Ennepetal
In Ennepetal, North Rhine-Westphalia in western Germany, a private investor is building three apartment buildings of which one is being used as a reference project for achieving energy efficiency in the most economical way.
Lessons learned What to look out for
- The target is to reach the ‘KfW Efficiency House 55 standard’
- Is the project economically viable and will the investment pay off?
Key facts
Building | Heat Pump and Source | ||
Location | Ennepetal, Germany | Number of HP | 1 |
Construction | ongoing at time of case study intake | Installed power | 46 kW |
Heat distribution | underfloor heating & panel | Operation mode | monoenergetic |
Heated area | – m² | Heat source | ground |
No. of apartments | 12 | Function | Space Heating |
level of insulation | very good | ||
Heating sytem | Domestic Hot Water | ||
DHW system | Electric wall heater | ||
Heat demand | – kWh / (m²a) | DHW demand | – kWh / (m²a) |
Heating temperature | 40 °C | Type of system | central |
Max. temperature | 65 °C | ||
Circulation system | – | ||
Other information | |||
Cost (without drilling) | 70,000€ | COP | 4.4 |
Refrigerant | R410A | ||
Description of the technical concept
In order to reach the target – the ‘KfW Efficiency House 55 standard – ten possible system configurations were compared.
In this particular case, the planners chose the option based on a geotherm brine/water heat pump with an output of 46 kW. An eloBLOCK electric water wall heater secures peak loads and drinking water hygiene. A multi-functional storage tank with a capacity of 2,000 liters serves as a heat buffer to ensure sufficient hot water supply. Space heating is distributed via a panel heating system with a flow/return temperature of 35/30°C. All living spaces are also ventilated in a controlled manner.
This approach massively saves operating costs. A further benefit is that everything comes from a single source. Thus, the various system components are perfectly matched to each other – from the heat pump to the supporting electric heating to the identical control system.
DE006 Ennepetal
- Pictures: https://www.ehpa.org/wp-content/uploads/2023/05/Heat-pumps-in-high-rise-homes_case-studies-from-across-Europe_EHPA_May-2023.pdf (Vaillant) ↩︎