Comparison of toluene and cyclohexane as a working fluid of an organic Rankine cycle used for reheat furnace waste heat recovery

Yağlı, Hüseyin; Koç, Ali; Karakuş, Cuma; Koç, Yıldız

doi:10.1504/ijex.2016.075677

Cited by 40 publications

(15 citation statements)

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“…Kalina çevriminin enerji ve ekserji analizi anlık olarak elde edilen veriler göz önünde bulundurularak yapılacaktır. Hesaplamalarda genel termodinamik denklemlerinden yararlanılmıştır [36][37][38][39][40][41][42][43]. Sürekli akışlı bir sistem için kütle, enerji ve ekserji denklemleri; ∑̇= ∑̇ç (1) ̇+̇= ∑ ç ℎ ç − ∑̇ℎ (2) ̇; =̇; ç + ̇; [46].…”

Section: Matemati̇ksel Metotunclassified

Energy and Exergy Analysis of a Kalina Cycle Used for Combined Heat-Power Systems

Koç

Yağlı

2020

Politeknik Dergisi

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Koç Y. ve Yağlı H., "Isı-güç kombine sistemlerinde kullanılan kalina çevriminin enerji ve ekserji analizi", Politeknik Dergisi, 23(1): 181-188, (2020).Erişim linki (To link to this article): http://dergipark.org.tr/politeknik/archive ÖZ Küresel ısınmanın giderek arttığı ve hava kirliliğinin insan sağlığını hissedilebilir şekilde tehdit ettiği bugünlerde, enerjiye olan ihtiyaç da giderek artmaktadır. Bu nedenle sadece insanların enerji ihtiyacını karşılamak değil bunun yanında çevreyi tehdit eden unsurların da minimum seviyelere indirilmesi hedeflenmektedir. Enerji ihtiyacını karşılamak için araştırmacılar farklı enerji üretim sistemleri üzerinde çalışmalar yapmakta ya da var olan tesislerin kapasitesini arttırmaktadır. Ancak, küresel ısınma ve hava kirliliğinin en önemli sebeplerinden biri olan endüstriyel atık ısı ve baca gazları atmosfere bırakılarak büyük bir enerji israfına sebep olmaktadır. Bu nedenle, kullanılmakta olan tesislerin iyileştirilmesi ve atık ısıların geri kazanımı hayati derecede önem arz etmektedir. Bu çalışmada kombine ısı-güç çevrimindeki orta derece sıcaklıktaki atık ısının geri dönüşümünü sağlamak için yeni bir metot olan Kalina çevrimi tasarlanmıştır. Sonrasında tasarlanmış olan Kalina çevriminin birinci ve ikinci kanun yönünden termodinamik analizi yapılmıştır. Çalışma sonucunda, maksimum ekserji yıkımı buharlaştırıcıda görülürken, Kalina çevriminin enerji verimi ve ekserji verimi sırasıyla yaklaşık %12 ve %27 olarak hesaplanmıştır.Anahtar Kelimeler: Kalina çevrimi, ısı-güç kombine sistemi, enerji, ekserji, atık ısı geri kazanımı. ABSTRACTNowadays, when global warming is increasing and air pollution threatens human health in a sensible way, the need for energy i s increasing. Therefore, it is aimed not only to meet the people's energy needs but also to minimize the factors that threaten the environment. To meet the energy needs, researchers are working on different power generation systems or trying to increase the capacity of existing plants. However, industrial waste heat and flue gases, one of the most important reasons of global warming and air pollution, are released to the atmosphere and cause a great waste of energy. Therefore, the improvement of the facilities in use and the recovery of waste heat are of vital importance. In this study, the Kalina cycle, which is a new method for recovering the waste heat has been designed for a medium temperature waste heat source released from a combined heat-power system. Afterwards, the thermodynamic analysis of the designed Kalina cycle was carried out in terms of the first and second law of the thermodynamics. As a result of the study, maximum exergy destruction was observed in evaporator, while energy efficiency and exergy efficiency of Kalina cycle were calculated as 12% and 27%, respectively.

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Section: Matemati̇ksel Metotunclassified

Energy and Exergy Analysis of a Kalina Cycle Used for Combined Heat-Power Systems

Koç

Yağlı

2020

Politeknik Dergisi

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“…studies, another important area of focus is on improving the efficiency of current power systems by integrating additional systems [8,9]. Kalina cycles, heat wheels, recuperators, and economizers represent just some of these additional systems [10][11][12]. In addition to these, another most important approach is organic Rankine cycles (ORC).…”

Section: Introductionmentioning

confidence: 99%

Deep neural network approach to estimation of power production for an organic Rankine cycle system

Mert

Bilgiç

Yağlı

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…Yagli et al compared toluene and cyclohexane as working fluids for an ORC designed for the high temperature exhaust gas of a reheat furnace. Results showed that the ORC using cyclohexane gave better results than the ORC that used toluene for the same working conditions [35]. Lai et al analysed the performance of subcritical and supercritical ORCs for different working fluids.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration

2019

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In the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the working fluid for both the subcritical and supercritical rORC. During the parametric optimisation, the net power production, mass flow rate, exchanged heat in the regenerator, total pump power consumption, thermal and exergetic efficiencies of rORC were calculated for varying turbine inlet temperatures and pressures. After parametric optimisation of the rORC, the results were compared with the results of the previous study, in which only a simple ORC is analysed and parametrically optimised. Moreover, the effect of the regenerator was revealed by examining all results together. Finally, the exergetic analysis of the best performing subcritical and supercritical rORC was performed. Furthermore, the results of the present and previous studies were considered together and it is clearly seen that the subcritical rORC shows the best performance. Consequently, by using the subcritical rORC, the disadvantages of the using simple ORC (low performance) and supercritical cycle (safety, investment) can be eliminated and system performance can be improved.

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Comparison of toluene and cyclohexane as a working fluid of an organic Rankine cycle used for reheat furnace waste heat recovery

Cited by 40 publications

References 0 publications

Energy and Exergy Analysis of a Kalina Cycle Used for Combined Heat-Power Systems

Energy and Exergy Analysis of a Kalina Cycle Used for Combined Heat-Power Systems

Deep neural network approach to estimation of power production for an organic Rankine cycle system

Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration

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