Air Leakage and Ventilation Problem: Blower Door Test A blower door test was conducted during an ecoENERGY audit on a leaky old 1920’s solid masonry house in Toronto. The results indicated that the house experienced 7.28 ACH (air changes per hour) at 50 Pascals of de-presurization. The house measures 12m wide by 10m long, and 8m tall (above grade) and 3m below grade depth. The attic was sealed off during the test and can be ignored. If the house is heated with electricity at a total cost of $0.10/kWh, calculate the cost of the uncontrolled air leakage, accounting for both heating the air (sensible heat) and the humidification (latent heat) under an every- day pressure difference caused by wind and stack effect, over the month of January (31 days). To convert the 50 Pascal air leakage rate to a normal every-day pressure air leakage rate, several wise building scientists suggested taking 5% of the 50 Pascal leakage as a reasonable approximation. Assume the indoor conditions to be 20oC and 35% rh, and outside to be an average -5oC and 65% rh, while the total atmospheric pressure is 101.325 KPa
Air Leakage and Ventilation Problem: Blower Door Test A blower door test was conducted during an ecoENERGY audit on a leaky old 1920’s solid masonry house in Toronto. The results indicated that the house experienced 7.28 ACH (air changes per hour) at 50 Pascals of de-presurization. The house measures 12m wide by 10m long, and 8m tall (above grade) and 3m below grade depth. The attic was sealed off during the test and can be ignored. If the house is heated with electricity at a total cost of $0.10/kWh, calculate the cost of the uncontrolled air leakage, accounting for both heating the air (sensible heat) and the humidification (latent heat) under an every- day pressure difference caused by wind and stack effect, over the month of January (31 days). To convert the 50 Pascal air leakage rate to a normal every-day pressure air leakage rate, several wise building scientists suggested taking 5% of the 50 Pascal leakage as a reasonable approximation. Assume the indoor conditions to be 20oC and 35% rh, and outside to be an average -5oC and 65% rh, while the total atmospheric pressure is 101.325 KPa
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Air Leakage and Ventilation Problem: Blower Door Test
A blower door test was conducted during an ecoENERGY audit on a leaky old 1920’s solid masonry
house in Toronto. The results indicated that the house experienced 7.28 ACH (air changes per hour) at
50 Pascals of de-presurization. The house measures 12m wide by 10m long, and 8m tall (above grade)
and 3m below grade depth. The attic was sealed off during the test and can be ignored. If the house is
heated with electricity at a total cost of $0.10/kWh, calculate the cost of the uncontrolled air leakage,
accounting for both heating the air (sensible heat) and the humidification (latent heat) under an every-
day pressure difference caused by wind and stack effect, over the month of January (31 days). To
convert the 50 Pascal air leakage rate to a normal every-day pressure air leakage rate, several wise
building scientists suggested taking 5% of the 50 Pascal leakage as a reasonable approximation. Assume
the indoor conditions to be 20oC and 35% rh, and outside to be an average -5oC and 65% rh, while the
total atmospheric pressure is 101.325 KPa
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