Achieving Net Zero Energy Building in a Hot Climate Using Integrated Photovoltaic and Parabolic trough Collectors

Authors: Adel A. Ghoneim

Abstract:

In most existing buildings in hot climate, cooling loads lead to high primary energy consumption and consequently high CO2 emissions. These can be substantially decreased with integrated renewable energy systems. Kuwait is characterized by its dry hot long summer and short warm winter. Kuwait receives annual total radiation more than 5280 MJ/m2 with approximately 3347 h of sunshine. Solar energy systems consist of PV modules and parabolic trough collectors are considered to satisfy electricity consumption, domestic water heating, and cooling loads of an existing building. This paper presents the results of an extensive program of energy conservation and energy generation using integrated photovoltaic (PV) modules and Parabolic Trough Collectors (PTC). The program conducted on an existing institutional building intending to convert it into a Net-Zero Energy Building (NZEB) or near net Zero Energy Building (nNZEB). The program consists of two phases; the first phase is concerned with energy auditing and energy conservation measures at minimum cost and the second phase considers the installation of photovoltaic modules and parabolic trough collectors. The 2-storey building under consideration is the Applied Sciences Department at the College of Technological Studies, Kuwait. Single effect lithium bromide water absorption chillers are implemented to provide air conditioning load to the building. A numerical model is developed to evaluate the performance of parabolic trough collectors in Kuwait climate. Transient simulation program (TRNSYS) is adapted to simulate the performance of different solar system components. In addition, a numerical model is developed to assess the environmental impacts of building integrated renewable energy systems. Results indicate that efficient energy conservation can play an important role in converting the existing buildings into NZEBs as it saves a significant portion of annual energy consumption of the building. The first phase results in an energy conservation of about 28% of the building consumption. In the second phase, the integrated PV completely covers the lighting and equipment loads of the building. On the other hand, parabolic trough collectors of optimum area of 765 m2 can satisfy a significant portion of the cooling load, i.e about73% of the total building cooling load. The annual avoided CO2 emission is evaluated at the optimum conditions to assess the environmental impacts of renewable energy systems. The total annual avoided CO2 emission is about 680 metric ton/year which confirms the environmental impacts of these systems in Kuwait.

Keywords: Building integrated renewable systems, Net-Zero Energy Building, solar fraction, avoided CO2 emission.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1108903

References:

[1] S. Baden, P. Fairey, P. Waide, J. Laustsen, “Hurdling financial barriers to low energy buildings: experiences from the USA and Europe on financial incentives and monetizing building energy savings in private investment decisions,” In: Proceedings of the 2006 ACEEE Summer Study on Energy Efficiency and Buildings, American Council for an Energy Efficiency Economy, Washington DC, USA, 2006.
[2] H. S. Geller, “Energy Revolution: Policies for a Sustainable Future”, Island Press, Boulder, CO, USA, p. 165. ISBN 1-55963-965-2, 2002.
[3] P. Hernandez, P. Kenny “From net energy to zero energy buildings: Defining life cycle zero energy buildings (LC-ZEB)”, Energy and Buildings, Vol. 42, No.6, pp. 815–821, 2010
[4] K. Voss, A. Goetzberger, G. Bopp, A. Haberle, A. Heinzel, H. Lehmberg, “The self-sufficient solar house in Freiburg—Results of 3 years of operation”, Solar Energy, Vol. 58, pp. 17-23, 1996.
[5] T. H. Reijenga (2000) “Energy efficient and zero-energy building in the Netherlands” In: International Workshop on Energy Efficiency in Buildings in China for the 21st Century, CBEEA, Beijing; December, 2000.
[6] W. Gilijamse, “Zero-energy houses in the Netherlands”. In: Proceedings of Building Simulation ‘95. Madison, Wisconsin, USA, pp. 276-283, August 14–16, 1995.
[7] S. Kadam, “Zero net energy buildings: are they economically feasible?” In: Sustainable Energy Proceedings. Spring (http://web.mit.edu /energylab/www/se/ proceedings/Kadam , 2001.
[8] E. Koutroulis, K. Kalaitzakis, “Design of a maximum power tracking system for wind-energy-conversion applications”, IEEE Transactions on Industrial Electronics, Vol. 53, No. 2, pp. 486–494, 2006.
[9] Y. Hamada, M. Nakamura, K. Ochifuji, S. Yokoyama, K. Nagano, “Development of a database of low energy homes around the world and analyses of their trends ”, Renewable Energy, Vol. 28, No. 2, pp. 321– 328, 1995.
[10] T. Tsoutsos, E. Aloumpi, Z. Gkouskos, M. Karagiorgas,“ Design of a solar absorption cooling system in a Greek hospital”, Energy and Buildings, Vol. 42, No.2, pp. 265-272, 2010.
[11] J.S. Li, “A study of energy performance and efficiency improvement procedures of Government Offices in Hong Kong Special Administrative Region”, Energy and Building, Vol. 40, pp. 1872–1875, 2008.
[12] Iqbal, I. and Al-Homoud M. (2007) ‘Parametric analysis of alternative energy conservation measures in an office building in hot and humid climate’, Energy and Environment, Vol. 42, pp. 2166–2177.
[13] G. Escrivá, C. Álvarez-Bel, I. Valencia-Salazar, “Method for modelling space conditioning aggregated daily load curves: Application to a university building”, Energy and Buildings, Vol. 42, pp. 1275–1282, 2010.
[14] M. M. Rahman, M. G Rasul, M. M. K. Khan, “Energy conservation measures in an institutional building in sub-tropical climate in Australia”, Applied Energy, Vol. 87, pp. 2994–3004, 2010.
[15] M. Oliver, T. Jackson, “Energy and Economic Evaluation of Building Integrated Photovoltaics”, Energy, Vol. 26, pp. 431-439, 2001.
[16] R. Rüther., P. Braun, “Energetic contribution potential of buildingintegrated photovoltaics on airports in warm climates”, Solar Energy, Vol. 83, pp. 1923-1931, 2009.
[17] A. Keoleian, G. Lewis, “Modeling the life cycle energy and environmental performance of amorphous silicon BIPV roofing in the US”, Renewable Energy, Vol. 28, pp. 271-293, 2003.
[18] G. Da Grac, A. Augusto, M. Lerer, “Solar powered net zero energy houses for southern Europe: Feasibility study”, Solar Energy, Vol. 86, pp. 634-646, 2012.
[19] X. Q. Zhai, R. Z. Wang, Y. J. Dai, J. Y. Wu, “Experience on integration of solar thermal technologies with green buildings”, Renewable Energy, Vol. 33, pp 1904–1910, 2008.
[20] H. M. Yin, D. J. Yang, G. Kelly, J. Garant, “Design and performance of a novel building integrated PV / thermal system for energy efficiency of buildings”, Solar Energy, Vol. 87, pp 184-195, 2013.
[21] S. A. Klein, et al., “TRNSYS, A Transient Simulation Program”, Version 16, University of Wisconsin-Madison, 2006.
[22] A. A. Ghoneim, A. Y. Al-Hasan, A. H. Abdullah, “Economic analysis of photovoltaic powered solar domestic hot water systems at Kuwait”, Renewable Energy, Vol. 25, pp. 81-100, 2002.
[23] J. A. Duffie., W. A. Beckman, “Solar Engineering of Thermal Processes”, John Wiley & Sons Inc., New York, 2004.