Greenheck’s new Model PVe heat recovery unit is designed to recover up to 60% of the sensible energy in the exhaust airstream and return it to the supply air. The cross-flow plate exchanger unit uses an aluminum core (plate) to recover only sensible energy, and has very low leakage and no moving parts. Features include stainless steel drain pans, easy to remove hinged doors, belt drive blowers with adjustable pulleys, a pitched roof, and integral lifting points and lift locations. Model PVe is ideal for applications that involve dirtier air such as garage exhaust, welding shops/facilities and areas with drier climates. Performance ranges from 1,000 to 6,000 cfm.
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.