gnika77
2019-03-22 14:23:20
- #1
Hello everyone,
I have an air heat pump with BAFA funding...
1. The BAFA list essentially includes all heat pumps that fundamentally meet the requirements for funding (SG-Ready).
2. The funding requires, however, that a seasonal performance factor (SPF) of at least 4.5 must be achieved. Until March, this could still be calculated with the old version of the VDI. From March onwards, it must be calculated according to the new VDI. The new calculation method is closer to practice. That’s why generally worse SPFs come out. During the transition period, it could happen that the online calculator of the BWP showed a worse seasonal performance factor of less than 4.5 according to the new method, but the manufacturer could provide a calculation using the old method where the SPF was better than 4.5. In the future, however, only the new VDI is to be used for BAFA funding.
3. In new buildings, with proper planning, good air heat pumps can indeed achieve calculated SPFs above 4.5 from NAT = -14°C. For example, Nibe, IDM or Novelan should be mentioned. Essentially, it is important to plan the heating surfaces so that you reach an average flow temperature (VLT) of 30°C. In normal rooms, underfloor heating is usually sufficient for this. In the bathroom, wall heating should be considered.
4. Particularly good for lowering the VLT and achieving a good seasonal performance factor is the concrete core activation (BKA). This increases the efficiency of the heat pump on the one hand. On the other hand, BKA is very well suited for cooling via heat pump. In summer, this is a comfort aspect not to be underestimated. Compared to the costs (essentially just a few pipes), the benefit of BKA is extremely high.
5. When thinking about an air heat pump, one should definitely consider whether a brine heat pump with a trench collector (Ringgrabenkollektor) would not be the better alternative. This collector can be realized on many, also small plots. Taking into account the higher BAFA funding for a geothermal heat pump, with a trench collector and geothermal heat pump in new buildings, it is even cheaper than with an air heat pump. I would have done a trench collector myself. Unfortunately, geothermal energy was prohibited by the development plan. That’s why it became an air heat pump with photovoltaics.
Greetings Nika
P.S. Are links actually allowed to be posted here now? There is a lot of information on the points on the internet, which is much more detailed/helpful.
P.P.S. Under no circumstances install a heating buffer with a heat pump.
I have an air heat pump with BAFA funding...
1. The BAFA list essentially includes all heat pumps that fundamentally meet the requirements for funding (SG-Ready).
2. The funding requires, however, that a seasonal performance factor (SPF) of at least 4.5 must be achieved. Until March, this could still be calculated with the old version of the VDI. From March onwards, it must be calculated according to the new VDI. The new calculation method is closer to practice. That’s why generally worse SPFs come out. During the transition period, it could happen that the online calculator of the BWP showed a worse seasonal performance factor of less than 4.5 according to the new method, but the manufacturer could provide a calculation using the old method where the SPF was better than 4.5. In the future, however, only the new VDI is to be used for BAFA funding.
3. In new buildings, with proper planning, good air heat pumps can indeed achieve calculated SPFs above 4.5 from NAT = -14°C. For example, Nibe, IDM or Novelan should be mentioned. Essentially, it is important to plan the heating surfaces so that you reach an average flow temperature (VLT) of 30°C. In normal rooms, underfloor heating is usually sufficient for this. In the bathroom, wall heating should be considered.
4. Particularly good for lowering the VLT and achieving a good seasonal performance factor is the concrete core activation (BKA). This increases the efficiency of the heat pump on the one hand. On the other hand, BKA is very well suited for cooling via heat pump. In summer, this is a comfort aspect not to be underestimated. Compared to the costs (essentially just a few pipes), the benefit of BKA is extremely high.
5. When thinking about an air heat pump, one should definitely consider whether a brine heat pump with a trench collector (Ringgrabenkollektor) would not be the better alternative. This collector can be realized on many, also small plots. Taking into account the higher BAFA funding for a geothermal heat pump, with a trench collector and geothermal heat pump in new buildings, it is even cheaper than with an air heat pump. I would have done a trench collector myself. Unfortunately, geothermal energy was prohibited by the development plan. That’s why it became an air heat pump with photovoltaics.
Greetings Nika
P.S. Are links actually allowed to be posted here now? There is a lot of information on the points on the internet, which is much more detailed/helpful.
P.P.S. Under no circumstances install a heating buffer with a heat pump.