Sweating in your room on a hot August day does make you wonder how any building could be designed and built without AC. Until the mid-70s, almost all of the residence halls on campus were not air-conditioned, nor was it considered a 'must have.'
While the university has made strides in retrofitting older buildings with air conditioning, such as Bryan Complex, Old Dominion, Barrett, Chandler and DuPont, several factors influence our ability to install AC retroactively:
- Power: Older buildings often need an electrical upgrade to accommodate the AC equipment; buildings were not designed with as many outlets or the capacity to carry the electrical load that comes with modern electronics. All of our buildings meet current safety codes, but there isn't the capacity for adding much else to the building.
- Space: Another critical factor is where to put the system – where do you put the fan coil unit? Do you use ducting, and if so, is there room to run the ductwork in the ceiling? How do you pipe the chilled water into each room? The most important question is where do you put the main equipment and fresh air intakes? Since the windows are closed when you air condition a building, you have to have a way to draw in the outside air, and more importantly, how do you temper the outside air to keep the humidity levels down?
- Building Envelope: You can't air condition a building without considering the building envelope: installing a state-of-the-art system in a building that still has 1950s-era single-pane windows is a waste of energy. An additional consideration is a moisture barrier; brick and cinder block construction will act like a sponge and soak up moisture from hot outside air as you cool a building. When humid air hits a cold surface, such as a chilled water pipe, you get condensation, which can lead to water damage and possible mold.
As a result of the university's experience with several air conditioning retrofits, there are written construction standards that dictate how we go about future installations. Instead of doing piecemeal upgrades, upgrading a building's cooling simultaneously as a comprehensive renovation, as we did with Chandler and Landrum, is much more efficient.
During the renovations, we stripped down the interior to the point where moisture barrier on the exterior walls, ducting, piping, and electrical power could all be installed in the most efficient way possible. Not only does this make maintenance more manageable, the result is more energy-efficient.