Krommen Kelchbach Pilot Site

The Krommen Kelchbach district is situated in Naters – Switzerland. A low-temperature district heating and cooling network (LTN) was built in 2012, and has been in operation since 2013.

The LTN connects 13 residential buildings, which were built between 1970 and 2010, to ground water wells, which act as a geothermal source.

The pipes bring water at 8-18°C to the technical room where it passes through a filter and then to the heat exchanger. The return pipes bring water back to ground water at 4-14°C (a temperature difference of maximum 4°C is fixed).


The site layout at the Krommen Kelchbach Pilot Site

From the exchanger, the water goes to each building, using the anergy network. The cold water can be either  used through a heat exchanger into the building for cooling using the heating/cooling floor system, or be used as source for the heat pump that produces warm water for the heated floor system and domestic hot water. The water, which has seen a change in temperature, goes back into the anergy network until it reaches the main heat exchanger situated in the technical building.

The system is managed by a Saia automation system that measures temperatures and mass flows continuously.

As a key component, cheap hardware will be installed on each heat pump or key component, permitting all components to communicate providing new possibilities to manage the anergy network.

By participating at the Sim4blocks project, Elimes aims to create new opportunities for the energy networks like:

  • Reducing the energy consumption when no energy is requested or when the system could be used differently (thermal inertia use)
  • Giving flexibility to the power grid manager when component use can be time-shifted (pumps, heat pumps)
  • Connecting more buildings to the grid without changing the network dimensions if the energy demand can be sequenced
  • Integrate renewable energy into the anergy network
  • Giving direct feedback to users or network managers and reduce system failures.