To determine the system’s air-handling requirement, the designer must consider the function and physical characteristics of the space to be conditioned and the air volume…

The methods used to humidify air include • Direct spray of recirculated water into the airstream (air washer) reduces the dry-bulb temperature while maintaining an…

The basic methods used for cooling include • Direct expansion, which takes advantage of the latent heat of the fluid, as shown in the psychrometric…

Air-handling equipment is available as packaged equipment in many configurations using any desired method of cooling, heating, humidification, filtration, etc. In large systems (over 25…

The basic secondary system is an all-air, single-zone, air-conditioning system consisting of an air-handling unit and an air distribution system. The air-handling unit may be…

Designers have considerable flexibility in selecting the supply air temperature and corresponding air quantity within the limitations of the procedures for determining heating and cooling…

Although steam is an acceptable medium for central system preheat or reheat coils, low-temperature hot water provides a simple and more uniform means of perimeter…

Exterior zones are affected by varying weather conditions wind, temperature, and sun and, depending on the geographic area and season, may require both heating and…

An ALL-AIR SYSTEM provides complete sensible and latent cooling, preheating, and humidification capacity in the air supplied by the system. No additional cooling or humidification…