After the first phase of renovation the still existing gas boiler provided space heating and hot tap water. The already installed field of vertical borehole heat exchangers was used for direct space cooling in summertime. Early 2010 the fossile boiler was replaced by a ground source heat pump. During the heating period the new geothermal heat pump is supported by three air-to-water heat pumps which are using waste heat from the printing plant as the heat source.
Finally, the primary energy consumption for heating, cooling, ventilation and lightening was decreased by 58 percent, from 322 to 134 kWh/m2a.
Source: BINE Informationsdienst