## 1 Introduction  
At the beginning of the 21 st century, the conception of the information modelling of buildings (BIM) was developed by the U.S. company Autodesk for industrial building applications. BIM in building engineering can now be seen as a favoured and well-known approach, as a method of interpreting large datasets, used in all life cycle stages of buildings--from their preparation, design, and construction to building management. The main contribution of BIM is in integrating all data related to a building into one unified digital model, which facilitates communication between the particular participants of the building life cycle and suppresses the risk of error. BIM makes related processes more effective and reduces costs, with the possibility of the simulation and prediction of the behaviour of a building under real operation. Its functions overlap these domains, offering wide possibilities of applications, such as building sustainability planning and their complete life cycle analyses [1, 2, 3]. In the early phase of investment project preparation, designers and architects must frequently perform detailed simulations to predict the ecological demands of such projects. The design process requires highly effective compatibility between CAD systems, special simulation software, and energy evaluation tools to support the easy transfer of data models and the results of the analyses. This technical synergy provides consistent and exact outputs for the complex evaluation of the environmental demands of objects and the further optimisation of their design parameters. The design approach based on BIM in the building industry relies on digital 3D models, utilised throughout the entire life cycle of the project. Numerous studies have highlighted the ability of such approaches to improve the effectiveness of building projects. BIM supports digital creation, exchange, and the transfer of all project information. Specifically, 6D BIM [4] connects internal and external energetic parameters. Architects often use 6D BIM to evaluate selected energy parameters to optimise the building energy design. However, in research directed toward 6D BIM coupled with building energy management (BEM), questions remain, namely (i) the energy simulation process in the BIM environment typically suffers from data loss during transfer, and (ii) the simulation tools are rather complicated and require users to have advanced programming knowledge and further specialised skills. Especially for high public investment projects/contracts, the proper utilisation of 6D BIM seems necessary in the early design phase. The exploitation of BIM during the lifecycles of buildings is an inevitable trend in the building industry in the last few years. Numerous potential research areas have been stimulated by BIM, particularly the integration of BEM to establish energy simulations in large projects [5]. Several software packages have been developed over the last few decades to support the analysis of energy consumption in buildings, such as DOE-2, EnergyPlus, ESP-r, HASP, and DeST [6]. Of all these software tools, EnergyPlus, with its algorithms for dynamical simulations, modular architecture, and excellent scalability, can be seen as the standard for energetic simulations, the integration of thermal technical computations, as well as advanced algorithms for climate control in buildings, providing a key basis for the design of effective and environmentally optimal buildings [7; 8]. Consequently, the design of such buildings needs to improve data exchange between BIM systems and BEM models. The strong motivation for this is the fact that the European building industry consumes approximately 40% of total energy production, and one of the most important factors influencing this consumption is the quality of the thermal envelopes of buildings [9; 10]. The European directive [11] states that all new buildings are to be designed and constructed as carbon neutral from 2028, thus necessitating that contemporary building design methods must be substantially changed.