What are the different types of heat exchangers?
Types of Heat Exchangers
- Shell and tube heat exchangers.
- Double pipe heat exchangers.
- Plate heat exchangers.
- Condensers, evaporators, and boilers.
What is the best type of heat exchanger?
The parallel-flow heat exchanger is the most suitable one if the area is an important parameter where as the counter-flow heat exchanger for the maximum net gain. The maximum net gains for all heat exchanger types are given in Table 3.
What is 2/4 shell and tube heat exchanger?
Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. Two and four pass designs are common because the fluid can enter and exit on the same side.
What is baffle cut?
Baffle is provided with a cut (%) which is expressed as the percentage of the segment height to shell inside diameter. In general, baffle cut can vary between 15% and 45% of the shell inside diameter. This cut allows the fluid to pass through in parallel or counter flow direction.
How do you find the rate of heat transfer?
So the rate of heat transfer to an object is equal to the thermal conductivity of the material the object is made from, multiplied by the surface area in contact, multiplied by the difference in temperature between the two objects, divided by the thickness of the material.
Why baffles are used in heat exchanger?
Baffles also serve as support s for the tubes during operation and help in preventing vibration from flow induced eddies. Although heat transfer is increased through the baffle arrangement, the pressure drop of the shell side fluid is also increased due to the decreased flow area, leakage and bypass effects.
What is use of baffles?
Baffles are flow-directing or obstructing vanes or panels used in some industrial process vessels (tanks), such as shell and tube heat exchangers, chemical reactors, and static mixers. A baffle is designed to support tube bundles and direct the flow of fluids for maximum efficiency.
What is baffle?
(Entry 1 of 2) transitive verb. 1 : to defeat or check (someone) by confusing or puzzling : to confuse or frustrate completely : disconcert Her behavior baffled her parents. 2 : to check or break the force or flow of by or as if by a baffle (see baffle entry 2) baffle the steam.
What is h in heat transfer?
The convective heat transfer coefficient (h), defines, in part, the heat transfer due to convection. The convective heat transfer coefficient is sometimes referred to as a film coefficient and represents the thermal resistance of a relatively stagnant layer of fluid between a heat transfer surface and the fluid medium.
Which has maximum value of thermal conductivity?
Diamond is the leading thermally conductive material and has conductivity values measured 5x’s higher than copper, the most manufactured metal in the United States. Diamond atoms are composed of a simple carbon backbone that is an ideal molecular structure for effective heat transfer.
How do you find h in heat transfer?
Overall heat transfer coefficient
- Air – h = 10 to 100 W/(m2K)
- Water – h = 500 to 10,000 W/(m2K).
How is heat transfer by radiation?
Heat transfer by thermal radiation is transfer of heat by electromagnetic waves. It is different from conduction and convection as it requires no matter or medium to be present. The radiative energy will pass perfectly through vacuum as well as clear air.
Which of these is the best example of heat transfer by radiation?
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.
Which is the best example of heat transfer by convection?
Everyday Examples of Convection
- boiling water – When water boils, the heat passes from the burner into the pot, heating the water at the bottom.
- radiator – A radiator puts warm air out at the top and draws in cooler air at the bottom.
Which substance will conduct the least amount of heat?
Substances for which conductivity is low, such as asbestos, wood, and air, are poor conductors of heat and are therefore good insulators. Materials with low conductivity do not transfer their heat rapidly.