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Hybrid system concept for a sustainable heat supply in existing buildings
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Hybrid system concept for a sustainable heat supply in existing buildings

Brussels, Belgium
Brussels, Belgium
  • Other building
  • Renovation
  • UltraGas, Heat Pump

The building forms part of a mixed-use residential complex in Brussels, comprising numerous residential units as well as social and religious facilities. As part of the modernisation of the heating supply, Hoval implemented a hybrid system concept that intelligently combines heat pump technology with condensing boiler technology.  

Make use of existing infrastructure, reduce reliance on fossil fuels

The planners’ aim was to develop a system concept that consistently incorporates renewable energy and measurably reduces the consumption of fossil fuels. To minimise the cost of modernisation and continue to make use of the existing infrastructure, the current system of heat distribution by means of radiators was to be retained as far as possible. 
 
The project serves as a prime example of how existing buildings with radiator systems can be modernised economically and adapted to meet the requirements of an increasingly renewable energy supply.

A smart combination of a heat pump and condensing boiler technology

The new heating supply combines heat pump technology and condensing boiler technology to form a high-performance integrated system. At the heart of the system are a Hoval Belaria pro (50) air/water heat pump and a Hoval UltraGas 2 D gas condensing boiler with an output of 250 kW (2 × 125 kW). The system is complemented by a Hoval EnerVal (1000) buffer storage tank and the Hoval TopTronic E system control unit and includes integration into the building management system.

The modulating heat pump accounts for the majority of annual heat generation. The dual-condensing boiler is only switched on when there is an increased demand for heat (peak loads) or when outside temperatures are low. This makes it possible to significantly reduce the use of fossil fuels, whilst maintaining comfort and security of supply.

Thanks to flow temperatures of up to 70 °C, the Belaria pro (50), which runs on natural refrigerant R290, can supply the existing radiator system. As a result, extensive adjustments to the heat distribution system were not required, and the cost of the modernisation was significantly reduced. Furthermore, the Belaria pro impresses with its quiet operation – an additional advantage for use in residential construction. 

The natural gas-fired UltraGas 2 D, featuring two independently operating gas condensing boilers and a shared flue gas line for heating and domestic hot water production, ensures additional operational reliability and high system availability. The twin-boiler design allows for flexible heat output and guarantees a reliable heat supply even during maintenance work or in the event of a fault.  

Setup of the reference plant

Hoval Belaria pro (50) 
Hoval UltraGas 2 D
Hoval EnerVal (1000)

The benefits of the hybrid solution at a glance 

  • High operational reliability thanks to hybrid heat generation and a dual-boiler design.  

  • Efficient operation thanks to the interplay between the heat pump, condensing boiler technology, system controller and building management systems.  

  • A significant reduction in gas consumption due to the high proportion of heat generated by heat pumps in the annual heat production.  

  • Air/water heat pump with natural refrigerant R290 and high flow temperatures, designed for retrofitting existing buildings. 

  • Cost-effective modernisation of existing buildings, making extensive use of existing heating systems. 

Modernisation of existing buildings – safe, efficient and future-proof.

The project demonstrates how existing buildings can be modernised economically and cost-effectively. Thanks to the intelligent combination of a heat pump and condensing boiler technology, it has been possible to increase the proportion of renewable energy, reduce the use of fossil fuels and, at the same time, ensure a high level of supply and operational reliability.

For customers, planners and installers in Belgium, Edergen – Hoval’s local partner – is on hand to provide a full range of services, from advice and quotations to project support and assistance with installation and commissioning.

Product advantages

Hoval Belaria pro (50)

  • Saves money with top year-round efficiency levels. 
  • Exceptionally quiet thanks to perfectly tuned components. 
  • Added comfort in summer due to built-in CleverCool cooling function. 
  • Quick and easy installation. 

Hoval UltraGas 2 D

  • Cost-effective operation. 
  • A secure investment. 
  • Compact transport and installation dimensions. 
  • Suitable for hydrogen and biomethane. 
  • Straightforward integration into heating systems.
Interested?

Interested?

If you'd like to know more about Hoval's solutions, feel free to contact us.