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Why most of the heat exchangers are made use of forced convection?
Janho
Better heat transfer than natural convection. When compared to water or liquid cooled heat exchangers, the argument could be made that air is a cheaper cooling medium.
Wiki User
∙ 15y ago
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What is the difference between double pipe heat exchanger and shell and tube heat exchanger?
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/
Heat exchangers can be found in what systems?
furnance Applications of finned tube heat exchangers embody Steam air heater / steam radiator, energy fluid air heater / energy fluid radiator, predicament air heater / predicament radiator, Air heater for spray dryers, Air heater for fluid bed dryer, Air heater for flash dryers and Air heater for dryers. These area unit factory-made exploitation high grade steel, stainless-steel, copper, brass and metal. Our Finned Tube Heat exchangers area unit designed to satisfy the particular temperature, heavy duty condition and pressure of the fluids. Fin tubes,tubos aletados, acero inoxidable, Stainless Steel 304, Aluminum,Finned tube,Brass tube, Valve & Pipe Fitting Supplier at http://www.ts-aceroinoxidable.com
How has the microwave oven been improved since 1946?
Other than aesthetics, the biggest changes have been the sources used for the heat. They've gone from wood, to coal, to gas, to electricity, to microwaves, to convection. With each change in heat source, safety has been improved as well as insulation and efficiency.
What are manufactured boards?
Manufactured Boards are man-made boards and are made by applying heat and pressure.The boards are made up of layers which are glued together and compressed with a huge amount of heat and pressure. Manufactured boards are made up of layers which are made of little chips of wood glued together.KINDS OF MANUFACTURED BOARD:PlywoodMDFBlock BoardChipboardWafer BoardHard Board
How is a cyringe made?
It is made up of a hollow needle, which is attached to a tube and a plunger. When the plunger handle is pulled back, fluids are drawn into the tube. The fluid is forced out through the needle when the handle is pushed down.
What is the Difference in normal convection and forced convection?
Forced convection is forced [man-made] and normal convection is natural.
Describe the process of convection?
Convection is caused by temperature differences, in a gas such as air, which affect the gas density in local areas thus causing movement of the gas, generally upward due to buoyancy of warmer gas compared to the average density. Thus heat from a heating element near the floor of a room can be spread through the room without any forced circulation.
What are the different types of heat exchangers available today?
There are three main types of heat exchangers on the market today. Type 1, Brazed Heat Exchangers, are a collection of plates, vacuum brazed together with no gaskets. They have a high turbulent flow, which reduces particle build up and the need for maintenance. They are good for water based systems such as radient floor heating and swimming pools. Type 2, Shell and Tube Heat Exchangers, are copper U-tubes in a carbon shell. They are rugged, and are frequently used when the materials being cooled are corrosive. Type 3, Shell and Coil Heat Exchangers, are made of circular layers of corrugated tubing and are installed vertically. They are very efficient and are appropriate where space is at a premium. There are many different types of heat exchangers. The types of heat exchangers are: shell and tube, plate, regenerative, adiabatic wheel, plate fin, fluid, waste, dynamic scraped surface and phase-change.
What are two types of convection?
Convection is broadly the movement of any molecules through any fluid state, including liquids and gasses. It is the primary form of heat and mass transfer on Earth, and can be found in many systems around the world. Many people are familiar with convection from heating their food or their houses, and it also plays a pivotal role in creating the weather conditions on the planet. There are two main types of convection: forced convection and natural convection. Natural convection occurs when the medium transferring the heat is being inspired to move by the heat itself. This happens both because the medium expands as it heats up, as in the case of gases, and also because buoyancy causes the warmer fluid to rise. Natural convection is also sometimes referred to as free convection. The two types of convection, forced and natural, often occur at the same time, where the heat is causing the fluid to move somewhat, but it is also moving because of some other force. In this case, it is referred to as mixed convection. Forced convection can be seen in many places in the world, both in man-made objects and in the natural world. For example, a convection oven forces heated air to circulate through the oven by using a fan. Although the air might move somewhat on its own, the forced convection allows for an even disbursement of heat. Within the human body, the circulatory system is another great example of forced convection. Blood, among its many other uses, acts as both a heating agent and cooling agent for the body, and is forced through the circulatory system.
What three things make heat flow?
Heat flow is made by conduction, convection or radiation.
How garments can be designed to reduce the transfer of heat by convection?
clothes can be made to reduce convection by making the air tighter so convection currents can't occur or if a material is shiny heat and light will reflect off it instead of absorbing it
How can the transfer of heat by conduction or convection be made less?
Heat loss can be reduced by introducing a jacket of air and then a jacket of water on the outside.
Why does heat reaching your body through camp fire is only by radiation and not by conduction and convection?
Normally, people sit beside a fire. The heat reaching our body cannot be heat transfer by convection since this transfers heat vertically due to density changes. Horizontally, heat cannot be transferred by convection. Air is such a poor conductor that it is impossible that the heat transfer is made by conduction. By elimination, we can conclude that the heat transfer in this case is by radiation.
What materials insulate heat the best?
Air is the best heat insulator, provided you can prevent it from transferring heat by convection. This is normally made into use in double-glazed windows.
Where do you make use of good heat conductors?
Heat exchangers use heat conductors to transfer heat from one liquid to another.Refrigerators/freezers use heat conductors to cool the inside of your fridge.Disc brakes are made from materials that are good at heat conduction to keep them cool.The processor on your computer has a heat sink on it which allows the heat from the processor to be dissipated.Radiators are made of metals that are good at conducting heatThe element in a kettle is used to conduct heat.
What are the uses of conductors of heat?
-Cooking utensils, kettles, saucepans and boilers are usually made of aluminum or stainless steel where direct heating is involved. -Soldering iron rods are made of iron with the tip made of copper because copper is a much better conductor of heat than iron. -Heat exchangers such as those used in a laundry enable precious fuel to be saved
Why is vacuum the best thermal insulator?
Heat travels in 3 ways. Conduction, convection and radiation. Conduction is the transfer of heat through collision of particles. Convection is the transfer of heat through the movements of particles (ie. hot particle rises, cold particle sinks). Vacuum is made up of nothing (when there is no particle, it is vacuum), and so, it is unable to transfer heat through conduction and convection at all, making it the best thermal insulator
