Tuesday, 2 June 2015

Heat Exchangers from Heat Recovery

Heat exchangers are the unsung heroes of many industrial processes and as such they tend to be taken for granted - nobody likes paying for what is often seen to be unnecessary maintenance. Heat exchangers provide duty for so long, that when they start to drop in efficiency, it's usually a gradual process that goes largely unnoticed - until their performance has deteriorated sufficiently to be a problem. Then it really is a problem - and one requiring urgent attention.
What aggravates the situation is the heat exchanger that has never been cleaned properly, coupled with the commercial need to keep it on-line. When the decision is made to carry out cleaning, often nobody knows what the performance of the exchanger is meant to be, either because the drawings have been lost, or no record of any improvement was made after the original cleaning.
When the exchanger finally is opened up to ascertain the extent of the fouling, it's not surprising to find it is so severe that cleaning takes a lot longer than planned. Any benefit that might have been gained by a quick traditional clean is offset by the extended cleaning duration and costs - and, of course, lost production.
If that sounds like a nightmare scenario, bear in mind that this is the sort of situation specialist cleaning companies encounter every week. Cleaning is often carried out without any firm knowledge of how much of an improvement the cleaning will give and how long its effects will last. Having to make 'finger in the wind' predictions clearly is not a satisfactory way to plan maintenance.
One of the most popular and widely-employed heat exchanger configurations in industry, is the straight or hairpin shell-and-tube exchanger. With hundreds or thousands of small-bore tubes bundled together, the extent of quite modest scaling can involve major work to return the exchanger to anything near its commissioned performance. If the outside of the bundle is heavily scaled as well, the cleaning challenge rises by an order of magnitude.
There is potential to bring about a significant improvement in heat exchanger accessibility and 'cleanability', by working more closely with the people who design heat exchangers and fabricate industrial plants.
Better design would lead to improved cleaning - where improved means faster, cleaner and safer, possibly in-situ or even on-line and with better waste containment. It would then be easier and quicker to clean exchangers back to bare metal to return them to duty and their design performance faster.
Plants are generally specified and ordered on the basis of throughput, not accessibility and ease-of-cleaning. Suppliers are happy to comply with this and therefore tend to design heat exchangers with 30-40% excess capacity to ensure that they can continue to provide duty, even when quite extensively fouled. Heat exchangers the world over are currently designed and installed with a view to using one of three systems for cleaning: chemical, pressure jetting and/or mechanical and this approach has remained unchanged for over 50 years.
When it comes to maintenance, refineries - like most of industry - tend to compete on the same basis - a 21-day shutdown is decreed because it's been done that way for maybe the last 20 years. The same cleaning methods are generally used slavishly, with high-pressure water as the cleaning medium.
Most companies look at their heat exchangers in isolation and simply try to extend their run-time, instead of having them designed or re-designed so they can be cleaned more regularly, but faster and better. BP's Coryton refinery, for instance, managed to reduce cleaning time on one shell-and-tube heat exchanger from three days to three hours by applying a different approach to cleaning it.
If a plant is optimized for cleaning, almost full production can be maintained throughout the cleaning process. Relatively minor mechanical changes, such as adding isolating valves to heat exchangers, means that each exchanger, or bank of exchangers, can be taken down and cleaned while the others remain on-line. A redesign of the exchanger so that a header can be removed, means it can then be cleaned with a different system to the standard high-pressure water jetting, in a few hours instead of several days.
At Dow Corning's silicone plant in Barry, south Wales, a tubular boiler and fire tube in the Energy Recovery Unit (ERU) required the removal of a 5mm layer of deposit in as short a time as possible to minimize lost production. Another obstacle was that the unit, which carries waste gases, takes 48 hours to cool and prepare - even with the introduction of a chilled nitrogen purge - before personnel can enter to clean it manually.
The solution involved developing a bespoke remote de-scaler, which was inserted through a small 50cm man-way. Once inside, the de-scaler expanded to fit the hot fire tube, while reaching the full length of the carbon steel tube. With cooling time and man entry eliminated, the shutdown was reduced from five days to three and there was a noticeable improvement in performance of the ERU when it came back on line.
Improved cleaning cycles also mean the rate of future fouling build-up is reduced, which in turn reduces the risk of tubes corroding as a result of the exchanger being open to the atmosphere longer for cleaning.
Heat exchanger surfaces therefore remain smoother and provide better heat transfer. If and when the exchanger does foul up, it's easier to clean next time around, using whichever system is preferred. This would represent a change of practice to what has been the norm since the 1980s, for instance, when what was then Mobil in the UK was one of the first refineries to decide that it would extend run-times by abandoning the annual clean and only clean every two years.

Fans/Cooling Products Description

Cooling Products is one of the air-cooled heat exchangers. Air-cooled heat exchangers are generally used where a process system generates heat which must be removed, but for which there is no local use. A computer fan can be any fan inside a computer case used for cooling purposes, and may refer to fans that draw cooler air into the case from the outside, expel warm air from inside, or move air across a heatsink to cool a particular component.
*Case mount, used to aerate the case of the computer
*Power Supply fan often plays a double role, not only keeping the PSU itself from overheating, but also removing warm air from inside the case.
*CPU fan, used to cool the CPU
*Graphics card fan, used to cool the GPU and/or memory on graphics cards.
*Chipset fan, used to cool the Northbridge of a motherboard's chipset or for system bus over clocking.
One of the deadliest threats to your personal computer or notebook is heat! Heat is not an element you want to add to your system design. Keep your system cool by adding additional cooling components to your existing or new system. Today's processors and video cards use smaller and smaller technologies running at faster and faster speeds. The result is ever greater amounts of waste heat. Without the right kinds of computer cooling, heat can destroy your high speed computer. Ever computers fresh out of the box can benefit from improved case fans and CPU processor fans. By upgrading your computer cooling system you can have cooler systems and dramatically extend the reliable life of your computer. In many cases you can even improve the performance of your computer by cooling - memory and processors can run faster when cool

Heat is not an element you want to add to your system design. Keep your system cool by adding additional cooling components to your existing or new system. Case fans help protect your whole computer investment by providing case cooling to reduce component-killing heat buildup, thus increasing the longevity of components and your PC.

The coolers available for operating in cold climates requiring warm air recirculation systems and controls to prevent freezing or hydrate formation in the process fluids.
Some of the features commonly incorporated into their designs are:
  • Deep plenum chambers for better air distribution over the face of the tube bundle
  • Rounded and eased fan rings for lower fan power consumption and better air distribution
  • Cast zinc collars on the finned tubes for the tube supports 
  • On tube bundles with L-footed fins they also have cast zinc collars at the tubes ends 
  • All hot-dip galvanized structures and plenums
  • Flame-spray metallized header boxes to eliminate paint touch-up and costly maintenance
  • Extensive cross-bracing of structures to withstand heavy wind or seismic loads

Cooling Products can provide coolers with extruded aluminum fins with for diameters of 5/8" through 1-1/2" in lengths up to 60 feet. They are one of the few cooler manufacturers to manufacture their own extruded finned tubes. They currently have the capability of finning tubes with outside diameters of 1.0", 1.25", and 1.50" in lengths up to 60 feet. 

Lastly, they offer solid, conservatively designed coolers at competitive prices. They have gained a reputation for keeping their delivery promises. One of the real tests of a vendor is the fairness with which they treat a customer for any changes made after an order is placed.
 We have worked with Cooling Products for several years on many projects, and can honestly say that they have been extremely fair with their customers in this regard. We strongly recommend that you consider Cooling Products for your next project requiring air-cooled heat exchangers.

Best Fin Fan Cooler Manufacturer in India

A fin fan cooler is a term used to refer to an aerial cooler. I believe at one time a specific manufacturer called their coolers "Fin-Fans" and the term later came to be a reference to any aerial cooler. Much the same was as electric refrigerators were all referred to as Frigidaire's or copies are referred to as XEROX's.
This type of aerial cooler is used a great deal in refinery and petro chemical plants. The construction usually consists of two metal rectangular boxes with drilled holes to accept hollow tubes that have aluminum fins attached to them.
For those familiar with a car radiator, the concept is the same. The difference is Fin Fan Cooler Manufacturer construction needs to be more robust because the pressure contained by the coolers is usually much higher than that of a car radiator.
The two boxes (called headers) with the interconnecting tubes are housed in a light metal plenum that directs air from one or more fans over the finned tubes to achieve the desired cooling.
This is a simplified description of an aerial cooler. There are many details regarding fabrication, configuration, materials, fan design etc. that I have left out.
Air coolers are twice as expensive to purchase and install as water coolers. The great advantage of an air cooler is that it does not need cooling water. The difficult aspect of air cooling arises from the flow of air across the tubes.
Most air coolers are either induced-draft or forced-draft, the more common arrangement being forced draft. The air is moved by rather large fans. The tubes are surrounded with foil-type fins, typically 1 in high. The surface area of the fins as compared to the surface area of the tubes is typically 12 to 1. That is why we call an air cooler an extended-surface heat exchanger.
The heat-transfer coefficient of an air cooler Aluminum Radiator (Btu, per hour, per square foot of finned area, per degree Fahrenheit) is not particularly good. It might be 3 to 4 for cooling a viscous liquid, or 10 to 12 for condensing a clean vapor. The low heat-transfer coefficients are offset by the large extended surface area.
In a forced-draft air cooler, cool air is blown through the underside of the fin tube bundle. In an induced-draft air cooler, cool air is drawn through the underside of the fin tubes. Either way, road dust, dead moths, catalyst fines, and greasy dirt accumulate along the lower row of tubes. As the tubes foul, they offer more resistance to the airflow. 
The next time you have plans to purchase Evaporator Coils, Tube Bundles, Trane Coils make sure that you take into account the vital factors.
If you are planning to buy Evaporator Coils or Tube Bundles then it is important that you take into account several factors. There are so many varieties available in the market that you might get confused. But once you have a list of factors in front of you, it will be easier for you to make the search.
The first thing that you need to consider is their quality. If these coils are not high on quality then they will not serve the desired service. So don't compromise on the quality. There are many service providers in the market. So when you are browsing through the sites, check out the quality of the coils. Are they quality tested? What are the different types of tests have the coils undergone. Find out more about this.

As you are planning to purchase Trane Coils or any other type, there is another vital thing that you need to consider and that is whether they are shock proof? Generally electricity passes through these coils and if they are not shock proof then the chances of electrocution remains. Hence insist on items that are shock proof.
Opt for a company that manufactures these items and deals in them as well. This is important because then you will come across a variety of coils. You will be able to take your pick from different models. If you opt for a company that is merely a dealer in these coils then there are chances that you will have to take your pick from the stock available with them. Even if you place an order with them there is no guarantee that they will be able to deliver. Only when they come across the variety will they be able to deliver on time. Hence it is advisable that you don't take this risk.
Always check out several manufacturers so that you can compare the different varieties as well as compare the cost charged. If you opt for a single company and go ahead and make your purchase, you might come across a vendor later on that deals in the same things but at a much lower rate. And then there is no point in regretting. So make the comparison before hand before you purchase.
Browse through the local review sites to see which companies are referred by them. From there make your list and start calling them up accordingly.
Read through the client testimonials as well to see what they have got to say about the particular company. Client testimonials are a great place to collect information about the service providers.

And finally make sure that the service provider will deliver the items at the address provided
So what are you waiting for? Go ahead and place the order today only. Once you consider all the above mentioned factors it will be easier for you to find the right company that deals in these items. So go ahead and begin your search today.