There is no exact definition of high-temperature fans. But going by industrial fan manufacturers, high-temperature fans can tolerate air-stream temperatures of approximately 250 degrees Fahrenheit or 120 degrees centigrade.
Whether it is a chemical plant, a furnace, or a bakery – high-temperature fans are necessary everywhere. They are very crucial for the smooth functioning of the industry. Without such fans, the industry may come to a standstill, and the consequences may be grave.
When such conditions prevail, often the industry comes to a halt and production stops. In such conditions, the industry owners generally prefer to substitute high-temperature fans. When you buy such fans, there are many points that you might consider.
What Is Air Stream Temperature?
Air stream temperature is the gas temperature or the air inside the fan. It is different in temperature from the air that surrounds the atmospheric air. It is also different from the air that envelopes the motors, bearings, and other parts play an important role in the manufacture of the fan.
How Do High-Temperature Fans Fail?
A high-temperature fan can fail in many ways. It fails when:
The Wheel Fails
The wheels sometimes break due to technical reasons, or they get distorted. Thermal creep sometimes is the cause of such failures. And thermal creep happens because of the lack of proper selection in the raw materials of the components of the air-streaming units.
When the temperatures are exceedingly high, the manufacturers sometimes use special casting alloys to decrease welding due to operational breakage. This naturally reduces the factors contributing to thermal creep. This breakage is undesirable because the owners lose production time, and the costs keep shooting up.
Therefore, in this aspect, the wheel design also plays an important role in high-temperature fans. For lower temperatures, shrouded fan wheels covered with airfoils are ideal. The blades here curved backward or inclined backward. This makes the blades efficient.
For very high temperatures, forward curved, radial blades or propeller fans are required. With the increase in temperature, the speed of the fans goes down. To increase the speed of the fan, wheel or shaft failure must be taken care of and avoided at all costs.
The Failure Of The Shaft
Another cause why high-temperature fans fail is the failure of the shaft. The shaft’s material depends on the temperature, speed of the fan, arrangement of the fan, and the load it is supposed to bear. The most important shafts used are solid shafts with heat slingers, water-cooled shafts, and air-cooled shafts.
The Failure Of The Bearing
The bearing of high-temperature fans should be selected depending on the speed of the fan and the load it is supposed to bear. Here again, bearings are various types like spherical roller bearings or self-aligning ball bearings. These bearings should be lubricated properly with the proper lubricant that is required.
What Are The Factors That High-Temperature Fans Are Dependent On
Good quality high-temperature fans are dependent on factors like:
- Material of the fan
- Shaft assembly
- Corrosive free materials
- Fan insulation
The Features Of High-Temperature Fans
Certain features of high-temperature fans are the deciding factors while buying the fan. You must look out for these features. These features are:
- Well insulated casing
- Thermal insulation
- Good impeller
- Transmission assembly
- High-quality motor
- The working environment temperature
- The support that the motor gives
The Most Suitable Fan
The most suitable high-temperature fan is the high-temperature axial fans that are compact. They are used to circulate air ideally for environments where there are heavy machinery, equipment enclosures, and ovens & furnaces.
These are some points that you can consider while buying high temperature fans. Choosing the best brands from so many of them out there can be challenging, but with a bit of research and gathering some knowledge about the use and construction of high temperature fans, it will be easy for you to find the best one for your need.