Energy and exergy based evaluation of the renovated Afyon geothermal district heating system

Yazici, Hilmi

doi:10.1016/j.enbuild.2016.06.036

Cited by 28 publications

(9 citation statements)

References 29 publications

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“…Yazici [21] after studying geothermal DH found that lower network temperature overall provides least primary energy consumption due to higher electricity generation of CHP plant and exergy losses occur mainly because of the heat carrier, the heat exchanger losses, the losses of all pumps and pipeline loses as 15.94 %, 12.44 %, 5.52 % and 5.52 % of the total exergy input to the system. However, these are only the internal indicators of a system, which do not show the external effects linked to specific pilot case conditions, for example of marginal electricity mix that can affect environmental and sustainability performance of the studied system.…”

Section: Sustainability and Environmental Impact Assessment Of Dhmentioning

confidence: 99%

Life Cycle Assessment of Different Low-Temperature District Heating Development Scenarios: A Case Study of Municipality in Latvia

Feofilovs

Pakere

Romagnoli

2019

Environmental and Climate Technologies

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Sustainable heating solutions involving renewable energy sources and low supply/return temperatures for district heating are evolving. Low temperature use in district heating allows reducing the heating operation costs significantly and at the same time holding the sustainability criteria. However, an in-depth study on environmental impacts during the life cycle of low temperature district heating was not conducted until now. Thus, this study aims to find the best development scenarios for development of local low temperature district heating. For this purpose, a methodology adopts life cycle analysis approach that allows assessing the environmental impacts according to a variety of environmental performance criterions. The results of the study showed an improvement in the overall environmental performance towards the transition of a conventional 3rd generation district heating to low temperature concept including the effects of reconstruction and modernization of the boiler house. A set of potential development is proposed. Specifically, the scenario implementing low temperature district heating with solar PV showed the best score for environmental performance. The scenario with implementation of low temperature district heating without solar PV did not show significant improvement in environmental performance under operation conditions of a pilot case study.

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Section: Sustainability and Environmental Impact Assessment Of Dhmentioning

confidence: 99%

Life Cycle Assessment of Different Low-Temperature District Heating Development Scenarios: A Case Study of Municipality in Latvia

Feofilovs

Pakere

Romagnoli

2019

Environmental and Climate Technologies

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“…İncelenen alt sistemdeki ekserji yıkımının toplam giren ekserji değerine oranı yakıt tüketim oranını (δ) ifade etmektedir ve Denklem 17 kullanılarak hesaplanır [50]. Ayrıca incelenen alt sistemin üretkenlik eksikliği oranı (ζ), incelenen alt sistemde gerçekleşen ekserji yıkımının tüm sistemden çıkan ekserji miktarına oranıdır ve Denklem 18'deki gibi ifade edilir [51]. Son olarak, Van Gool [52] Belirlenen düğüm noktaları için yapılan sıcaklık, basınç ve debi ölçüm değerleri ve bu değerlerin termodinamik özellikleri Tablo 5'de verilmiştir [45].…”

Section: Gerçek Veri̇leri̇n Elde Edi̇lmesi̇unclassified

Çevre Sıcaklığının Dolaşımlı Akışkan Yataklı Kazanın Ekserji Performansı Üzerindeki Etkisi

Yazici

Köse

2019

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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Sunulan bu çalışmada, Eskişehir'in Seyitgazi ilçesinde yer alan bir endüstriyel tesisteki 75 t/h buhar kapasiteli dolaşımlı akışkan yataklı kazanın konvansiyonel ekserji analizi yapılmıştır. Yapılan analizde; çevre sıcaklığındaki değişimin, kazan ve hava ısıtıcısının ekserji performansına olan etkisi irdelenmiştir. Bunun için standart ölü hal koşulu 25℃, 101,325 kPa ve ölçüm değerlerinin ortalaması olarak 17,27℃, 89,4 kPa'ın yanı sıra 30℃, 28℃, 20℃, 15℃ ve 12℃ için hesaplamalar yapılmıştır. Dolaşımlı akışkan yataklı kazan bölümler halinde incelenmesinden ziyade bir bütün olarak kabul edilmiştir. Hava ısıtıcısı ise kazandan ayrı olarak değerlendirilmiştir. Yapılan hesaplamalar sonucunda kazan ve hava ısıtıcısında gerçekleşen ekserji kayıpları belirlenmiştir. Ayrıca kazan ve hava ısıtıcısının ekserji verimleri hesaplanarak ekserji performansı ortaya çıkarılmıştır. Bu çalışma, dolaşımlı akışkan yataklı kazanın ve hava ısıtıcının ekserji performans kriterlerinin çevre sıcaklığındaki değişimden önemli ölçüde etkilendiğini göstermiştir.

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“…On the other hand, Yazici investigated the exergy performance of the geothermal district heating network in the Afyon province of Turkey, which includes 17 heat exchangers and 13 pumps, renovated from 2011 to 2013 [51]. The study revealed that the exergy destruction was mainly due to the water re-injected in the aquifer and to the losses in the heat exchanger, the pumps, and the pipeline.…”

Section: Exergy Analysis At District or City Scalementioning

confidence: 99%

Exergy Analysis of Energy Systems in Buildings

2018

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The performance of space heating and cooling systems in buildings is usually measured by applying the first law of thermodynamics, which makes it possible to quantify the energy losses of the single components and to measure their energy conversion efficiency. However, this common approach does not properly consider that different forms of energy have different potentials to produce useful work, the latter being a function of the temperature at which energy is made available. As a result, it is not possible to properly address how the “quality” of energy is exploited or conserved in the different processes. On the contrary, the second law of thermodynamics is able to do that by introducing the concept of exergy: This is the maximum amount of work that can be produced through an ideal reversible process evolving until a full condition of equilibrium with the environment is attained. Exergy is; thus, a possible way to measure the “quality” of an energy flow or an energy source. This perspective is particularly relevant when dealing with buildings and their energy conversion systems, which usually deliver thermal energy at a temperature level that is close to the environmental temperature. This means that the users require “low-quality” energy; notwithstanding, this energy comes from the depletion of “high-quality” energy sources, such as fossil fuels and electricity. The exergy analysis helps with identifying such irrational use of the energy sources, which cannot come to light from the energy analysis. In this paper, a literature review identifies methods and metrics commonly used to carry out the exergy analysis of buildings and their energy technologies, while also underlining discrepancies and open methodological issues. Then, the review discusses the main lessons learned from selected works, providing significant advice about the rational use of energy in buildings as well as the most effective technological solutions.

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Energy and exergy based evaluation of the renovated Afyon geothermal district heating system

Cited by 28 publications

References 29 publications

Life Cycle Assessment of Different Low-Temperature District Heating Development Scenarios: A Case Study of Municipality in Latvia

Life Cycle Assessment of Different Low-Temperature District Heating Development Scenarios: A Case Study of Municipality in Latvia

Çevre Sıcaklığının Dolaşımlı Akışkan Yataklı Kazanın Ekserji Performansı Üzerindeki Etkisi

Exergy Analysis of Energy Systems in Buildings

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