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Civil and Environmental Engineering Commons™
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Full-Text Articles in Civil and Environmental Engineering
Simulating Energy Efficient Control Of Multiple-Compressor Compressed Air Systems, Sean Murphy, J. Kelly Kissock
Simulating Energy Efficient Control Of Multiple-Compressor Compressed Air Systems, Sean Murphy, J. Kelly Kissock
Mechanical and Aerospace Engineering Faculty Publications
In many industrial facilities it is common for more than one air compressor to be operating simultaneously to meet the compressed air demand. The individual compressor set-points and how these compressors interact and respond to the facility demand have a significant impact on the compressed air system total power consumption and efficiency. In the past, compressors were staged by cascading the pressure band of each compressor in the system. Modern automatic sequencers now allow more intelligent and efficient staging of air compressors.
AirSim, a compressed air simulation tool, is now able to simulate multiple-compressor systems with pressure band and automatic …
Quantifying Savings From Improved Boiler Operation, Kevin Carpenter, J. Kelly Kissock
Quantifying Savings From Improved Boiler Operation, Kevin Carpenter, J. Kelly Kissock
Mechanical and Aerospace Engineering Faculty Publications
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 …
Estimating Energy Savings In Compressed Air Systems, Chris Schmidt, J. Kelly Kissock
Estimating Energy Savings In Compressed Air Systems, Chris Schmidt, J. Kelly Kissock
Mechanical and Aerospace Engineering Faculty Publications
Compressed air is typically one of the most expensive utilities in an industrial facility. As a result, potential savings opportunities are aggressively sought out and identified. Once identified, projected energy savings must be calculated in order to justify the cost of implementing the savings opportunity. It is important to calculate projected energy and cost savings as accurately as possible. Unfortunately, savings are frequently overestimated because the methods used to estimate savings neglect to consider important factors such as compressor control and type, storage, and multiple compressor operation.
In this paper, a methodology is presented for modeling air compressor performance and …