Solar-Institut Jülich
Refine
Year of publication
Institute
- Solar-Institut Jülich (340) (remove)
Document Type
- Conference Proceeding (167)
- Article (107)
- Part of a Book (24)
- Report (20)
- Book (17)
- Doctoral Thesis (3)
- Contribution to a Periodical (2)
Keywords
- Energy storage (4)
- Power plants (4)
- Associated liquids (3)
- Concentrated solar power (3)
- Hybrid energy system (3)
- Central receiver power plant (2)
- Central receiver system (2)
- Concentrated solar collector (2)
- Concentrated systems (2)
- Electricity generation (2)
- Gas turbine (2)
- Haustechnik (2)
- Heizung (2)
- Klimatechnik (2)
- Lüftung (2)
- Lüftungstechnik (2)
- Solar concentration (2)
- Solar thermal technologies (2)
- Stickstoffoxide (2)
- building information modelling (2)
- 20 fossil-fueled power plants (1)
- 3D printing (1)
- Abluft (1)
- Acceptance tests (1)
- BIM (1)
- Camera system (1)
- Ceramics (1)
- Cloud passages (1)
- Concentrating solar power (1)
- Control optimization (1)
- DNI forecast (1)
- DNI forecasting (1)
- Decision theory (1)
- Direct normal irradiance forecast (1)
- District data model (1)
- District energy planning platform (1)
- Druckvergasung (1)
- Druckwirbelschichtfeuerung (1)
- Dynamic simulation (1)
- Electrochemistry (1)
- Energiekonzept (1)
- Energy system (1)
- Energy system planning (1)
- Entstaubung (1)
- Feuchtigkeit (1)
- Filter (Stofftrennung) (1)
- Filterkuchen (1)
- Filtration (1)
- Freshmen (1)
- Fresnel collector (1)
- Fresnel power plant (1)
- Gesamtwassergehalt (1)
- Global change (1)
- HVAC (1)
- Heliostat Field Calibration (1)
- Heliostats (1)
- Heterogene Katalyse (1)
- Hybridization (1)
- Kohlefeuerung (1)
- Kohlenmonoxidbelastung (1)
- Kraftwerkstechnik (1)
- Measuring instruments (1)
- Mischen (1)
- Mixed integer linear programming (MILP) (1)
- Modelica (1)
- Molten salt receiver (1)
- Molten salt receiver system (1)
- Molten salt receiver system, (1)
- Molten salt solar tower (1)
- Nasskühlturm (1)
- Nowcasting (1)
- Optical and thermal analysis (1)
- PTC (1)
- Parabolic trough collector (1)
- Performance measurement (1)
- Photovoltaics (1)
- Plant efficiency (1)
- Power conversion systems (1)
- Process prediction (1)
- Prozesssimulation (1)
- Quadrocopter (1)
- Rauchgasreinigung (1)
- Reduktion <Chemie> (1)
- Renewable energy (1)
- Renewable energy integration (1)
- Rohrreaktor (1)
- Schadgas (1)
- Smart Building Engineering (1)
- Solar dish (1)
- Solar irradiance (1)
- Star design (1)
- Staubfilter (1)
- Thermal Energy Storage (1)
- Time-series aggregation (1)
- Transient flux distribution (1)
- Trockenkühlturm (1)
- Two-phase modelling (1)
- Typical periods (1)
- UAV (1)
- Uncertainty analysis (1)
- Unmanned aerial vehicle (1)
- Verdunstungskälte (1)
- Wirbelschichtfeuerung (1)
- borefields (1)
- building energy modelling (1)
- building energy simulation (1)
- ceramics (1)
- concentrating collector (1)
- construction (1)
- digitalization (1)
- dissemination (1)
- emote practical training (1)
- energy (1)
- energy concept (1)
- energy transition (1)
- filtration (1)
- food production (1)
- gas flow (1)
- geothermal (1)
- heat demand (1)
- heat transfer coefficient (1)
- hot gas cleanup (1)
- keramischer Werkstoff (1)
- kombiniertes Verfahren (1)
- lockdown conditions (1)
- open educational resources (1)
- point-focussing system (1)
- prefabrication (1)
- raytracing (1)
- remote teamwork (1)
- renewable energies (1)
- roleplay (1)
- sizing (1)
- small and medium scaled companies (1)
- smart building engineering (1)
- smart engineering (1)
- solar process heat (1)
- sustainability (1)
- urban farming (1)
- virtual reality (1)
In this work the transient simulations of four hybrid solar tower power plant concepts with open-volumetric receiver technology for a location in Barstow-Daggett, USA, are presented. The open-volumetric receiver uses ambient air as heat transfer fluid and the hybridization is realized with a gas turbine. The Rankine cycle is heated by solar-heated air and/or by the gas turbine's flue gases. The plant can be operated in solar-only, hybrid parallel or combined cycle-only mode as well as in any intermediate load levels where the solar portion can vary between 0 to 100%.
The simulated plant is based on the configuration of a solar-hybrid power tower project, which is in planning for a site in Northern Algeria. The meteorological data for Barstow-Daggett was taken from the software meteonorm. The solar power tower simulation tool has been developed in the simulation environment MATLAB/Simulink and is validated.
Using optimization to design a renewable energy system has become a computationally demanding task as the high temporal fluctuations of demand and supply arise within the considered time series. The aggregation of typical operation periods has become a popular method to reduce effort. These operation periods are modelled independently and cannot interact in most cases. Consequently, seasonal storage is not reproducible. This inability can lead to a significant error, especially for energy systems with a high share of fluctuating renewable energy. The previous paper, “Time series aggregation for energy system design: Modeling seasonal storage”, has developed a seasonal storage model to address this issue. Simultaneously, the paper “Optimal design of multi-energy systems with seasonal storage” has developed a different approach. This paper aims to review these models and extend the first model. The extension is a mathematical reformulation to decrease the number of variables and constraints. Furthermore, it aims to reduce the calculation time while achieving the same results.
This study focuses on thermoelectric elements (TEE) as an alternative for room temperature control. TEE are semi-conductor devices that can provide heating and cooling via a heat pump effect without direct noise emissions and no refrigerant use. An efficiency evaluation of the optimal operating mode is carried out for different numbers of TEE, ambient temperatures, and heating loads. The influence of an additional heat recovery unit on system efficiency and an unevenly distributed heating demand are examined. The results show that TEE can provide heat at a coefficient of performance (COP) greater than one especially for small heating demands and high ambient temperatures. The efficiency increases with the number of elements in the system and is subject to economies of scale. The best COP exceeds six at optimal operating conditions. An additional heat recovery unit proves beneficial for low ambient temperatures and systems with few TEE. It makes COPs above one possible at ambient temperatures below 0 ∘C. The effect increases efficiency by maximal 0.81 (from 1.90 to 2.71) at ambient temperature 5 K below room temperature and heating demand Q˙h=100W but is subject to diseconomies of scale. Thermoelectric technology is a valuable option for electricity-based heat supply and can provide cooling and ventilation functions. A careful system design as well as an additional heat recovery unit significantly benefits the performance. This makes TEE superior to direct current heating systems and competitive to heat pumps for small scale applications with focus on avoiding noise and harmful refrigerants.
The Passivhaus building standard is a concept developed for the realization of energy-efficient and economical buildings with a simultaneous high utilization comfort under European climate conditions. Major elements of the Passivhaus concept are a high thermal insulation of the external walls, the use of heat and/or solar shading glazing as well as an airtight building envelope in combination with energy-efficient technical building installations and heating or cooling generators, such as an efficient energy-recovery in the building air-conditioning. The objective of this research project is the inquiry to determine the parameters or constraints under which the Passivhaus concept can be implemented under the arid climate conditions in the Arabian Peninsula to achieve an energy-efficient and economical building with high utilization comfort. In cooperation between the Qatar Green Building Council (QGBC), Barwa Real Estate (BRE) and Kahramaa the first Passivhaus was constructed in Qatar and on the Arabian Peninsula in 2013. The Solar-Institut Jülich of Aachen University of Applied Science supports the Qatar Green Building Council with a dynamic building and equipment simulation of the Passivhaus and the neighbouring reference building. This includes simulation studies with different component configurations for the building envelope and different control strategies for heating or cooling systems as well as the air conditioning of buildings to find an energetic-economical optimum. Part of these analyses is the evaluation of the energy efficiency of the used energy recovery system in the Passivhaus air-conditioning and identification of possible energy-saving effects by the use of a bypass function integrated in the heat exchanger. In this way it is expected that on an annual basis the complete electricity demand of the building can be covered by the roof-integrated PV generator.
In this paper the results of a techno-economic analysis of improved and optimized molten salt solar tower plants (MSSTP plants) are presented. The potential improvements that were analyzed include different receiver designs, different designs of the HTF-system and plant control, increased molten salt temperatures (up to 640°C) and multi-tower systems. Detailed technological and economic models of the solar field, solar receiver and high temperature fluid system (HTF-system) were developed and used to find potential improvements compared to a reference plant based on Solar Two technology and up-to-date cost estimations. The annual yield model calculates the annual outputs and the LCOE of all variants. An improved external tubular receiver and improved HTF-system achieves a significant decrease of LCOE compared to the reference. This is caused by lower receiver cost as well as improvements of the HTF-system and plant operation strategy, significantly reducing the plant own consumption. A novel star receiver shows potential for further cost decrease. The cavity receiver concepts result in higher LCOE due to their high investment cost, despite achieving higher efficiencies. Increased molten salt temperatures seem possible with an adapted, closed loop HTF-system and achieve comparable results to the original improved system (with 565°C) under the given boundary conditions. In this analysis all multi tower systems show lower economic viability compared to single tower systems, caused by high additional cost for piping connections and higher cost of the receivers.
REFERENCES
Technical assessment of Brayton cycle heat pumps for the integration in hybrid PV-CSP power plants
(2022)
The hybridization of Concentrated Solar Power (CSP) and Photovoltaics (PV) systems is a promising approach to reduce costs of solar power plants, while increasing dispatchability and flexibility of power generation. High temperature heat pumps (HT HP) can be utilized to boost the salt temperature in the thermal energy storage (TES) of a Parabolic Trough Collector (PTC) system from 385 °C up to 565 °C. A PV field can supply the power for the HT HP, thus effectively storing the PV power as thermal energy. Besides cost-efficiently storing energy from the PV field, the power block efficiency of the overall system is improved due to the higher steam parameters. This paper presents a technical assessment of Brayton cycle heat pumps to be integrated in hybrid PV-CSP power plants. As a first step, a theoretical analysis was carried out to find the most suitable working fluid. The analysis included the fluids Air, Argon (Ar), Nitrogen (N2) and Carbon dioxide (CO2). N2 has been chosen as the optimal working fluid for the system. After the selection of the ideal working medium, different concepts for the arrangement of a HT HP in a PV-CSP hybrid power plant were developed and simulated in EBSILON®Professional. The concepts were evaluated technically by comparing the number of components required, pressure losses and coefficient of performance (COP).
This chapter introduces performance and acceptance testing and describes state-of-the-art tools, methods, and instruments to assess the plant performance or realize plant acceptance testing. The status of the development of standards for performance assessment is given.