By Wang S.K.

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The amount of outdoor air required for metabolic oxidation is rather small. 3 cfm/ft2 15 25 These requirements are based on the analysis of dilution of CO2 as the representative human bioeffluent to an allowable indoor concentration of 1000 ppm. Field measurements of daily maximum CO2 levels in office buildings reported by Persily (1993) show that most of them were within the range 400 to 820 ppm. 055 Exposure 24 24 1 8 hr hr hr hr 1 year 3 months Here exposure means average period of exposure.

Equip with a terminal that mixes the supply air with the space air or air from the ceiling plenum. During the cool-down period, due to the high dew point temperature of the plenum air when the air system is started, the supply air temperature must be controlled to prevent condensation. 1 The worship hall of a church uses a package system with a basic air system. The summer space sensible cooling load is 75,000 Btu/hr with a latent load of 15,000 Btu/hr. Other design data for summer are as follows: Outdoor summer design temperature: dry bulb 95°F and wet bulb 75°F Summer indoor temperature: 75°F with a space relative humidity of 50%: Temperature rise: fan power 2°F supply duct 2°F Relative humidity of air leaving cooling coil: 93% Outdoor air requirement: 1800 cfm Determine the 1.

For convenience in analysis, sound frequencies are often subdivided into eight octave bands. An octave is a frequency band in which the frequency of the upper limit of the octave is double the frequency of the lower limit. An octave band is represented by its center frequency, such as 63, 125, 250, 500, 1000, 2000, 4000, and 8000 Hz. On 1000 Hz the octave band has a higher limit of 1400 Hz and a lower limit of 710 Hz. Human ears do not respond in the same way to low frequencies as to high frequencies.

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