Question

During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed house to 1.11 to 1.47 in a loosely air-sealed house.

(a) True

(b) False

I got this question in my homework.

I need to ask this question from Orientation of Building and House Planning in division Planning of Building and Colony of Civil Engineering Drawing

Answer 1

Correct choice is (a) True

Explanation: For residential buildings, which mostly rely on infiltration for meeting their ventilation needs, a common ventilation rate measure is the air change rate (or air changes per hour) the hourly ventilation rate divided by the volume of the space (I or ACH; units of 1/h).

ASHRAE now recommends ventilation rates dependent upon floor area, as a revision to the 62-2001 standard, in which the minimum ACH was 0.35, but no less than 15 CFM/person (7.1 L/s/person). As of 2003, the standard has been changed to 3 CFM/100 sq. ft. (15 l/s/100 sq. m.) plus 7.5 CFM/person (3.5 L/s/person).