scholarly journals Superconducting Heat Generator for Wind-powered Thermal Energy Systems to Realize High-efficiency, Low-cost Power Generation

2016 ◽  
Vol 51 (5) ◽  
pp. 171-177 ◽  
Author(s):  
Toru OKAZAKI ◽  
Yutaka YAMADA
Keyword(s):  
Power Generation ◽  
Thermal Energy ◽  
High Efficiency ◽  
Low Cost ◽  
Energy Systems ◽  
Heat Generator

scholarly journals Research on the Performance of Solar Aided Power Generation System Based on Annular Fresnel Solar Concentrator

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1579
Author(s):  
Heng Zhang ◽  
Na Wang ◽  
Kai Liang ◽  
Yang Liu ◽  
Haiping Chen
Keyword(s):  
Power Generation ◽  
High Efficiency ◽  
Low Cost ◽  
Economic Index ◽  
Partial Replacement ◽  
Solar Concentrator ◽  
Small Disturbance ◽  
Step Size ◽  
Water Matrix ◽  
Cost Utilization

A solar-aided power generation (SAPG) system effectively promotes the high efficiency and low cost utilization of solar energy. In this paper, the SAPG system is represented by conventional coal-fired units and an annular Fresnel solar concentrator (AFSC) system. The annular Fresnel solar concentrator system is adopted to generate solar steam to replace the extraction steam of the turbine. According to the steam–water matrix equation and improved Flugel formula, the variable conditions simulation and analysis of the thermo-economic index were proposed by Matlab. Furthermore, in order to obtain the range of small disturbance, the method of partial replacement is used, that is, the extraction steam of the turbine is replaced from 0 to 100% with a step size of 20%. In this work, a SAPG system is proposed and its thermo-economic index and small disturbance scope are analyzed. The results show that the SAPG system is energy-saving, and the application scope of small disturbance is related to the quantity of the extraction steam and evaluation index.

Realizing high-efficiency power generation in low-cost PbS-based thermoelectric materials

2020 ◽  
Vol 13 (2) ◽  
pp. 579-591 ◽  
Author(s):  
Binbin Jiang ◽  
Xixi Liu ◽  
Qi Wang ◽  
Juan Cui ◽  
Baohai Jia ◽  
...  
Keyword(s):  
Power Generation ◽  
Conversion Efficiency ◽  
Thermoelectric Materials ◽  
High Efficiency ◽  
Low Cost ◽  
Thermoelectric Module ◽  
High Conversion ◽  
High Conversion Efficiency

A high conversion efficiency of 11.2% was realized in a low-cost PbS-based segmented thermoelectric module.

Research Status and Prospect of Dish-Stirling System

2014 ◽  
Vol 953-954 ◽  
pp. 83-86 ◽  
Author(s):  
Lin Jun Wang ◽  
Li Xiao Xu ◽  
Jing Men ◽  
Dong Zhang ◽  
Zhang Wei Gao ◽  
...  
Keyword(s):  
Power Generation ◽  
Simple Structure ◽  
High Efficiency ◽  
Low Cost ◽  
Thermal Power ◽  
Low Noise ◽  
Green Energy ◽  
Main Research ◽  
Power Generation System ◽  
Solar Thermal Power Generation

Solar energy is a kind of clean and green energy, its use can reduce the dual pressure of resources and environmental pollution. Firstly, this paper introduces groove, tower and dish type solar thermal power generation system. Then it introduces the components of dish-stirling system and the principle and features of stirling engine. The system has simple structure, reliable operation, high efficiency, low noise, low cost of power generation and good commercial prospects. But for some key parts of system, there are many problems that need to be solved. The main research of dish-stirling system is to optimize the key parts of system and reduce the system costs.

scholarly journals Design and Initial Development of Monolithic Cross-Flow Ceramic Hot-Gas Filters

1999 ◽  
Author(s):  
Virginie Vaubert ◽  
David P. Stinton ◽  
Chris Barra ◽  
Santosh Limaye
Keyword(s):  
Power Generation ◽  
High Efficiency ◽  
Low Cost ◽  
National Laboratory ◽  
Cross Flow ◽  
Combined Cycle ◽  
Fluidized Bed Combustion ◽  
Initial Development ◽  
Oak Ridge ◽  
Hot Gas

Advanced, coal-fueled, power generation systems utilizing pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies are currently being developed for high-efficiency, low emissions, and low-cost power generation. In spite of the advantages of these promising technologies, the severe operating environment often leads to material degradation and loss of performance in the barrier filters used for particle entrapment. To address this problem, LoTEC Inc., and Oak Ridge National Laboratory are jointly designing and developing a monolithic cross-flow ceramic hot-gas filter. The filter concept involves a truly monolithic cross-flow design that is resistant to delamination, can be easily fabricated, and offers flexibility of geometry and material make-up. During Phase I of the program, a thermo-mechanical analysis was performed to determine how a cross-flow filter would respond both thermally and mechanically to a series of thermal and mechanical loads. The cross-flow filter mold was designed accordingly, and the materials selection was narrowed down to Ca0.5Sr0.5Zr4P6O24 (CS-50) and 2Al2O3−3SiO2 (mullite). A fabrication process was developed using gelcasting technology and monolithic cross-flow filters were fabricated. The program focuses on obtaining optimum filter permeability and testing the corrosion resistance of the candidate materials.

Experimental Testing of s-CO2 Regenerator for Use as a Replacement to High Cost Printed Circuit Recuperators for Use in s-CO2 Recompression Brayton Cycle

2016 ◽  
Author(s):  
Jacob F. Hinze ◽  
Gregory F. Nellis ◽  
Mark H. Anderson
Keyword(s):  
Thermal Energy ◽  
High Efficiency ◽  
Experimental Testing ◽  
Low Cost ◽  
Scale Model ◽  
Total Power ◽  
Brayton Cycle ◽  
Printed Circuit ◽  
Cold Fluid ◽  
Steel Balls

Supercritical Carbon Dioxide (sCO2) power cycles have the potential to deliver high efficiency at low cost. However, in order for s-CO2 cycle to reach high efficiency, highly effective recuperators are needed. These recuperative heat exchangers must transfer heat at a rate that is substantially larger than the heat transfer to the cycle itself and can therefore represent up to 24% of the total power block cost in a recompression Brayton cycle [1]. Lower cost regenerators are proposed as a cost saving alternative to high cost printed circuit recuperators. A regenerator is a heat exchanger that alternately has hot and cold fluid passing through it. During the first half of its cycle the hot gas is passed over a storage media bed (stainless steel balls, screens, or similar fill material) where thermal energy is stored. During the next half of the cycle, cold fluid is passed through in the opposite direction, extracting the thermal energy from the bed. By operating a cycle with two (or more) regenerators, where one is always in a hot to cold (HTC) blow and the other in a cold to hot blow (CTH), a quasi-steady state can be achieved in the cycle to allow continuous operation. A model of the regenerator was created and used in place of a recuperator in a model of a 10MW power plant. The thermal effectiveness of the regenerator cycle was slightly lower than the recuperator cycle, however the regenerator cycle had a saving of about 9.3 percent in the Levelized Cost of Energy (LCoE). A scale model of the regenerator is under construction which will verify the performance of the regenerator model.

scholarly journals A study on problem diagnosis and maintenance guideline of small scale PV system

2018 ◽  
Vol 7 (2.12) ◽  
pp. 105
Author(s):  
Hee Chul Kim
Keyword(s):  
Power Generation ◽  
Monitoring System ◽  
High Efficiency ◽  
Low Cost ◽  
Monitoring Device ◽  
Cloud Type ◽  
Pv System ◽  
Solar Module ◽  
Iot Platform ◽  
Smoke Sensor

Background/Objectives: Research and development of low-cost, high-efficiency devices that can be installed without replacing existing power generation equipment is promoted early. It is aimed to prevent the damage of property and human life by detecting the fire of PV system. Therefore, it is possible to easily install the device without replacing the solar module The aim is to minimize the damage to people.Methods/Statistical analysis: In order to prepare for the safety accidents of the photovoltaic power generation facilities due to fire and blast, the monitoring system should have the following functions as essential. Measures and analyzes the voltage and current of power generated in each string in the connection board in real time. An alarm is triggered when an abnormality of a specific string is detected or when an abnormal temperature change is detected in the connection panel internal temperature sensor.If the smoke sensor inside the connection panel detects smoke generation and an abnormality such as a fire is caught, the monitoring system immediately generates an alarm.Findings: It provides services such as checking the status of customer power plants, improving power generation efficiency, and recovering quickly in case of a disaster through a monitoring system that supports stable operation of the PV plant and profit generation. By using the existing connection box function as it is, the company minimized the additional cost, and promoted and promoted a low-cost, high-efficiency system.Improvements/Applications: H/W module using temperature and smoke sensor is interlocked with existing connection semi-control system to develop efficient connection monitoring device. In order to link the sensor value with the monitoring system, messages are added and supplemented. For the application of the fail-safe solution, we developed a monitoring device to prevent the escape of the solar module and developed the H / W module using the vibration and loosening sensor. We will develop the solar monitoring system based on cloud type IoT platform by linking the fault recognition and alarm generation function by adding / supplementing the sensor value to link with the monitoring system.As a power station management for cloud type (ASP) service, adoption of oneM2M standard based IoT platform can expand acceptance by monitoring web and mobile based monitoring as well as real time monitoring and fault monitoring of solar power plant.  

scholarly journals The Possibility of a High-efficiency Wave Power Generation System using Dielectric Elastomers

2021 ◽  
Author(s):  
Kazuhiro Ohyama ◽  
Seiki Chiba ◽  
Mikio Waki ◽  
Changqing Jiang ◽  
Makoto Takeshita ◽  
...  
Keyword(s):  
Power Generation ◽  
Environmental Sustainability ◽  
High Efficiency ◽  
Low Cost ◽  
Artificial Muscle ◽  
Current Status ◽  
Oscillating Water Column ◽  
Generation System ◽  
High Efficient ◽  
Power Generation System

Abstract: Power generation using dielectric elastomer (DE) artificial muscle is attracting attention because of its light weight, low cost, and high efficiency. Since this method is a system that produces electricity without emitting carbon dioxide nor using rare earths, it would contribute to the goal of environmental sustainability. In this paper, the background of DEs, the associated high-efficient wave energy generation (WEG) systems that we developed using DEs, as well as the latest development of its material are summarized. By covering the challenges we face and the achievements that we’ve reached, we can discuss the opportunities to build the foundation of a recycled energy society through the usage of these WEGs. On the other hand, to make these possibilities commercially successful, the advantages of DEs need to be integrated with traditional technologies. To achieve this, we also consider the method of using DEs alone and a system used in combination with an oscillating water column. Finally, the current status and future of DEGs are discussed.

Dynamics of Thermal Energy Storage in Integrated Energy Systems With On-Site Power Generation

2002 ◽  
Author(s):  
Ali A. Jalalzadeh-Azar ◽  
Ren Anderson ◽  
Steven J. Slayzak ◽  
Joseph P. Ryan
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Energy Requirement ◽  
Energy Systems ◽  
Electrical Energy ◽  
Energy Availability ◽  
Packed Beds ◽  
Integrated Energy Systems

Integrated energy systems (IES) incorporating on-site power generation provide opportunities for improving reliability in energy supply, maximizing fuel efficiency, and enhancing environmental quality. To fully realize these attributes, optimum design and dynamic performance of integrated systems for a given application have to be pursued. Whether referred to as cogeneration, combined heat and power (CHP) or building cooling, heating, and power (BCHP), integrated energy systems manifest effective energy management aimed at closing spatial and temporal gaps between demand and supply of electrical and thermal energy. This is accomplished by on-site power production and utilization of the resulting thermal energy availability for thermally-driven technologies including desiccant dehumidification, absorption cooling, and space heating. The notion that the demands for thermal and electrical energy are not always congruent and in phase signifies the importance of considering thermal energy storage (TES) for integration. This paper explores the potential impact of implementing TES technology on the overall performance of integrated energy systems from the first- and second-law perspectives. In doing so, the dynamics of packed bed thermal energy storage systems for potential energy recovery from the exhaust gas of microturbines are investigated. Using a validated simulation model, the transient thermal response of these TES systems is examined via parametric analyses that allow variation in the thermal energy availability and physical characteristics of the packed beds. The parasitic electrical energy requirement associated with the pressure losses in the packed beds is included in the performance assessment. The results of this study are indicative of the promising role of TES in integrated energy systems.

Use of Low/Mid-Temperature Solar Heat for Thermochemical Upgrading of Energy, With Application to a Novel Chemically-Recuperated Gas-Turbine Power Generation (SOLRGT) System

2009 ◽  
Author(s):  
Na Zhang ◽  
Noam Lior
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Thermal Energy ◽  
Fossil Fuel ◽  
High Efficiency ◽  
Solar Thermal ◽  
Working Fluid ◽  
Solar Thermal Energy ◽  
Solar Heat ◽  
Overall Efficiency

This paper presents the concept of indirect thermochemical upgrading of low/mid temperature solar heat, and demonstration of its integration into a high efficiency novel hybrid power generation system. The proposed system consists of an intercooled chemically recuperated gas turbine (SOLRGT) cycle, in which the solar thermal energy collected at about 220°C is first transformed into the latent heat of vapor supplied to a reformer and then via the reforming reactions to the produced syngas chemical exergy. The produced syngas is burned to provide high temperature working fluid to a gas turbine. The solar-driven steam production helps to improve both the chemical and thermal recuperation in the system. Using well established technologies including steam reforming and low/mid temperature solar heat collection, the hybrid system exhibits promising performance: the net solar-to-electricity efficiency, based on the gross solar thermal energy incident on the collector, was predicted to be 25–30%, and it can reach up to 35% when the solar share is reduced. In comparison to conventional CRGT system, 30% of fossil fuel saving is feasible with the solar thermal share of 26%, and the system overall efficiency reaches 51.2% to 53.6% when the solar thermal share is increased from 11 to 28.8%. The overall efficiency is about 5.7%-points higher than that of a comparable intercooled CRGT system without solar assist. Due to the introduction of steam into the combustion chamber, production of NOx is near zero, and the reduction of fossil fuel use results in a commensurate 23% reduction of CO2 emissions as compared with the comparable intercooled CRGT system without solar assist.

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