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KRİTİK-ÜSTÜ KARBON-DİOKSİTİN JEOTERMAL GÜÇ ÇEVRİMİNDE KULLANIMI ÜZERİNE

ON USAGE OF SUPER-CRITICAL CARBON-DIOXIDE IN A GEOTHERMAL POWER CYCLE

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, a power cycle using carbon-dioxide as working fluid was designed. Thermodynamic analysis of a power generation system driven by a geothermal energy source was performed over the cyle. In the operation of cycle, geothermal energy was directly transferred to the working fluid and the applicability of the system proposed was investigated cycling the carbon-dioxide in the super-critical region. The results of the system were compared with those of a similar system present in the literature for verification. In addition to this, the results of the system which was designed assuming that thermosiphon effect would be sufficiently high to be able to cycle the working fluid were compared with the ones that were obtained using pump.
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Abstract (Original Language): 
Bu çalışmada, iş akışkanı olarak karbon-dioksit kullanan bir güç çevrimi tasarlanmıştır. Bu çevrim üzerinden jeotermal enerji kaynaklı bir güç üretim sisteminin termodinamik analizi gerçekleştirilmiştir. Çevrimin işletiminde, jeotermal enerji iş akışkanına doğrudan aktarılmış ve karbon-dioksit, kritik üstü bölgede işletilerek önerilen sistemin uygulanabilirliği araştırılmıştır. Doğruluğunu test etmek için, sistemden elde edilen sonuçlar literatürde mevcut benzer bir sistemin sonuçları ile karşılaştırılmıştır. Buna ilaveten, termosifon etkisinin çevrim içi akışkan döngüsünü sağlayacak mertebede olduğu kabul edilerek tasarlanan sistem ile pompa kullanılarak elde edilen sistem sonuçları karşılaştırılmıştır.
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  • Turkish

REFERENCES

References: 

[1] BROWN, D.W., “A Hot Dry Rock Geothermal Energy Concept Utilizing Supercritical CO2 Instead of Water”, Twenty-Fifth Workshop on Geothermal Reservoir Engineering, Stanford University, SGP-TR-165, 2000.
[2] PRUESS, K., “Enhanced Geothermal Systems (EGS) Using CO2 as Working Fluid – A Novel Approach for Generating Renewable Energy with Simultaneous Sequestration of Carbon”, Geothermics 35, 351-367, 2006.
[3] GURGENCI, H., RUDOLPH, V., SAHA, T., LU, M., “Challenges for Geothermal Energy Utilisation”, Thirty-Third Workshop on Geothermal Reservoir Engineering, Stanford University, SGP-TR-185, 2008.
[4] ZHANG, X.R., YAMAGUCHI, H., UNENO, D., FUJIMA, K., ENOMOTO, M., SAWADA, N., “Analysis of a Novel Solar Energy-powered Rankine Cycle for Combined Power and Heat Generation Using Supercritical Carbon-dioxide”, Renewable Energy, 31, 1839-1854, 2006.
[5] ATRENS, A., GURGENCI, H., RUDOLPH, V., “Exergy Analysis of a CO2 Thermosiphon”, Thirty-Fourth Workshop on Geothermal Reservoir Engineering, Stanford University, SGP-TR-187, 2009.
[6] ATRENS, A.D., GURGENCI, H., RUDOLPH, V., ”CO2 Thermosiphon for Competitive Geothermal Power Generation”, Energy&Fuels 23, 553-557, 2009.
[7] HAALAND, S.E, “Simple and explicit formulas for the friction factor in turbulent pipe flow”, J Fluid Eng ASME 105(1): 89-90, 1983.
[8] WHITE F. M., “Fluid Mechanics”, McGraw-Hill, Boston, MA, USA, 864, 2008.

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