Development of CFD simulation model of earth air heat exchanger for space cooling of a 36 M2 house in tropical climate Banda Aceh, Indonesia
Abstract
The global warming makes the ambient temperature hotter and greater efforts are made to reach a comfortable temperature. The continuous use of air conditioners that consume electricity is also unsustainable for the surrounding environment. Several studies on thermal comfort have been conducted by various researchers. Earth-air heat exchangers (EAHE) with air-working fluids can be used as a passive contribution to reduce building energy requirements for heating or cooling purposes. It should be noted that there is very little information in the literature on the development of a CFD (Computational Fluid Dynamic) simulation model of an EAHE for space cooling of a 36 m2 house in a tropical climate, such as Banda Aceh, Indonesia. Therefore, this study aims to examine the performance of EAHE with several variations in design parameters, such as pipe length, pipe diameter, number of pipe bends, and the type of soil where the EAHE is installed, as well as the thermal regime of a 36 m2 house either with or without the use of EAHE. The simulation in this study was conducted with CFD ANSYS Fluent software. The inlet air temperature of EAHE was set to be the same as the ambient air temperature, namely 31.4oC. The simulation results reveal that for variations in pipe length, the highest drop in outlet air temperature was yielded by the 47 m pipe length, which is 26.8°C. In which an increase in pipe length causes a decrease in air outlet temperature. The variation in pipe diameter does not significantly affect the outlet air temperature. Where the average air temperature drop at the EAHE exit is 0.046oC. The variation in number of turns shows that the drop in outlet air temperature is identical, namely 28.2°C, despite the fact that their pressure drop values are different. In addition, it was found that the performance of EAHE buried under different types of soil is distinct. The highest drop in outlet air temperature was generated when the EAHE was buried in silty soil, namely 26.1°C. A case study on a 36 m2 house shows that the utilization an underground heat exchanger can reduce the house’s indoor temperature by 2°C, with an average house temperature of 30.4°C compared to that with a natural ventilation.
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V. Murray and K. L. Ebi, "IPCC special report on managing the risks of extreme events and disasters to advance climate change adaptation (SREX)," vol. 66, ed: BMJ Publishing Group Ltd, 2012, pp. 759-760.
N. Rosa, N. Soares, J. Costa, P. Santos, and H. Gervásio, "Assessment of an earth-air heat exchanger (EAHE) system for residential buildings in warm-summer Mediterranean climate," Sustainable Energy Technologies and Assessments, vol. 38, p. 100649, 2020.
O. E. Indonesia, "Badan Pengkajian Dan Penerapan Teknologi," ed: Indonesia, 2013.
A. Lapertot, M. Cuny, B. Kadoch, and O. Le Métayer, "Optimization of an earth-air heat exchanger combined with a heat recovery ventilation for residential building needs," Energy and Buildings, vol. 235, p. 110702, 2021/03/15/ 2021, doi: https://doi.org/10.1016/j.enbuild.2020.110702.
Y. O. Saragih, "Uji Eksperimental dan Analisa Sebuah Alat Penukar Kalor Udara-Tanah (Earth-Air Heat Exchanger) dengan Siklus Terbuka," 2017.
S. E. Sofyan, E. Hu, A. Kotousov, T. M. Indra Riayatsyah, Khairil, and Hamdani, "A new approach to modelling of seasonal soil temperature fluctuations and their impact on the performance of a shallow borehole heat exchanger," Case Studies in Thermal Engineering, vol. 22, p. 100781, 2020/12/01/ 2020, doi: https://doi.org/10.1016/j.csite.2020.100781.
T. Manik, T. B. Sitorusa, and A. Syahputra, "Performansi Alat Penukar Kalor Udara-Tanah Menggunakan Siklus Tertutup di Kota Medan," Jurnal Sistem Teknik Industri, vol. 22, no. 1, pp. 63-76, 2020.
A. Mermoud, "Cours de physique du sol," Note de cours, Ecole Polytechnique Fédérale de Lausanne, France, 2006.
B. R. Becker, A. Misra, and B. A. Fricke, "Development of correlations for soil thermal conductivity," International Communications in Heat and Mass Transfer, vol. 19, no. 1, pp. 59-68, 1992.
T. Kusuda and J. Bean, "Simplified methods for determining seasonal heat loss from uninsulated slab-on-grade floors," ASHRAE Trans.;(United States), vol. 90, no. CONF-840124-, 1984.
V. Stoichkov, N. Bristow, J. Troughton, F. De Rossi, T. M. Watson, and J. Kettle, "Outdoor performance monitoring of perovskite solar cell mini-modules: Diurnal performance, observance of reversible degradation and variation with climatic performance," Solar Energy, vol. 170, pp. 549-556, 2018/08/01/ 2018, doi: https://doi.org/10.1016/j.solener.2018.05.086.
D. Belatrache, S. Bentouba, and M. Bourouis, "Numerical analysis of earth air heat exchangers at operating conditions in arid climates," International journal of hydrogen energy, vol. 42, no. 13, pp. 8898-8904, 2017.
M. De Paepe and A. Janssens, "Thermo-hydraulic design of earth-air heat exchangers," Energy and buildings, vol. 35, no. 4, pp. 389-397, 2003.
I. M. J. Waisnawa and I. M. B. Pramana, "Pengaruh Pola Ruang Terbuka Hijau Terhadap Sirkulasi Udara Pada Rumah Tinggal," Segara Widya: Jurnal Penelitian Seni, vol. 7, no. 1, pp. 17-30, 2019.
W. P. Jones, Air conditioning engineering. Routledge, 2007.
K. K. Agrawal, M. Bhardwaj, R. Misra, G. Das Agrawal, and V. Bansal, "Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach," Geothermal Energy, vol. 6, no. 1, p. 10, 2018/06/21 2018, doi: 10.1186/s40517-018-0097-0.
DOI: http://dx.doi.org/10.30811/jpl.v21i2.3692
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