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ammonia as a refrigerant full report


Posted by: seminar presentation
Created at: Saturday 08th of May 2010 03:24:39 PM
Last Edited Or Replied at :Saturday 08th of May 2010 03:24:39 PM
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processing and preservation, as well as many other refrigeration and airconditioning processes. Ammonia has desirable characteristics as a refrigerant, which have been well known for over a century. It is corrosive and hazardous when released in large quantities. Because of its irritating odor, persons will not voluntarily stay near concentrations that are health threatening. Although ammonia will burn in a narrow range of high concentrations, it is difficult to ignite and will not support combustion after the ignition source is withdrawn.


read full report
http://www.ashrae.org/docLib/..................[:=> Show Contents <=:]



Hydrogen Vehicle


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:29:25 PM
Last Edited Or Replied at :Friday 31st of December 2010 12:01:55 AM
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st (and very little nitrogen oxides from the nitrogen in the air when burning at high temperatures). We could move the source of atmospheric pollution from many cars, back to a single power plant, where it can be more easily dealt with. That would mean that we would accept the transmission line loses and inefficiencies of separating our own hydrogen and compressing it ourselves. We could do better now by using a Plug-in hybrid electric vehicle, that is far more feasible. There are no hydrogen cars current, or anticipated, which use the fusion of hydrogen as a power source.

The major challen..................[:=> Show Contents <=:]



Underwater welding


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:26:02 PM
Last Edited Or Replied at :Tuesday 05th of February 2013 12:10:15 AM
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0 m are ongoing. In general, assuring the integrity of underwater welds can be difficult, especially wet underwater welds, because defects are difficult to detect.

For the structures being welded by wet underwater welding, inspection following welding may be more difficult than for welds deposited in air. Assuring the integrity of such underwater welds may be more difficult, and there is a risk that defects may remain undetected.

The risks of underwater welding include the risk of electric shock to the welder. To prevent this, the welding equipment ought to be properly insulated, and the..................[:=> Show Contents <=:]



Solar Ponds


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:19:37 PM
Last Edited Or Replied at :Friday 22nd of April 2011 02:55:23 PM
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s, its construction, working and the problems encountered in its operation. Some aspects of heat extraction from solar pond and its application have also been discussed. Solar pond technology has made considerable progress in the last fifteen years. The salinity gradient solar ponds are found to be more popular for collecting and storing solar energy. This device is found to be cost effective for low temperature process heat needs of industry. The major limitation is that temperature cannot exceed 950c. The generation of electricity using solar ponds is not economically viable yet. When higher..................[:=> Show Contents <=:]



Noval Valveless micropump


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:16:18 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:16:18 PM
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ump with check valves. The peristaltic micropump can generate forward and backward flows by changing working sequence of three actuators. However, the peristaltic micropump needs at least three pumping chambers and actuators, which are not suitable for miniaturization.

In this seminars, a new valveless micropump for bidirectional use has been presented, the designing ,fabrication and testing also described. Since there are no valves, this pump is expected to be free from wear, fatigue and clogging problems. Moreover, this pump can be made in a simple design, which is helpful for miniatu..................[:=> Show Contents <=:]



Plastic Welding


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:07:35 PM
Last Edited Or Replied at :Saturday 02nd of March 2013 03:38:10 AM
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World War. In plastic welding smaller components are welded together to form complex structures. These structures include installation of process lines vent pipes, containers etc.. Enhanced application of plastics to more and more construction works demanded better fabrication techniques. Conventional methods were castings and die-casting of plastics. But cost of moulds, dies and other accessories for these types of fabrication showed a proportional increase with the size of structure being made. In fact the construction methods started to overshoot the material cost.
Plastic wel..................[:=> Show Contents <=:]



Selective Catalytic Reduction SCR


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:03:37 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:03:37 PM
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Reduction (SCR), a process where a gaseous or liquid reductant (most commonly ammonia or urea) is added to the flue gas stream and is absorbed onto a catalyst. The reductant reacts with NOx in the flue gas to form H2O and N2.

Specialty Catalytic Converters are required to make an SCR system work, the current options being a Vanadium based catalyst, or a catalyst with Zeolites in the washcoat. In some jurisdictions use of a Vanadium based catalyst are frowned on (California) and the Zeolite type preferred, however Vanadium offers better performance.

SCR catalysts function well only within..................[:=> Show Contents <=:]



BlueTec


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:33 AM
Last Edited Or Replied at :Friday 24th of May 2013 08:39:36 AM
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icles 45-state and 50-state legal respectively in the United States, and is expected to meet all emissions regulations through 2009. It also makes DaimlerChrysler the only car manufacturer in the the US committed to selling diesel models in the 2007 model year...................[:=> Show Contents <=:]



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