The Class 1 project

The Class 1 (Cost effective advanced low energy solutions) project is supported by the European commission through the Concerto programme.
SUDEN is the partner in charge of dissemination. Documents and more information are available on


“The Class 1 project is focused on the optimisation of sustainable energy systems in local communities, through an innovative integration of RE technologies with ultra low-energy buildings. The bio-mass CHP system produces electricity and heat that are distributed directly to the use for heating in an innovative local district heating system for the dense, low-rise houses, and through the electricity network to heat the single family houses by heat pumps. Solar heating systems integrated in the network – and individual systems on the single family houses will be supplementing the CHP and taking over in summer months when it is shut down. An advanced Building Energy Management System will control the energy supply, the thermal storages (for solar and for heating energy pulses for the CHP plant).”

« The energy supply idea of the Class 1 project is to integrate a bio-mass CHP plant with heat pump heating of the single-family houses with summer solar heating for domestic hot water.”

The Municipality of Egedal (DK) has decided to strengthen the energy requirements for a new settlement to be erected in the municipality. In the years 2007-2008 a total of 442 dwellings will be designed and constructed with a heating demand corresponding to the new Danish low-energy standard referred to as “low-energy class 1” in a new settlement called Stenloese Syd. This means that the energy consumption will be 50% below the new energy regulations. 69 dwellings will be designed and constructed as so-called “passive house” buildings with a yearly heating demand of 15 kWh/m². Furthermore the Concerto community will include a kindergarten and an activity centre for elderly people (see the map on the last page).

The Class 1 project will use this strengthening of the energy requirements to boost and drive the technological development of 6 selected technologies/building components covering the 3 areas: Eco-buildings, Renewable Energy Supply and intelligent energy management system and to prove the economical and environmental benefits of ultra-low energy buildings integrated with biomass- and solar heating based renewable energy supply. The demonstration project is supported by specific design guidelines developed within the project covering Indoor Environmental Quality and energy savings as well as requirements for monitoring and evaluation. The project also covers activities dealing with town planning and regulatory means and has eco-labelling as a cross cutting activity to increase the general awareness about ecological issues. Training activities are targeted towards the technical personnel of the local authorities, the builders and the users.

The technical objectives are:

  1. To optimise this supply combination so that the heat from the CHP plant goes to the dense, low-rise buildings of the settlement and the electricity to the heat pumps heating the single family houses.
  2. To illustrate that a local distribution network can still be a viable option even when supplying ultra low-energy houses.
  3. To integrate and use the solar heating system storage tanks as buffer tanks for the CHP-produced heating.
  4. Finally, to demonstrate how this integrated supply system can be monitored and controlled by an advanced, yet easy to use, Building Energy Management System.

At least six technologies that are crucial to the overall goals of achieving ultra-low energy houses with a high share of renewable energy supply integrated in the supply system have been selected.


You can download

and Also : D21 guidelines Class 1

© 2009