What is a Fan Coil Unit in an HVAC system?
A fan coil unit (FCU) is a small terminal unit that is often composed of only a blower and a heating and/or cooling coil. FCUs are commonly used in hotels, condominiums, or apartments. Abbreviated FCU, a fan coil unit’s primary function is to heat or cool air in order to maintain the desired temperature set point in space.
What does a fan coil do?
A fan coil unit circulates air in a space and can be used to control the temperature, humidity, and air quality in that space. FCUs are often used in combination with other HVAC equipment, such as an air handler or rooftop unit, to provide heating and cooling for a space.
Does a fan coil unit have a condenser?
No, a fan coil unit does not have a condenser.
Fan coil unit efficiency
FCUs are typically very efficient, as they do not use a lot of energy to operate. Additionally, FCUs can be used in combination with other energy-saving HVAC equipment, such as variable speed drives, to further increase their efficiency.
Two main types of fan coil units
There are 2 main types of fan coil units:
- Those with direct expansion (DX) coils. DX coils contain refrigerant that circulates within the coil in order to absorb or reject heat from the air passing over the coil.
- And those with chilled water coils. Chilled water coils use chilled water from a central chiller plant to remove heat from the air.
How much does it cost to replace a fan coil unit?
The cost to replace a fan coil unit varies depending on the type and size of the unit, as well as the complexity of the installation. Generally, replacement costs range from $500 to $3,000.
When should I replace my fan coil unit?
If your FCU is more than 10 years old, it may be time to consider replacing it. Additionally, if your FCU is not working properly or is not efficient, replacement may be the best option.
What is the difference between a fan coil unit and an air handling unit?
An air handling unit (AHU) is a type of HVAC equipment that circulates and controls the temperature and humidity of air in a space. AHUs are often used in commercial and industrial buildings. A fan coil unit is a small terminal unit that is often composed of only a blower and a heating and/or cooling coil. FCUs are commonly used in hotels, condominiums, or apartments.
The ducted fan coil unit
A ducted fan coil unit is connected to a ductwork system and circulates air through the ducts to the rooms or spaces that need to be heated or cooled. A ductless fan coil unit does not require ductwork and can be used to heat or cool a single room or space.
What are the benefits of using a fan coil unit?
Fan coil units offer many benefits, including:
- improved indoor air quality,
- increased comfort levels,
- energy efficiency,
- lower operating costs.
Conclusion
In order to properly condition a space, fan coil units must be carefully selected and sized for the specific application. Factors that must be considered when selecting and sizing a fan coil unit include:
- the space’s function,
- the desired set point temperature,
- the occupants’ comfort requirements,
- the type of HVAC system (e.g., DX or chilled water),
- and the available static pressure in the ductwork.
Fan coil units offer many benefits over other types of terminal units. They are relatively inexpensive, easy to install, and require minimal maintenance. Additionally, fan coil units are highly versatile and can be used in a variety of applications.
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