Michal Touš

Using a utility system grey-box model as a support tool for progressive energy management and automation of buildings

Abstract The research presented here is focused on improving energy management in a building complex through analytical and empirical modelling of its utilities. First, we introduce current European policy on energy savings in buildings. The modelling starts with a literature review and a thorough study on a heating and cooling system of a particular building complex—the National Theatre in Prague, Czech Republic. Standard building automation and control systems cannot optimize the building’s operations to the fullest and thus do not provide the best cost savings possible. A mathematical model of the energy system and its integration into a building control system is an essential prerequisite for any optimization here. The development of a model which can be integrated into a control system during real-time operation of the building is a very complicated task. Our paper presents a procedure to develop such a model and methods to apply it in a real-life operation. First, the mathematical model is implemented in a simulation tool, which enables an efficiency evaluation of the system. This simulation tool offers especially important support for building automation and control systems when deciding the most effective operation of heat or cold utilities. The model greatly helps in monitoring and optimizing daily offtake limits for natural gas, which is highly appreciated by the building’s technical management. Our practical applications of the model show new possibilities for simulation and optimization calculations which are completely unique in building management systems so far.

Improving the Energy Management of a Building Complex through Utility System Modelling

Abstract According to Escriva-Escriva (2011), utility systems are often managed by non-specialised technicians who need understandable and cost-effective actions to be implemented. Therefore, we can assume that tools for simulation and optimization may further improve operation of utility systems. However, a good model is essential for these purposes. The paper deals with complex utility system modelling using operational data. Our experience shows that data acquisition in common utility system of a municipal building is sometimes poor. Usability of a model based on data of lower quality is discussed and demonstrated on the case of the utility system of The National Theatre building complex in Prague, the capital of the Czech Republic. It shows that even model based on poor data may be useful for some energy management improvements.