The “holiday season” may be over, but the “coil replacement season” is in full swing in many areas of the country. Particular attention must be paid to the condition of your heating and cooling coils. Heating coils that aren’t providing the needed BTUH capacity can become a huge problem in the dead of winter, while cooling coils and condenser coils must be ordered and replaced...
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The HVAC industry has many manufacturers of units that all have heating and/or cooling coils as an integral part of their package. There are also many free-standing coils in large built up systems and some are mounted in duct runs from a central station unit. What they all have in common is the presumption that all the coils will meet the designated performance. They do...
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Almost all packaged A/C or split system units do not have a service factor for extra capacity. Even when new, these units may not yield the cooling BTUH capacity specified due to improper installation and/or incorrect load calculations at the inception of installation and startup. Consequently, as the system gets older and parts become less efficient, the system may lower its capacity to the point...
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There are many existing systems that require the addition of cooling to a heating-only unit. Systems need to keep pace with changing requirements for spaces that include a mandatory requirement for cooling. Existing systems can already have cooling, but a booster will have to be placed into the system to add additional cooling. When cooling is added, it must be decided whether the tonnage can be...
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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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Many projects require downstream duct mounted coils to heat or cool air to its final desired temperature. Normally there are upstream coils that regulate the leaving air temperature to a design intermediate level. The duct coil takes the air from that intermediate level to its final desired temperature. Many systems can vary the air flow or water volume to achieve a desired leaving air temperature...
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