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The regional climate features relatively low average temperatures, very cold winters and frequently cloudy skies. Therefore, it will not be possible to use renewable energies alone for heating and DHW heating.
However, the couple is obliged to use at least some renewable energy due to legislation concerning new buildings. Therefore, they are considering using a hybrid system in which all of the heat generators are perfectly coordinated.
The developers decide to combine a modern gas heating system with environmental heat. A pleasant side effect: this combination is eligible for subsidy. They also consider installing a photovoltaic system, which could supply the electricity needed to run the heat pump.
Last but not least, a ventilation system will provide a comfortable and healthy indoor environment at all times in all apartments and prevent mould from forming.
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The developers must keep the following points in mind to ensure that everything goes to plan:
The building must meet the KfW standard for energy-efficient buildings to receive a heating technology subsidy. Therefore, it needs good thermal insulation and must be air-tight, amongst other things.
As the outer envelope is almost air-tight, a ventilation system must be employed.
The two heating appliances must be linked by a buffer cylinder.
If the heat pump heating system covers the DHW heating, the boiler can be switched off in the warmer seasons. This reduces the cost of fuel still further.
The couple have chosen a high-performance, efficient and environmentally friendly system. The hybrid solution is ideal for heating the planned new apartment block building in the challenging climatic conditions of the highland region whilst keeping costs low.