heat exchangers for heavy vehicles utilizing high thermal conductivity graphite

Graphite Foam for Cooling of Automotive Power Electronics

This high conductivity combined with the very high specific surface area results in overall heat transfer coefficients for foam-based heat exchangers that are up to two orders of magnitude greater than those of conventional heat exchangers. As a result, graphite

Heat Exchangers for Heavy Vehicles Utilizing High Thermal

The U.S. Department of Energy's Office of Scientific and Technical Information article{osti_770964, title = {Heat Exchangers for Heavy Vehicles Utilizing High Thermal Conductivity Graphite Foams}, author = {James Klett, Ron Ott and McMillan, April}, abstractNote = {Approximately two thirds of the world's energy consumption is wasted as heat.

Silicon Carbide Heat Exchangers

For the processing of highly abrasive or oxidizing media, free halogens and extremely aggressive solvents, we offer a high end product line of silicon carbide (SiC) heat exchangers. SiC is one of the hardest materials available. Combined with a high thermal

High Thermal Conductivity Graphite Foams for Compact

May 9, 2002 High Thermal Conductivity Graphite Foams for Compact Lightweight Radiators Dr. James Klett Metals and Ceramics Division P.O. Box 2008, Oak Ridge National Laboratory Oak Ridge, Tennessee, 37831-6087 (865) 574-5220 klettjwornl.gov

Plastics That Conduct Heat

Heat sinks and other heat-removal applications are among the last areas where thermoplastics—inherent thermal insulators—have yet to replace metals. Until fairly recently, that is. Modifying plastics to improve their thermal conductivity is a burgeoning area of opportunity for a handful of compounders.

How Does Graphite Affect Conductivity of Geothermal

Because graphite has such a very high thermal conductivity potential and because we use so little in each batch, any variation in dosage can have dramatic effects on the measured TC values. Modifying the water content by as little as one gallon per batch can modify the TC values by roughly 15 percent.

Graphite Foam Heat Sinks

2021/4/19The high thermal conductivity of Pyroid HT allowed the customer to reduce the overall heat sink footprint by using a similar fin design but much lower number of fins. By using the Pyroid HT heat spreader, the customer increased the reliability and longevity of the power device offering significant savings in board replacement costs.

Heat exchanger assembly utilizing grommets and

Heat exchangers, particularly those utilized in motor vehicles, may be liquid-to-air heat exchangers, (e.g., radiators for engine coolant, air conditioning condensers and evaporators, and oil coolers) or may be air-to-air heat exchangers (e.g. charge air coolers).

SHELL AND TUBE HEAT EXCHANGER

Due to their design, shell tube heat exchangers offer a large heat transfer area and provide high heat transfer efficiency. 4.3(e) U-TUBE HEAT EXCHANGER In nuclear power plants called pressurized water reactors, large heat exchangers called steam generators are two-phase, shell-and-tube heat exchangers which typically have U-tubes.

Heat Exchangers for Heavy Vehicles Utilizing High Thermal

2000/6/19Heat Exchangers for Heavy Vehicles Utilizing High Thermal Conductivity Graphite Foams 2000-01-2207 Approximately two thirds of the world's energy consumption is wasted as heat. In an attempt to reduce heat losses, heat exchangers are utilized to recover some of the energy.

US Patent for Hybrid metal

A heat exchanger includes a metal tube and a composite polymer fin in thermal contact with the metal tube. The fin is formed of a polymer and a thermally conductive filler such that the fin has a thermal conductivity greater than or equal to 0.5 Watts per meter Kelvin.

Modeling the overall heat conductive and convective properties of open

In the case of graphite foam, the thermal conductivity of graphite strut, k sl, is given by (Klett 1999) k sl =−284.44ln(T)+2344.6, (12) where T is the temperature in Kelvin and k sl is expressed in Wm−1 K−1. The conductivity of air used for k g is given by (Vargaftik

GRAPHITE – TalcAsia

GRAPHITE Graphite has a wide variety of properties and uses. Prized for its electrical conductivity, thermal conductivity, softness, chemical inertness, heat resistance and lubricity. Its applications range from high performance lithium-ion batteries, alkaline batteries

High temperature heat exchanger studies for

In terms of high temperature, high pressure and the thermal stress capability, tubular heat exchanger is advantageous albeit their relatively lower effectiveness. As a result, the primary surface heat exchanger can be suggested for the intercooler application, while the tubular type is suitable for the other heat exchangers.

Plastic That Conduct HEAT.

2001/6/1Heat sinks and other heat-removal applications are among the last areas where thermoplastics--inherent thermal insulators--have yet to replace metals. Until fairly recently, that is. Modifying plastics to improve their thermal conductivity is a burgeoning area of opportunity for a handful of compounders.

Modeling and Performance Analysis of Alternative Heat Exchangers for Heavy Vehicles

material, graphite foam having high thermal conductivity (1700 W/(mK)) and low density (0.2 to 0.6 g/cm3), is introduced as a potential material for heat exchangers in vehicles. In order to find an appropriate configuration of fins with high thermal performance

Modeling the overall heat conductive and convective properties of open

In the case of graphite foam, the thermal conductivity of graphite strut, k sl, is given by (Klett 1999) k sl =−284.44ln(T)+2344.6, (12) where T is the temperature in Kelvin and k sl is expressed in Wm−1 K−1. The conductivity of air used for k g is given by (Vargaftik

Heat exchanger assembly utilizing grommets and

Heat exchangers, particularly those utilized in motor vehicles, may be liquid-to-air heat exchangers, (e.g., radiators for engine coolant, air conditioning condensers and evaporators, and oil coolers) or may be air-to-air heat exchangers (e.g. charge air coolers).

A review on application of carbonaceous materials and carbon matrix composites for heat exchangers and heat

Heat exchangers based on high thermal conductivity graphite foam, Proceedings of the 1st World Conference on Carbon, Berlin, Germany, July 9-15. Klett, J., 2000. Racing radiators utilizing ORNL's graphic foam, Department of Energy, Washington, DC, Report

A performance analysis of porous graphite foam heat

2013/1/10Due to the high thermal conductivity, the graphite foam is considered as a potential candidate material for heat exchangers in vehicles. However, the high pressure drop is a major issue blocking the development of graphite foam heat exchangers.

High

article{osti_940253, title = {High-Conductivity Graphite Foams for Thermal Control in Heavy Vehicles}, author = {Armstrong, B. L. and McMillan, A. D. and A., Walls C. and Henry, J. J. and Sklad, P. S.}, abstractNote = {A novel technique for creating pitch-based graphite foam was developed at Oak Ridge National Laboratory (ORNL), This technique utilizes mesophase pitch as a starting material

Heat Sinks and Process Cooling

Heat Sink Materials There are multiple factors to consider when choosing a heat sink material. First and foremost, is the material's ability to transfer heat (thermal conductivity), density, and of course cost. Heat sinks are typically made from aluminum or copper

Modelling and Simulation in Materials Science and Engineering

In the case of graphite foam, the thermal conductivity of graphite strut, k sl, is given by (Klett 1999) k sl =−284.44ln(T)+2344.6, (12) where T is the temperature in Kelvin and k sl is expressed in Wm−1 K−1. The conductivity of air used for k g is given by (Vargaftik

A Critical Review on Applications of Nano

heat exchangers. Constant technological development in automotive industries has increased the demand for high efficiency engines. Because of their excellent thermal performance, Nanofluids have attracted attention as a new generation of heat transfer fluids

Design of a Thermoelectric Generator for Waste Heat

2017/5/1Furthermore, the fluids should have a high thermal conductivity, which enables that heat is easily pulled, or released, to and from the media. There are four significant fluid streams that are possible to use as heat sources in a modern heavy vehicle: Exhaust Gas

High temperature heat exchanger studies for

In terms of high temperature, high pressure and the thermal stress capability, tubular heat exchanger is advantageous albeit their relatively lower effectiveness. As a result, the primary surface heat exchanger can be suggested for the intercooler application, while the tubular type is suitable for the other heat exchangers.

A performance analysis of porous graphite foam heat

2013/1/10Due to the high thermal conductivity, the graphite foam is considered as a potential candidate material for heat exchangers in vehicles. However, the high pressure drop is a major issue blocking the development of graphite foam heat exchangers.

Nanomaterials

Heat exchangers are key components in many of the devices seen in our everyday life. They are employed in many applications such as land vehicles, power plants, marine gas turbines, oil refineries, air-conditioning, and domestic water heating. Their operating mechanism depends on providing a flow of thermal energy between two or more mediums of different temperatures. The thermo-economics

Plastics That Conduct Heat

Heat sinks and other heat-removal applications are among the last areas where thermoplastics—inherent thermal insulators—have yet to replace metals. Until fairly recently, that is. Modifying plastics to improve their thermal conductivity is a burgeoning area of opportunity for a handful of compounders.

Water cooling

Water's high enthalpy of vaporization allows the option of efficient evaporative cooling to remove waste heat in cooling towers or cooling ponds. Recirculating systems may be open if they rely upon evaporative cooling or closed if heat removal is accomplished in heat exchangers with negligible evaporative loss.

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