28 Nov '14, 10am

Revisiting an Energy Saving Handbook from 1979

Revisiting an Energy Saving Handbook from 1979

Morrison’s estimates of the average natural air changes per hour in older homes was probably accurate. By today’s standards, however, the houses that Morrison describes are extremely leaky. These natural air exchange rates — 1 ach ACH stands for Air Changes per Hour. This is a metric of house air tightness. ACH is often expressed as ACH50, which is the air changes per hour when the house is depressurized to -50 pascals during a blower door test. The term ACHn or NACH refers to "natural" air changes per hour, meaning the rate of air leakage without blower door pressurization or depressurization. While many in the building science community detest this term and its use (because there is no such thing as "normal" or "natural" air leakage; that changes all the time with weather and other conditions), ACHn or NACH is used by many in the residential HVAC industry for their syste...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/re...

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By Stephen Edelstein 62 views Nov 28, 2014 Reddit This! Share on Facebook Share on Twitter Golden Gate Bridge, connecting ...