Pressure independent control valves proved to be a key in wringing the benefits out of smartly managed chilled water temperature, but that wasn’t all. Airside energy recovery, desiccant dehumidification to eliminate reheat in operating room environments, and upgrading to ECM fan systems have all contributed to this hospital’s fiscal wellness.
Rosenberg has released four new axial fans, complete with shrouds and finger guards for HVAC condenser applications. The fans are designed with profiled aluminum blades with winglet tips that aim to reduce noise and improve fan performance.
The IC20 Drop-In fan from Zoo Fans is designed specifically for drop ceiling (T-bar) spaces with ceiling heights from 8 ft to 20 ft. The patent-pending diffuser has an integrated jet ball exhaust that is easy to adjust to direct the airflow.
MacroAir says it has improved on high volume, low speed (HVLS) fan technology with its new product line called AirVolution-D. MacroAir’s AirVolution-D is powered by a motor technology called D-Drive, which is a compact electric motor capable of handling the consistent torque requirements of a 24-ft diameter industrial fan. At the heart of AirVolution-D is a motor design which the company says delivers 50% more mechanical horsepower and 75% more wind power than current HVLS fans on the market.
A few are more familiar and worth a reminder, while some are pretty sneaky. Others may have gotten there before the first occupant. In any event, any “sustainable facility” can sustain IAQ damage without attention to these sorts of risks.
Five sizes of Rosenberg's electronically commutated (EC) backward curved fans are now available with 5.5 kW motors for greater power and efficiency. The new fans feature three-phase motors with nominal input voltages of 230V and 460V. They are 100% speed controllable and are CE, UL, and RoHS approved.
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.