What is a heat exchanger?

Suppose you have a gas central heating furnace (boiler) that heats hot-water radiators in various rooms in your home. It works by burning natural gas, making a line or grid of hot gas jets that fire upward over water flowing through a network of pipes. As the water pumps through the pipes, it absorbs the heat energy and heats up. This arrangement is what we mean by a heat exchanger: the gas jets cool down and the water heats up.

A heat exchanger is a device that allows heat from a fluid (a liquid or a gas) to pass to a second fluid (another liquid or gas) without the two fluids having to mix together or come into direct contact. If that's not completely clear, consider this. In theory, we could get the heat from the gas jets just by throwing cold water onto them, but then the flames would go out! The essential principle of a heat exchanger is that it transfers the heat without transferring the fluid that carries the heat.
What are heat exchangers used for?

Geothermal pool heat exchanger.

You can see heat exchangers in all kinds of places, usually working to heat or cool buildings or helping engines and machines to work more efficiently. Refrigerators and air conditioning coils, for example, use heat exchangers in the opposite way from central heating systems: they remove heat from a compartment or room where it's not wanted and pump it away in a fluid to some other place where it can be dumped out of the way.

Photo: A heat pump extracts heat from a natural geothermal hot spring, used to heat buildings at Hot Springs Lodge and Pool in Glenwood Springs, Colorado. The exchanger is the algae-covered plate full of copper tubes in the center of the water. Photo by Warren Gretz courtesy of US DOE/NREL (Department of Energy/National Renewable Energy Laboratory).

In power plants or engines, exhaust gases often contain heat that's heading uselessly away into the open air. That's a waste of energy and something a heat exchanger can certainly reduce (though not eliminate entirely—some heat is always going to be lost). The way to solve this problem is with heat exchangers positioned inside the exhaust tail pipes or smokestacks. As the hot exhaust gases drift upward, they brush past copper fins with water flowing through them. The water carries the heat away, back into the plant. There, it might be recycled directly, maybe warming the cold gases that feed into the engine or furnace, saving the energy that would otherwise be needed to heat them up. Or it could be put to some other good use, for example, heating an office near the smokestack.
In buses, fluid used to cool down the diesel engine is often passed through a heat exchanger and the heat it reclaims is used to warm cold air from outside that is pumped up from the floor of the passenger compartment. That saves the need for having additional, wasteful electric heaters inside the bus. A car radiator is another kind of heat exchanger. Water that cools the engine flows through the radiator, which has lots of parallel, aluminum fins open to the air. As the car drives along, cold air blowing past the radiator removes some of the heat, cooling the water and heating the air and keeping the engine working efficiently. The radiator's waste heat is used to heat the passenger compartment, just like on a bus.

If you have an energy-efficient shower, it might have a heat exchanger installed in the wastewater outlet. As the water drips past your body and down the plug, it runs through the heat exchanger coils. Meanwhile, cold water that's feeding into the shower to be heated pumps up past the same coils, not mixing with the dirty water but picking up some of its waste heat and warming slightly—so the shower doesn't need to heat it so much.


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Not long ago I wrote an interesting piece discussing how all of the kids doing their text message with their fingers was reformatting their brains, and changing the way they think, albeit only slightly. Still, if teenagers spend 10,000 hours every few years doing Raid The Bookies Review text messaging, their brains will reformat due to the dexterity and motor skills they are developing along with the way they think, and due to the fact that they are instantly answering simple questions in their replies and responses to friends, or events which pop up in front of them.

There is of course good and bad in everything, and it might be that they are developing incredible skills for things like operating video games, or perhaps flying unmanned aerial vehicles telerobotically for the United States Air Force. Now then, it would be almost impossible to have a legitimate debate about this topic, or to deem my reasoning incorrect.

After all, we do know the kids that play musical instruments at an early age also tend to format their brains in such a way that they are also better at math, reading symbols, and a different way of thinking. Some would say because of these activities in their younger years they end up with higher IQs, or certain types of reasoning which allows them to answer the questions on IQ tests better than other people. There is some value in that.


Now then, on March 17, 2012 in the Saturday edition of the Wall Street Journal there was an interesting set of articles by Christopher Shea, one of them titled «typists Take Sides,» which stated; «the act of typing may shape how we feel about words, a study suggests.» And the author noted that people which are right-handed can more easily reach the keys on the keyboard such as quotation marks, slash marks, and the question mark much easier than folks that are left-handed — while people that are left-handed are better able to reach the exclamation point, being as they are better with left-handed dexterity.


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Contemporary, with the rapid development of industrial automation, industrial robot has been used in a variety of occasions. In this context, industrial robots gradually replace some of the labor intensity, poor operating environment. China's industrial robot market mainly in the automotive, motorcycles, electrical appliances, construction machinery, petrochemical, etc., Enterprise demand for technological progress is more intense, The main robot users are still in the automotive industry, engineering machinery industry and electrical, electronics industry. China's demand for industrial robots and varieties will increase significantly year by year, some new robots have emerged, which also increased the demand for conductive slip ring.

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1.Conductive slip ring makes the robot internal cable structure has a good order, and convenient to use, maintenance, debugging features, work with the overall layout is reasonable, beautiful.
2.Conductive slip ring using imported materials, stable performance, making the robot has a high life, maintenance-free features. Robot conductive slip ring using the leading military-grade high-standard surface treatment process, compact design, gold to gold contact to ensure that very low contact resistance and long working life, in order to transmit weak signals.
3.Conductive slip ring can improve system performance, simplify the system structure, to avoid the wire in the rotation process caused by sprains.

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