Coil replacement has been a part of the HVAC aftermarket for as long as finned tube coils have been used to create heat transfer. The coils installed in the 50’s and 60’s were heavier duty than today’s coils and were almost always spiral fin type with a tension wound fin onto copper tubes. The plate fin didn’t become prevalent until the mid-60’s. By the end...
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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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Most heating coils are either a preheat or reheat coil mounted in a unit. Also, reheat coils can be mounted downstream of a unit in a supply duct. This article will address hot water and steam heating coils. There are numerous reasons why a heating coil may not perform to its expected capacity. The following are the major ones. Improper Coil Selection Heating coils can be selected...
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