30 Aug '15, 4pm

I get asked this quite often about ventilating a performance home.. this article answers most of those questions.

ERVs are designed to provide energy savings in mechanical ventilation systems. They recycle energy from the building’s exhaust air to pretreat the outside air/ventilation air. This preconditioning of outside air reduces the load the HVAC unit must handle, and hence reduces the required capacity of the mechanical equipment. The general rule for ERV pretreatment of ventilation air is that there is an HVAC equipment reduction of 2.5 tons (2.3 metric tons) for each 1,000 cubic feet per minute (CFM) of outdoor air handled by an ERV. For example, instead of installing a 75-ton (68-metric-ton) cooling system for a project that requires 40 percent outdoor air (12,000 CFM outdoor air and 18,000 CFM return air), one conceivably could install a 12,000-CFM ERV and a 45-ton (41-metric-ton) HVAC unit to work together. This reduction in the size of the HVAC equipment helps offset the ini...

Full article: http://www.ecobuildingpulse.com/products/the-facts-about-...

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