**** you.......... pls somebody answer Double pipe heat exchanger consists of two concentric pipes of different diameters.One pipe is for hot fluid and another is for cold fluid.Both may have same flow direction(COCURRENT) and opposite direction(COUNTERCURRENT). Shell and tube heat exchanger consists of a shell in which large number of parallel tubes are present.One fluid hot or cold flow in shell and other hot or cold flow in the tubes. Also in case of shell & tube(S&T) the hot fluid will have more turbulence than in double pipe heat exchanger (HE) since there are no of tubes within a shell the area for convective heat transfer is considerably increased. so these are much more preferred
Therefore the rate of heat transfer is greater in shell and tube because large surface area and enough contacting time
There are a few techniques to cool something with out turning it into a vaporization. The Peltier effect causes heat to migrate from one side of a junction between two metals to the other if a current is applied. Practically this cause one side to get hot and the other becomes cold. cooling by conduction is another was to cool something. By circulating a cool liquid through a heat exchanger you can cool another stream that come in contact with the heat exchanger. The last method that I can think of is a when stream of compresses gas is blown through an orifice and is subjected to a rapid pressure drop. This is how heat pumps and refrigeration cool their refrigerant but the gas does not have to vaporize for there to be a temperature drop. and prop in pressure in a stream of something will produce a corresponding drop in temperature.
Specific heat of sinter
"Flame" is the visible energy when burning something. "Heat" is given off a flame and countless other things. Flame produces heat, but heat does not always generate from flame, and heat almost never produces flame (friction might count). And if you want the definitions: HEAT: a form of energy that is transferred by a difference in temperature. FLAME: the process of combustion of materials producing heat and light and (often) smoke. If you want to think of it a different way: Flame is what you see when you look at a fire and heat if what you feel from the fire.
A heat sink is usually something that draws something away from an electrical componet (Ex: ICU's, Processors and transistors) APEX- A device that absorbs and draws heat from a hot object, dispersing it into the surroundings.
In a active heatsink system you have both a heatsink and a fan thus for the most part an active heatsink cools better with one exception. Should the fan fail the active heatsink will quickly overheat. Passive heatsinks relay on transferring heat without the aid of a fan. The advantage here is that a passive heatsink is fail proof and uses 0 electricity, however passive heatsinks don't typical cool as well. Passive heatsinks work great for supporting chips and RAM cooling. They are also found in servers because of the no fail aspect. EnzoTech produces some passive heatsinks you can read a bit more about them here: http://electricalninja.com/
double pipe heat exchanger is made if two concentric tubes one carrying cold flow and the other one carrying hot flow. but shell and tube hear exchangers are made of a shell like a vessel filled with many thin tubes to transfer heat between fluids. there are more data available at : http://scopewe.com/double-pipe-heat-exchanger-design-part-1/
The factors that are affected by number of tubes in shell and tube heat exchanger is the rate of heat transfer and flow rate.
It's the flat, flanged cover on the front (and sometimes the rear) of a shell & tube heat exchanger.
the most effective way to do so is to reduce the flow of the heat exchanger
increase to heat transfer coefficent
To passivate an exchanger gently pat the shell while whispering into a bleeder
A heat exchanger with straight tubes in a shell that can normally be mechanically cleaned
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Antony Johnson has written: 'Flow, heat transfer and pressure drop on the shell side of a shell and tube heat exchanger'
The assumption to design heat exchanger is that it must be a shell and tube device. This device must allow the transfer of heat from one fluid to another without mixing the two fluids.
The hydro-testing procedure of a shell and tube heat exchanger requires you to fill the shell and tubing with water that had a color dye added to it. Then, raise the internal pressure by 1.5 times the operating pressure suggested by the manufacturer. If there are any cracks in the vessel, the water will be forced out through the cracks.
I'm just concluding a work in which I had to design a shell and tube exchanger for condensation of a mixture of gases and vapor at low pressure. That was the type I chose. AEM is a type of shell and tube heat exchanger, according to TEMA standards. They use 3 letters to describe the configuration of the heat exchanger. First letter refers to the front head, second letter to the shell type and third letter to the rear end stationary head. So in this case, with a type A you would have: A for channel and easily removable cover. E as it is a one pass shell and M because you have a fixed tubesheet with a rear end in bonnet shape.