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Passive solar design strategies for buildings are necessary for annual heating energy demand reduction. This paper presents a mathematical model for interior room temperature calculation of a building that integrates a combined passive solar system consisting of an unvented Trombe wall and a direct passive solar system for direct insolation. The model was applied to a residential building located in Niš, Serbia, which is not additionally heated by conventional fuels. Two variations of a combined passive system were taken into consideration. The first combined passive system consisted of a Trombe wall made of 0.45-m-thick concrete and the second combined passive system consisted of a 0.20-m-thick concrete Trombe wall. To calculate the complex mathematical model, depending on the size of the window opening, window slope (slanting or vertical position), and orientation of the room, two software packages were developed, RMSun and InSunTr. In addition, the indoor air temperatures of a thermally insulated residential building with an unvented Trombe wall and a direct passive solar system for different building orientations and different Trombe wall thicknesses were analyzed during the winter period between January and March. [ABSTRACT FROM AUTHOR]

The paper introduces basic information on the geographical location, climate and solar radiation in Serbia. It focuses particularly on the air pollution in Serbia and its influence on the solar cells energy efficiency. Moreover, detailed information on the development of solar energy in Serbia and the examples of the application of the low, medium and high temperature and photovoltaic conversion of solar radiation is provided. The paper also gives an overview of the installed greater capacity solar power stations related to the electricity network and the smaller capacity solar power stations as the independent sources of electricity in Serbia. In conclusion, the paper stresses Serbia's favourite climate and other conditions for the prospective successful development of solar energy. [ABSTRACT FROM AUTHOR]

The study presents the effects of the passive solar heating incorporated in an individual residential building located in Nis, brought about by the application of a passive solar system consisting of a sunspace and a thermo‐accumulative concrete wall thickness of 0.2 and 0.45 m. The building is not additionally heated by conventional fuels. A mathematical model was developed to investigate dynamic behavior of the thermo‐insulated building with attached sunspace and to investigate inner temperatures of the sunspace and of the room divided by thermo‐accumulative concrete partition wall with windows for direct collection of solar radiation. The diagrams are given for interior temperatures of the sunspace and of the room, taking into account the sunspace's various orientations: ψ = 0 ° (south‐orientated sunspace), ψ = +80° (east‐orientated sunspace), ψ = −80 °(west‐orientated sunspace). ψ stands for an angle that determines the position of the wall in relation to sunrays. The results shown in the study were derived using the mathematical model presented in the study. The highest room temperatures are achieved in the case of a thermo‐accumulative concrete wall with a thickness of 0.20 m for a south oriented building with sunspace (ψ = 0 °). This case requires the least additional heating by conventional fuels. The applied mathematical model can be used for the design and materialization of newly built buildings with attached sunspace. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13127, 2019 [ABSTRACT FROM AUTHOR]