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Fan Coil Unit (FCU)

A Fan Coil Unit (FCU) is a crucial component in modern HVAC systems, designed to regulate the temperature within individual rooms or zones. It operates by drawing in air from the room, passing it over a coil that contains either hot or chilled water, and then blowing the conditioned air back into the space. This coil, depending on the season, is supplied with either heated or cooled water from a central boiler or chiller system. The integrated fan ensures a continuous circulation of air, maintaining a comfortable indoor climate. FCUs are commonly found in commercial buildings, hotels, hospitals, and residential apartments due to their ability to provide independent temperature control for each room. Compact in size and relatively easy to install, fan coil units come in various configurations such as ceiling-mounted, wall-mounted, or floor-standing, and are often controlled by a thermostat to ensure optimal comfort. By allowing for zonal climate control and reducing energy wastage, FCUs contribute significantly to the energy efficiency of HVAC systems.

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Construction of an Fan Coil Unit (FCU)

The construction of a Fan Coil Unit (FCU) is centred around a compact and efficient design that allows it to perform heating or cooling functions within a specific indoor space. At its core, an FCU consists of a metallic casing or housing that encloses all its internal components, ensuring protection and efficient airflow management. Inside this casing, one of the primary components is the heat exchanger coil, typically made from copper tubes with aluminium fins to enhance heat transfer. This coil carries either chilled or hot water, depending on whether the unit is in cooling or heating mode.

Adjacent to the coil is the fan assembly, which usually consists of one or more centrifugal or tangential fans powered by an electric motor. These fans draw in air from the room through a return air grille, pass it over the coil, and then distribute the conditioned air back into the room through an outlet grille or duct connection. A filter is also integrated into the unit to capture dust and airborne particles, ensuring that clean air is circulated.

Additionally, most FCUs are equipped with a drain pan located beneath the coil to collect and remove condensate water that forms during cooling operations. The unit may also include control elements such as a thermostat, valves, and actuators that regulate water flow and fan speed, offering precise temperature control. All these components are assembled within a durable frame that is either mounted on the ceiling, floor, or wall, depending on the installation requirement.

Main Components of a Process Chiller

An Industrial Process Chiller is made up of several essential components that work together to regulate temperature and ensure smooth operation. Each part plays a crucial role in the refrigeration cycle:

  1. Compressor:
    This is the heart of the chiller. It compresses the refrigerant gas, increasing its pressure and temperature so it can move through the system efficiently. Types of compressors include scroll, screw, reciprocating, and centrifugal, depending on the chiller’s capacity and design.
  2. Evaporator:
    The evaporator is where the process fluid (such as water or glycol) passes through and loses its heat to the refrigerant. This is where heat absorption occurs, and the refrigerant turns into a gas.
  3. Condenser:
    After compression, the hot refrigerant gas flows into the condenser. In this component, the heat is removed either by air (air-cooled) or water (water-cooled), and the refrigerant changes back into a liquid.
  4. Expansion Valve:
    The expansion valve regulates the flow of refrigerant into the evaporator. It reduces the pressure and temperature of the liquid refrigerant before it re-enters the evaporator to absorb more heat.
  5. Process Pump & Reservoir:
    A circulation pump pushes the cooled fluid to the process and brings the warmed fluid back to the chiller. The reservoir holds the process fluid and acts as a buffer to handle thermal loads.
  6. Control System:
    Modern chillers come with advanced control panels and sensors that monitor and regulate temperatures, flow rates, pressures, and operating parameters for safety, efficiency, and precision.
    Together, these components form a reliable and energy-efficient system that keeps industrial operations stable, regardless of heat-generating activities within the facility.

Types Of Fan Coil Unit (FCU)

Edgetech offers wide range of Fan Coil Units in Single Skin/ Double Skin Construction with cooling capacity varying from 1 TR to 3.5 TR and Air flow varying from 400 CFM to 1400 CFM.

Features:

  1. Available in Single/ Double Skin Construction
  2. Each unit had 2 Nos. DIDW Forward Curved Fans. EC Fans available as option
  3. Cooling Coil in Copper Construction with Aluminum Fin, 3 row  deep
  4. Washable Type 12mm Air Filter

Edgetech offers decorative type chilled water cassette units with cooling capacity varying from 0.75 TR to 3.5 TR wherein cooling capacity is based on inlet air temp: 27°C DB/19.5 °C WB inlet water temp 7°C, outlet water temp:12°C.

Unit comes with Inbuilt condensate drain pump.

Features:

  1. Elegant looking ABS grill with louvers.
  2. Provides superior air distribution with airflow in all four different directions, helps planners to provide cooling in all areas.
  3. Electrical terminal box with electrical wirings provided.
  4. 3 speed motor with 230 V/ 50 Hz, class B insulation with an integrated over thermal contact for motor protection.
  5. Heat exchanger made of copper tubes, mechanically expanded into aluminium fins for maximum thermal contact.
  6. ABS polystyrene foam drip tray. Designed for the optimization of air diffusion.
  7. 2 or 3 way control valves are available as an optional accessory, delivered separately (not mounted on the unit).
  8. Synthetic washable filter that is easily removable from the unit for serviceability.
  9. Float switch centrifugal pump of maximum head, integral with the unit and wired to the main control panel.
  10. Wireless remote control with LED display is standard
  11. Elegant and slim design
  12. Vertical swing louver control
  13. LCD display
  14. Wireless 3m transmission
  15. Operation modes (Auto/Cool/Dry/Fan)
  16. ON/OFF Timer
  17. Temperature control range varying from 170 C to 30o C
  18. Fan speeds selection

Edgetech offers decorative type Fan Coil Units for Exposed Vertical or Ceiling Suspended Application with cooling capacity varying from 1 TR to 3 TR and air flow varying from 400 CFM to 1200 CFM

Design And Special Features

  1. Common Unit for Exposed Vertical or Ceiling Suspended Application.
  2. Universal type fan coil units required to fulfil the vertical and horizontal installation requirement.
  3. It is suitable for exposed installation.
  4. Made of large thick GI steel sheet with holes provided for fixing on to the wall / ceilings and lined with thermo-acoustic internal insulation.
  5. Thick gleel sheet-built cabinet that is resistant to the rust and corrosion. The cabinet is lined with thermo-acoustic insulation with holes provided to hang the unit.
  6. Air delivery grill made of ABS can be rotated in 1800 for air flow reversal.
  7. Highly efficient copper coils with aluminium fins are provided with anti-torsion sygtem, hand air vent valves and hand water drain valves.
  8. Coils are tested at 21 Kg/cm2 under water. I Direct drive DIDW forward curved fan assembly is statically and dynamically balanced for silent operation.
  9. 3 stepped permanent split capacitor type motor comes with built in thermal over heating protection having permanently lubricating bushes
  10. Easily removable and serviceable air filter is made of a metal frame.
  11. Drain pan with Ø 21mm pipe is covered with heat insulation.
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