By Roskam J.
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Extra info for Airplane design, vol.8 and errata (1990)
Most mechanical equipment can be supplied with or without factory-mounted controls. Unit ventilators, WSHPs, fan coils, chillers, air handling units, vertical self-contained and rooftop equipment all can be supplied with controls. In the past, integrating them into BAS has been a problem. Interoperability now allows easy integration. Factory supplied equipment controls offer: • A controller specifically designed and programmed for the particular piece of equipment and the application. • A full run factory test to demonstrate that the unit and controls are functioning properly.
This will have the affect of raising the RH in the classroom about 5%. 5°F. For most engineers, the process of calculating zone air volumes is computerized. However it is important to understand the process and to understand how data input into the program will affect the output. Application Guide AG 31-004 45 Optimal Air Temperature Design Typical central system design is based on cooling the air to 55°F leaving the cooling coil. This is arrived at because 55°F is the dewpoint for the space design condition of 75°F and 50% RH.
The centralized approach has the advantage of distancing the mechanical equipment from the occupants, thereby reducing sound issues. Locating the equipment remotely also allows service to be performed without interfering with the occupants. Central systems generally allow airside economizers to be integrated into the design. The economizers allow the equipment to supply the high amounts of outdoor air needed in school designs. A separate, standalone outdoor air system is usually not required. Diversity can also be built into the central system to reduce operating costs.