30 Sep '13, 8am

[Prod/Sustainablity] Choosing Between an ERV and an HRV

[Prod/Sustainablity] Choosing Between an ERV and an HRV

Don’t get fooled into buying a more expensive and complex system if what you really need is a dehumidifier. Moisture Exchange vs. Moisture Removal Energy-recovery ventilators (ERVs), including the sub-type known as heat-recovery ventilators (HRVs), provide whole-building ventilation while reducing the amount of energy lost during air exchange. An HRV is a simpler system that enables exchange only of sensible heat (energy you can measure with a thermometer); the term “ERV” typically refers to more complex systems that exchange both sensible and latent heat (energy a thermometer can’t detect, typically because it’s being used to effect phase change; see “Dry-Bulb? Wet-Bulb? What’s the Difference? ”). Deciding which type of system you need is not always straightforward; common and misleading assumptions about the ability of ERVs to handle humidity can complicate the issue. Bo...

Full article: http://www.buildinggreen.com/auth/article.cfm/2013/9/30/C...

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