Control strategy optimization


Cognitive optimization

Control interface Copyright: © EBC

Optimizing building automation systems includes a large potential in terms of energy efficiency and thermal comfort. Once parameterized, building automation systems are often left alone when handed over after construction completion due to the lack of skilled professionals, time or money. Two approaches, cognitive based and algorithm based, are carried out to optimize the building automation at the E.ON ERC main building. The process of better understanding the characteristics of the energy concept, developing new control strategies, evaluating them by means of simulations, and especially applying them to the building is called cognitive optimization.



Copyright: © EBC

The goal of the EU project PEBBLE is to maximize the net energy produced (NEP) by buildings through intelligent matching of their energy consumption to energy generation. The challenge lies in the ability of the building control system to make (almost) real-time decisions under the constraints of unpredictable user-behavior, occupancy scheduling or weather conditions. For the E.ON ERC main building PEBBLE will be implemented on the north zone of the concrete core activation, where it will control the temperature set points of the façade ventilation units and the overall power of the water circuit. An initial controller will be parameterized and tested using thermal simulation models of the building.


Control strategies of decentralized façade ventilation units

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The fans for supply and exhaust air operate with speed control. This allows the volume flow to be adapted to the actual demand for fresh air, which is calculated via the sensor data of relative humidity, CO2 and VOC. The air-conditioning process works with an adaptive heat recovery system. This system provides the possibility either to recover heating (or cooling) energy or to bypass the heat exchanger, if ambient air can be used for air-conditioning. Additional water based cooling and heating devices are available as backup. To optimize the control strategy, a software-in-the-loop concept was also developed.


Exergy-optimized operational management

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The operation of the building and its technical equipment is analyzed using an exergy-based analytical technology, which in particular involves sensible utilization chains for energy transformation. This method enables a thermodynamically valid evaluation of the entire energy supply chain – starting from the supply structure and energy transformation chain extending down to the energy streams within a building. The guiding principle of developing and later on optimizing a control strategy using an exergy-based approach is the exergy consumption minimization of each system component. Finding an adequate reference point and determining corresponding formulas for the exergy consumption of different components will contribute to the state of the art development in the exergy field.