Hakan Caliskan

Exergy analysis of engines fuelled with biodiesel from high oleic soybeans based on experimental values

This study dealt with energy and exergy analyses of a John Deere 4045T diesel engine run with no. 2 diesel fuel, Soybean oil Methyl Ester (SME) and High-Oleic soybean oil Methyl Ester (HOME) at 1400 1/min. It was aimed at determining energy and exergy efficiencies, energy losses and exergy destructions of the combustion process and comparing exergetically the fuels used. The specific exergy of the fuels was calculated to be efuel,No.2 Diesel > efuel,HOME > efuel,SME, while energy (thermal) and exergy efficiencies were 40.5% and 37.8%, respectively. There were no statistically significant differences between the fuels based on the Tukey method.

A review on exergetic analysis and assessment of various types of engines

This study presents a review on energy and exergy analysis of Otto and Diesel engines. Calculation methods of the analysis are discussed in detail. Previous studies, from 1963 to 2008, are chronologically listed and studied. The test engines had different cylinder numbers, speeds and rated powers. Engine specifications and test bench schematics are given in tables and figures. The best exergetic efficiency is achieved with four-stroke, four-cylinder, turbocharged Diesel engines at about 30% excepting to stationary Diesel engine. It is considered that exergetic efficiency can be higher at lower speeds between 1140 1/min and 2200 1/min.

Exergetic cost analysis and sustainability assessment of an Internal Combustion Engine

This study deals with exergy cost analysis and sustainability assessment of a diesel engine, which runs with diesel no. 2 and two different biodiesel fuels at 1400 1/min test speed. Maximum total cost per exergy flow input rate and total exergy cost are found to be 12.5549

Exergy Analysis and Sustainability Assessment of a Solar-Ground Based Heat Pump With Thermal Energy Storage

/kW•year and 1728.312

Exergetic Analysis and Assessment of Industrial Furnaces

/year for one of the biodiesel fuels, respectively, while minimum values of these costs are determined to be 8.7832

Assessment of Maisotsenko Combustion Turbine Cycle with Compressor Inlet Cooler

/kW•year and 1215.509

Energy, exergy, thermoeconomic and sustainability analyses of a building heating system with a combi-boiler

/year for the diesel no. 2 fuel, respectively. Furthermore, sustainability index (SI) rates and exergetic efficiencies of biodiesel fuels are higher than those of diesel no. 2 fuel.

Environmental Impact Assessment of Various Energy Storage Options for Buildings

In this study, both energy and exergy analyses and sustainability assessment of a thermal energy storage system with a solar-ground coupled heat pump installed in a 120 m 2 house are performed. The actual operating data taken from the literature are utilized for model validation. The system considered here mainly consists of a solar collection system, an underground thermal storage system, an indoor air conditioning system, and a data collection system. First, energy analysis is employed to the system and its components, and the rates of energy input (solar radiation), energy storage, collector heat loss, and other heat loss are found to be 4.083 kW, 1.753 kW, 1.29 kW, and 1.04 kW for a 5 h working time, respectively, while the energy efficiency of the system is calculated to be 42.94%. Exergy analysis of the entire system is then conducted for various reference temperatures varying from 0°C to 25°C with a temperature interval of 5°C. As a result of this analysis, the rates of the maximum exergy input, exergy storage, and exergy losses are determined for a reference temperature of 0°C to be 0.585 kW, 0.24 kW, and 0.345 kW, respectively. Finally the maximum exergy efficiency of the system is obtained to be 40.99% and the maximum sustainable development using sustainability index, which is a function of exergy efficiency, is calculated to be 1.6946 for a reference temperature of 0°C. Furthermore, the energy and exergy results are illustrated through Sankey (energy flow) and Grassmann (exergy loss and flow) diagrams.

Thermodynamic performance assessment of a novel air cooling cycle: Maisotsenko cycle

This study presents exergy analysis of a natural gas-fired radiant tube-heating furnace. In the analysis, actual data over a test period of 3 h were used. Exergy efficiencies, destructions, losses, and entropy generation of the furnace were determined. For an average furnace temperature of 666.6°C, average exergy efficiency value was calculated to be 9.6%. The exergy destruction rate was obtained to be 5.34 kW while exergy rates of the flue gases, exergy losses, and exergy steel were 12.53 kW, 44.28 kW, and 6.6 kW, respectively. On the other hand, the exergy rate of the product (steel) was found to be between 4.61 kW and 9.88 kW over the 15 min test periods, and it reached a maximum rate at the end of the second hour.

Exergoeconomic, enviroeconomic and sustainability analyses of a novel air cooler

In this study, a Maisotsenko combustion turbine cycle (MCTC) with compressor inlet cooling system is proposed and studied through energy, exergy and exergoeconomic analysis methods. The present system consists of a Maisotsenko air cooler, a compressor, a turbine, a generator, a combustor, and a compressed air saturator. The results show that an exergy efficiency of 58.27 % is higher than the corresponding energy efficiency of 51.55 % for the MCTC system, due to the fact that the exergy content of the fuel fed into the combustion chamber is lower than its energy content. Also, the maximum exergy destruction rates occur in the compressor and turbine with the values of 166.964 kW and 150.864 kW, respectively. Furthermore, the exergoeconomic results indicate that the highest exergetic cost factor defined as the destruction in the component per cost is determined to be 0.013148 kW/