SOLARGE

Scheffelstraße 35

Freiburg, Germany

Multi family house | 29 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description
A 1915 built apartment house unchanged and without any refurbishments since it was erected, was completely energetically renovated in 2005. For this following measure were done: fully insulating of the roof, the cellar’s walls and base-plate as well as facades; installing of dual-pane windows, glazing of balconies to loggias, installing of historical box-type windows and a vestibule; installing of a cistern for using rain water for toilets and installing of a central hot tap water and space heating system based on renewable energies (vacuum tube collector solar thermal system, rape oil CHP and a wood pellet boiler for peak loads).
All heat suppliers have been connected with an intelligent control unit with several malfunction monitoring features as well as remote data access and diagnosis.

Motivation
To verify the possibility of retrofitting and modernisation of a listed building with systematic measures of insulation and state-of-the-art energy supply systems based on renewable energies was the motivation for this project. All measures led to a zero-emission multi family house with stylish apartments.

 


Building

Type of building

Multi family house

Number of users / dwellings, floors

6 dwellings
5 floors

Year of construction

1915

Total effective area (heated)

584 m2

Hot tap water consumption (measured/estimated)

132 m3/a, measured

Whole energy consumption for heating purpose after CSTS implementation

77,000 kWh/a


System engineering

Year of construction of CSTS

2005

Type of collectors

Vacuum tube collectors

Thermal power

20 kWtherm.

Aperture area of collectors*)

29 m2

Buffer storage

1.85 m3

Hot tap water storage

None: hot tap water is directly heated by heat exchangers

Total capacity of boilers with energy source

48 kW, rape oil CHP + wooden pellets boiler

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

59,830 Euro

Cost of the CSTS / gross area of collectors

2,063 Euro/m2

Subsidies

5.3 %


Output

Output of solar heat**)

7,600 kWh/a

Reduction of final energy***)

10,600 kWh/a

CO2-emissions avoided

0.2 t CO2/a

Solar performance guarantee

*) Aperture area = light transmitting area of the front glass
**) measured, between storage and piping to taps (solar system output)
***) related to the measured output mentioned before

 

 


Technical description

The solar thermal system consists of 29 m² vacuum tube collectors mounted on the eastern, southern and western side of the roof. Each part has its own hydraulic circuit which are controlled and switched on the basis of highest solar yields. The solar system is primary preferred by the energy control unit. Further heat generators are connected on demand in following sequence: rape-oil CHP, wood pellet boiler. The whole heat is stored in the buffer storage and controlled by the central unit. Electricity generated from the CHP is used for the heat control system; surpluses are fed in to the public grid. The control unit is equipped with remote data access features which allow adjustments and troubleshooting. This system is maintained via a service contract.
Further heat generators are connected on demand in following sequence: rape-oil CHP, wood pellet boiler. The whole heat is stored in the buffer storage and controlled by the central unit. Electricity generated from the CHP is used for the heat control system; surpluses are fed in to the public grid. The control unit is equipped with remote data access features which allow adjustments and troubleshooting. This system is maintained via a service contract.

 


Owner

VRD GbR
Frau Weissflog
68161 Mannheim, Germany
Phone: +49 621 15901-0
cweissflog@deloitte.de


Planner/architects

Rothweiler Architekten
Zasiusstrasse 12
79102 Freiburg, Germany Phone: +49 761 704270
info(at)rothweiler-architekten.de
www.rothweiler-architekten.de

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