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Coils and Counter-flow: 5 Common Questions


1) COILS AND COUNTER-FLOW

The first thing to remember about coils and counter-flow is that chilled water coils are always built to be piped in counter-flow. This means that the air flows in the opposite direction as the water. For example, with counter-flow, the air flows through rows 1-8, while the water runs through rows 8-1. Water always travels through the coil in the opposite direction of the air; hence the term “counter-flow.”


Direct Expansion Coils (Evaporator Coils) are also piped in the same manner.


With that said, what happens when you do not pipe cooling coils counter-flow? Almost all coil selection programs you will see or use will be based on counter-flow conditions. If you opt to not counter-flow a chilled water coil, you’ll have to reduce the coil’s overall performance by a certain percentage. That percentage reduction varies based on each coil’s unique dimensions, but a reliable estimate is a loss of 8-12%. Simply piping the coils in the correct manner from the beginning would seem to be the easiest and most cost-effective solution.

2)  WHY DO YOU FEED FROM THE BOTTOM OF THE COIL?
You always want to feed a water coil from the bottom connection so that the header fills from the bottom on up and feeds every tube connection evenly. All tubes must be fed evenly with the same amount of water. If you try to feed the header from the top, you greatly increase the risk of “short circuiting” the coil and having a higher water flow through the top tubes in the coil.

3)  WHAT IS A WATER HAMMER IN A STEAM COIL?
On a long Steam Coil, you will be hard pressed to get the steam through the length of the coil.

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Cooling Coils

CONDENSER COILS FAILING? HERE’S PROBABLY WHY….

Did you recently turn on your DX systems only to find your Condenser Coils are not working? Simple fix right? Unfortunately, no. If you get lucky, you can send us the model number of the unit, and there’s a great chance we’ve already built it. In the case that we do not have that model number on file, you have two options. You can go back to the OEM and wait two months for an OEM part while paying through the roof. Or you can call Capital Coil, and we’ll walk you through the engineering it takes to replace a condenser coil.   


Very rarely do condenser coils ever freeze so the first thing you’re going to want to know is if your coil died of corrosion, old age, or possibly vibration. Old age is obviously preferable because with a few easy dimensions, we’ll have enough to price up your duplicate coil. Condenser coils are usually outside and are easily accessible for measurements and digital pictures. With just the size, the rows, and fins/inch, you can get a price. And digital pictures of the headers and return bends will give us a good idea of the circuiting and sub-cooler circuits. 


If the coil has been eaten away by corrosion, it was an improper design to begin with. Most people don’t know that salt in the air will ruin aluminum fins within a year or two. There are two ways to combat this.



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Matt Jacobs- President
mjacobs@capitalcoil.com
484-498-8660 ext. 102 
Dan Jacobs- Vice President
djacobs@capitalcoil.com
484-498-8660 ext. 101
Capital Coil & Air
21 Turner Ln.
West Chester, PA 19380
1-800-494-0447
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