Records the default button state of the corresponding category & the status of CCPA. This cookie is managed by Amazon Web Services and is used for load balancing. These cookies ensure basic functionalities and security features of the website, anonymously.Ĭloudflare sets this cookie to identify trusted web traffic. Necessary cookies are absolutely essential for the website to function properly. A drain line will also need to be connected to drain this water away.Īfter the air has passed across the coils, it enters into the discharge plenum and distributed into the small diameter ducts for localised distribution. This condensed liquid will run off the coil and collect in the drip tray at the bottom. The cooling coil will remove the moisture from the air. If a cooling coil is used, it can generate a lot of condensation where the warm moist air is condensing onto the cold surface of the coil.
However, electrical heaters can be used for heating purposes and some coils use a direct expansion coil fed by a refrigeration system for cooling. The coil heat exchangers will typically utilise a hot and/or chilled water supply which is distributed from the buildings boilers and chillers.
Some units will be heating only, some will be cooling only and others will have both heating and cooling capabilities. They are just coil heat exchangers which simply heat the air up or cool it down, depending on the requirements for the local environment. The fans then force the air through the heating and/or cooling coils. The fans are usually quite small, only ~80 watts. Driving these fans is a small electrical motor. Typically a fan coil will have 1-3 fans inside depending on the size. Once that air is pulled through the filters it enters into the fans. The filters can just be pulled off to be cleaned or they can be replaced. The air enters via the back through a filter to clean the air from dust etc. You can see where it gets it’s name from because it basically just a fan and a coil heat exchanger.
Otherwise the main return duct will suck this air in and take it back to the AHU.įan Coil Units are a fairly simple design. Once in the void the return air will mix with the fresh air and be pulled into the fan coil unit. Some of the freshly treated air can be wasted by being pulled directly back into the void even though it hasn’t been of any use to the room. Otherwise it will be pulled back into the fan coil unit via a grille in the false ceiling. It will either be sucked into the return grille and be sucked back into the AHU via the return duct. Once the air enters into the room it will provide the heating/cooling to the occupants or equipment inside. The fan will force the air across the heating and/or cooling coils before forcing it our through the localised diffusers. There is a reason for that, which we’ll look at later.Ī motorised fan will suck the fresh air into the fan coil unit. This fresh air is directed into the back side, the inlet, of the fan coil unit but this branch isn’t usually directly connected to the unit, there is a gap between the two. Each room will need a certain volume of fresh air supply per hour. Branches will come off of this and they will feed fresh air into each room. These run out all over the building taking the shortest route for efficiency. In this model you can see the main AHU which is supplying fresh air to the building via the main supply duct.
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