A Study of Direct Fuel Injection Two-Stroke Engine for High Specific Power Output and High Engine Speed

1999 ◽  
Author(s):  
Koji Morikawa ◽  
Hideharu Takimoto ◽  
Taiichiroh Ogi
Keyword(s):  
Power Output ◽  
Engine Speed ◽  
Fuel Injection ◽  
Specific Power ◽  
Specific Power Output ◽  
High Specific Power ◽  
High Engine Speed ◽  
Direct Fuel Injection ◽  
Stroke Engine

The Isoengine: A Novel High Efficiency Engine With Optional Compressed Air Energy Storage (CAES)

2003 ◽  
Author(s):  
Claus Linnemann ◽  
Mike W. Coney ◽  
Anthony Price
Keyword(s):  
Energy Storage ◽  
Power Output ◽  
High Efficiency ◽  
Compressed Air ◽  
Specific Power ◽  
Small Scale ◽  
Compressed Air Energy Storage ◽  
Power Cycle ◽  
Specific Power Output ◽  
High Specific Power

A novel high efficiency reciprocating piston engine — the isoengine — is predicted to achieve net electrical efficiencies of up to 60% in units of 5 to 20 MWe size. The high efficiency and at the same time a high specific power output are achieved by integrating isothermal compression, recuperative preheating and isobaric combustion into a novel power cycle. The isoengine can utilize distillate oil, natural gas or suitable biofuels. While the first commercial isoengine is envisaged to have a power output of 7 MW, a 3 MW prototype engine is currently being tested. Since compression and combustion are performed in different cylinders, these processes can also be performed at different times such that the isoengine can be used to create a highly efficient small-scale compressed air energy storage (CAES) system. In such configuration, the engine can operate at more than 140% nominal load for a limited time, which depends on the air storage capacity.

Performance Comparison and Parametric Analysis of sCO2 Power Cycles Configurations

2018 ◽  
Author(s):  
Ali S. Alsagri ◽  
Andrew Chiasson ◽  
Ahmad Aljabr
Keyword(s):  
Power Output ◽  
Thermal Efficiency ◽  
Performance Comparison ◽  
Specific Power ◽  
Brayton Cycle ◽  
Computationally Efficient ◽  
Power Cycles ◽  
Optimization Study ◽  
Specific Power Output ◽  
Improve Calculation

A thermodynamic analysis and optimization of four supercritical CO2 Brayton cycles were conducted in this study in order to improve calculation accuracy; the feasibility of the cycles; and compare the cycles’ design points. In particular, the overall thermal efficiency and the power output are the main targets in the optimization study. With respect to improving the accuracy of the analytical model, a computationally efficient technique using constant conductance (UA) to represent heat exchanger performances is executed. Four Brayton cycles involved in this compression analysis, simple recaptured, recompression, pre-compression, and split expansion. The four cycle configurations were thermodynamically modeled and optimized based on a genetic algorithm (GA) using an Engineering Equation Solver (EES) software. Results show that at any operating condition under 600 °C inlet turbine temperature, the recompression sCO2 Brayton cycle achieves the highest thermal efficiency. Also, the findings show that the simple recuperated cycle has the highest specific power output in spite of its simplicity.

scholarly journals A Double-Bed Adsorptive Heat Transformer for Upgrading Ambient Heat: Design and First Tests

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4037 ◽  
Author(s):  
Mikhail Tokarev
Keyword(s):  
Steady State ◽  
Heat Generation ◽  
Power Output ◽  
Thermal Efficiency ◽  
Natural Source ◽  
Specific Power ◽  
Specific Power Output ◽  
Heat Transformer ◽  
Continuous Heat ◽  
Steady State Cycling

A full scale lab prototype of an adsorptive heat transformer (AHT), consisting of two adsorbers, an evaporator, and a condenser, was designed and tested in subsequent cycles of heat upgrading. The composite LiCl/SiO2 was used as an adsorbent with methanol as an adsorbtive substance under boundary temperatures of TL/TM/TH = −30/20/30 °C. Preliminary experiments demonstrated the feasibility of the tested AHT in continuous heat generation, with specific power output of 520 W/kg over 1–1.5 h steady-state cycling. The formal and experimental thermal efficiency of the tested rig were found to be 0.5 and 0.44, respectively. Although the low potential heat to be upgraded was available for free from a natural source, the electric efficiency of the prototype was found to be as high as 4.4, which demonstrates the promising potential of the “heat from cold” concept. Recommendations for further improvements are also outlined and discussed in this paper.

Some Aspects of the Outline Design Specification of a 0.5 kW Stirling Engine for Domestic Scale Co-Generation

1996 ◽  
Vol 210 (1) ◽  
pp. 25-33 ◽  
Author(s):  
D H Rix
Keyword(s):  
Power Output ◽  
High Volume ◽  
Combined Heat And Power ◽  
Stirling Engine ◽  
Specific Power ◽  
Design Parameters ◽  
Working Fluid ◽  
Design Specification ◽  
Specific Power Output ◽  
Chp System

This paper describes the design considerations that were involved in the production of a prototype Stirling engine, primarily intended for use in a domestic scale combined heat and power (CHP) system. These are discussed in terms of the specification of basic design parameters—configuration, working fluid, etc. First the particular requirements of this application are considered, primarily a power output of 1 kW or less, suitability for high-volume mass production, ultra long life and as high an efficiency as possible. The design that emerges is relatively simple, of low specific power output and with rather conservative operating parameters—temperature, pressure and speed.

Carbon Capture for Automobiles Using Internal Combustion Rankine Cycle Engines

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Robert W. Bilger ◽  
Zhijun Wu
Keyword(s):  
Water Vapor ◽  
Power Output ◽  
Power Plants ◽  
High Efficiency ◽  
Co2 Storage ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Production Costs ◽  
Specific Power ◽  
Specific Power Output

Internal combustion Rankine cycle (ICRC) power plants use oxy-fuel firing with recycled water in place of nitrogen to control combustion temperatures. High efficiency and specific power output can be achieved with this cycle, but importantly, the exhaust products are only CO2 and water vapor: The CO2 can be captured cheaply on condensation of the water vapor. Here we investigate the feasibility of using a reciprocating engine version of the ICRC cycle for automotive applications. The vehicle will carry its own supply of oxygen and store the captured CO2. On refueling with conventional gasoline, the CO2 will be off-loaded and the oxygen supply replenished. Cycle performance is investigated on the basis of fuel-oxygen-water cycle calculations. Estimates are made for the system mass, volume, and cost and compared with other power plants for vehicles. It is found that high thermal efficiencies can be obtained and that huge increases in specific power output are achievable. The overall power-plant system mass and volume will be dominated by the requirements for oxygen and CO2 storage. Even so, the performance of vehicles with ICRC power plants will be superior to those based on fuel cells and they will have much lower production costs. Operating costs arising from supply of oxygen and disposal of the CO2 are expected to be around 20 c/l of gasoline consumed and about $25/tonne of carbon controlled. Over all, ICRC engines are found to be a potentially competitive option for the powering of motor vehicles in the forthcoming carbon-controlled energy market.

Developments in Two-Stroke Cycle Engine Exhaust Emissions

1992 ◽  
Vol 206 (2) ◽  
pp. 93-106 ◽  
Author(s):  
R G Kenny
Keyword(s):  
High Performance ◽  
Fuel Injection ◽  
Low Cost ◽  
Exhaust Emissions ◽  
Spark Ignition Engines ◽  
Engine Exhaust ◽  
Wide Range ◽  
Direct Fuel Injection ◽  
Stroke Engine ◽  
Stroke Cycle

This paper is concerned with the exhaust emissions from two-stroke cycle spark ignition engines and the means being investigated to reduce them. The simple two-stroke engine has inherently low levels of NOx emissions and high levels of hydrocarbon emissions. The reasons for these emissions characteristics are explained by reference to the open literature. The two-stroke engine is used in a wide range of applications including low-cost, low-output mopeds and high-performance motorcycles. More recently there has been a resurgence of interest in the two-stroke as an alternative to the four-stroke engine for automotive use. A number of the recently reported approaches to emissions control are reviewed, including the use of exhaust oxidation catalysts in simple low-cost engines and direct fuel injection on more costly, multi-cylinder engines.

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