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Shell and Tube Heat Exchanger by Varalakshmi
A Heat Exchanger is a device built for efficient heat transfer from one medium to another. A solid wall separates the media, so that they never mix, or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, and natural gas processing.
A Shell and Tube Heat Exchanger is a class of heat exchanger designs. It is the most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higher-pressure applications. As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids. The set of tubes is called a tube bundle, and may be composed by several types of tubes: plain, longitudinally finned, etc.
Heat is transferred from one fluid to the other through the tube walls, either from tube side to shell side or vice versa. The fluids can be either liquids or gases on either the shell or the tube side. In order to transfer heat efficiently, a large heat transfer area should be used, leading to the use of many tubes. In this way, waste heat can be put to use. This is an efficient way to conserve energy.
Shell and the tube heat exchangers in their various construction modifications are probably the most widespread and commonly used basic heat exchanger configuration in the process industries. The reasons for this general acceptance are several. The shell and tube heat exchanger provides a comparatively large ratio of heat transfer area to volume and weight. It provides this surface in a form which is relatively easy to construct in a wide range of sizes and which is mechanically rugged enough to withstand normal shop fabrication stresses, shipping and field erection stresses, and normal operating conditions. The shell and tube exchanger can be reasonably easily cleaned, and those components most subject to failure gaskets and tubes can be easily replaced.
The author is associated with IPFonline
http://www.ipfonline.com is India's No. 1 Industrial Product Finder. The portal is a veritable storehouse of information on industrial products/services.
Article Source: http://www.earticlesonline.com/Article/Shell-and-Tube-Heat-Exchanger/852307
3.00-4 solid inner tube or tire for go-ped?
hey, i have a little 50cc gas scooter, with 10x3" OR 3.00-4 tires/tubes... i must have gone through 5 tubes and 2 sets of tires since i bought this and about fed up with ordering them :/ do they make a SOLID inner tube or tire for this model? if so where? this is the tire/tube set it uses
http://www.monsterscooterparts.com/3126scti.html
(the tubes don't hold up well at all and the tires are poorly made, most my problems are with the tire puncturing the inner tube)
thanks,
Gabe
Im the only real answer your gonna get, the gas scooter market isnt big anough for people to know this kind of question. i have owned 2 scooters. a 35cc 4 stroke and a 52cc 2 stroke. i have seen and done everything related to gas scooters. my 35cc has been around for 7 years now and still runs like new. the 52cc has had $2k dumped into it and the mods list is: high compression head, x-pipe, high performance filter, e3 spark plug, dual intake boost induction bottles, race gas, octane booster. im sure the thing started as 2 hp and ended up at around 12. its a monster. i once had a pocket bikes cvt transmission on it and i was clocked by a car next to me doing 50mph. stock is 20. the power of the engine eventually ate through 3 cvt's at $100 apiece. so now that youve heard my story, can you believe me beyond a doubt that there are no solid rubber tires available? the best website i found in my years is www.pocketbikeparts.com, if i happen to be wrong about the tire, its cuz this website just got it in. ask...
