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Extra resources for AG31-004 - School HVAC Design Manual
Fan coils or small air handling units can service gyms, libraries and other large areas. Condensate Issues Fan coils will generate condensate while cooling in most climates. The units have drain pans that need to be field trapped and drained. Both the trap and the slope required for draining must be taken into consideration. Ceiling units will require condensate lines above the ceiling. Refer to Figure 19 for a condensate sizing chart. Application Guide AG 31-004 31 Central Outdoor Air Ventilation Systems General Several HVAC systems such as WSHPs and fan coils require dedicated outdoor air systems to meet the classroom ventilation requirements (typically 450 cfm per classroom).
Return air from the classroom will mix with the outdoor air and the additional cooling load from the outdoor air will be placed on the fan coil or WSHP. In this case the load is all latent and is 19,000 btu/hr. Most terminal systems are not designed for such a high amount of latent cooling. The unit will have to be oversized which can add to noise concerns. Figure 25, Outdoor supplied At 55° °F db Air Figure 25 shows another approach. The outdoor air is cooled to 55°F, which is the dewpoint for the classroom design to deal with the latent portion of the ambient air.
To work properly, central systems require a reasonable sophisticated Building Automation System (BAS). The energy disadvantage of central systems is the large amount of fan power required to distribute the air. Multiple Zones Central systems differentiate themselves from decentralized systems in that one system serves many zones (classrooms). Because the needs of each classroom will not always be the same, some manner of adjustment must be built into the central system. The two parameters that can be varied in a central system are supply air temperature and/or supply air volume.