Taylor Engineering Inc.

Jacksonville, FL, United States

Taylor Engineering Inc.

Jacksonville, FL, United States
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Liu X.,Taylor Engineering Inc. | Kabiling M.B.,Taylor Engineering Inc. | Bratos S.M.,U.S. Army
Ports 2013: Success Through Diversification - Proceedings of the 13th Triennial International Conference | Year: 2013

Jacksonville Harbor, already a major U.S. port, is presently undergoing a general reevaluation study by the U.S. Army Corps of Engineers-Jacksonville District (USACE-SAJ) that is evaluating various plans to deepen the navigation channel depth from its current depth of 40 feet (12.2 meters) to a maximum depth of 50 feet (15.24 meters) from the river mouth at the Atlantic Ocean to a point 14 miles (22.5 km). Deepening the existing channel would allow for larger vessels to access the Jacksonville Port, thereby reducing transportation costs and providing increased navigational safety while minimizing or avoiding negative impacts to environmental resources. To evaluate the potential impacts of a channel-deepening project on the St. Johns River estuary system, a three-dimensional hydrodynamic and transport model of Jacksonville Harbor was developed by using the Environmental Fluid Dynamic Code (EFDC) model. The EFDC hydrodynamic and salinity model, validated for the Jacksonville Harbor deepening project area, provided the means to assess the direct impacts of channel modifications to salinity and water circulation in the main stem of the lower St. Johns River from various channel-deepening scenarios during a 6-year evaluation period (1996-2001). The 6-year evaluation period includes the lowest river flow during any 3-year period in the river's 78-year flow record to ensure that assessed project impacts are greater than those during an average year. Therefore, this study's evaluation presents conservative estimates of the impacts of the channel deepening. The hydrodynamic model results examine the effects of proposed channel-deepening projects on water level, salinity and water age throughout the model domain and provides tools for analyses of biological, chemical, and ecological impacts. This paper presents the cumulative impacts in the future (50 years after the project completion) from proposed channel-deepening alternatives and other projects, including the Mayport Deepening Project for the U.S. Navy, freshwater withdrawals in the St. Johns River, and future sea level rise. © 2013 American Society of Civil Engineers.

Brownell L.S.,Taylor Engineering Inc. | Adams J.F.,Taylor Engineering Inc.
Ports 2013: Success Through Diversification - Proceedings of the 13th Triennial International Conference | Year: 2013

Increased environmental awareness and accompanying regulation during the 1970s made securing dredged material placement areas increasingly difficult and expensive, especially in Florida's high-growth and increasingly urbanized coastal corridor. To address this situation, in 1986 the Florida Inland Navigation District (FIND) - local sponsor for Florida's Intracoastal Waterway (ICWW) and Okeechobee Waterway (OWW) - embarked on a long-range planning program to ensure the Waterway's continued viability over its 502-channel mile length. The basic program objective is to locate, obtain, design, permit, and construct dredged material management sites capable of handling projected 50-year maintenance dredging requirements. This work has required close coordination with the Jacksonville District U.S. Army Corps of Engineers (USACE), federal and state permitting agencies, local governments, and through numerous public workshops, local citizens' groups. Site acquisitions and construction projects are developed in conjunction with FIND's funding and grant cycles to establish project priorities. When complete, the program will comprise a permanent infrastructure of approximately 52 containment facilities and 8 beach placement sites designed to manage over 41.5 million cubic yards of material over the next 50 years and beyond. © 2013 American Society of Civil Engineers.

Naimaster A.,Taylor Engineering Inc. | Bender C.,Taylor Engineering Inc. | Miller W.,Taylor Engineering Inc.
Advances in Hurricane Engineering: Learning from Our Past - Proceedings of the 2012 ATC and SEI Conference on Advances in Hurricane Engineering | Year: 2013

The Federal Emergency Management Agency (FEMA) commissioned the Georgia/Northeast Florida Storm Surge Study (GANEFLSSS) as part of the recent effort to update coastal Flood Insurance Rate Maps. The study will simulate hurricane-induced coastal flooding with the tightly-coupled SWAN+ADCIRC model. The SWAN+ADCIRC model inputs meteorological, and tidal forcing to calculate depth-averaged currents, water levels, and waves. This paper details model setup and preliminary model validation of the GANEFLSSS. Considerations in model setup included: · Establishing optimal resolution based on data availability, computational resources, potential wave propagation, and proximity to coast. · Identifying and capturing hydraulically important features that could conduct or impede storm surge flow. · Selecting appropriate spatially-variable model parameters, such as Manning's n, wind shielding parameters, and eddy viscosity. The validation effort includes both astronomical tide and five historical storm simulations. The production run storm suite will include several hundred synthetic storms. At writing of this report, validation is currently underway with production runs to follow. Production runs on the 3 million node model mesh will take place on a 528-core high performance computing cluster (HPCC). © ASCE and ATC 2013.

Hydeman M.,Taylor Engineering LLC. | Taylor S.T.,Taylor Engineering LLC. | Eubanks B.,Taylor Engineering LLC.
ASHRAE Journal | Year: 2015

Since the inception of direct digital control (DDC) systems, control system manufacturers and their customers had to choose between two fundamentally different approaches to control system programming:. Copyright 2014 ASHRAE.

Henze G.P.,University of Colorado at Boulder | Florita A.R.,University of Colorado at Boulder | Brandemuehl M.J.,University of Colorado at Boulder | Felsmann C.,TU Dresden | Cheng H.,Taylor Engineering LLC
Journal of Solar Energy Engineering, Transactions of the ASME | Year: 2010

Using a simulation and optimization environment, this paper presents advances toward near-optimal building thermal mass control derived from full factorial analyses of the important parameters influencing the passive thermal storage process for a range of buildings and climate/utility rate structure combinations. Guidelines for the application of, and expected savings from, building thermal mass control strategies that can be easily implemented and result in a significant reduction in building operating costs and peak electrical demand are sought. In response to the actual utility rates imposed in the investigated cities, fundamental insights and control simplifications are derived from those buildings deemed suitable candidates. The near-optimal strategies are derived from the optimal control trajectory, consisting of four variables, and then tested for effectiveness and validated with respect to uncertainty regarding building parameters and climate variations. Due to the overriding impact of the utility rate structure on both savings and control strategy, combined with the overwhelming diversity of utility rates offered to commercial building customers, this study cannot offer universally valid control guidelines. Nevertheless, a significant number of cases, i.e., combinations of buildings, weather, and utility rate structure, have been investigated, which offer both insights and recommendations for simplified control strategies. These guidelines represent a good starting point for experimentation with building thermal mass control for a substantial range of building types, equipments, climates, and utility rates. © 2010 by ASME.

Hydeman M.,Taylor Engineering LLC
Consulting-Specifying Engineer | Year: 2010

Some of the significant issues that need to be considered to improve the accuracy of money sensors are discussed. A money sensor is defined as a sensor where a small error in accuracy can yield large changes in a client's utility bill. Economizers play a key role in establishing the accuracy of such a sensor. The objective of the economizer high-limit switch is to determine when it is beneficial to bring in external air than return air. There are three technologies available for such switches, such as temperature based, enthalpy based, and the H705A solid-state enthalpy controller from Honeywell used in smaller packaged units. These technologies need to be maintained and monitored properly to ensure that they are unable to have adverse impacts on these economizer switches. Another issue that can adversely impact the performance of an air-side economizer is the location of the outdoor sensor for the high-limit switch.

Taylor S.T.,Taylor Engineering LLC | Cheng C.H.,Taylor Engineering LLC
ASHRAE Journal | Year: 2010

The working of an outdoor air economizer, a high limit device, in which supply air temperature is maintained at setpoint, is studied. To test the impact on energy use of the various high limit control options including sensor error, a DOE-2.2 model was created of a typical office building. Sensor error was assumed to be ∓2°F for dry-bulb sensors and ∓4% RH for humidity sensors. Seven high limit controls and combinations were modeled and assumed combined sensor accuracy was listed. The results show that differential dry-bulb control should not be used in humid climates and fixed enthalpy control should not be used in dry climates. Including sensor error, the best option in all climates is simply fixed dry-bulb control, assuming the setpoint is optimized by climate. Fixed enthalpy control when combined with fixed dry-bulb control also performs well and the error in the enthalpy sensor is buffered by the addition of the dry-bulb limit.

Ma Y.,2169 Etcheverry Hall | Kelman A.,University of California at Berkeley | Daly A.,Taylor Engineering LLC | Daly A.,United Environment & Energy, Llc | Borrelli F.,University of California at Berkeley
IEEE Control Systems | Year: 2012

The building sector is the largest energy consumer in the world. Therefore, it is economically, socially, and environmentally significant to reduce the energy consumption of buildings. Achieving substantial energy reduction in buildings may require rethinking the whole processes of design, construction, and operation of a building. This article focuses on the specific issue of advanced control system design for energy efficient buildings. © 1991-2012 IEEE.

Bender C.,Taylor Engineering Inc. | Smith J.M.,Coastal and Hydraulics Laboratory | Kennedy A.,University of Notre Dame | Jensen R.,Coastal and Hydraulics Laboratory
Coastal Engineering | Year: 2013

Hurricane Ike (2008), with its associated storm surge, caused extensive damage across parts of the northwestern Gulf Coast when it made landfall in the late hours of September 12, 2008 along the upper Texas coast at the upper end of Category 2 intensity. An extensive instrumentation effort allowed the collection of both nearshore and inland wave and water level data as Hurricane Ike passed the Louisiana coast and made landfall in Texas. This article presents the results of a validation effort for the STWAVE model and the bottom friction coefficients applied in the model with comparisons to the Hurricane Ike measured wave data. Examination of STWAVE model results as contour plots and time series of wave height and period; wave spectra at selected time steps and scatter plots of simulated versus modeled wave results allow evaluation of the model performance. STWAVE model results indicate good agreement with the measured nearshore wave data for an open water Manning 'n' bottom friction coefficient equal to 0.03s/m0.33. STWAVE model results indicate good agreement with the measured inshore wave data with Manning 'n' bottom friction coefficients equal to values derived from land classification data and applied in the ADCIRC model. © 2012 Elsevier B.V.

Atkinson J.,Arcadis | Smith J.M.,U.S. Army | Bender C.,Taylor Engineering Inc. | Bender C.,University of North Florida
Journal of Waterway, Port, Coastal and Ocean Engineering | Year: 2013

Sea-level rise (SLR) estimates vary broadly, but most estimates predict significant increases in sea levels within the next century. Through the use of validated, coupled wave and hydrodynamic models, this study investigates SLR effects on storm surge and nearshore waves, including variation with coastal landscape type and storm characteristics. Both thewave and hydrodynamic models account for bottom friction based on land-use type, so the modeling procedure accounted for SLR-related changes to land cover, in addition to higher mean sea levels. Simulation of storms with similarmeteorological characteristics and track butwith landfall in the northeastern and southwestern coastal areas allowed examination of how the coastal features influenced the storm surge and wave response to increased sea levels. The simulation results analyzed here demonstrate that the relationship between storm surge and relative SLR (RSLR) varies between geographic region and storm scenario. The increase in an inundated area is linear in the north, and in the south, the inundated area approaches the northern values for similar storms asymptotically.Nearshorewave results indicate, as expected, that largerwater depths created by positive RSLR and amplified surge allow larger waves to propagate into inland areas. For the Texas simulations, itwas found that an increase in hurricanewind speeds of 25% is approximately equivalent to a RSLR of 0.5min terms of increased area of inundation impact. Because of the complexities of storm-surge dependency on storm strength, track, and local topography, there is no one-size-fits-all response to RSLR descriptive of all locations. Site-specific computer modeling should be used to evaluate the risk facing coastal communities. © 2013 American Society of Civil Engineers.

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