OF GREENROOFS by ROGER N. HILTEN (Under the Direction of E. W. Tollner) ABSTRACT A study was cond... more OF GREENROOFS by ROGER N. HILTEN (Under the Direction of E. W. Tollner) ABSTRACT A study was conducted to examine the effects induced by a greenroof installation on a typical roof in various climate types of the United States. Initially, heat and moisture transport parameters of a modular greenroof system were evaluated based on physical measurements and simulated soil hydraulics. Using climatic data, the greenroof system was then evaluated to determine the stormwater runoff reduction potential compared to a BUR (Built-Up Roof) and overall energy load effects compared to a BUR and a reflective, “cool” roof in seven U.S. evaluation cities. Runoff simulations were run in HYDRUS-1D, while energy load simulations were run for a hypothetical office building in the evaluation cities using eQuest, a DOEdeveloped building energy load simulation. Simulation results were validated based upon in situ observations at a greenroof installation in Athens, Georgia. Simulated runoff and cooling load...
Microalgae, derived from sunlight, carbon dioxide, water and inorganic salts through photosynthet... more Microalgae, derived from sunlight, carbon dioxide, water and inorganic salts through photosynthetic process can be a future renewable source of biomass to produce liquid biofuels. Algae slurry with 15-20% solid content, produced by Raceway cultivation and centrifugation can be a direct feedstock to produce refinery ready biocrude using thermochemical liquefaction (TCL) and hydrodeoxygenation (HDO) technologies. However, high concentrations of nitrogen and water in the algae biocrude are the key challenges to generate refinery ready biocrude. Two stage TCL process was proposed to limit nitrogen content in the biocrude followed by catalytic HDO technology. The main objective of this study was to investigate a techno-economic assessment (TEA) of algae to refinery feedstock conversion platform for its commercial viability and economic competitiveness with petroleum crude oil. A discounted cash flow model was developed using the commercial process simulation platform to estimate the capi...
OF GREENROOFS by ROGER N. HILTEN (Under the Direction of E. W. Tollner) ABSTRACT A study was cond... more OF GREENROOFS by ROGER N. HILTEN (Under the Direction of E. W. Tollner) ABSTRACT A study was conducted to examine the effects induced by a greenroof installation on a typical roof in various climate types of the United States. Initially, heat and moisture transport parameters of a modular greenroof system were evaluated based on physical measurements and simulated soil hydraulics. Using climatic data, the greenroof system was then evaluated to determine the stormwater runoff reduction potential compared to a BUR (Built-Up Roof) and overall energy load effects compared to a BUR and a reflective, “cool” roof in seven U.S. evaluation cities. Runoff simulations were run in HYDRUS-1D, while energy load simulations were run for a hypothetical office building in the evaluation cities using eQuest, a DOEdeveloped building energy load simulation. Simulation results were validated based upon in situ observations at a greenroof installation in Athens, Georgia. Simulated runoff and cooling load...
Microalgae, derived from sunlight, carbon dioxide, water and inorganic salts through photosynthet... more Microalgae, derived from sunlight, carbon dioxide, water and inorganic salts through photosynthetic process can be a future renewable source of biomass to produce liquid biofuels. Algae slurry with 15-20% solid content, produced by Raceway cultivation and centrifugation can be a direct feedstock to produce refinery ready biocrude using thermochemical liquefaction (TCL) and hydrodeoxygenation (HDO) technologies. However, high concentrations of nitrogen and water in the algae biocrude are the key challenges to generate refinery ready biocrude. Two stage TCL process was proposed to limit nitrogen content in the biocrude followed by catalytic HDO technology. The main objective of this study was to investigate a techno-economic assessment (TEA) of algae to refinery feedstock conversion platform for its commercial viability and economic competitiveness with petroleum crude oil. A discounted cash flow model was developed using the commercial process simulation platform to estimate the capi...
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