What is finned pipe?
Finned tubes are the main components of heat exchangers. They are a series of tubes where fins have been added on the outside to increase the contact area with the outside fluid, to exchange heat and between the fluid inside the tube and the fluid outside the tube.
What is the purpose of aluminum fins?
The basic performance for fin tube heat exchange should be with good solder ability and form ability, higher mechanical strength, good corrosion resistance and thermal conductivity. In spite of these, aluminum and alloy are also featured in extension and higher tensile strength increases under lower temperature.
How are Finned tubes made?
The finned fin tube is simple to manufacture. The metal band is mechanically or welded around one end of the tube. The metal band is tightly wound on the outer wall of the tube by the torque of the tube. The other end is fixed to form a finned fin tube.
What is the fin efficiency?
Fin efficiency is defined as the ratio of actual heat flow of the fin to that which would be obtained with a fin of constant temperature uniformly equal to the base surface temperature, that is, one with infinite thermal conductivity.
What is fin pitch?
Fin pitch (distance between centerlines of fins) Spacing between fins. Height of heat exchanger [m]
What is the best material for fins?
Aluminium is one of the most frequently used materials for fin due to its higher thermal conductivity and comparatively low cost.
How do you increase fin effectiveness?
Since the fin efficiency is inversely proportional to Λ, it can be improved either by increasing k and B, or by decreasing 〈h〉 and L. If the average heat transfer coefficient, 〈h〉, is increased due to an increase in the air velocity past the fin, the fin efficiency decreases.
Why finned surfaces are widely used?
14-53C Finned surfaces are frequently used in practice to enhance heat transfer by providing a larger heat transfer surface area.
How do you calculate fins per inch?
Fins are measured in fins per inch. Hold a tape measure up to the coils and count the number of fins in one inch. If you can’t get in to take the measurement, a safe rule of thumb is 10-12 fins/inch.
What are the limitations in using fins?
Disadvantages Of Fins : We know that the length of the fins is directly proportional to the heat-transferring rate. But the larger length is may be cause of bending in the fins and also increases the weight of the engine. Therefore the overall efficiency will go to decrease.
What metal are fins made of?
Since fins are responsible for most of the heat transfer in your coils, they also come in a variety of materials, including copper, aluminum, steel and stainless steel.