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Fan coil unit: A fan coil unit FCU is a simple device consisting of a heating or cooling coil and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings.
Typically a fan coil unit is not connected to ductwork, and is used to control the temperature in the space where it is installed, or serve multiple spaces. Fan coil units have been selected to provide local heating and cooling for many years and there are still many positive attributes that justify the choice of a fan coil unit system today.
It is necessary for manufacturers of these products to constantly respond to changing market demands and satisfy increasingly stringent legislation, in particular that regarding energy consumption. Rather than this legislation resulting in the demise of the fan coil unit, it has prompted manufacturers to take ever more innovative approaches to their design, as well as consider the advantages proffered by entire heating and cooling systems.
As such, advances in the technology applicable to both this product and those that complement it have resulted in the resurgence of the fan coil unit Types of fan coil unit: Fan coil units are divided into two types 1. Two-pipe fan coil units: Two-pipe fan coil units have one supply and one return pipe. The supply pipe supplies either cold or hot water to the unit depending on the time of year. Four-pipe fan coil units: Four-pipe fan coil units have two supply pipes and two return pipes.
This allows either hot or cold water to enter the unit at any given time. Since it is often necessary to heat and cool different areas of a building at the same time, due to differences in internal heat loss or heat gains, the four-pipe fan coil unit is most commonly used.
Operation of fan coil unit: A concealed fan coil unit will typically be installed within an accessible ceiling void or services zone. It is quite common for the return air not to be ducted and to use the ceiling void as a return air plenum. The coil receives hot or cold water from a central plant, and removes heat from or adds heat to the air through heat transfer. Traditionally fan coil units can contain their own internal 3. However, and as is common in most modern buildings with a Building Energy Management System BEMS , the control of the fan coil unit will be by a local digital controller or outstation along with associated room temperature sensor and control valve actuators linked to the BEMS via a communication network, and therefore adjustable and controllable from a central point, such as a supervisors head end computer.
Fan coil units circulate hot or cold water through a coil in order to condition a space. The unit gets its hot or cold water from a central plant, or mechanical room containing equipment for removing heat from the central building's closed-loop.
The equipment used can consist of machines used to remove heat such as a chiller or a cooling tower and equipment for adding heat to the building's water such as a boiler or a commercial water heater. Many advantages of fan coil unit systems: 1. Water based fan coils: Although, fan coil units may utilize a medium of either chilled water CHW or refrigerant to provide cooling, they are primarily associated with chilled water.
The principal advantage of installing a fan coil unit system that wholly employs water as the cooling medium is that there is no need for the specific checking and maintenance demanded by the F Gas regulations pertaining to those installations that necessitate the presence of refrigerant within the building envelope. Heating medium: Similar to the cooling medium, although fan coil units are capable of providing heating using either hot water or refrigerant, they are typically supplied with low temperature hot water LTHW.
The principal advantage again being that the use of water as the heating medium negates the need for the specific checking and maintenance demanded by the F Gas regulations pertaining to those installations that necessitate the presence of refrigerant within the building envelope.
Renewable Energy compatibility: Fan coil units are compatible with, and can be used with, renewable energy systems. Physical size: Fan coil units have large maximum cooling and heating outputs and therefore they afford the installer a cooling and heating solution that is compact in physical size. Areas that have a large heating or cooling requirement may be serviced by either a small number of large fan coil units 4.
Positioning: Fan coil units are available in many guises, including with a self-finish galvanized steel chassis or a painted casing, lending themselves to either concealed installation or, should there be no available space for false ceilings, walls or architectural casings, exposed installation.
Sound levels: Fan coil unit systems correctly installed with the optimum quantity of quality diffusers produce little unwelcome. It may be argued that fan coil unit systems are desired over silent cooling and heating solutions since they produce a background sound level that is both low enough not to be intrusive but sufficiently high to provide privacy between adjacent rooms.
Larger fan coil units operating at lower speeds and with attenuators fitted may be selected to satisfy more stringent acoustic requirements. Fan coil units may even be utilized to satisfy the thermal requirements of hotel rooms during the night, providing cooling and heating at a sound level conducive to uninterrupted sleep. AHUs have several sections for reheating and even humidifying.
Moreover, AHUs can have several fans or blowers installed in its system. FCUs have a different approach to blowers. Because of its small size, their fans are usually placed within the same space as the unit itself. The result is a minor uncomfortable noise that can be heard within the vicinity. This could be regarded as the single most advantageous flaw of the FCU system.
Summary: 1. Cite APA 7 ,. Difference Between Similar Terms and Objects. MLA 8 ,. AHU unit is very useful in commercial and industrial. Buildings and infrastructure in general, large central air-conditioning. And the central compressor and air-conditioning condenser unit. Evaporator connected to the furnace air-handling equipment. Delivery and movement around the site. Can require specialist handling equipment and resource.
Type of building installed. Commercial buildings, Industrial buildings, Office buildings, Hotels, Schools. Usually, Plinth on the floor or can be a high level but require additional supports. Easy, unless at high level then more complex due to size and weight of components. Operating costs. Minimal as long as commissioned and set up correctly.
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