Science Articles & Inventions Online » AIR FIRE HEAT

CIRCUIT BOARD BONDING AGENT WITH HIGH THERMAL QUALITIES

Editor — Fri, 04 Jun 2010 19:14:27 +0000

One-Part Adhesive Has High Thermal Conductivity

Master Bond Supreme 10AOHT is a single-component epoxy adhesive with high thermal conductivity and excellent electrical insulation properties. It exhibits high shear and peel strength. Supreme 10AOHT requires no mixing and cures at elevated temperatures. It has a service operating temperature range of –300°F to +400°F. Bonds are resistant to impact, vibration, thermal shock, and stress fatigue cracking. Supreme 10AOHT is 100% reactive and does not contain any solvents or diluents.

More Information

Sourced and Published by Henry Sapiecha 5th June 2010

HYDROGEN PEP PILLS FOR YOUR CAR. YOUR CAR WILL GO FURTHER AND FASTER

Editor — Thu, 08 Apr 2010 15:04:05 +0000

Danish Researchers Reveal New

Hydrogen Storage Technology

ScienceDaily (Sep. 8, 2005) — Scientists at the Technical University of Denmark have invented a technology which may be an important step towards the hydrogen economy: a hydrogen tablet that effectively stores hydrogen in an inexpensive and safe material.

With the new hydrogen tablet, it becomes much simpler to use the environmentally-friendly energy of hydrogen. Hydrogen is a non-polluting fuel, but since it is a light gas it occupies too much volume, and it is flammable. Consequently, effective and safe storage of hydrogen has challenged researchers world-wide for almost three decades. At the Technical University of Denmark, DTU, an interdisciplinary team has developed a hydrogen tablet which enables storage and transport of hydrogen in solid form.

“Should you drive a car 600 km using gaseous hydrogen at normal pressure, it would require a fuel tank with a size of nine cars. With our technology, the same amount of hydrogen can be stored in a normal gasoline tank”, says Professor Claus Hviid Christensen, Department of Chemistry at DTU.

The hydrogen tablet is safe and inexpensive. In this respect it is different from most other hydrogen storage technologies. You can literally carry the material in your pocket without any kind of safety precaution. The reason is that the tablet consists solely of ammonia absorbed efficiently in sea-salt. Ammonia is produced by a combination of hydrogen with nitrogen from the surrounding air, and the DTU-tablet therefore contains large amounts of hydrogen. Within the tablet, hydrogen is stored as long as desired, and when hydrogen is needed, ammonia is released through a catalyst that decomposes it back to free hydrogen. When the tablet is empty, you merely give it a “shot” of ammonia and it is ready for use again.

“The technology is a step towards making the society independent of fossil fuels” says Professor Jens Nørskov, director of the Nanotechnology Center at DTU. He, Claus Hviid Christensen, Tue Johannessen, Ulrich Quaade and Rasmus Zink Sørensen are the five researchers behind the invention. The advantages of using hydrogen are numerous. It is CO2-free, and it can be produced by renewable energy sources, e.g. wind power.

“We have a new solution to one of the major obstacles to the use of hydrogen as a fuel. And we need new energy technologies – oil and gas will not last, and without energy, there is no modern society”, says Jens Nørskov.

Together with DTU and SeeD Capital Denmark, the researchers have founded the company Amminex A/S, which will focus on the further development and commercialization of the technology.

Sourced and published by Henry Sapiecha 9th April 2010

THE SUPER-SUPER HIGH TEMPERATURE ADHESIVE TO 3,000 DEGREES

Editor — Wed, 24 Mar 2010 21:54:28 +0000

Resbond™ Alumina Adhesive Protects Electronic Components to 3000º F Resbond™ 989 offers continuous protection to 3000°F.

Apply directly to metals, glass, ceramics, graphite and silicon carbide. Cures at room temp., provides high bond strength and excellent electrical, moisture, chemical and solvent resistance for bonding and sealing heaters, heating elements, resistors, instrumentations, strain gauges, electrical feed thrus, optical fibers, etc. You have challenging applications… we have solutions. More Information

Sourced and published by Henry Sapiecha 25th March 2010

NEWER MORE EFFICIENT AIR CONDITIONER SYSTEM

Editor — Tue, 08 Sep 2009 11:15:20 +0000

“Create the Future” Sustainable

Technologies Category Winner

The 2008 NASA Tech Briefs “Create the Future Design Contest,” presented by SolidWorks, recognized innovation in product design in six categories: Consumer Products, Machinery & Equipment, Medical, Safety & Security, Sustainable Technologies, and Transportation. Here is the winner of the Sustainable Technologies category, along with the two honorable mentions.

Efficient Air Conditioner

Lindsay Meek
Perth, Australia

This design improves the energy efficiency of a residential air conditioner by replacing the traditional reciprocating compressor (bore and stroke) with a higher efficiency permanent magnet motor coupled to a scroll compressor. Recent advances in permanent magnet motors used in modern hybrid car electric drives and wind turbine generation have seen the incorporation of strong NdFeB magnets into the rotor, which greatly improves the motor efficiency. The compressor motor is then driven by a compact IGBT inverter stage with a motor controller, so motor current consumption can be optimized at the different operating speeds.

The other improvement that can be made is to replace the traditional refrigerant expansion valve with a similar scroll expander turbine coupled to a second permanent magnet generator. The decompression of the refrigerant gas through the turbine on its way to the condenser allows some of the work used to compress the gas to be recovered and converted back into electrical energy. The generator is connected to a second compact IGBT inverter stage with a motor controller, and can be controlled in conjunction with the compressor motor controller to regulate the pressure and flow rate of the gas through the system.

The two inverters are connected together via a common, high-voltage DC bus, so the electrical energy recovered from the decompression state can be reused by the compression stage, improving the overall efficiency of the refrigeration cycle. Finally, an AC-DC rectifier power supply is needed to provide the main work energy for the DC bus to keep the cycle operating. The above improvements should lower the power consumption by at least 30%.

For more information, contact the inventor at lindsaymeek@hotmail.com

Sourced and published by Henry Sapiecha 8th Sept 2009