Nürnberg, Germany

Nürnberg (Germany)

Demo responsible: BoostHEAT

Type of building: Multifamily residential (1897). Apartment block with 4 floors (total of 320 m2) near the town center of Nürnberg. Solar energy potential: 50 m2. Existing individual gas boiler per flat supply space heating through radiator circuit, DHW storage withan electric heater. House Energy Label F. Yearly demand: 4 m3 wood, 14 MWh gas, 15 MWh electricity
Demonstration action:

  • TP2, Mixed solar-assisted/ parallel integration: HP boiler (BoostHEAT) for space heating and domestic hot water (DHW) with existing gas boiler backup; Thermal output from solar hybrid PV-T (DUALSUN) to cover heat demand and to assist BoostHEAT evaporator; PV-T (DUALSUN) electricity production for building appliances.
  • Solar panels installation on flat roof and connections to technical room
  • BoostHEAT and tank installation in the technical room
  • Integrated control system for the smart operation of H&C and electrical systems
  • Redesign centralized SH and DHW distribution system for the 4 flats
  • DHW and SH meters per flat for operation costs breakdown
  • High performance in space heating and DHW from solar hybrid PV-T (DUALSUN) and thermal energy storage (RATIOTHERM) + HP boiler (BoostHEAT)
  • Electricity production from solar hybrid PV-T (DUALSUN) increases building self-consumption

Replicability potential:

  • Apartment blocks (and tertiary buildings) with natural gas connection. New and renovated buildings
  • All climates

Technical risks:

  • Very limited risk in coupling both innovations (i.e. HP boiler and solar hybrid PV-T)

Difficulties encountered:

Most of the difficulties encountered are related to the fact that is an historical building, such as

  • Roof reinforcement requirements
  • Replacement of individual heating systems with centralized heating system and distribution loops path availability for pipes, chimneys and wires (roof, ceilings)
  • Limited roof availability reduced 75 to 48 m² installed solar collector area
  • Limited door, stairway, and basement’s room dimensions for components handling and installation
  • Secured storage box for components after delivery until actual installation in the building
  • Synchronizing SunHorizon TP1 integration work regarding financial, design and installation with multiple owners’ decisions (variable social and cultural origins, ages, living styles, occupancy, incomes) caused only one BH20.connect being installed instead of two originally (to cover more heat demand in more apartments)
  • Finding professional installers for a quite complex system integration in building in extremely dynamic market after Covid-19 crisis

Expected savings:

  • 22% primary energy saving

  • 31% GHG emissions savings

  • 15% renewable energy ratio

  • 32% cost bills reduction

Demo Nurnberg

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