3 ms·
You want air changeover. Low changes/hr leads to high indoor co2 and is just in general bad for you. "ASHRAE empirical research determined that "acceptability"
by TylerE 3y ago
You want air changeover. Low changes/hr leads to high indoor co2 and is just in general bad for you.
"ASHRAE empirical research determined that "acceptability" was a function of outdoor (fresh air) ventilation rate and used carbon dioxide as an accurate measurement of occupant presence and activity. Building odors and contaminants would be suitably controlled by this dilution methodology. ASHRAE codified a level of 1,000 ppm of carbon dioxide and specified the use of widely available sense-and-control equipment to assure compliance. The 1989 issue of ASHRAE 62.1-1989 published the whys and wherefores and overrode the 1981 requirements that were aimed at a ventilation level of 5,000 ppm of carbon dioxide (the OSHA workplace limit), federally set to minimize HVAC system energy consumption. This apparently ended the SBS epidemic."
https://en.wikipedia.org/wiki/Sick_building_syndrome https://en.wikipedia.org/wiki/Sick_building_syndrome
- SirMaster 3y agoWindow mounted units which are the most common don't cycle air either. They have an inside the room loop and an outside the room loop. Same with mini-split systems and central AC systems. The vast majority of AC systems don't cycle air for their heat transfer. Not saying that cycling fresh air isn't important, but I don't necessarily think it's the job of the heat pump to do that.