Solar Heat Supply to the HELIOS Residential Complex at Rostock-Brinckmanshöhe

 

Client:
WIRO Wohnen in Rostock Wohnungsgesellschaft mbH
Lange Strasse 38

D-18055 Rostock

 

Land/Region:

Germany

 

Period:

2000 - 2002

 

Investment:

Euro 1,700,000

Project Description:
Solar collectors delivering 400 MWh of solar heat in summer are installed on 11 individual roofs of the building.

 

There is a groundwater-bearing bed in the underground of the site which is developed by two wells with an internal distance of approx. 55 m. Both wells are equipped with pump and injection casing, thus allowing for water production in either direction. Heat exchangers for the charging and discharging of the aquifer heat store are integrated in the connecting surface pipe system.

 

The water produced from the cold well at a temperature of 10 °C is heated in summer by solar energy and injected in the warm well. The direction of flow is reversed in winter. At the beginning, the production temperature is 45 °C. A heat pump pre-heating the return heating water is integrated after the direct heat exchanger.

 

Due to the discrepancy in terms of time between the energy demand of the building and the solar radiation, only 159 MWh of solar heat can be used directly. The rest is fed into the aquifer store. 148 MWh are recovered in winter. The solar coverage coefficient amounts to more than 60 %.

GTN Services:

  • Preliminary geological exploration
  • Numerical simulation of the aquifer store operation
  • Design, call for bids and construction management of the solar collector unit, the aquifer heat store, the heat pump incl. piping, electrical installations and automation system.

Facts and Figures:
Object:

  • Residential area 7,000 m²
  • 108 flats

Generation units:

  • 1,000 m² solar collector
  • Aquifer store
    • Effective horizon: Quaternary
    • 2 wells
    • Depth 20 m
    • Flow rate 20 m³/h
    • Charging temperature 50 °C
  • 105 kW heat pump
  • 250 kW condensing boiler  
  • 30 m³ buffer store
Consumer units:
  • Heat demand heating 320 MWh/a
  • Heat demand sanitary hot water 180 MWh/a
Heating network parameters 45 °C/30 °C
PDF

 

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