Building Energy Modeling (BEM) is a complex and diverse process that allows you to achieve better results even with typical design tasks. By using BEM software, it is possible to provide a non-trivial approach to the development of architectural planning and engineering solutions, often combined with each other, to ensure high quality and effective implementation of results. An excellent example of such a process is the use of BEM technology in conjunction with the design of solar heating systems placed on the facades of the building. This approach makes it possible to take into account and practise various subtleties and aspects that are often inaccessible in traditional (without the use of BEM and BIM technologies) design - accurate accounting of heat intake and losses through individual sections of structures, including heterogeneous ones; temperature distribution to individual elements of structures, directly to structures and buildings as a whole, and much more.

The article discusses improvement of a flat solar collector with the heat exchange process intensifying aim, which improves the quality and the equipment efficiency in question. Based on the solar thermal plants’ calculation, taking into account the design features affecting the generated energy amount, a comparative analysis of the characteristics of traditional flat solar collector and solar collector of intensified heat exchange with an independent heating contour was carried out. The theoretical study results of the thermal energy accumulation processes by solar receiving devices of two types are presented.

Renewable energy design is a complex process requiring many different factors to consider. There are many methods for calculating solar heat supply systems, varying in the degree of feasibility of each specific solution relative to its counterparts. Moreover, each design stage is based solely on the determination of the engineering and technical parameters of the selected solar system execution scheme; such important indicators as reliability, load-bearing capacity and operational safety of structural elements on which the elements of solar power plants are located often fade into the background and are even rarely taken into account by agreement with specialists performing related sections (architectural treatment – AT; structural concept – SC). In turn, the latter creates the need to revise the already adopted design options, and sometimes recalculate the developed measures. The solution to this problem is the development of a conceptual design methodology, including the calculation of active solar systems, taking into account not only climatic parameters that affect the performance of solar systems, but also the fundamental influencing factors that form the load on the load-bearing structural elements of the building, as well as entail a change in it. energy model (in particular, thermal protection indicators). At the same time, it is also possible to correlate the architectural and artistic appearance of the building with the accepted layout of the heliofields of active solar systems on the facades and other protruding elements of the building; including inclined facades.