#4: Energy efficiency

What measures do you implement to operate as energy-efficiently as possible?

Ben Balon
Engineer at EDEKA Minden-Hannover:
"Sophisticated and coordinated measurement, control and regulation technology (MSR technology) is used to achieve optimum system conditions and the best possible energy utilization, taking weather forecasts into account. In summer, for example, the cool night air is used to cool down the building so that air conditioning can continue to be dispensed with in future warmer summers. The technical systems can be monitored and controlled remotely via a building management system (BMS). This reduces operating costs and ensures efficient system operation in the long term.
In addition, the building is a passive construction and is heated entirely using waste heat. Photovoltaic systems will be implemented both on the roof and in the car park in the form of solar carports. Battery storage units will also be installed to utilize the building's own electricity. In keeping with the concept of sustainability, half of the roof will also be greened and the rainwater will be collected and used for irrigation."

Waterloop - The energy-efficient alternative to CO2
The Waterloop is a fully integrated refrigeration system in which plug-in refrigeration units are connected in a closed water circuit. The resulting waste heat is transported out of the store via a pipework system. The waste heat is recovered by means of a heat exchanger and used to heat the store. On particularly cold days, the peak load is covered by an additional air-to-water heat pump. The passive house standard and the exclusive use of panel heating systems enable low flow temperatures for the heating and therefore the greatest possible utilization of heat. Energy-intensive door air curtains are replaced by unheated wind deflectors.
This system makes it much easier to relocate refrigeration units in the building in the future than with refrigeration units connected to a central refrigeration system. The elimination of the central refrigeration system also saves space for a refrigeration machine room. The refrigeration units themselves are energy-optimized thanks to insulated glazed doors and improved thermal insulation.

Lighting
The building is naturally lit via large glass surfaces on three sides of the building and so-called daylight spotlights - chrome-plated tubes that absorb daylight on the roof surface and emit it again inside the building. A daylight control system regulates the artificial light downwards as required or switches it off completely.

Energy consumption
The energy consumption of the EDEKA Future Market has been significantly reduced compared to an existing new building with the same sales area. While the heat requirement of recently realized new buildings amounts to 100 kWh/m² per year, the heat requirement of the EDEKA future store will be approx. 17 kWh/m² per year.