Ventilation and IAQ

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Last month, this column addressed the fact that VAV terminal units are substantially more “variable” than even their name implies.

It’s a common fact that school students flourish better in comfortable learning atmospheres without distraction.

If anyone has commissioned anything, it is very likely they have commissioned at least one VAV hot water reheat terminal unit.

When the school bell rings in the morning, bodies fill the classrooms. During lunch, classrooms empty and lunchrooms fill.

There is universal agreement that homo sapiens, or humans, are at the top of the food chain because of our big brains. The downside is big brains are big drains.

I recently commissioned a project that involved replacing eighty 2-pipe, dual-temperature fan-coil units in a nearly 40-year-old high-rise condominium.

While in Las Vegas at the ASHRAE conference and AHR Expo, I visited the colossal Hoover Dam built over a remarkably short time of five years (1931 to 1936).

Each year, the AHR Expo honors HVACR manufacturers with its Innovation Awards.

Engineers retrofitting non-air conditioned schools to variable refrigerant flow (VRF) the last few years have relied on centralized packaged DOAS to comply with ASHRAE 62.1 outdoor air standards.

With last month’s publication, Engineered Systems magazine and I completed the 25th year of publishing this column.