ᐅ Air-source heat pump combined with a hydronic (water-based) fireplace
Created on: 30 May 2018 13:50
A
Almo85
Hello everyone,
We are currently in the middle of building and I need to decide on a heating system soon.
My question is: Is it worthwhile for me to have a hydronic (water-based) fireplace combined with an air-source heat pump and a mechanical ventilation system with heat recovery?
Key data for the single-family house:
- Single-family house with 175 m² (1880 sq ft) of living space
- Annual primary energy demand: 24.50 kWh/m²a
- Energy demand of the building: 13.6 kWh/m²a
- Transmission heat loss: 0.29 W/m²K
- Heated building volume: 705 m³ (24,899 cu ft)
- Thermal energy demand of the building: 9,277 kWh (at 100%)
- Building heating load according to simplified method: 6.5 kW (calculated for me)
- Roth Thermoaura heat pump with 7 kW output
- Helios mechanical ventilation with heat recovery
- Preparation for a hydronic fireplace and accordingly a buffer tank with 850 liters (224 gallons)
My thought is that the air-source heat pump becomes inefficient on cold winter days and consumes a lot of power through the electric backup heater. In this case, the fireplace could cover the peak load and support the heating system. On the other hand, the heating system would need to constantly heat not a 300-liter but an 850-liter buffer tank.
What are your opinions and experiences on this? How cost-effective is this setup overall? I assume I can get firewood relatively cheaply through a friend.
Best regards,
Almo
We are currently in the middle of building and I need to decide on a heating system soon.
My question is: Is it worthwhile for me to have a hydronic (water-based) fireplace combined with an air-source heat pump and a mechanical ventilation system with heat recovery?
Key data for the single-family house:
- Single-family house with 175 m² (1880 sq ft) of living space
- Annual primary energy demand: 24.50 kWh/m²a
- Energy demand of the building: 13.6 kWh/m²a
- Transmission heat loss: 0.29 W/m²K
- Heated building volume: 705 m³ (24,899 cu ft)
- Thermal energy demand of the building: 9,277 kWh (at 100%)
- Building heating load according to simplified method: 6.5 kW (calculated for me)
- Roth Thermoaura heat pump with 7 kW output
- Helios mechanical ventilation with heat recovery
- Preparation for a hydronic fireplace and accordingly a buffer tank with 850 liters (224 gallons)
My thought is that the air-source heat pump becomes inefficient on cold winter days and consumes a lot of power through the electric backup heater. In this case, the fireplace could cover the peak load and support the heating system. On the other hand, the heating system would need to constantly heat not a 300-liter but an 850-liter buffer tank.
What are your opinions and experiences on this? How cost-effective is this setup overall? I assume I can get firewood relatively cheaply through a friend.
Best regards,
Almo
Almo85 schrieb:
It would be great to integrate this as efficiently as possible into the heating system.Contrary to common lay opinions (and typical sales strategies and tactics), this should be avoided in a modern, energy-efficient house whenever possible.
A fireplace in a building complying with energy saving regulations is essentially just a feature in the room and nothing more. (Of course, including all necessary safety installations.)
The principle here is: less is more...