Quality Guideline for Energy System Studies: Process Modeling Design Parameters

2012 ◽  
Author(s):  
Mark Woods ◽  
Michael Matuszewski
Keyword(s):  
Process Modeling ◽  
Energy System ◽  
Design Parameters ◽  
Quality Guideline

Quality Guideline for Energy System Studies: CO2 Impurity Design Parameters

2012 ◽  
Author(s):  
Mark Woods ◽  
Michael Matuszewski
Keyword(s):  
Energy System ◽  
Design Parameters ◽  
Quality Guideline

Optimization of Supersonic Axial Turbine Blades Based on Surrogate Models

2020 ◽  
Author(s):  
Markus Waesker ◽  
Bjoern Buelten ◽  
Norman Kienzle ◽  
Christian Doetsch
Keyword(s):  
Reynolds Number ◽  
Turbine Blade ◽  
Surrogate Model ◽  
Cfd Simulation ◽  
Turbine Blades ◽  
Energy System ◽  
Design Parameters ◽  
Blade Design ◽  
Axial Turbine ◽  
Velocity Coefficient

Abstract Due to the transition of the energy system to more decentralized sector-coupled technologies, the demand on small, highly efficient and compact turbines is steadily growing. Therefore, supersonic impulse turbines have been subject of academic research for many years because of their compact and low-cost conditions. However, specific loss models for this type of turbine are still missing. In this paper, a CFD-simulation-based surrogate model for the velocity coefficient, unique incidence as well as outflow deviation of the blade, is introduced. This surrogate model forms the basis for an exemplary efficiency optimization of the “Colclough cascade”. In a first step, an automatic and robust blade design methodology for constant-channel blades based on the supersonic turbine blade design of Stratford and Sansome is shown. The blade flow is fully described by seven geometrical and three aerodynamic design parameters. After that, an automated numerical flow simulation (CFD) workflow for supersonic turbine blades is developed. The validation of the CFD setup with a published supersonic axial turbine blade (Colclough design) shows a high consistency in the shock waves, separation zones and boundary layers as well as velocity coefficients. A design of experiments (DOE) with latin hypercube sampling and 1300 sample points is calculated. This CFD data forms the basis for a highly accurate surrogate model of supersonic turbine blade flow suitable for Mach numbers between 1.1 and 1.6. The throat-based Reynolds number is varied between 1*104 and 4*105. Additionally, an optimization is introduced, based on the surrogate model for the Reynolds number and Mach number of Colclough and no degree of reaction (equal inlet and outlet static pressure). The velocity coefficient is improved by up to 3 %.

Generation of Complex Energy Systems by Combination of Elementary Processes

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
A. Toffolo ◽  
S. Rech ◽  
A. Lazzaretto
Keyword(s):  
Design Optimization ◽  
Ad Hoc ◽  
Energy Systems ◽  
Optimization Procedure ◽  
Thermodynamic Cycle ◽  
Energy System ◽  
Design Parameters ◽  
System Configuration ◽  
Complex Energy ◽  
Synthesis Design

The fundamental challenge in the synthesis/design optimization of energy systems is the definition of system configuration and design parameters. The traditional way to operate is to follow the previous experience, starting from the existing design solutions. A more advanced strategy consists in the preliminary identification of a superstructure that should include all the possible solutions to the synthesis/design optimization problem and in the selection of the system configuration starting from this superstructure through a design parameter optimization. This top–down approach cannot guarantee that all possible configurations could be predicted in advance and that all the configurations derived from the superstructure are feasible. To solve the general problem of the synthesis/design of complex energy systems, a new bottom–up methodology has been recently proposed by the authors, based on the original idea that the fundamental nucleus in the construction of any energy system configuration is the elementary thermodynamic cycle, composed only by the compression, heat transfer with hot and cold sources and expansion processes. So, any configuration can be built by generating, according to a rigorous set of rules, all the combinations of the elementary thermodynamic cycles operated by different working fluids that can be identified within the system, and selecting the best resulting configuration through an optimization procedure. In this paper, the main concepts and features of the methodology are deeply investigated to show, through different applications, how an artificial intelligence can generate system configurations of various complexity using preset logical rules without any “ad hoc” expertise.

scholarly journals Optimum Choice of Energy System Configuration and Storages for a Proper Match between Energy Conversion and Demands

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3957
Author(s):  
Andrea Lazzaretto ◽  
Andrea Toffolo
Keyword(s):  
Energy Conversion ◽  
Energy System ◽  
Distribution Networks ◽  
Design Parameters ◽  
System Configuration ◽  
Or Groups ◽  
Energy Conversion And Storage ◽  
Proper Design ◽  
And Storage ◽  
Distribution Grids

This Special Issue addresses the general problem of a proper match between the demands of energy users and the units for energy conversion and storage, by means of proper design and operation of the overall energy system configuration. The focus is either on systems including single plants or groups of plants, connected or not to one or more energy distribution networks. In both cases, the optimum design and operation involve decisions about thermodynamic processes, about the type, number, design parameters of components/plants, and storage capacities, and about mutual interconnections and the interconnections with the distribution grids. The problem is very wide, can be tackled with different methodologies and may have several, more or less valuable and complicated solutions. The twelve accepted papers certainly represent a good contribution to perceive its difficulty.

scholarly journals Identifying key design parameters of the integrated energy system for a residential Zero Emission Building in Norway

2016 ◽  
Vol 87 ◽  
pp. 1076-1087 ◽  
Author(s):  
Natasa Nord ◽  
Live Holmedal Qvistgaard ◽  
Guangyu Cao
Keyword(s):  
Energy System ◽  
Design Parameters ◽  
Integrated Energy System ◽  
Zero Emission

scholarly journals Sensitivity Study of Design Parameters for a Fuel Cell Powered Multirotor Drone

2021 ◽  
Vol 102 (1) ◽  
Author(s):  
Jørgen Apeland ◽  
Dimitrios G. Pavlou ◽  
Tor Hemmingsen
Keyword(s):  
Fuel Cell ◽  
Experimental Testing ◽  
Energy System ◽  
Sensitivity Study ◽  
Industrial Applications ◽  
Cell System ◽  
Design Parameters ◽  
Reduction Peak ◽  
Central System ◽  
The Impact

AbstractThe use of multirotor drones for industrial applications is accelerating, and fuel cell based propulsion systems are highlighted as a promising approach to improve endurance – one of the current main limitations. Due to multirotor drones’ unique requirements, careful system design is needed to maximize the performance advantage. In this work a sensitivity analysis that quantifies the impact of central system parameters for an X8 multirotor drone with a 2 kW fuel cell hybrid system is presented and discussed. Thrust stand measurements identified a 20–30% efficiency loss from the coaxial configuration, and a ‘single’ configuration can reduce power consumption by 700 W at 25 kg take-off mass. Thus, a smaller fuel cell system can be used, giving an additional 1 kg mass saving and 75–140 W power reduction. Peak endurance is found at a 0.67 energy system weight fraction, and if batteries are improved from 180 Wh/kg to 350 Wh/kg, the energy system mass threshold from where fuel cells are superior rises from 7.4 kg to 8.5 kg. At 700 bar, a 3 L hydrogen cylinder can replace a 6 L at 300 bar, provide a 72-min endurance, and is the preferred option to reach minimum system volume. This work provides guidance in early conceptual stages and insights on how fuel cell based powerplants for multirotors can be improved and optimized to increase their value proposition. Further research can expand the work to cover other system variations and do experimental testing of system performance.

scholarly journals Energy and Exergy Analyses of a Solar-based Multi-generation Energy Plant Integrated with Heat Recovery System and Thermal Energy Storage

2020 ◽  
Author(s):  
Shayan Sadeghi ◽  
Samane Ghandehariun ◽  
Behnaz Rezaie
Keyword(s):  
Energy Storage ◽  
Solar Energy ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
System Performance ◽  
Heat Recovery ◽  
Ternary Eutectic ◽  
Energy System ◽  
Design Parameters ◽  
Energy And Exergy

An innovative multigeneration energy system driven by solar energy is proposed in this paper. The integrated model produces electricity, hydrogen, oxygen, and steam for heating purposes. The energy system comprises a pressurized cavity-based solar power tower, latent thermal energy storage (TES) unit, unfired gas turbine (GT) unit, regenerative steam Rankine cycle (SRC), copper-chlorine (Cu-Cl) thermochemical cycle, and heat recovery units. By utilization of a high-temperature ternary eutectic phase change material (PCM), a dynamic model is developed to deal with the intermittency of solar energy. Using energy and exergy approaches, the proposed system is investigated to assess exergy destruction rates and the overall system performance. A parametric study is performed to investigate the influence of design parameters such as the number of heliostats, the pressure ratio of GT, and temperatures of reactions on the system performance. The results showed that the energy system produces electricity, steam, hydrogen, and oxygen at a rate of 41.9 MW, 12.6 kg/s, 0.19 kg/s, and 0.76 kg/s, respectively. Energy and exergy efficiencies of the integrated system are found to be 49.9%, and 44.9%, respectively.

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