Numerical Study of Regenerator Configuration in the Design of a Stirling Engine

2014 ◽  
Author(s):  
Ana C. Ferreira ◽  
Senhorinha Teixeira ◽  
Manuel L. Nunes ◽  
Luís B. Martins
Keyword(s):  
Power Systems ◽  
Energy Conversion ◽  
Numerical Study ◽  
Renewable Energy Sources ◽  
Thermodynamic Cycle ◽  
Good Alternative ◽  
Stirling Engine ◽  
Micro Scale ◽  
Point Of Use ◽  
Stirling Engines

The sustainable development involves the rational use of energy, by satisfying energy demands without compromising the safety of future supply. The use of renewable energy sources together with combined heat and power systems is currently considered a priority in Europe. The market trends are evolving to decentralized energy conversion with the increasing replacement of boilers and other conventional systems by small and micro-scale cogeneration units, able to produce the same amounts of useful energies. Micro scale cogeneration systems have been developed as ideal solutions to meet the energy needs for the building sector. These technologies, which include the Stirling engines, allow the production of high quality electricity and heat, efficiently and close to the final point of use. Stirling engines seem to be a good alternative for residential energy conversion. The main objective of this paper is to study alternative configurations for the regenerator of an alpha Stirling engine and evaluate the overall performance of the system. Numerical simulations were performed via a MatLab® code that includes the thermodynamic cycle analysis accounting for the effects of non-ideal heat exchangers and pumping losses. Based on a previously developed costing methodology, the investment purchase cost for each configuration is also estimated. Results showed that, for mean pressure values above 30 bar, the Stirling engine efficiency is higher for a regenerator with a wired mesh matrix rather than with a wrapped foil matrix. This is due both to better heat transfer and to lower pumping losses with the wired mesh configuration. The capital cost of the system was calculated and showed that the heater and the engine bulk are the most expensive components.

scholarly journals Stirling engines - the state of technology development and computational models

2021 ◽  
Author(s):  
Mariusz Furmanek ◽  
Jacek Kropiwnicki
Keyword(s):  
Power Systems ◽  
Computational Models ◽  
Waste Heat ◽  
Numerical Models ◽  
Renewable Energy Sources ◽  
Primary Energy ◽  
Stirling Engine ◽  
Correct Selection ◽  
Engine Operation ◽  
Stirling Engines

Stirling engines represent a technologically important solution in combined heat and power systems. Their use enables the achievement of over 90 percent efficiency in the management of the primary energy source with a very high durability of the device, mainly due to the lack of contact of the working gas with external factors and a very small number of mechanical components. The use of a Stirling engine may be equally important when applying renewable energy sources or waste heat from other processes. The first part of the work presents an overview of available commercial Stirling engine solutions. The second part of the work presents an overview of numerical models of Stirling engine operation, which enable the correct selection of the main geometrical features of the devices and the improvement of the structure in order to maximize efficiency or power.

Stirling Engine Technology for Parabolic Dish-Stirling System Based on Concentrating Solar Power (CSP)

2015 ◽  
Vol 785 ◽  
pp. 576-580 ◽  
Author(s):  
Liaw Geok Pheng ◽  
Rosnani Affandi ◽  
Mohd Ruddin Ab Ghani ◽  
Chin Kim Gan ◽  
Jano Zanariah
Keyword(s):  
High Efficiency ◽  
Combustion Engine ◽  
Renewable Energy Sources ◽  
Stirling Engine ◽  
Energy Sources ◽  
Heat Engines ◽  
Stirling Engines ◽  
Parabolic Dish ◽  
Mechanical Devices ◽  
And Control

Solar energy is one of the more attractive renewable energy sources that can be used as an input energy source for heat engines. In fact, any heat energy sources can be used with the Stirling engine. Stirling engines are mechanical devices working theoretically on the Stirling cycle, or its modifications, in which compressible fluids, such as air, hydrogen, helium, nitrogen or even vapors, are used as working fluids. When comparing with the internal combustion engine, the Stirling engine offers possibility for having high efficiency engine with less exhaust emissions. However, this paper analyzes the basic background of Stirling engine and reviews its existing literature pertaining to dynamic model and control system for parabolic dish-stirling (PD) system.

Simulation of a Solar Stirling Engine Operating Under Various Weather Conditions on Mars

2004 ◽  
Vol 126 (2) ◽  
pp. 812-818 ◽  
Author(s):  
Viorel Badescu
Keyword(s):  
Power Systems ◽  
Meteorological Data ◽  
Weather Conditions ◽  
Heat Losses ◽  
Stirling Engine ◽  
Detailed Model ◽  
Clear Sky ◽  
Stirling Engines ◽  
Pv Cell ◽  
Autumn And Winter

A solar stirling engine based on a horizontal selective flat-plate converter is analyzed in this work. A detailed model for the heat losses towards the atmosphere is presented. The engine’s output power is maximised numerically. The analysis is based on meteorological data measured at Viking Landers sites during clear sky and dust storm conditions. All the computations were performed for a solar collection area similar in size with that of Mars Pathfinder’s Sojourner. The efficiency of converting solar energy into mechanical work at noon is as high as 18%. The power provided by the engine is as high as 16 W during autumn and winter. These results suggest that under the Martian environment the performance of properly designed solar Stirling engines is comparable with that of PV cell power systems.

Modeling a Stirling Engine for Cogeneration Applications

2012 ◽  
Author(s):  
Ana C. Ferreira ◽  
Senhorinha Teixeira ◽  
José C. Teixeira ◽  
Manuel L. Nunes ◽  
Luís B. Martins
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Carbon Dioxide Emissions ◽  
Internal Combustion Engines ◽  
Market Competition ◽  
Good Alternative ◽  
Low Noise ◽  
Total Efficiency ◽  
Partial Load ◽  
Stirling Engines

The interest on decentralized power generation technology has been drastically increasing over the last few years. This great interest is due to the necessity of achieving new ways for improving energy efficiency, the national security of energy supply and the reduction of carbon dioxide emissions. Combined heat and power generation (CHP) systems can be a good option to achieve those goals. In Europe and for the building sector, this fact can be translated in the development of low power systems (micro-CHP), designed to fulfill building equivalent loads. These systems will replace the usual boilers that satisfy the dwelling’s heat requirements and, additionally, generate electricity for own consumption or export back to the electricity grid. The most cited technologies in small and micro-scale are Fuel Cells, Internal Combustion Engines, and Stirling Engines. Stirling Engines are gaining some attention due to their advantages: high total efficiency, fuel flexibility, low emissions, low noise/vibration levels and good performance at partial load. Due to these characteristics, Stirling engines seem to be a good alternative for residential energy conversion, and thus, a pathway for more energy-efficient systems that rise to the challenges of increasing market competition. Many studies have been conducted in order to assess Stirling Engines performance, but the integration of technical and economic evaluation for micro-CHP systems applications is an issue that is not focused in literature, and is the final objective of this project.

Submarine Power Systems Using the V4-275R Stirling Engine

1988 ◽  
Vol 202 (4) ◽  
pp. 257-267 ◽  
Author(s):  
H Nilsson
Keyword(s):  
Power Systems ◽  
Energy System ◽  
Stirling Engine ◽  
Oxygen Storage ◽  
Liquid Oxygen ◽  
Power Module ◽  
Oxygen System ◽  
Stirling Engines ◽  
Engine System ◽  
Total Capacity

The Stirling power module V4-275R, integrated with a liquid oxygen system, is currently built for submarines for the Royal Swedish Navy and for the offshore company Comex in France. Since mid 1985 the Stirling engine system for the Swedish Navy has been successfully tested in a full-scale submarine test section. The next step in this programme will be an integration of the Stirling system into an operational Swedish submarine. A contract has been signed having Kockums as the main contractor. The French programme means a 500 ton manned diver lock-out submarine, the SAGA I, which is under final construction at Comex in Marseille. The energy system for the SAGA submarine consists of two V4–275R Stirling engines of maximum 100 kW power each. The oxygen storage, manufactured by AGA Cryo in Gothenburg, consists of two liquid oxygen tanks providing a total capacity of 10000 kWh, allowing the submarine to perform missions of up to 14 days submerged.

Stirling Engines Powered by Renewable Energy Sources

2016 ◽  
Vol 831 ◽  
pp. 263-269
Author(s):  
Jacek Kropiwnicki ◽  
Aleksandra Szewczyk
Keyword(s):  
Renewable Energy ◽  
Low Temperature ◽  
Electric Power ◽  
Mechanical Energy ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Stirling Engine ◽  
Working Fluid ◽  
Energy Sources ◽  
Stirling Engines

Stirling engine is a device that produces mechanical energy using heat from any source of energy, without the need of combustion of any fuel inside the device. Renewable energy sources, which are mostly low-temperature energy sources, can be used to produce mechanical and electrical energy in Stirling engines. The paper presents an overview of the existing prototype Stirling engines designed for using of low-temperature energy sources, including renewable energy sources. Commercial devices for electric power generation offered for use in home, usually do not exceed 1 kW. Using the Schmidt model, the analyze of influence of temperature working fluid in the expansion space (heater) on the efficiency and the electric power generated in the Stirling engine of alpha type has been presented in the paper.

scholarly journals Voltage Stability of Power Systems with Renewable-Energy Inverter-Based Generators: A Review

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 115
Author(s):  
Nasser Hosseinzadeh ◽  
Asma Aziz ◽  
Apel Mahmud ◽  
Ameen Gargoom ◽  
Mahbub Rabbani
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Voltage Stability ◽  
Reactive Power ◽  
Power Grid ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
System Stability ◽  
Special Issue ◽  
Synchronous Generators

The main purpose of developing microgrids (MGs) is to facilitate the integration of renewable energy sources (RESs) into the power grid. RESs are normally connected to the grid via power electronic inverters. As various types of RESs are increasingly being connected to the electrical power grid, power systems of the near future will have more inverter-based generators (IBGs) instead of synchronous machines. Since IBGs have significant differences in their characteristics compared to synchronous generators (SGs), particularly concerning their inertia and capability to provide reactive power, their impacts on the system dynamics are different compared to SGs. In particular, system stability analysis will require new approaches. As such, research is currently being conducted on the stability of power systems with the inclusion of IBGs. This review article is intended to be a preface to the Special Issue on Voltage Stability of Microgrids in Power Systems. It presents a comprehensive review of the literature on voltage stability of power systems with a relatively high percentage of IBGs in the generation mix of the system. As the research is developing rapidly in this field, it is understood that by the time that this article is published, and further in the future, there will be many more new developments in this area. Certainly, other articles in this special issue will highlight some other important aspects of the voltage stability of microgrids.

scholarly journals Special Issue: “Wind Power Integration into Power Systems: Stability and Control Aspects”

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3680
Author(s):  
Lasantha Meegahapola ◽  
Siqi Bu
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Renewable Energy Sources ◽  
Power Grids ◽  
Energy Sources ◽  
Low Carbon ◽  
Carbon Neutrality ◽  
Stability And Control ◽  
Wind Power Integration ◽  
And Control

Power network operators are rapidly incorporating wind power generation into their power grids to meet the widely accepted carbon neutrality targets and facilitate the transition from conventional fossil-fuel energy sources to the clean and low-carbon renewable energy sources [...]

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