The Investigation of Exergetic Performance of Cooling System With Geothermal Steam Ejector

Yıl 2014, Cilt: 2 Sayı: 2, 1 - 13, 18.11.2014

İbrahim Üçgül

Öz

In this study, application fields and potential of geothermal energy of Turkey are introduced. Then, steam ejector cooling systems using geothermal heat source are presented and thermodynamics of the system is explained. Energetic performance of the system (COP) is obtained by the first law of thermodynamics and exergetic performance of the system (COPEX) is obtained by the second law of thermodynamics. In this present study, generator temperatures for ejector cooling system, which will be designed suitably for geothermal fields with low and middle temperatures of Turkey, are selected at interval of two different temperatures (low and middle temperatures). Generator temperatures (Tg) are 60-90C for applications with low temperatures, and 100-130C for applications with middle temperatures. The energetic performance (COP) and the exergetic performance (COPEX) of the system are evaluated for three different conditions of evaporator temperature (Te = 5, 10, 15 C) and two different conditions of condenser temperature (Tc = 30, 35 C). The intervals of temperature for evaluating the system performances are obtained from the experimental steam ejector cooling system designed. The 96 different cases are examined and the results are presented with graphics.

Anahtar Kelimeler

Geothermal energy, Steam ejector cooling, Energetic performance, Exergetic performance

Kaynakça

• Hepbasli, A., “Development of geothermal energy utilization in Turkey: a review”, Renewable Reviews 8, 2004, 433-460. L., and Sustainable Energy
• Ozgener, L., Hepbasli, A., Dincer, I., “Energy and exergy analysis of geothermal district heating systems: an aapication”, Building and Environment 40, 2005, 1309-1322.
• Cerci, Y., “Performance evaluation of a single-flash geothermal power plant in Denizli, Turkey”, Energy 28, 2003, 27- Simsek, S., “Importance of geothermal energy in Turkey”, Int.
• Mediterranean Congress on Solar and Other New-Renewable Energy Resource, Antalya, Turkey,1998. Kaygusuz, K.,
• “Geothermal energy in Turkey: the sustainable future”, Renewable and Sustainable Energy Rewiews 8, 2004, 545-5 Kaygusuz A.,
• Kanoglu, M., “Exergy analysis of a dual-level plant”, Geothermics 31, 2002, 709-724. geothermal power Sozen, A.,
• “Performance improvement of absorption refrigeration system using triple-pressure- level”, Applied Thermal Engineering 23, 2003, 1577-593. Ozalp, M., Li, C.H., Wang, R.Z., Lu, Y.Z.,
• “Investigation of a novel combined cycle of solar powered adsorption-ejection refrigeration system”, Renewable Energy 26, 2001, 611-622.
• Khattab N. M., Barakat M. H., “Modeling The Design and Performance Characteristic of Solar Steam- Jet Cooling for Comfort Air Conditioning”, Solar Energy, Vol.73, No.4, 2002, 257-267.
• A solar ejector cooling system using refrigerant R134 a in the Athens area”, Renewable Energy 30, 2005, 1457-1469. Huang,
• Petrenko, V.A., and Zhuk B., “A solar Chang, J.M., ejector cooling system using refrigerant R141b”, Solar Energy Vol. 64, Nos 4-6, 1998, 223-226.
• Kizilkan, O., “The investigation of applicability of steam-jet cooling system driven with conditioning”, Proceeding of Solar Energy Systems, 20-21 June, 2003, Mersin (in Turkish). air- jeothermal systems”, Journal of Thermal Science and Technology, Vol 12, No 1, 1989, pp. 31- 35 (in Turkish). ejector cooling
• “The investigation of jeothermal steam ejector cooling system irreversibilities”, Proceeding Conditioning, February 2005, Antalya (in Turkish). 67-71, 25-26-27 potential and its utilization in Turkey”,
• World Energy Council, Turc National Comittee, 6. Energy Congress of Turkiye, 17-22 October 1994, İzmir, pp. 69-82 (in Turkish).
• Ş., “Thermodynamic evaluation of Denizli Kızıldere geothermal power plant and its performance Conversion and Management 46, 2004, 245-2 Energy Kanoglu,
• “Economic evaluation of geothermal power generation, heating, and cooling”, Energy, Volume 24, Issue 6, June 1998, 501-50
• “Jeothermal energy and its utilizability in Turkey”, IV. Proceeding of National Clean Energy, 16-18 October 2002, 611- 613, İstanbul (in Turkish).
• “Jeothermal energy potential and its utilizability in Kütahya province”, V. Proceeding of National Clean Energy, Vol. 1, 26-28 May 2004, 409-417,
• İstanbul (in Turkish). “Design and parametric investigation of an ejector in an air-conditioning system”, Applied Thermal Engineering 20, 2003, 213-2
• Alatiqi I., Al-Nuwaibit G., “Evoluating of steam jet ejectors”, Chemical Engineering and Processing, Vol. 41, 2002, 551-561.
• “Ejectors: applications in refrigeration technology”, Renewable and Sustainable Energy Reviews 8, 2004, 129-155. of an ejector with enviromently friendly refrigerants”, Engineering 24, 2004, 827- 838. Thermal performance of an ejector refrigeration cycle operating with various refrigerants”,
• Energy & Management 40, 1999, 873- 8