What are the criteria in choosing the right heat exchanger?
What are the criteria in choosing the right heat exchanger?
The following criteria can help in selecting the type of heat exchanger best suited for a given process: Application (i.e. sensible vapor or liquid, condensing or boiling) Operating pressures & temperatures (including startup, shutdown, normal & process upset conditions)
What size of heat exchanger do I need?
Many customers ask, “how do you know what size plate exchanger to install in your domestic hot water tank?” A simple rule of thumb is 2 to 3 people in one house will determine a 10 plate. A 10 plate heat exchange is enough for 2 and 3 people.
Is it desired to place high pressure steam in tube side?
2- Fouling/corrosive cold fluid: Since steam is one of the cleanest applications, having steam on the shell side allows for the fouling fluid to be kept on the tube side. It is much easier to hydrojet and clean the shell side of an exchanger.
What is the best heat exchanger?
Plate exchanger
Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities. With high viscosities, a special tubular may be required.
On what factors effectiveness of heat exchanger depends?
Effectiveness of the heat exchanger depends on the thermal conductivity and convective heat transfer coefficient of the fluid.
What is the range of effectiveness of a heat exchanger?
The effectiveness ranged from 55.6 to 76.5% for air velocity of 1.0 m/s; 50 to 75% for air velocity of 2.0 m/s and 42.9 to 73.3% for air velocity of 3.0 m/s. The highest temperature effectiveness of 76.5% was achieved at 1.0 m/s and the lowest temperature effectiveness of 42.9% was achieved at 3.0 m/s.
Which heat exchanger is expensive?
Stainless steel tube-fin heat exchangers are more expensive than copper because stainless steel is more expensive by weight, it requires more time to punch, and it must be welded.
What factors would increase the rate of heat transfer q of an exchanger?
Factors that affect rate of heat flow include the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material. Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
How hot water changes into steam?
When water turns to steam at 212°F, a physical change occurs. On the other hand, when propane gas is ignited, it turns to carbon dioxide and water vapor in a chemical change. And change, of course, continues all the time. Let’s briefly consider the types of change by examine the compounds and mixtures.
Does hot water have more energy than steam?
Hot water heaters are considered to be more energy efficient than steam radiators. This is because hot water heaters move the water through the system using a pump, which allows the water to move at a predictable rate.
How hot does water have to get to be steam?
The basic steam point of water is when it is heated to a temperature of 212 degrees Fahrenheit, 100 degrees Celsius, or 373 degrees Kelvin. However, thanks to a great many technological advances since the days of the Industrial Revolution and the first iterations of steam engines, much of the world’s power plants now rely on a much higher controlled steam pressure point known as supercritical steam .
What is steam used in shell and tube heat exchanger?
Steam may also be used to evaporate (or vaporise) a liquid, in a type of shell and tube heat exchanger known as a reboiler. These are used in the petroleum industry to vaporise a fraction of the bottom product from a distillation column. These tend to be horizontal, with vaporisation in the shell and condensation in the tubes (see Figure 2.13.5).