International Scientific Journal


Reducing the energy consumption growth rate is increasingly becoming one of the main challenges for ensuring sustainable development, particularly in the buildings as the largest end-use sector in many countries. Along this line, the aim of this paper is to analyse the possibilities for energy savings in the construction of new buildings and reconstruction of the existing ones developing a tool that, in terms of the available heating technologies and insulation, provides answer to the problem of optimal cost effective energy consumption. The tool is composed of an unsteady heat transfer model which is incorporated into a cost-effective energy saving optimization. The unsteady heat transfer model uses annual hourly meteorological data, chosen as typical for the last ten-year period, as well as thermo physical features of the layers of the building walls. The model is tested for the typical conditions in the city of Skopje, Macedonia. The results show that the most cost effective heating technology for the given conditions is the wood fired stove, followed by the inverter air-conditioner. The centralized district heating and the pellet fired stoves are the next options. The least cost effective option is the panel that uses electricity. In this paper, the optimal insulation thickness is presented for each type of heating technology.
PAPER REVISED: 2015-03-12
PAPER ACCEPTED: 2015-03-13
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  1. Enerdata, Energy Efficiency Trends in Buildings in the EU, ODYSSEE MURE project, 2012, URL:
  2. Macedonian Academy of Sciences and Arts, Program for Realization of the Energy Development Strategy in the Republic of Macedonia for the Period 2013 - 2017, Appendices
  3. Kaynakli, O., A study on residential heating energy requirement and optimum insulation thickness, Renewable Energy, 33 (2008), 6, pp. 1164-1172.
  4. Daouas, N., A study on optimum insulation thickness in walls and energy savings in Tunisian buildings based on analytical calculation of cooling and heating transmission loads, Applied Energy, 88 (2011), 1, pp. 156-164.
  5. Ozel, M., Cost analysis for optimum thicknesses and environmental impacts of different insulation materials, Energy Buildings, 49 (2012), pp. 552-559.
  6. Ozel, M., Effect of wall orientation on the optimum insulation thickness by using a dynamic method, Applied Energy, 88 (2011), 7, pp. 2429-2435.
  7. Dongmei, P., et al., The effects of external wall insulation thickness on annual cooling and heating energy uses under different climates, Applied Energy, 97 (2012), pp. 313-318.
  8. Friess, A.W., et al., Wall insulation measures for residential villas in Dubai: A case study in energy efficiency, Energy Buildings, 44 (2012), pp. 26-32.
  9. AL-Sanea, S. A., Zedan, M. F., Improving thermal performance of building walls by optimizing insulation layer distribution and thickness for same thermal mass, Applied Energy, 88 (2012), 9, pp. 3113-3124.
  10. Bond, D. E. M., et al., Configuring wall layers for improved insulation performance, Applied Energy, 112 (2013), pp. 235-245.
  11. Bekkouche, S. M. A., et al., Influence of building orientation on internal temperature in Saharian climates, building located in Ghardaia region (Algeria), Thermal Science, 17 (2013), 2, pp. 349-364.
  12. Andjelkovic, B. B., et al., Thermal mass impact on energy performance of a low, medium, and heavy mass building in Belgrade, Thermal Science, 16 (2012), 2, pp. S447-S459.
  13. Laban, M. Dj., Folic, R. J., Energy efficiency of industrially made buildings influenced by thermal properties of facades, Thermal Science, 18 (2014), 2, pp. 615-630.
  14. Dedinec, A., Kanevce, A., Computational algorithm for estimation of heat energy saving in conventional and new designed flats, 3rd International Conference on Information Society Technology 2013, Full paper in proceedings, Kopaonik, Serbia, 2013.
  15. Prospera,
  16. Collares-Pereira, M, Rabl, A., The average distribution of solar radiation-correlations between diffuse and hemispherical and between daily and hourly insolation values, Solar Energy, 22 (1979), 2,pp. 155-164.
  17. Chwieduk, D., Solar Energy in Buildings, Elsevier, Amsterdam, Nederland, 2014.
  18. Ozel, M., The influence of exterior surface solar absorptivity on thermal characteristics and optimum insulation thickness, Renewable Energy 39 (2012), 1, pp. 347-355.
  19. Agrotehna,
  20. Agrotehna,
  21. Agrotehna,
  22. Agrotehna,
  23. Alpinpelet,
  24. Neptun,,.
  25. Neptun,
  26. Neptun,
  27. Neptun,
  28. Tehnomarket,
  29. Tehnomarket,
  30. Neptun,
  31. Neptun,
  32. Supply of Heat Istok Dooel Skopje, Invoicing methodology,
  33. EVN, Macedonia,
  34. Energy Regulatory Commission of the Republic of Macedonia,
  35. PE "Makedonski sumi", Prices of major forest products of PE "Makedonski sumi", Skopje, No.02-608/5 (in Macedonian language),
  36. Proterm,,.
  37. Energy balance of the Republic of Macedonia for the period 2012-2016, Official Gazette of Republic of Macedonia, Vol. 8, pp. 182, 2011,,d.Yms.
  38. Historical Weather,

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