Here, the pressures on the occupants are exceeded only by the weight of the cooling loads. However, underfloor air proves to be a good fit for an unusual setting. Take stock of the requirements, then look for designs that can pay dividends.
UFAD and displacement ventilation systems require accurate estimates to meet relative humidity requirements and ensure efficient operations. Take a look at a few design options, and contemplate the reader challenge at the end.
Since their introduction in Europe in the 1950s, and their domestic rise in specification during the 1990s, UFAD and displacement ventilation systems promise significant energy savings as a direct result of a higher supply air temperature that yields an increase in the use of economizer or free cooling hours.
Patrick Baldwin-McCurdy fields daily indoor air temperature requests from employees and students, but Seattle University’s (SU) lead buildings control technician rarely hears HVAC complaints from the college’s new library addition featuring under floor air distribution (UFAD).
Leaning on experience and data from various K-12 cities and projects, the author pursues some less conventional design approaches. They may revolve around radiant heating and/or cooling, but depending on school size and other factors, the smart use of heat recovery, DOAS, and improved central plants could also put a project on the HVAC honor roll.