a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters. A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters. A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems
Section: Chapter Questions
Problem 18RQ: Explain how carbon dioxide levels can be used to estimate the occupancy level in a particular area...
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a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters.
A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
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