Ventilation - Indoor Environmental Quality - page 360

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Questions
1. What is general dilution ventilation? Under what circumstances is it used?
2. What is natural ventilation?
3. Describe the forces responsible for infiltration-/exfiltration-induced air ex-
change in buildings.
4. Under what atmospheric conditions is building air exchange in a closed
residence at its highest value? Its lowest?
5. Use Equations 11.2 to 11.4 to calculate the air exchange rate in a building
when C t = 400 ppmv CO 2 , C 0 = 1500 ppmv CO 2 , and t = 2 hours.
6. What factors contribute to ventilation system imbalances in large buildings?
7. Describe ventilation air flow through an air handling unit, into a conditioned
space, and from and into outdoor air.
8. What is short circuiting? What factors contribute to it?
9. Describe differences between continuous and variable air volume HVAC sys-
tems and advantages and disadvantages of each.
10. How are ventilation guidelines and standards used to assure low odor and
relatively good human comfort in mechanically ventilated buildings?
11. What is a unit ventilator? Under what conditions is it used?
12. Describe the Ventilation Rate Procedure; under what conditions is it used?
13. Describe Indoor Air Quality and Perceived Air Quality Procedures and their
potential for being used to better ventilate buildings.
14. What is flushout ventilation? How is it used?
15. What is demand-controlled ventilation? How does it work?
16. What is ventilation efficiency? What factors affect it?
17. Why does cross-contamination occur in buildings?
18. What factors increase the risk of contaminant re-entry into buildings?
19. What is entrainment? How does it differ from re-entry and cross contamination?
20. How effective is general dilution ventilation in reducing SBS-type symptom
complaints in buildings?
21. What factors confound the evaluation of the effectiveness of general dilution
ventilation in mitigating SBS-type symptom complaints?