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# chimney guys

chimney guys. flow rate, average heat transfer coefficient, and total heat transfer rate. andrew enke steve jensen. 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

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## chimney guys

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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. grandma’s 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 procedure steve’s 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. grandma’s 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 conclusion steve’s 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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