Coil: The coil is where the cold or hot fluid passes and often consists of copper tubes and aluminum fins.
The arrangement of the tubes, the number of rows, protective coatings of the fins (bluefin and gold fin), tube material, number of fins in unit length, and their curve form are what distinguishes between different makes.
Often, three rows of 3/8 in copper tubes are used to make the coil, however, using a double-row configuration with 1/2 in tubes will reduce pressure drop in the working fluid, in addition to improving the efficiency of the equipment. In some cases, to allow for the simultaneous supply of hot and cold air during the day, or for the different spaces in a luxury apartment, fan coil units with two separate coils are used (one for maintaining a flow of cold water from the chiller, another for the supply of hot water from the boiler). These are known as four-pipe fan coil units.
The fans, driven by the electric motors (available in several types and models), often come in low-pressure (30 Pa) and high-pressure (20 Pa) types for ducted units.
It is best to use metal centrifugal fans in the fan coil unit for maintaining dynamic balance during long periods of operation to ensure perfect air supply. High-quality polyamides are also acceptable materials that are much cheaper. Non-metal fans are not recommended for climates with cold winters that require maintaining the temperature of the water circulating a central system around 80 °C, for it can deform the fan in the long run.Price: The price is a determining factor in the purchase of any product. However, when selecting a fan coil system, the thermal comfort of the residents, durability, noise, efficiency, capacity, and appearance come first.
Overall, selecting a fan coil unit is a function of the building architecture, as well as its use, and different models—regardless of the quality of their production—do not have a general advantage over one another and must be selected according to the installation requirements.
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1CFM = 28.32 L/min
1K Cal = 4 BTU
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