01 April 2017

Performance Analysis of a Steam Turbine Power Plant at Part Load Conditions

Istanbul, Turkey

Journal of Thermal Engineering

International Journal Article Asım Sinan Karakurt, Ümit Güneş

Performance Analysis of a Steam Turbine Power Plant at Part Load Conditions

Asım Sinan Karakurt, Ümit Güneş
International Journal Article
About The Publication

Abstract: Waste heat recovery systems (WHRS), uses exhaust gas in the boiler, are very important in terms of increasing energy efficiency and reducing green gas emissions. Due to this reason, WHRS get more importance. Although dual pressure WHR boiler is more efficient than single pressure boiler, dual pressure boiler needs more heat transfer surface are. When the stage of boiler increases, the size of boiler also increases so it makes dual pressure more expensive. Engine load, exhaust gas temperature and fuel types, effect exhaust gas energy level, are the efficiency parameters for WHRS. In this study two-stroke Diesel engine performance is analyzed in terms of thermal efficiency, engine load, specific fuel oil consumption (SFOC), exergy efficiency and exegetic performance coefficient (EPC). It is shown that which boiler type is suitable due to the working condition in term of technical size and economic parameters.

Keywords: Off design conditions, thermal efficiency, isentropic efficiency, power plant, steam turbine

25 December 2016

Proceeding of V. Turkey Graduate Studies Conference (TLCK) [4 Volume]

Isparta, Turkey

V. Turkey Graduate Studies Conference (TLCK)

Edition Book Ümit Güneş, Eyüp Sami Yavaş
22 December 2016

Exergetic Performance Analysis of Fishing Vessel Refrigeration System

Istanbul, Turkey

2nd International Congress on Energy Systems (ICES-2016)

International Paper Asım Sinan Karakurt, Ümit Güneş

Exergetic Performance Analysis of Fishing Vessel Refrigeration System

Asım Sinan Karakurt, Ümit Güneş
International Paper
08 December 2016

Balıkçı Teknesi Soğutma Sisteminin Ekserji Analizleri

Istanbul, Turkey

1st International Congress on Ship and Maritime Technology (GMO-SHIPMAR)

International Paper Asım Sinan Karakurt, Ümit Güneş

Balıkçı Teknesi Soğutma Sisteminin Ekserji Analizleri

Asım Sinan Karakurt, Ümit Güneş
International Paper
30 June 2016

Performance Analysis of Multipurpose Refrigeration System (MRS) on Fishing Vessel

Gdansk, Poland

Polish Maritime Research, 23(2), 48-56

SCI/SCI-Expanded Journal Article Selected Yasin Üst, Asım Sinan Karakurt, Ümit Güneş

Performance Analysis of Multipurpose Refrigeration System (MRS) on Fishing Vessel

Yasin Üst, Asım Sinan Karakurt, Ümit Güneş
SCI/SCI-Expanded Journal ArticleSelected
About The Publication

Abstract: The use of efficient refrigerator/freezers helps considerably to reduce the amount of the emitted greenhouse gas. A two-circuit refrigerator-freezer cycle (RF) reveals a higher energy saving potential than a conventional cycle with a single loop of serial evaporators, owing to pressure drop in each evaporator during refrigeration operation and low compression ratio. Therefore, several industrial applications and fish storage systems have been utilized by using multipurpose refrigeration cycle. That is why a theoretical performance analysis based on the exergetic performance coefficient, coefficient of performance (COP), exergy efficiency and exergy destruction ratio criteria, has been carried out for a multipurpose refrigeration system by using different refrigerants in serial and parallel operation conditions. The exergetic performance coefficient criterion is defined as the ratio of exergy output to the total exergy destruction rate (or loss rate of availability). According to the results of the study, the refrigerant R32 shows the best performance in terms of exergetic performance coefficient, COP, exergy efficiency, and exergy destruction ratio from among the other refrigerants (R1234yf, R1234ze, R404A, R407C, R410A, R143A and R502). The effects of the condenser, freezerevaporator and refrigerator-evaporator temperatures on the exergetic performance coefficient, COP, exergy efficiency and exergy destruction ratios have been fully analyzed for the refrigerant R32.

Keywords: refrigeration cycles; exergy analysis; exergetic performance coefficient; COP; exergy efficiency;

25 June 2016

Exergetic and Economic Analysis of Subcooling & Superheating Effect on Vapor Compression Refrigeration System

Charlotte, USA

Proceedings of the ASME 2016 Power Conference Power2016.

International Paper Asım Sinan Karakurt, Ümit Güneş, Yasin Üst

Exergetic and Economic Analysis of Subcooling & Superheating Effect on Vapor Compression Refrigeration System

Asım Sinan Karakurt, Ümit Güneş, Yasin Üst
International Paper
About The Publication

Abstract: Refrigeration systems are one of the most common and the oldest thermodynamic system that almost equal to human history. Exergetic and economic effects of subcooling & superheating on vapor compression refrigeration system are analyzed and examined in terms of different refrigerants, working conditions (temperature and pressures), condenser and evaporator effectiveness and temperatures and isentropic efficiency of compressor behalf of coefficient of performance, exergetic efficiency, exergetic performance coefficient and ecological coefficient of performance. The results show that variations of the condenser and evaporator temperatures, pressure losses in heat exchangers and isentropic efficiency of compressor are highly related to performance and economic parameters such as heat exchange areas and power consumption for subcooling & superheating refrigeration system (SSRS).

19 June 2016

Performance Analysis of a Steam Power Plant with District Heating

Portoroz, Slovenia

29th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems (ECOS 2016)

International Paper Turgay Köroğlu, Asım Sinan Karakurt, Ümit Güneş

Performance Analysis of a Steam Power Plant with District Heating

Turgay Köroğlu, Asım Sinan Karakurt, Ümit Güneş
International Paper
About The Publication

Abstract: District heating is a well-known application of sustainable development with respect to both economical and environmental aspects by increasing energy utilization. In this paper, a combined heat and power (cogeneration) system is created by adding a 14000-haused Can-Yenice district heating system after Can steam power plant in the North-west of Turkey. Its performance analysis is carried out to determine the most suitable pressure, temperature and mass flow rate combination of extracted steam with evaluation of different performance criteria as thermal efficiency, utilization factor, power output and heat exchanger area. It has been observed that all housings could be heated with the slight decrease of power output and efficiency that leads less natural gas and coal use for heating in the Can-Yenice district.

Keywords: District heating, steam power plant, performance optimization.

15 October 2015

Exergy and Economic Analysis of Dual Pressure Waste Heat Recovery Boiler

Odisha, India

International Journal of Advances in Mechanical and Civil Engineering, 2(5), 41-43

International Journal Article Selected Ümit Güneş, Asım Sinan Karakurt

Exergy and Economic Analysis of Dual Pressure Waste Heat Recovery Boiler

Ümit Güneş, Asım Sinan Karakurt
International Journal ArticleSelected
About The Publication

Abstract: Waste heat recovery systems (WHRS), uses exhaust gas in the boiler, are very important in terms of increasing energy efficiency and reducing green gas emissions. Due to this reason, WHRS get more importance. Although dual pressure WHR boiler is more efficient than single pressure boiler, dual pressure boiler needs more heat transfer surface are. When the stage of boiler increases, the size of boiler also increases so it makes dual pressure more expensive. Engine load, exhaust gas temperature and fuel types, effect exhaust gas energy level, are the efficiency parameters for WHRS. In this study two-stroke Diesel engine performance is analyzed in terms of thermal efficiency, engine load, specific fuel oil consumption (SFOC), exergy efficiency and exegetic performance coefficient (EPC). It is shown that which boiler type is suitable due to the working condition in term of technical size and economic parameters.

01 September 2015

Proceeding of IV. Turkey Graduate Studies Conference (TLCK) [5 Volume]

Kutahya, Turkey

IV. Turkey Graduate Studies Conference (TLCK)

Edition Book Ümit Güneş, Hümeyra Dinçer
15 May 2015

Performance Analysis of Turbocharged 2-Stroke Diesel Engine

Skopje, Macedonia

Proceedings of 1st International Conference on Engineering and Natural Sciences, 656-664.

International Paper Ümit Güneş, Asım Sinan Karakurt, Yasin Üst

Performance Analysis of Turbocharged 2-Stroke Diesel Engine

Ümit Güneş, Asım Sinan Karakurt, Yasin Üst
International Paper
About The Publication

Abstract: Turbocharger systems are very important for vessels in terms of increasing energy efficiency and reducing green gas emissions. Ambient conditions (winter, ISO and summer) effect intake air temperature so do turbocharger efficiency. Engine load and fuel types that effect exhaust gas energy level are the other parameters for the turbocharger efficiency. In this study, a new numerical method is improved for enthalpy and entropy calculation based on exhaust gas components. Also two-stroke Diesel engine performance which operates various ambient conditions is analyzed in terms of thermal efficiency, engine load, specific fuel oil consumption (SFOC), exergy efficiency and exegetic performance coefficient (EPC). The results show that the highest thermal efficiency is obtained in winter ambient condition and turbocharger efficiency increases when fuel-oil quality is better.

Keywords: Ambient Condition, Two-Stroke Diesel Engine, Energetic Efficiency, Exegetic Performance Coefficient

06 May 2015

Power of Steam

Istanbul, Turkey

Hendese, Journal of Science, Technology And Thought (4)

National Journal Article Ümit Güneş

Power of Steam

Ümit Güneş
National Journal Article
23 October 2014

Exergetic Performance Analyses of Natural Gas Liquefaction Processes

Istanbul, Turkey

Proceedings of 2st International Symposium on Naval Architecture and Maritime (INT-NAM 2014), 235-247.

International Paper Asım Sinan Karakurt, Ümit Güneş, Muhammed Arda, Yasin Üst

Exergetic Performance Analyses of Natural Gas Liquefaction Processes

Asım Sinan Karakurt, Ümit Güneş, Muhammed Arda, Yasin Üst
International Paper
15 November 2014

Proceeding of III. Turkey Graduate Studies Conference (TLCK) [4 Volume]

Sakarya, Turkey

III. Turkey Graduate Studies Conference (TLCK)

Edition Book Ümit Güneş, Nuriye Kayar
15 November 2013

Proceeding of II. Turkey Graduate Studies Conference (TLCK) [5 Volume]

Bursa, Turkey

II. Turkey Graduate Studies Conference (TLCK)

Edition Book Ümit Güneş
12 August 2013

Analysis of Waste Heat Recovery System on Ships in Terms of Technic and Economic

Istanbul, Turkey

Yildiz Technical University, Department of Naval Architecture and Marine Engineering

Master Thesis Ümit Güneş

Analysis of Waste Heat Recovery System on Ships in Terms of Technic and Economic

Ümit Güneş
Master Thesis
About The Publication

Abstract: Considering the energy economy implementations on ships, the first issue to notice is the exhaust gases which comprise nearly 25% of energy loss. Thus, recycling methods out of exhaust gas have more and more importance. Contemplating the expenses of the ships, fuel is of large amount expenditure. When the waste heat recovery from methods exhaust gas are applied, not only fuel save will be ensured but also there will be a decrease in the amount of CO2, NOx and SOx emissions that are released to the environment per unit fuel. In this study, emissions released out of ships to the environment and regulations about the emissions and overloading, Power Turbine Generator (PTG), Steam Turbine Generator (STG) and Combine Waste Heat Recovery (ST+PT) methods that are utilized in the ships, are examined technically and economically. Besides, Organic Rankine Cycle Systems, which are applied to the land-based systems, potential to be implemented to the ships. External conditions and motor load are examined which have impact on the potential while analyzing this exhaust gas potential. Which technical and economical approach is suitable has been investigated for recycling by using low, medium and high power three two-stroke engines.

Keywords: Waste heat recovery system, emissions, power turbine generator, steam turbine generator, organic rankine cycle

15 December 2012

Proceeding of I. Turkey Graduate Studies Conference (TLCK) [1 Volume]

Konya, Turkey

I. Turkey Graduate Studies Conference (TLCK)

Edition Book Furkan Yıldız, Ümit Güneş

Proceeding of I. Turkey Graduate Studies Conference (TLCK) [1 Volume]

Furkan Yıldız, Ümit Güneş
Edition Book
13 December 2012

Organik Rankine Çevrimi Teknolojisi ve Gemilerde Uygulanma Alanı

Istanbul, Turkey

Gemi İnşaatı ve Deniz Teknolojisi Teknik Kongresi 2012 Bildiriler Kitabı, 487-493.

National Paper Ümit Güneş

Organik Rankine Çevrimi Teknolojisi ve Gemilerde Uygulanma Alanı

Ümit Güneş
National Paper
24 October 2011

Cooling System Design for a Fuel Cell Powered Pleasure Boat

Istanbul, Turkey

Proceedings of 1st International Symposium on Naval Architecture and Maritime (INT-NAM 2011), 119-124.

International Paper Yasemin Arıkan, Fahri Çelik, Ümit Güneş

Cooling System Design for a Fuel Cell Powered Pleasure Boat

Yasemin Arıkan, Fahri Çelik, Ümit Güneş
International Paper
About The Publication

Abstract: The decrease of the sources for fossil based fuels and the increase of environmental awareness gives rise to the widespread use of renewable energy sources. Among renewable energies especially fuel cell systems find challenging applications for mobile practice. Because of the low power supply, renewable energy systems offer restricted application areas for ship propulsion. There are applications where renewable energy systems are used as prime energy sources and applications where they are used as secondary energy sources. Marine applications of fuel cells give also rises to the design of convenient auxiliary systems like the fuel cell cooling system. The excess heat produced by the fuel cell must be removed by a cooling system. In this study the cooling system of an 8.5 kW fuel cell is investigated for a pleasure boat which is built in the scope of a student project in the Yıldız Technical University. A water cooling system is designed and analyses are made by the computational fluid dynamics code Fluent.
Keywords: Fuel cell, cooling system, pleasure boat design