The author focuses on how humidity control affects the IAQ of the modern workplace environment. Studies cited show the effect that controlled relative humidity levels has on absenteeism and productivity. Overall benefits of hvac renovation to improve IAQ are reviewed, as well as current humidity control technologies and their applications.
The IU Chemistry Building was not using chilled water efficiently. The problem was corrected by installing variable-speed drives on the chilled-water pumps and resetting the control valve differential for better control, energy savings, and improved chilled-water temperature changes.
Treating pressure vessels and equipment as an asset involves establishing a mindset that is proactive towards maintenance, upkeep, and repair (as opposed to waiting until the warning signs are flashing). In the long run, proactive, not reactive, planning saves in more ways than one.
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.