AIR & WATER AND ALL WATER AIR CONDITIONING SYSTEM BASIC INFORMATION AND TUTORIALS



Air-and-water Systems
Another group of systems, air-and-water systems, provide all the primary ventilation air from a central system, but local units provide additional conditioning. The primary ventilation system also provides most, or all, of the humidity control by conditioning the ventilation air.

The local units are usually supplied with hot or chilled water. These systems are particularly effective in perimeter spaces, where high heating and cooling loads occur.

Although they may use electric coils instead of water, they are grouped under the title “air-and-water systems.”

For example, in cold climates substantial heating is often required at the perimeter walls. In this situation, a hot-water-heating system can be installed around the perimeter of the building while a central air system provides cooling and ventilation.


All-water Systems
When the ventilation is provided through natural ventilation, by opening windows, or other means, there is no need to duct ventilation air to the zones from a central plant. This allows all processes other than ventilation to be provided by local equipment supplied with hot and chilled water from a central plant.

These systems are grouped under the name “all-water systems.”

The largest group of all-water systems are heating systems. The detailed design of these heating systems is covered in the ASHRAE course Fundamentals of Heating Systems.

Both the air-and-water and all-water systems rely on a central supply of hot water for heating and chilled water for cooling. The detailed designs and calculations for these systems can be found in the ASHRAE course Fundamentals of Water System Design


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