1) Can we assist with Design of your application.We would be happy to design for you.
2) Do you charge for design?
We are very proactive. While we do charge a small fee per design to cover our costs, we absorb these costs when it is for a regular customer or where we are working jointly on a project. We also refund the fees in case it is followed by an order.
3) Why do Pin fin tubes weigh less than L type fin tubes?
Pin fins are made from Wire. Being cylindrical, wire has a larger area per unit of weight than the strip used in L type fin tubes. Also due to the looped nature of the wire less material is put on the tube than in the case of L fins. Consequently the surface area of fins per meter of tubes is also less. However due to the superior turbulence created by the looped wire the actual heat transfer per meter of tube is significantly higher than in the case of L type fin tubes. All this together contributes to the wire wound fin tube being weighing less than that of L type fin tubes. In the case of similar metals, it is weighing half and in the case of Aluminium L fin vs. Steel wire fin they weigh about the same.
4) How do we compare the surface area for Pin fin and L type fin tubes?
Actually we don't compare the surface area of the two types of fin tubes. The reason is that it is not comparable as the wire fins are way more efficient. However it makes sense to compare the linear heat transfer coefficient per foot or meter of tube to get a correct comparision.
5) Why is airside pressure drop important?
Pressure drop is important as it is a root cause of power consumption. The power consumption increases exponentially to a linear increase in pressure drop. (refer the fan laws). This is why it is important to design equipment with optimum number of rows giving the best trade off between power consumption and heat transfer. With Pin Fin tubes as the number of rows is halved the power consumption is significantly reduced.
6) Why can you not give Wire wound fin tube with Aluminum fins?
Aluminum does not lend itself to soldering. Hence since Pin fin tubes are soldered, we cannot use Aluminum tubes or fins.
7) What causes the temperature limitation on the pin fin tubes?
Pin fin tubes have the pin fins soldered to the tube for good bonding and strength. The consequence is that if the melting point of solder is reached, the solder softens and the Pin fins come loose. However the solder we use has a melting point of 190 degrees C and on request a high melting point solder is provided with a melting point of 290 degrees C.
8) How do turbulators help?
The Pin fin tube has a tremendous airside heat transfer coefficient. When the fluid on the tube side is viscous the tube side heat transfer is limited reducing the overall heat transfer coefficient. By using turbulators on the tube side it is possible to significantly increase the tube side heat transfer rate also.
9) Why is the advantage in steam heaters so pronounced?
Steam has a very high tube side coefficient. The tube side is therefore the dominant side. This situation begs for the airside coefficient to be high to best utilize the heat transfer potential of steam. With Pin Fin tubes we are able to achieve a very high airside and therefore overall heat tranfer coefficient.
10) What is the best way to clean a Pin Fin tube?
Unlike L type fin tubes, the pin fins are soldered to the tube and have a very strong bond. It is possible to hose the tube off for cleaning. The L Fin could get damaged by high pressure hoses, but not the Pin Fin.
11) How do we cut the Pin Fin tube into smaller lengths?
After cutting the tube, the wire loops (Soldered to the tube and held in place by a binding wire) have to be pulled out with the binding wire with a set of pliers. After removing the required number of fin rows, the fins must be removed from the binding wire. The wire can then be tied back around the tube. This procedure may sound complicated but is easy to do. The solder residue must then be cleaned from the tube. This can be done by heating and wiping off.
12) Can we order the tubes in smaller lengths to prevent having to cut them at site?
Yes we can give the tubes in the required lengths.
13) What is the market acceptance of Pin fin tubes?
The Pin fin tube has been around for several decades in the UK and Australia where Copper Pin fins are popular.
Currently over 90% of our production is directly exported to USA, Mexico, UK, Austria, Germany, UAE, Singapore, Malaysia, Thailand, Indonesia, Australia. We are looking at developing meaningful partnerships all over the world.
-Devang Jhaveri, President, Concept Engineering International.
Second Floor, K.K. Chambers,