In building energyefficient homes many contractors are now a

In building energy-efficient homes, many contractors are now adopting the Passive House Standard - a strict building code developed in Germany in 1996. The Passive House Standard for air infiltration is no more than 0.6 AC (air changes per hour). The formula for calculating ACH is: ACH = 60L/V L is the air leakage in cubic feet per minute (cfm) V is the volume of the house in cubic feet Use this formula to determine what the air leakage would have to be in order to achieve an ACH of 0.6 in a 22,400-cubic-foot house.

Solution

ACH = 60L/V

given,

ACH = 0.6,

v= 22400 cubic foot

Plugging values in the given formula we have,

0.6= 60*L/ 22400

=> L= 22400*0.6/60

= 224 cubic feet per minute