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Coil heaters

Technical information Air-Conditioning Fan coil units

Fan-coils

As its name implies, the unit consists of a heat exchanger, in which water circulates and fan filter select and simple controls designed for perimeter walls units Fig. 25.8 or ceiling units are mounted in a ceiling void. Ceiling blocks can be configured as a cassette, drawing air into the center and unloading at the periphery. Heating elements, electric, hot water or steam can be included.

Chilled water is a number of air-handling units, each the size of a suitable areas where conditions throughout the area can be satisfied by the air flow of the air conditioner. It offers a wide choice of comfortable conditions in the space, with units serving one room or part of a room. The coil is normally operated with fin temperature below room temperature of dew point, so that some latent heat is removed, coil, which requires a condensate drain. Multi-speed fans usually, so that you can reduce the noise times a light load.

The advantage of this system are

  • Individua

    l control zone or office, including heating in some of the zones and cooling in other
  • The relatively low cost of conventional units
  • Simple control system
  • Built in standby capacity, in which several units are in the same zone.

disadvantages

  • Limited flexibility in conventional units - all operating parameters established by the manufacturer
  • Usually only simple dry-bulb temperature control is carried out, although some specialized units, the introduction of electronic control systems and humidifiers
  • Limited control of fresh air inlet, if any, so that the advantage of free cooling cannot be accepted
  • Noise levels can be above, than Central air Conditioners
  • Limited control air distribution
  • Visibility blocks and connecting chilled water services can be a problem
  • Maintenance and servicing can disrupt the occupants of the room, and there is a risk of damage to the room cloth into force of all services and connections in the room.
Primary (fresh) air supply can be used to call the number (Central) air circulation. This air at a pressure of 150-500 PA, is released through the nozzle in the coil Assembly, and the resultant velocity at the outlet from 16 to 30 m/s seizes or induces the air in the room to give the total circulation in four or five times more than the initial offer. This additional air passes over the chilled water coil. Most induction units wall for perimeter cooling, Fig. 25.9, but they were adapted for ceiling mounting. Induction units, latent heat production can usually be handled by the primary air and they work with dry coils. Some systems have been installed in having a high latent load that removal of a condensate on a spool.

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