Central building control technologyHuge potential for energy saving
Defined as a key topic for EVVAGRI 302: Energy; 305: EmissionsUN Sustainable Development Goals (SDGs), No 7: Affordable and clean energy; No. 12 Sustainable consumption and production
EVVA is planning to introduce a central digital building management system (BMS). The advantages will become visible for the first time in 2021, and the BMS will subsequently be extended to all HQ buildings. In the first step, it will centrally control the fire alarm system in the extension and, from 2024, the entire building management system. We expect this to have a very positive impact on energy consumption and emissions reduction, as the following targets show.
Concrete core activation in preparation
The extension to the headquarters will also be equipped with concrete core activation (also known as building component activation) in 2021 for optimal heating and cooling. Here, hoses in which water can circulate as a heating or cooling medium are cast directly into the ceilings. The flow-through ceilings are thermally activated as transfer and storage mass. They absorb or dissipate heat over their entire surfaces – and thus ensure a uniform temperature throughout the year. Due to the large transfer surfaces, water does not have to be heated as much as, for example, with conventional central heating with radiators. The system works with air heat pumps, air cooling pumps and heat exchangers.
"Since concrete stores and conducts the respective temperature of the water particularly well, the system can be used for both cooling and heating. Air pumps regulate the exchange of heat and cold", summarises Martin van Berkum, EVVA Head of Production Technology.
BMS implementation at EVVA since 2015:
More energy-efficient coordination of cooling In 2017, EVVA merged all five main cooling units. A central return cooler now switches on and off as required. In the past, the individual units cooled independently without a central control system to regulate the exact demand. We therefore consumed energy unnecessarily. Through this measure, EVVA saves 68,137 kWh of energy every year, which is as much as approx. 14 private households consume annually (assumption: 5,000 kWh / year). We have set the goal of achieving this improvement also for our heating system
Dissipation of machine waste heat A fan was installed on one of our large production machines in 2016/2017 to dissipate the waste heat upwards. In the case of this machine, the resulting energy saving of 5,320 kWh was significant because it is completely enclosed, i.e. it has a protective all-round shell, and one cooling unit is required per processing unit. This intensive production process generates more heat and therefore more electricity is required for cooling. Thanks to the fan, which requires far less energy than the cooling units, EVVA has been able to save more than the annual requirement of a private household. EVVA plans to also apply this concept to other machines
Leaks eliminated With new piping and the installation of new valves and shut-off valves, EVVA has eliminated leaks in the compressed air lines. This means that the compressors can run for a shorter period of time and that EVVA could save 74,000 kWh of energy per year (= demand of approx. 15 private households). Comparison: A hole measuring 1 mm in diameter releases 75 litres of air per minute, at a cost of 480 euros per year. Find out more under Compressed air optimisation
How: Beginning with a centrally controlled fire alarm system in the new extension in 2021 to a fully centralised building management system (BMS) for the entire headquarters in 2024.
Positive effects: The BMS will analyse the power requirements, idling, operating times and peak times of heaters and air conditioners in detail. The built-in AI then automatically regulates the system – e.g. according to outdoor temperature – and in an energy-efficient way. The new building control system will result in an estimated energy saving of 100,000 kWh per year (the equivalent of powering 20 single-family homes) and 40 tonnes less CO² per year.
How: Expansion of the headquarters is scheduled for completion in 2021. Heating and cooling then takes place via state-of-the-art concrete core activation. EVVA uses the heat/cold in the concrete, which always has a constant 15 degrees – for heating in winter and for cooling in summer. This new EVVA building will then be independent of fossil fuels. Read more in the above text.
Positive effects: EVVA thus saves around 50,000 kWh of the natural gas consumption at its headquarters per year. That’s 3.7% of the total kWh consumption. This is enough to supply the equivalent of 10 single-family homes with energy per year. CO² emissions are reduced by 14 tonnes per year.