Page 464 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

14.5 Practice Problems 445

The carbon dioxide concentration of the supply air is 400 ppmv. Supply air has
a temperature of 10 °C a relative humidity of 70 %. Heat loss through the
building shelter is 2 kW and heat gain from equipment and lights are 1.5 kW.
It is desired to maintain an indoor carbon dioxide concentration of less than
800 ppmv, relative humidity of less than 50, and room temperature of 20 °C,
what should the minimum ventilation be for the air?
3
6. Consider a tire center with a volume of 1,000 m where tire continuously emit
VOC at a rate of 100 µg/s. Assume at time zero, indoor VOC concentration is
3
3
1,000 µg/m . The HVAC system works at a fresh air flow rate of 100 m /min
and an internal recirculating flow rate of 1/3 of that of the intake fresh air. An
3
internal air cleaner has a flow rate of 0.1 m /s; ignore the outdoor source of
VOC. The fresh air is free of VOC and recirculating activated carbon filter
efficiency is the same as that of the internal air cleaner, which is 90 %. Plot the
indoor VOC concentration over time.

References and Further Readings

1. US EPA (2005) IAQ tools for schools: actions to improve indoor air quality, EPA 402-F-05-
016. http://www.epa.gov/iaq/schools/actions_to_improve_iaq.html
2. Zhang Y (2004) Indoor air quality engineering. CRC Press, FL, USA
3. Lippmann M (1988) Asbestos exposure indices. Environ Res 46:86–106
4. Dodson RF, Atkinson MAL, Levin JL (2003) Asbestos fiber length as related to potential
pathogenicity: a critical review. Am J Ind Med 44:291–297
5. Estévez Sánchez AM, Fernández Tena A, Márquez Moreno MC (1989) Oxidation of methanol
to formaldehyde on iron-molybdenum oxide catalysts, with and without chromium as a
promoter. React Kinet Catal Lett 38(1):193–198
6. Gerberich HR, Seaman GC (2004) Formaldehyde. In: Kroschwitz JI, Howe-Grant M (eds)
Kirk-Othmer encyclopedia of chemical technology, vol 11, 5th edn. Wiley, New York,
pp 929–951
7. WHO (2010) WHO guidelines for indoor air quality: selected pollutants
8. ASHRAE (2013) ASHRAE handbook: fundamentals. ASHRAE (American Society of
Heating, Refrigerating and Air-Conditioning Engineers), Atlanta
9. Gatley DP (2004) Psychrometric chart celebrates 100th anniversary. ASHRAE J 46(11):16–20
10. Shair FH, Heitner KL (1974) Theoretical model for relating indoor pollutant concentrations to
those outside. Environ Sci Technol 8(5):444–451
11. ACGIH (2013) TLVs and BEIs, publication #0113, American conference of governmental
industrial hygienists, Cincinnati
12. Feng Z, Long Z, Chen Q (2014) Assessment of various CFD models for predicting airflow and
pressure drop through pleated filter system. Build Environ 75:132–141
13. Chen C, Lin C-H, Long Z, Chen Q (2014) Predicting transient particle transport in enclosed
environments with the combined CFD and Markov chain method. Indoor Air 24:81–92
14. Liu W, Wen J, Lin C-H, Liu J, Long Z, Chen Q (2013) Evaluation of various categories of
turbulence models for predicting air distribution in an airliner cabin. Build Environ
65:118–131