Heat Exchangers

Dirty Coil

Finned tube coils are meant to have contact with the air flow, as more contact creates more heat transfer. Heat transfer is nothing more than heat exchanged from one medium to another, and the goal is to create maximum heat transfer efficiency. The downside to this process is the coil’s susceptibility to foreign materials becoming lodged in them. The following explores this problem in a...

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Outside Air Loads

HVAC and process heating/cooling must deal with the added tonnage created by using fresh air from outside. Most times, the requirement for fresh air is mandatory and can go from 10% all the way to 100 % of the system air flow. There are numerous rules and regulations written to eliminate air flow quality problems, including bacteria and other micro-organisms, that can cause health problems....

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Corrosion in Tube

There are many reasons why hot water coils in your system can under-perform. Some reasons are from the time of the design, and many other instances can also occur after the coils have been installed. Here are 10 common reasons why hot water heating coils can fail:   Air stratification issues - The air flow across the surface of the coil is not being evenly...

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Plugged Coil

  Replacing heat exchanger coils was adapted ever since the beginning of the HVAC and processing/cooling era. It’s now close to 90 years since the first finned tube heat exchangers appeared on the market in the early 1900’s. The coil has undergone drastic changes over the years, from the spiral wound type to the plate fin coils that currently dominate the market. Throughout each decade, the...

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Corroded-tube-bundle - blog

USA Coil & Air manufactures shell and tube heat exchangers and replacement tube bundles for existing equipment. Most of our applications are water to water type or steam to water type of heat exchange. Tube materials are normally copper, carbon steel, admiralty brass, 90/10 cupro-nickel, 304L or 316L stainless steel. Tube sheets can be made of the same materials. We can cross reference many of...

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