For a small house located in Ottawa, Ontario, there are three windows and three doors.You are assigned the task of determining the infiltration and related heat loss rates.It has been found experimentally that the pressure difference due to pressurization is -0.002 in. water. The pressure difference due to stack effect for this building is assumednegligible due to it having only a single floor. The dominant mean wind speed fordesign is assumed to be 15 mph. The house orientation is such that it is normal to thedominant mean wind direction.The house was built recently and all of the windows and doors are tight fitting. Thehouse construction and materials are typical for Ottawa, Ontario. The doors are 3 ftwide and 6.75 ft high. Each of the windows is double hung and each window has thefollowing overall dimensions: 3 ft wide and 4 ft high. (For clarity it is noted that eachdouble hung window has two glass segments that are 3 ft wide and 2 ft high.)The indoor design temperature is 70ºF and the indoor design absolute humidity is 0.005lbm moisture per lbm dry air. The outdoor design temperature for heating is based on the99.6% value for Ottawa. Also, the outdoor design absolute humidity is approximated aszero.a) For the house, evaluate the design infiltration rate of air (in cfm) from the outside.b) Determine the sensible heat loss rate (in Btu/hr) from the house due to infiltration.c) Determine the latent heat loss rate (in Btu/hr) from the house due to infiltration.d) Calculate the total heat loss rate (in Btu/hr) due to infiltration for the house.
For a small house located in Ottawa, Ontario, there are three windows and three doors.
You are assigned the task of determining the infiltration and related heat loss rates.
It has been found experimentally that the pressure difference due to pressurization is -
0.002 in. water. The pressure difference due to stack effect for this building is assumed
negligible due to it having only a single floor. The dominant mean wind speed for
design is assumed to be 15 mph. The house orientation is such that it is normal to the
dominant mean wind direction.
The house was built recently and all of the windows and doors are tight fitting. The
house construction and materials are typical for Ottawa, Ontario. The doors are 3 ft
wide and 6.75 ft high. Each of the windows is double hung and each window has the
following overall dimensions: 3 ft wide and 4 ft high. (For clarity it is noted that each
double hung window has two glass segments that are 3 ft wide and 2 ft high.)
The indoor design temperature is 70ºF and the indoor design absolute humidity is 0.005
lbm moisture per lbm dry air. The outdoor design temperature for heating is based on the
99.6% value for Ottawa. Also, the outdoor design absolute humidity is approximated as
zero.
a) For the house, evaluate the design infiltration rate of air (in cfm) from the outside.
b) Determine the sensible heat loss rate (in Btu/hr) from the house due to infiltration.
c) Determine the latent heat loss rate (in Btu/hr) from the house due to infiltration.
d) Calculate the total heat loss rate (in Btu/hr) due to infiltration for the house.
Step by step
Solved in 2 steps with 2 images
