising Alternative ◽  
Spindle Unit ◽  
Thermoelectric Energy Harvesting

Thermoelectric energy harvesting is emerging as a promising alternative energy source to drive wireless sensors in mechanical, civil, and aerospace engineering systems. Typically, the waste heat from spindle units of machine tools creates obvious potential for thermoelectric generation. The structure of heat sinks on a thermoelectric generator has a great effect on the output voltage of the thermoelectric generator due to the temperature difference between hot and cold sides induced by heat transfer, so several typical structures of heat sinks are studied under different rotation speed of the spindle. According to the simulation study, the thermal resistance of heat sinks was presented. In the experiment, the output voltages of a thermoelectric generator were measured under different rotation speed with different structures of heat sinks. Experiment and simulation shows that the two pipes structure of the heat sink can help the generator to produce more power.

Research on Integration Design of Automobile Waste Heat Thermoelectric Generation Exchanger and Engine Muffler

2014 ◽  
Vol 494-495 ◽  
pp. 51-54
Author(s):  
Jiao Long Xie
Keyword(s):  
Large Scale ◽  
Thermoelectric Generator ◽  
High Efficiency ◽  
Waste Heat ◽  
Thermoelectric Module ◽  
Structural Complexity ◽  
Exhaust System ◽  
Thermoelectric Generation ◽  
Technical Issue ◽  
Structural Integration

The thermoelectric generator (TEG) recovering waste heat from the exhaust has became a potential technical issue, due to its characters of pollution-free, no moving parts, reliability and high efficiency. There exist arrangement on the chassis and the exhaust backpressure of whole system will increase of these two problems, when integrating TEG in the car of TEG and the muffler is to integrate the thermoelectric module on the surface muffler, it can effectively reduce the size of TEG, also reduce its weight and structural complexity. It also reduced the backpressure of TEG, meanwhile solved the compatibility issues with other components of exhaust system. The structural integration laid the foundation to achieve the large-scale use of thermoelectric materials in the car.

Thermoelectric Power Generation by Harvesting the Waste Heat From a Car Engine

2015 ◽  
Author(s):  
Jong K. Cha ◽  
Thomas Y. Lee ◽  
Yong X. Gan
Keyword(s):  
Energy Conversion ◽  
Bismuth Telluride ◽  
Heat Sink ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Electrical Energy ◽  
High Energy ◽  
Coolant Temperature ◽  
Maximum Output ◽  
Maximum Voltage

Internal combustion (IC) engines typically have an efficiency of less than 35%. This is largely due to the fact that much of the energy dissipates into waste heat. However, the waste heat may be converted into electricity by using energy conversion modules made from bismuth telluride. In this work, it is demonstrated that electricity can be generated from waste heat due to the difference in temperatures. The thermal to electrical energy conversion is achieved by using a self-assembled thermoelectric generator (TEG). The TEG (thermoelectric generator) uses two different types of metallic compound semiconductors, known as n-typed and p-typed, to create voltage when the junctions are held at different temperatures. The work mechanism is based on the Seebeck effect. In this study, the TEGs are made from bismuth telluride (Bi-Te) with relatively high energy conversion efficiencies. In addition, it is readily available. The installation location of the TEG is studied. For testing purposes and convenience, the top of the radiator of a 1990 Mazda Miata car was chosen. The TEG and an aluminum finned heat sink were placed in order on the top of the radiator. Thermal paste was applied to both surfaces and secured with zip ties. A vent was cut on the hood of the car to promote airflow between the fins. Appropriate electrical wiring allowed the unit to output to a digital multi-meter which was located within the car for operator to take data. It is found from the measured results that 0.948 V is the maximum output and the average voltage is 0.751 V. The highest voltage came from driving mountain paths due to the heat sink and coolant temperature being higher than nominal. We estimate that placing an insulator between the heat sink and TEG would push the maximum voltage over 1.0 V. During the cool down phase, the TEG produced electricity continuously with a maximum voltage of 0.9 V right after engine cutoff. The voltage decreased to about 0.6 V within 40 minutes. It is found that the relationship between the temperature difference and output voltage is linear.

A Power Management System for Thermoelectric Generators Used on Spindle Units of Machine Tools

2013 ◽  
Vol 365-366 ◽  
pp. 955-958
Author(s):  
Qing Hui Zeng ◽  
Sheng Li ◽  
Xin Hua Yao ◽  
Jian Zhong Fu
Keyword(s):  
Energy Harvesting ◽  
Power Management ◽  
Machine Tools ◽  
Management System ◽  
Experimental Result ◽  
Thermoelectric Generators ◽  
Thermoelectric Generation ◽  
Promising Alternative ◽  
Thermoelectric Energy Harvesting ◽  
Power Management System

Thermoelectric energy harvesting is emerging as a promising alternative energy source for drive wireless sensors in mechanical structure monitoring. Typically, the waste heat from spindle units of machine tools creates obvious potential for thermoelectric generation. However, the problem of power gap between the power level needed by wireless sensor and what thermoelectric generators (TEGs) can provide is likely to arise in the application of thermoelectric generation. Therefore, a power management system (PMS) is needed to accumulate TEG energy first and then drive the load intermittently. This study proposes a power management system to enhance the energy harvesting and usage efficiency using three capacitors. A rotating spindle platform is set up to test the PMS, and the experimental result shows that the proposed PMS worked well when the spindle speed is 3000 rpm.

An Improved Optimization Approach for Thermoelectric Refrigeration Applied to Portable Electronic Equipment

2005 ◽  
Author(s):  
Robert A. Taylor ◽  
Gary L. Solbrekken
Keyword(s):  
Heat Sink ◽  
Waste Heat ◽  
Temperature Drop ◽  
Heat Sinks ◽  
Junction Temperature ◽  
Air Cooling ◽  
Optimization Approach ◽  
Operating Current ◽  
Te Modules ◽  
Module Geometry

The electronics industry has relied heavily on air cooling to dissipate waste heat. Each new generation of technology is smaller and more powerful, pushing the limits of air-cooled heat sinks. A competing constraint is that the thermal solutions need to be smaller and lighter, particularly for portable devices. A viable strategy to extend the limits of air-cooled heat sinks in a mass effective way is thermoelectric (TE) cooling. In general, the limiting COP of currently available TE materials requires that TE modules be operated at near optimum conditions. The conventional approach for optimizing TE modules ignores external irreversibilities, such as the heat sink temperature drop between the TE hot side and the ambient. The current study reviews two schemes for optimizing the operating current and compares their performance. The comparison between the COP maximizing current and the junction temperature minimizing current identifies where the two approaches yield the exact same performance. Performance regimes are then identified where the junction temperature minimizing approach provides an advantage over the COP maximizing approach. A significant extension of the current modeling activity over previous studies is allowing the TE module geometry to be optimized in addition to the operating current. When the TE module geometry is allowed to be optimized, it is found that using TE refrigeration operating at the junction temperature minimizing current will always have a performance benefit relative to a heat sink alone. The way this performance is achieved at higher heat loads is that the TE module elements must be made very thin.

scholarly journals Thermoelectric Generator: A Source of Renewable Energy

2020 ◽  
Vol 3 (1) ◽  
pp. 1-11
Author(s):  
Nicanor Jr Fabracuer ◽  
Reymart Cepe ◽  
Neil Francis Ricafort ◽  
Rhoda Jane Rosal
Keyword(s):  
Alternative Energy ◽  
Fossil Fuels ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Thermoelectric Module ◽  
Dissimilar Materials ◽  
Electrical Current ◽  
Heat Energy ◽  
Seebeck Effect ◽  
Polymer Science

With the natural sources of energy such as fossil fuels is slowly depleting, it became a trend to find new sources of unlimited energy. Renewable source of energy is the best source of unlimited energy for it will be utilizing the resources around like solar, hydro, wind, and many more. One of those newly developed renewable sources utilizes the waste heat developed by individual machines. Since electrical generating machines that use combustion engines generate a considerable amount of waste heat energy from the exhaust gases. Hence, this study focused on waste heat energy harvester by the use of the thermoelectric generator. Thermoelectric power generation is based on a phenomenon called the Seebeck effect. When a temperature difference is established between the hot and cold junctions of two dissimilar materials, a voltage is generated. The heat flow circulation through the semiconductors causes a displacement of charge carriers. A larger delta temperature creates a larger electrical current, ideally, but it is coupled with the fact that a semiconductor is effective only on a temperature range making the thermoelectric generators operational on a limited delta temperature. Primarily, the device was composed of a thermoelectric module mounted on an aluminum plate and placed in an oven. The main objective of the study is to design a circuitry for the thermoelectric generator that aimed to generate a minimum of 20 watts in order to power an AC load. In order to validate the device fabricated, certain measurements needed to be taken during the operation of the prototype. Thus, this device is now a developing source of alternative energy with further studies and innovations for commercial purposes.Keywords: thermoelectric generator, Seebeck effect, semiconductors*The paper has been selected from a collaboration with IPST and 7th ICFCHT 2019 for a conference entitled "Innovation in Polymer Science and Technology (IPST) 2019 in Conjunction with 7th International Conference on Fuel Cell and Hydrogen Technology (ICFCHT 2019) on October 16th - 19th at The Stones Hotel Legian, Bali, Indonesia"

Thermal Behaviors of Passively-Cooled Hybrid Fin Heat Sinks for Lightweight and High Performance Thermal Management

2015 ◽  
Author(s):  
Nico Setiawan Effendi ◽  
Kyoung Joon Kim
Keyword(s):  
Thermal Resistance ◽  
Heat Sink ◽  
High Performance ◽  
Heat Dissipation ◽  
Computational Study ◽  
Heat Sinks ◽  
Channel Diameter ◽  
Internal Channel ◽  
Study Results ◽  
Parametric Effects

A computational study is conducted to explore thermal performances of natural convection hybrid fin heat sinks (HF HSs). The proposed HF HSs are a hollow hybrid fin heat sink (HHF HS) and a solid hybrid fin heat sink (SHF HS). Parametric effects such as a fin spacing, an internal channel diameter, a heat dissipation on the performance of HF HSs are investigated by CFD analysis. Study results show that the thermal resistance of the HS increases while the mass-multiplied thermal resistance of the HS decreases associated with the increase of the channel diameter. The results also shows the thermal resistance of the SHF HS is 13% smaller, and the mass-multiplied thermal resistance of the HHF HS is 32% smaller compared with the pin fin heat sink (PF HS). These interesting results are mainly due to integrated effects of the mass-reduction, the surface area enhancement, and the heat pumping via the internal channel. Such better performances of HF HSs show the feasibility of alternatives to the conventional PF HS especially for passive cooling of LED lighting modules.

scholarly journals Study of Mini Channel Heat Sink with Different Internal Configuration

2020 ◽  
Vol 319 ◽  
pp. 02004
Author(s):  
Muhammad Akif Rahman ◽  
Md Badrath Tamam ◽  
Md Sadman Faruque ◽  
A.K.M. Monjur Morshed
Keyword(s):  
Nusselt Number ◽  
Thermal Performance ◽  
Heat Sink ◽  
Rectangular Channel ◽  
Three Dimensional ◽  
Heat Sinks ◽  
Maximum Temperature ◽  
Rectangular Channels ◽  
Flow Through ◽  
Internal Configuration

In this paper a numerical analysis of three-dimensional laminar flow through rectangular channel heat sinks of different geometric configuration is presented and a comparison of thermal performance among the heat sinks is discussed. Liquid water was used as coolant in the aluminum made heat sink with a glass cover above it. The aspect ratio (section height to width) of rectangular channels of the mini-channel heat sink was 0.33. A heat flux of 20 W/cm2 was continuously applied at the bottom of the channel with different inlet velocity for Reynold’s number ranging from 150 to 1044. Interconnectors and obstacles at different positions and numbers inside the channel were introduced in order to enhance the thermal performance. These modifications cause secondary flow between the parallel channels and the obstacles disrupt the boundary layer formation of the flow inside the channel which leads to the increase in heat transfer rate. Finally, Nusselt number, overall thermal resistance and maximum temperature of the heat sink were calculated to compare the performances of the modified heat sinks with the conventional mini channel heat sink and it was observed that the heat sink with both interconnectors and obstacles enhanced the thermal performance more significantly than other configurations. A maximum of 36% increase in Nusselt number was observed (for Re =1044).

Use of alternative energy sources in protected agriculture

1982 ◽  
Vol 11 (1) ◽  
pp. 16-20 ◽  
Author(s):  
D. Pasternak ◽  
E. Rappeport
Keyword(s):  
Alternative Energy ◽  
Heat Storage ◽  
Waste Heat ◽  
Space Heating ◽  
Energy Sources ◽  
Soil Warming ◽  
Greenhouse Soil ◽  
Geothermal Waters ◽  
Water Curtain ◽  
Alternative Energy Sources

Low temperature energy sources for protected cropping include geothermal waters, waste heat from Industry, and trapped sunshine; application depends on the recovery of heat from circulating warmed water, either via the soil in which the plants are growing or via the air in the greenhouse. Soil warming pipes and ‘water-curtain’ systems of space-heating have shown promise, but heat storage, either for short periods or longer, remains a problem common to all such schemes.

Compact Modeling of Forced Flow in Longitudinal Fin Heat Sinks With Tip Bypass

2003 ◽  
Vol 125 (3) ◽  
pp. 319-324 ◽  
Author(s):  
C. B. Coetzer ◽  
J. A. Visser
Keyword(s):  
Pressure Drop ◽  
Heat Sink ◽  
Heat Sinks ◽  
Compact Model ◽  
Forced Flow ◽  
Compact Modeling ◽  
Transfer Coefficients ◽  
Wide Range ◽  
Laminar And Turbulent Flow ◽  
Improved Accuracy

This paper introduces a compact model to predict the interfin velocity and the resulting pressure drop across a longitudinal fin heat sink with tip bypass. The compact model is based on results obtained from a comprehensive study into the behavior of both laminar and turbulent flow in longitudinal fin heat sinks with tip bypass using CFD analysis. The new compact flow prediction model is critically compared to existing compact models as well as to the results obtained from the CFD simulations. The results indicate that the new compact model shows at least a 4.5% improvement in accuracy predicting the pressure drop over a wide range of heat sink geometries and Reynolds numbers simulated. The improved accuracy in velocity distribution between the fins also increases the accuracy of the calculated heat transfer coefficients applied to the heat sinks.

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