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chimney guys

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residential chimneys have problems of smoke flow returning into the home ... minimum cross-sectional area ratio of the chimney flue and fireplace opening ... – PowerPoint PPT presentation

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Title: chimney guys


1
chimney guys
  • flow rate, average heat transfer coefficient,
  • and total heat transfer rate

andrew enke steve jensen
2
background
  • residential chimneys have problems of smoke flow
    returning into the home
  • 1/8 rule minimum cross-sectional area ratio of
    the chimney flue and fireplace opening
  • chimney efficiency decreases if chimney height is
    too short or too tall

3
procedure
  • grandmas chimney
  • H 8.2 m
  • D .152 m
  • A .0182 m2
  • Tm,i 17.8 C
  • Tm,0 208 C
  • u 1.6 m/s

steves chimney H 3.7 m D .203 m A .0324
m2 Tm,i 23 C Tm,0 223 C u 2.3 m/s
4
results
5
conclusion
  • grandmas chimney
  • hbar(W/m2-K) 1.6885
  • q (W) 5088.3287
  • q" (W/m2) 11.0705
  • Q (m3/s) measured 0.0301
  • Q (m3/s) predicted 0.0292
  • steves chimney
  • hbar(W/m2-K) 2.4355
  • q (W) 1368.7902
  • q" (W/m2) 586.2287
  • Q (m3/s) measured 0.0437
  • Q (m3/s) predicted 0.0746
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