![]() A steam coil should never feel cool to the touch, but when condensate blocks steam, one part of the coil will be warm while the other will be cool. When you cannot or do not evacuate the condensate on long steam coils, the condensate ends up blocking the steam. 4) What else happens if you do not evacuate condensate? As a result, over time, your coil will inevitably fail. In addition to the noise, the steam and condensate cause huge amounts of additional stress on the coil’s joints. This problem comes into play when the steam is turned back on and meets the condensate laying inside the coil. If not evacuated, the condensate just lays in the coil when the system is shut off. Slowly but surely, that steam converts into condensate, which is pretty much the worst thing that can happen to any system. ![]() On a long Steam Coil, you will be hard pressed to get the steam through the length of the coil. 3) What is a Water Hammer in a Steam Coil? ![]() 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. All tubes must be fed evenly with the same amount of water. 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. 2) Why do you feed from the bottom of the coil? Simply piping the coils in the correct manner from the beginning would seem to be the easiest and most cost-effective solution. That percentage reduction varies based on each coil’s unique dimensions, but a reliable estimate is a loss of 8-12%. 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. 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. 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. For example, with counter-flow, the air flows through rows 1-8, while the water runs through rows 8-1. This means that the air flows in the opposite direction as the water. The first thing to remember about coils and counter-flow is that chilled water coils are always built to be piped in counter-flow.
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