Calculating Boiler Radiation Loss from Chimney Gas Analysis

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SUMMARY

The discussion focuses on calculating boiler radiation loss from chimney gas analysis for a 70 kW boiler burning pellets. The chimney gas temperature was measured at 140°C with a CO2 value of 8% and a room temperature of 22°C. Siegert's formula was applied to estimate chimney loss, yielding a result of 11.8. To accurately determine the boiler's radiation loss, additional information, specifically the boiler temperature and its construction characteristics, is necessary.

PREREQUISITES
  • Understanding of Siegert's formula for heat loss calculations
  • Knowledge of boiler operation and efficiency metrics
  • Familiarity with chimney gas analysis techniques
  • Basic principles of thermodynamics related to heat transfer
NEXT STEPS
  • Research the impact of boiler construction materials on radiation loss
  • Learn about advanced chimney gas analysis methods
  • Investigate the relationship between boiler temperature and radiation loss
  • Explore alternative formulas for calculating heat loss in boilers
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Engineers, energy analysts, and technicians involved in boiler design, efficiency optimization, and thermal analysis will benefit from this discussion.

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I analyzed the chimney gas from a 70 kWboiler burning pellets. I found the temperature to be 140C, the CO2 value was 8%, and the room temp was 22C. Is it possible from this to calculate the boilers radiation loss? If not, what other information do I need? I used Siegert's formula to find the chimney loss by 0,8\frac{140-22}{8}=11,8 where 0,8 is a constant used for pellets.
 
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You can actually calculate an upper bound on the heat radiated by the boiler if you knew the temperature in the boiler. Not all of this radiation will contribute to a loss, and that fraction will depend on the construction (materials and geometry) of the boiler.
 

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