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This study investigates experimentally and numerically the laminar flow field and oxy-methane combustion characteristics in a face-to-face two-porous-plates reactor over wide range of operating global equivalence ratio. The reactor is of low power to mimic the operation of high-temperature membrane reactors (HTMRs), but under sufficient oxygen permeation flux for combustion. This is achieved by using...
The stability of a turbulent diffusion flame temperature in an atmospheric gas-turbine combustor is investigated experimentally over a range of operating conditions to study the combined effect of hydrogen-enriched- methane (as fuel) and oxygen with carbon dioxide (oxy-fuel, as the oxidizer) on the combustion flame stability. These conditions included varying fuel and oxidizer mixture compositions,...
In this work, crude glycerol was reformed over modified cerium-zirconium supports loaded with 5 wt% nickel catalyst by a combination of partial oxidation and steam reforming reactions to generate hydrogen via an auto-thermal process. Amongst the tested promoter elements, calcium showed the highest capability of enhancing the activity of the catalyst. Likewise, the composition of crude glycerol mixture...
Integrated energy storage system is essentially proposed to achieve higher exergy recovery through the storage and the recovery of the surplus electrical energy during off-peak and on-peak hours, respectively, while producing other commodities through the charging, storing and discharging processes. The cooling is provided by the use of a solid-gas sorption cycle, which has the ability to provide...
A bi-generation system combining direct absorption flat plate solar collector for medium temperatures air-heating applications integrated with a thermoelectric generator was modeled under optically concentrated solar radiation conditions. In order to improve the performance of the bi-generation system, the proposed system was simulated under the effect of evaporative cooling at the cold side of the...
Solar hydrogen is a promising source for sustainable energy. This work presents an effective sunlight spectral management for hydrogen production from hybrid thermo-photovoltaic (TPV) water electrolysis based on optimal power spectral splitting of the concentrated sunlight. In the proposed power spectral shaping scheme sunlight photons are split at every wavelength below the cutoff wavelength of the...
This paper presents a size optimization method of the energy sources in a standalone photovoltaic system. The proposed technique implies improved photovoltaic array model, dynamic battery model, and accurate objective function as well as a fast simulation algorithm. The loss of load probability (LLP) is used to define the availability of the system. Different system's configurations with different...
The aim of this research is to investigate the pollution haven hypothesis (PHH) in Ghana utilizing CO2 emission as an indicator of air pollution for the period of 1980–2012. Moreover, we utilized gross domestic product (GDP), GDP square, energy consumption, renewable energy consumption, fossil fuel energy consumption, foreign direct investment, institutional quality, urbanization and trade openness...
The optimum size of Micro Gas Turbine Cogeneration Systems (MGT-CGSs) in a Sewage Treatment Plant (STP) in terms of its economic performance was investigated. A STP operating in a cold region was adopted as a model and was scaled down to obtain different size ratios. It was also assumed to operate in different regions to obtain different heat demand patterns. MGT-CGSs with power output capacity of...
The current work investigates experimentally the combined effects of oxy-combustion and partial premixing of the oxidizer (O2 plus CO2) and the fuel (compressed natural gas, CNG) on flame stability considering new burner configuration, namely perforated plate burner. The work explains and quantifies the limits of flammability, visual flame appearance as well as the extinction mechanisms and the visual...
Frequency conversion of the solar spectrum in thermo-photovoltaic systems improves the sunlight conversion efficiency by two means: moving the photovoltaic conversion to a different spectrum with better response, and the ability to recycle the frequency converted photons that exhibit insufficient conversion efficiency. In this work a theoretical optimization of the thermo-photovoltaic system was attempted...
Water splitting photochemical reaction induced by solar energy in the presence of methanol as a hole-scavenger using different structures of ferrites was demonstrated in this study. A few studies in literature have been reported such types of semiconductors, as photocatalytic reagents, for H2 evolution from water-methanol mixture and a minor quantity of H2 productivity yield was demonstrated. In the...
One of the parameters affecting the COP of the absorption system can be considered as the thermal balance between the high pressure condenser (HPC) and the low pressure generator (LPG) since heat rejected from the HPC is utilized as an energy source by the LPG. Condensation of the water vapor in the HPC depends on the heat removal via the LPG. This circumstance is significant for making an appropriate...
In this study, a thermodynamic analysis is conducted on a multigeneration energy system based on renewable energy sources. The proposed system is developed for residential applications, including individual- and multi-building complexes, utilizing solar energy to produce useful outputs, namely electricity, heat, fresh water and hydrogen. Hydrogen is used for the purpose of storing energy to offset...
The main purpose of this study is to derive a methodology for the analysis to determine the best CCHP (Combined Cooling Heat and Power) scheme in the presence of uncertainties differently from deterministic method. The proposed methodology helps decision makers see all the possible risks that impact the amortization of the system. Decisions for investments are generally taken by the conventional method,...
The hydrogen over-producing Escherichia coli HD701, a hydrogenase up-regulated strain, has the potential for industrial-scale hydrogen production; however, this strain is unable to metabolize sucrose which is a major constituent of many waste organic materials that can be used as feedstock for industrial hydrogen production. Invertase from Sacharomyces cervacea (yeast) was partially purified and characterized...
A simple approach has been implemented to identify the optimum RO (Reverse Osmosis) system structure and the operating parameters leading to the minimum total cost. Various two-stage and three-stage arrangements of practical functionality have been optimized. All possible operating points and its corresponding cost have been obtained and a linear search is used to find the minimum cost. The minimum...
In this paper, a new solar-based renewable energy system integrated with PTSCs (parabolic trough solar collectors) is proposed, designed and analyzed for an ice-cream factory located in Isparta, Turkey. The present system includes a PTSC system to meet the heat energy demand for both heating the ice-cream mixture and cooling it down by means of an absorption refrigeration system. Comprehensive energy...
This study investigates the effect of employment of different operation strategies on the economic and environmental performance of a micro gas turbine trigeneration system (MGT-TGS). The MGT-TGS covers power, heating and cooling load of a selected building in a tropical region. The prime movers used were MGTs with electrical output capacity of 30 kW and 65 kW. Four operation strategies; Power-Match,...
This study proposes a new renewable energy based multigeneration system, which integrates a solar PV/T system and a geothermal energy system to produce electricity and heat for power, heating, cooling, hot water and drying air, and investigates the design, analysis and assessment of this integrated system. The psychometric processes are utilized for obtaining required dry agent from the ambient air,...
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