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The analysis of solar gains calculation methodology defined in SRPS en ISO 13790, through the use of software for numerical simulation

ABSTRACT
By regulations on energy efficiency from 2011. the simplified methodology for calculating solar gains has been defined by the adopted values of solar radiation for whole of Serbia. This paper presents two different methods of solar gains calculation, with the support of the software package KnaufTerm 2, which relies on existing regulations in Serbia, and Ecotect software package, intended for 4D simulation. The problem has been analyzed in the case of a residential building in Belgrade, Serbia, by calculating solar gains obtained through one window, for 36 different orientations. Different orientations of the window have shown significant variations in the obtained results, which have been ignored by the rulebook, because it defines only 4 orientations. By this, it was established that four more orientations have to be defined by regulations, with separate values of solar radiation for each position. As the differences in solar gains are most visible in the east, and deviate up to 61%, in the paper then was analysed calculation method of shading for eastern orientation, which is defined by the rulebook on energy efficiency through a variety of shading factors. The analysis has shown that the methodology defined in the regulations has given drastically lower levels of solar gains at the shaded positions, where the most visible differences were observed in the presence of three shading elements. Also, it is necessary to reconsider the values of the defined shading factors, which are, as showed by 4D simulation, oversized.
KEYWORDS
PAPER SUBMITTED: 2017-05-23
PAPER REVISED: 2017-11-05
PAPER ACCEPTED: 2017-12-11
PUBLISHED ONLINE: 2018-04-28
DOI REFERENCE: https://doi.org/10.2298/TSCI170523124B
REFERENCES
  1. ***, Rulebook on Energy Efficiency of Buildings ("Official Gazette of RS", No. 61/11, Belgrade,2011
  2. Rajčić, A. (2011.) : „KnaufTerm2", the software for calculating energy performances of building, purchaser Knauf Insulation, available on www.knaufinsulation.rs
  3. Ecotect Analysis - Sustainable Building Design Software - Autodesk, 2011
  4. U.S. Department of Energy. 2004. Monthly Energy Review. Washington, DC: Energy Information Administration, U S Department of Energy, available on energyplus.net/weather
  5. EN ISO 13790, Energy performance of buildings - Calculation of energy use for heating and cooling, 2008.
  6. Evangelisti, L.,Battista, G., Guattari, C., Basilicata,C.,De Lieto Vollaro,R., Analysis of two models for evaluating energy performance of different buildings, Sustainability 6 (2014) 5311-5321.
  7. Bruno, R., Oliveti, G., Arcuri, N., An analytical model for the evaluation of the correction factor Fw of solar gains through glazed surfaces defined in EN ISO 13790, Energy and Buildings, 96(2015), pp. 1-19
  8. Dutta, A., Samanta, A., Neogi, S., Influence of orientation and the impact of external window shading on building thermal performance in tropical climate, Energy and Buildings, 139(2017), pp. 680-689