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So for exterior zones, we started using higher velocity outlets ("rifles") located directly in line with the UFTs. Because of the Coanda effect from both the structural floor below and raised floor above, the air would rifle with little induction out to the UFT, providing colder inlet air.
This is certainly true of UFTs (Figure 3) and standard overhead VAV systems.
This is a significant advantage over typical UFAD designs, in particular UFTs, which require regular filter maintenance.
* Enclosed conference rooms can be provided with individual temperature control using cooling-only UFTs supplying sub-plenums created by full height walls or plenum dividers.
* Costs are similar to and can be lower than the UFT design; duct runs are a bit longer but hot water distribution and the UFTs themselves are eliminated.
Mild fighting can also occur in perimeter conference rooms also served with UFTs.
The reheat losses were minimal due to the warm central system supply air temperature (63[degrees]F [17[degrees]C]) and low UFT airflow rates required due to the warm UFT supply air temperatures (130[degrees]F [55[degrees]C]).
Despite the problems seen in our early designs, we did not abandon the UFT concept; instead we tried various kluges to fix it, including:
Because of the UFTs serving multiple spaces, and the security requirements of the end user (many full-height walls were used), sealing the zone partitions below the floor was important to ensure proper interplenum pressurization.
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