The existing CHP refrigeration technology of the company Weihe at the Berlin Grossmarkt site in Beusselstraße is to be replaced by an environmentally friendly refrigeration system, which is operated with the natural refrigerant ammonia. This measure contributes sustainably to environmental and climate relief. Unlike halogenated refrigerants, ammonia has no direct global warming potential (GWP) and enables efficient, energy-saving operation. Accordingly, the total equivalent warming impact (TEWI) of the new plant design is significantly lower than that of the existing plant.