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Indoor Air Quality Engineering: Environmental Health and Control of Indoor Pollutants

96 SOLVED PROBLEMS

Question: 9.6

Cooling a Hot and Dry Gas Stream A 10,000 ACFM dry (0% water vapor) discharge gas stream containing small particles exits a metallurgical kiln at T1 = 600. °C and p1 = 101. kPa. To capture the particles it is necessary to reduce the gas temperature to T3 = 200. °C and p3 = 101. kPa before passing ...

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The data are summarized below: ρ_1 = P_1(/R...
Question: 10.3

Aerosol Particle Trajectories near a Flanged Round Opening The circular pipe with flanged round opening described in Section 10.3.1 is mounted with its face parallel to the horizon (pipe axis aligned vertically). It is used as a snorkel fume extractor, similar to the one shown in Figure 1.26. Unit ...

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Only the worst-case scenario is considered, i.e. w...
Question: 10.2

Withdrawal of Carbon Monoxide through a Hood in a Ventilated Room Consider the same engine testing laboratory as described in Example 10.1 and as sketched in Figure E10.1a. Despite the clear evidence presented in that example, the architect overrules the chief engineer, and installs the fresh air ...

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The two-dimensional approximation is again employe...
Question: 10.1

Comparison of two Ventilation Configurations in an Engine Laboratory A 4.0 m long by 2.5 m high by 7.0 m wide laboratory is being constructed to test the performance of small lawnmower engines.Seven workbenches, each approximately 1.0 m wide and each with a hood, are to be placed side by side along ...

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Since the geometry is nearly two-dimensional, a 2-...
Question: 4.14

Computation of Henry’s Law Constant from Solubility Data Given: Toluene (M = 92.0) is mixed in water until saturated. From Perry et al. (1984), the solubility of toluene is 0.050 g of toluene per 100. g of water at 16.0 °C and 1.0 atm. To do: Estimate Henry’s law constant for toluene in water. ...

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The mol fraction of toluene in water is x_{...
Question: 9.8

Control of Particles from a Lime Kiln using an ESP The kiln described previously in Example 9.7. The volumetric flow rate of the exhaust gas is 50,000 SCFM, and a collection efficiency of 99.% is sought. In the previous example problem, the actual volumetric flow rate was computed to be 73,100 ACFM ...

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From Table 9.3, the precipitation parameter (w) as...
Question: 4.12

Estimating Evaporation Rate from Fundamental Principles Ethyl mercaptan (CH3CH2SH, CAS 75-08-1) is a liquid with an unpleasant skunk-like odor. The material is a strong oxidizer with a PEL of 0.5 PPM. A 55-gallon drum of the material is handled roughly and a small leak develops in a seam. ...

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It is assumed that the partial pressure of the con...
Question: 4.9

Estimation of the Diffusion Coefficient of Toluene in Air Toluene (C6H5OH, CAS 108-88-3) is a common solvent with a sweet, pungent odor and a PEL equal to 200 PPM. From handbooks and Appendix A.10 the following data can be found: ...

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Substitution of values from the above table into E...
Question: 4.8

Estimation of the Vapor Pressure at an Arbitrary Temperature You are employed in a firm that manufactures Pharmaceuticals. For some products the firm uses pyridine as a solvent. Pyridine (C5H5N, CAS 110-86-1) is a colorless, toxic (PEL = 5 PPM), flammable liquid with an unpleasant odor.For purposes ...

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For clarification, the four temperatures used in t...
Question: 4.6

Emissions From Filling a 5-Gallon Can with Gasoline A new (empty) 5-gallon can (0.019 m³) is filled with gasoline on a day when the temperature of the air and gasoline are 31.5 °C (304.65 K). Gasoline enters the can at a volumetric flow rate of 2.5 GPM. Assume that the properties of gasoline can be ...

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(a) As an upper limit, assume that as soon as fill...
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