scholarly journals Demonstration and evaluation of plastic bag streamlining on highway trucks for drag reduction and energy savings. Final report

1982 ◽  
Author(s):  
A.E. Carden
Keyword(s):  
Drag Reduction ◽  
Energy Savings ◽  
Final Report ◽  
Plastic Bag

Air Layer on Superhydrophobic Surface for Frictional Drag Reduction

2020 ◽  
Vol 64 (02) ◽  
pp. 118-126
Author(s):  
Bradley C. Peifer ◽  
Christopher Callahan-Dudley ◽  
Simo A. Makiharju
Keyword(s):  
Drag Reduction ◽  
Superhydrophobic Surface ◽  
Energy Savings ◽  
Surface Hydrophobicity ◽  
Net Energy ◽  
Frictional Drag ◽  
Gas Flux ◽  
Still Images ◽  
Painted Surface ◽  
Air Layer Drag Reduction

We examined the feasibility of combining a superhydrophobic surface (SHS) and air layer drag reduction (ALDR) to achieve the frictional drag reduction (DR) shown achievable with traditional ALDR, but at a reduced gas flux to increase the achievable net energy savings. The effect of a commercial SHS coating on the gas flux required to maintain a stable air layer (AL) for DR was investigated and compared with that of a painted non-SHS at Reynolds numbers up to 5.1 X 106. Quantitative electrical impedance measurements and more qualitative image analysis were used to characterize surface coverage and to determine whether a stable AL was formed and maintained over the length of the model. Analysis of video and still images for both the SHS and painted surface gives clear indications that the SHS is able to maintain AL consistency at significantly lower gas flux than required on the non-SHS painted surface. Hydrophobicity of the surfaces was characterized through droplet contact angle measurements, and roughness of all the flow surfaces was measured. The results from these preliminary experiments seem to indicate that for conditions explored (up to Rex = 5.1 X 106), there is a significant decrease in the amount of gas required to establish a uniform AL (and hence presumably achieve ALDR) on the SHS when compared with a hydraulically smooth painted non-SHS.

scholarly journals Empirical impact evaluation of the energy savings resulting from BPA's Stage II irrigation system retrofit program: Final report

1987 ◽  
Author(s):  
B.J. Harrer ◽  
J.W. Tawil ◽  
A.J. Lyke ◽  
L.A. Nieves ◽  
E.S. Edin ◽  
...  
Keyword(s):  
Impact Evaluation ◽  
Energy Savings ◽  
Irrigation System ◽  
Stage Ii ◽  
Final Report

scholarly journals How Are the Smart Readiness Indicators Expected to Affect the Energy Performance of Buildings: First Evidence and Perspectives

2020 ◽  
Vol 12 (22) ◽  
pp. 9496
Author(s):  
Paris A. Fokaides ◽  
Christiana Panteli ◽  
Andri Panayidou
Keyword(s):  
Energy Efficiency ◽  
European Commission ◽  
Energy Savings ◽  
Energy Performance ◽  
Final Report ◽  
Building Sector ◽  
Energy Performance Of Buildings ◽  
First Results ◽  
European Standards

In 2018, the European Commission adopted the Smart Readiness Indicator (SRI) concept in the recast of the directive on the energy efficiency of buildings. The set of SRIs is a measure of the intelligence of buildings systems, and its promotion is expected to contribute to the energy savings of the building sector. These indicators are relatively new and were developed only at the beginning of last decade, within European standards. This study introduces and elaborates on these indicators, as delivered in the final report of the European Commission. Some first results, which are obtained using a tool developed by the European Commission, are also presented. The work identifies gaps and perspectives for improvement of this system, as well as predicting the evolution of its implementation in the coming years, through specific numerical scenarios.

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