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An experimental study of the exergetic performance of an underground air tunnel system for greenhouse cooling

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  • Ozgener, Leyla
  • Ozgener, Onder

Abstract

The present study highlights the exergetic performance characteristics of an underground air tunnel for greenhouse cooling with a 47m horizontal, 56cm nominal diameter U-bend buried galvanized ground heat exchanger. This system was designed and installed in the Solar Energy Institute, Ege University, Izmir, Turkey. Underground air tunnel systems, also known as earth-to-air heat exchangers, are recognized to be outstanding heating, cooling and air heating systems. On the other hand, they have not been used yet in the Turkish market. Greenhouses also have important economical potential in Turkey’s agricultural sector. Greenhouses should be cooled during the summer or hot days. In order to establish optimum growth conditions in greenhouses, renewable energy sources should be utilized as much as possible. It is expected that effective use of underground air tunnels with a suitable technology in the modern greenhouses will play a leading role in Turkey in the foreseeable future. The exergy transports between the components and the destructions in each of the components of the system are determined for the average measured parameters obtained from the experimental results. Exergetic efficiencies of the system components are determined in an attempt to assess their individual performances and the potential for improvements is also presented. The daily maximum cooling coefficient of performances (COP) values for the system are also obtained to be 15.8. The total average COP in the experimental period is found to be 10.09. The system COP was calculated based on the amount of cooling produced by the air tunnel and the amount of power required to move the air through the tunnel, while the exergetic efficiency of the air tunnel is found to be in a range among 57.8–63.2%. The overall exergy efficiency value for the system on a product/fuel basis is found to be 60.7%.

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  • Ozgener, Leyla & Ozgener, Onder, 2010. "An experimental study of the exergetic performance of an underground air tunnel system for greenhouse cooling," Renewable Energy, Elsevier, vol. 35(12), pages 2804-2811.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:12:p:2804-2811
    DOI: 10.1016/j.renene.2010.04.038
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    References listed on IDEAS

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    1. Dincer, Ibrahim, 2002. "The role of exergy in energy policy making," Energy Policy, Elsevier, vol. 30(2), pages 137-149, January.
    2. Ozgener, Onder & Ozgener, Leyla, 2010. "Exergetic assessment of EAHEs for building heating in Turkey: A greenhouse case study," Energy Policy, Elsevier, vol. 38(9), pages 5141-5150, September.
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    1. Yıldız, Ahmet & Ozgener, Onder & Ozgener, Leyla, 2012. "Energetic performance analysis of a solar photovoltaic cell (PV) assisted closed loop earth-to-air heat exchanger for solar greenhouse cooling: An experimental study for low energy architecture in Aeg," Renewable Energy, Elsevier, vol. 44(C), pages 281-287.
    2. Lyu, Weihua & Li, Xianting & Yan, Shuai & Jiang, Sihang, 2020. "Utilizing shallow geothermal energy to develop an energy efficient HVAC system," Renewable Energy, Elsevier, vol. 147(P1), pages 672-682.
    3. Akhtari, Mohammad Reza & Shayegh, Iman & Karimi, Nader, 2020. "Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations," Renewable Energy, Elsevier, vol. 148(C), pages 839-851.
    4. Ozgener, Leyla, 2011. "A review on the experimental and analytical analysis of earth to air heat exchanger (EAHE) systems in Turkey," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(9), pages 4483-4490.
    5. Ozgener, Leyla, 2012. "Coefficient of performance (COP) analysis of geothermal district heating systems (GDHSs): Salihli GDHS case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(2), pages 1330-1334.
    6. Anshu, Kumari & Kumar, Prashant & Pradhan, Basudev, 2023. "Numerical simulation of stand-alone photovoltaic integrated with earth to air heat exchanger for space heating/cooling of a residential building," Renewable Energy, Elsevier, vol. 203(C), pages 763-778.
    7. Bisoniya, Trilok Singh & Kumar, Anil & Baredar, Prashant, 2013. "Experimental and analytical studies of earth–air heat exchanger (EAHE) systems in India: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 238-246.
    8. Singh, Ramkishore & Sawhney, R.L. & Lazarus, I.J. & Kishore, V.V.N., 2018. "Recent advancements in earth air tunnel heat exchanger (EATHE) system for indoor thermal comfort application: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2162-2185.
    9. Hegazy, Anwar & Farid, Mohammed & Subiantoro, Alison & Norris, Stuart, 2022. "Sustainable cooling strategies to minimize water consumption in a greenhouse in a hot arid region," Agricultural Water Management, Elsevier, vol. 274(C).
    10. Sara Bonuso & Simone Panico & Cristina Baglivo & Domenico Mazzeo & Nicoletta Matera & Paolo Maria Congedo & Giuseppe Oliveti, 2020. "Dynamic Analysis of the Natural and Mechanical Ventilation of a Solar Greenhouse by Coupling Controlled Mechanical Ventilation (CMV) with an Earth-to-Air Heat Exchanger (EAHX)," Energies, MDPI, vol. 13(14), pages 1-22, July.
    11. Ozgener, Leyla & Ozgener, Onder, 2010. "Energetic performance test of an underground air tunnel system for greenhouse heating," Energy, Elsevier, vol. 35(10), pages 4079-4085.
    12. Gan, Guohui, 2017. "Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings," Renewable Energy, Elsevier, vol. 103(C), pages 361-371.
    13. Paolo Maria Congedo & Caterina Lorusso & Maria Grazia De Giorgi & Riccardo Marti & Delia D’Agostino, 2016. "Horizontal Air-Ground Heat Exchanger Performance and Humidity Simulation by Computational Fluid Dynamic Analysis," Energies, MDPI, vol. 9(11), pages 1-14, November.
    14. Wael Zeitoun & Jian Lin & Monica Siroux, 2023. "Energetic and Exergetic Analyses of an Experimental Earth–Air Heat Exchanger in the Northeast of France," Energies, MDPI, vol. 16(3), pages 1-15, February.
    15. Thainswemong Choudhury & Anil Misra, 2014. "Minimizing changing climate impact on buildings using easily and economically feasible earth to air heat exchanger technique," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 19(7), pages 947-954, October.
    16. Bansal, Vikas & Misra, Rohit & Agarwal, Ghanshyam Das & Mathur, Jyotirmay, 2013. "Transient effect of soil thermal conductivity and duration of operation on performance of Earth Air Tunnel Heat Exchanger," Applied Energy, Elsevier, vol. 103(C), pages 1-11.
    17. Agrawal, Kamal Kumar & Misra, Rohit & Yadav, Tejpal & Agrawal, Ghanshyam Das & Jamuwa, Doraj Kamal, 2018. "Experimental study to investigate the effect of water impregnation on thermal performance of earth air tunnel heat exchanger for summer cooling in hot and arid climate," Renewable Energy, Elsevier, vol. 120(C), pages 255-265.
    18. Qinggong Liu & Zhenyu Du & Yi Fan, 2018. "Heat and Mass Transfer Behavior Prediction and Thermal Performance Analysis of Earth-to-Air Heat Exchanger by Finite Volume Method," Energies, MDPI, vol. 11(6), pages 1-19, June.
    19. Yue, Yingjun & Yan, Zengfeng & Ni, Pingan & Lei, Fuming & Yao, Shanshan, 2024. "Machine learning-based multi-performance prediction and analysis of Earth-Air Heat Exchanger," Renewable Energy, Elsevier, vol. 227(C).
    20. Alparslan Neseli, Mehmet & Ozgener, Onder & Ozgener, Leyla, 2017. "Thermo-mechanical exergy analysis of Marmara Eregli natural gas pressure reduction station (PRS): An application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 80-88.
    21. Bansal, Vikas & Misra, Rohit & Agarwal, Ghanshyam Das & Mathur, Jyotirmay, 2013. "‘Derating Factor’ new concept for evaluating thermal performance of earth air tunnel heat exchanger: A transient CFD analysis," Applied Energy, Elsevier, vol. 102(C), pages 418-426.
    22. Mihalakakou, Giouli & Souliotis, Manolis & Papadaki, Maria & Halkos, George & Paravantis, John & Makridis, Sofoklis & Papaefthimiou, Spiros, 2022. "Applications of earth-to-air heat exchangers: A holistic review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 155(C).
    23. Ozgener, Onder & Ozgener, Leyla & Goswami, D. Yogi, 2017. "Seven years energetic and exergetic monitoring for vertical and horizontal EAHE assisted agricultural building heating," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 175-179.
    24. Yener, Deniz & Ozgener, Onder & Ozgener, Leyla, 2017. "Prediction of soil temperatures for shallow geothermal applications in Turkey," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 71-77.

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