Isı-Güç Kombine Sistemlerinde Kullanılan Kalina Çevriminin Enerji ve Ekserji Analizi

Year 2020, Volume: 23 Issue: 1, 181 - 188, 01.03.2020

Yıldız Koç , Hüseyin Yağlı

https://doi.org/10.2339/politeknik.528793

Cited By: 8

Abstract

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.

Keywords

Kalina çevrimi, ısı-güç kombine sistemi, enerji, ekserji, atık ısı geri kazanımı

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

Abstract

Nowadays, when global warming is increasing and air
pollution threatens human health in a sensible way, the need for energy is
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.

Keywords

Kalina cycle, combined heat-power system, energy, exergy, waste heat recovery

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