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Quantifying Energy Savings by Improving Boiler Operation
Abstract
On/off operation and excess combustion air reduce
boiler energy efficiency. This paper presents
methods to quantify energy savings from switching to
modulation control mode and reducing excess air in
natural gas fired boilers. The methods include
calculation of combustion temperature, calculation of
the relationship between internal convection
coefficient and gas flow rate, and calculation of
overall heat transfer assuming a parallel-flow heat
exchanger model. The method for estimating savings
from changing from on/off to modulation control
accounts for purge and drift losses through the boiler
and the improved heat transfer within the boiler due
to the reduced combustion gas flow rate. The method
for estimating savings from reducing excess
combustion air accounts for the increased combustion
temperature, reduced internal convection coefficient
and increased residence time of combustion gasses in
the boiler. Measured boiler data are used to
demonstrate the accuracy of the methods.
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Citation
Carpenter, K.; Kissock, J. K. (2005). Quantifying Energy Savings by Improving Boiler Operation. Texas A&M University (http://www.tamu.edu); Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /5604.