We want to create a healthy and sustainable environment in the facilities that our children occupy. Good HVAC design considers space air conditioning loads, building usage, ventilation requirements, duct and pipe sizing, air and water pressure drops through heat exchangers, occupancy diversity, system controllability, as well as owner maintenance, energy and system performance expectations.
HVAC design offers the engineer an opportunity for creativity that is not available in the other disciplines, which are more rigid and code-driven. We go beyond meeting minimum code requirements by looking at the system life cycle cost. We pride ourselves on selecting the optimum systems that are energy efficient, cost effective, maintainable and easily expandable. Sometimes, this means designing heat exchangers and thermal energy storage tanks and taking advantage of the utilities’ time-of-use rate structures to save money. Other times, it means utilizing complex setpoint reset schemes to allow the systems to utilize demand limiting and load shedding. Equipment that runs at part load does not have to work as hard and lasts longer.
We do not use “canned specifications” provided by manufacturers for our controls sequencing because the one-size-fits-all approach to controls can’t possibly apply to all facilities. Doesn’t an elementary school have different air conditioning needs from a high school? We utilize Boolean logic with logic gates on our drawings to ensure that our energy saving measures are incorporated into the construction of the project.
Each sequence is unique, because it considers the individual space usage and requirements. We identify all opportunities for energy savings and pursue them. More importantly, prior to final completion of the project, we verify that the sequencing has been implemented.