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Kurztitel: Verbundvorhaben: EnEff: Stadt SWIVT
Ausführende Stelle: Universität Stuttgart - Fakultät 2 Bau- und Umweltingenieurwissenschaften - Institut für Werkstoffe im Bauwesen
Förderinitiative: Energieeffiziente Stadt (EnEff:Stadt)
Laufzeit: 12/2014 bis 03/2018
Bewilligte Summe: 535.535 €
Förderkennzeichen: 03ET1276A
Topics: District concepts, Refurbishment of housing estates, Decentralised energy generation, Energy storage
Innovation: Development of a restructing strategy combined renewable energy generation and storage concepts.
Keywords:
Kurztitel: Verbundvorhaben: EnEff: Stadt SWIVT
Ausführende Stelle: AKASOL AG
Förderinitiative: Energieeffiziente Stadt (EnEff:Stadt)
Laufzeit: 12/2014 bis 03/2018
Bewilligte Summe: 289.047 €
Förderkennzeichen: 03ET1276B
Topics: District concepts, Refurbishment of housing estates, Decentralised energy generation, Energy storage
Innovation: Development of a restructing strategy combined renewable energy generation and storage concepts.
Keywords:
Kurztitel: Verbundvorhaben: EnEff: Stadt SWIVT
Ausführende Stelle: Technische Universität Darmstadt - Fachbereich Bau- und Umweltingenieurwissenschaften - Institut für Statik und Konstruktion
Förderinitiative: Energieeffiziente Stadt (EnEff:Stadt)
Laufzeit: 12/2014 bis 03/2018
Bewilligte Summe: 1.180.980 €
Förderkennzeichen: 03ET1276C
Topics: District concepts, Refurbishment of housing estates, Decentralised energy generation, Energy storage
Innovation: Development of a restructing strategy combined renewable energy generation and storage concepts.
Keywords:

Quintessence

  • Development of a restructuring strategy combined with networked renewable generation and storage concepts
  • Innovative restructuring strategy links the use of energy-efficient technologies
  • Energy-plus module links four existing buildings
  • Affected residents will be involved in the planning
  • Renewable generation and storage concepts will be integrated in the refurbishment of the Postsiedlung housing estate in Darmstadt
  • Modernisation creates new residential space without sealing additional areas

Using the example of the Postsiedlung housing estate in Darmstadt, the researchers are developing a restructuring strategy that links the use of energy-efficient technologies and integrates renewable generation and storage concepts. The new strategy is ideally modular in order to be transferable to similar housing estate structures. Using a newly developed energy-plus module, it is intended to increase the density of the four existing buildings in the Darmstadt housing estate being investigated in the research project.

Project context

Buildings and their energy management are currently largely considered on an individual basis. Energy-plus houses are also mostly designed on an individual basis. Although they provide surplus energy in the annual balance, they make use of the public grids as a buffer, and can therefore contribute to their overloading. Energy-plus housing estates, on the other hand, attempt to ensure the energy balance throughout a group of buildings. However, so far they have been realised exclusively in selected development areas so as to minimise disruptive variables. The cumulative consideration of the generation and consumption of electrical energy creates aggregation effects that smooth out the overall consumption. This enables the stochastic proportion of the consumption to be reduced. This facilitates decentralised provision and at the same time reduces the transport losses and the need for compensation mechanisms at higher network levels. Bundling technologies at the housing estate level (for example, CHP plant, storage systems) creates additional benefits in terms of the investment and operating costs.

Systems with different characteristics are required to generate and store the energy. In order to minimise the costs, different energy technologies can be combined to form hybrid systems and constellations.

Site plan of the Postsiedlung housing estate. The blue line outlines the five buildings that are being investigated as part of the SWIVT project.

Site plan of the Postsiedlung housing estate. The blue line outlines the five buildings that are being investigated as part of the SWIVT project.

© TU Darmstadt

Further images

Model of the Postsiedlung housing estate: The orange buildings were recently refurbished. The blue line outlines the five buildings that are being investigated as part of the SWIVT project.

Model of the Postsiedlung housing estate: The orange buildings were recently refurbished. The blue line outlines the five buildings that are being investigated as part of the SWIVT project.

© TU Darmstadt
The SWIVT vision for energy efficient refurbishment: This includes not only the creation of valuable living space and the dramatic reduction of the energy consumption but also the integration of new components for generating, storing and linking renewable energy at the housing estate level.

The SWIVT vision for energy efficient refurbishment: This includes not only the creation of valuable living space and the dramatic reduction of the energy consumption but also the integration of new components for generating, storing and linking renewable energy at the housing estate level.

© TU Darmstadt
South-west facade of the building block at Moltkestrasse 5-9

South-west facade of the building block at Moltkestrasse 5-9

© TU Darmstadt
North-east facade of the building block at Moltkestrasse 11-15

North-east facade of the building block at Moltkestrasse 11-15

© TU Darmstadt
West facade of the apartment block at Moltkestrasse 19

West facade of the apartment block at Moltkestrasse 19

© TU Darmstadt
Aerial view of the Postsiedlung housing estate in Darmstadt’s Bessungen district.

Aerial view of the Postsiedlung housing estate in Darmstadt’s Bessungen district.

© TU Darmstadt

Research focus

In the SWIVT research project, housing estate modules are being configured and refurbishment strategies and concepts developed at the district level. The research will focus on utilising technological innovations, linking different areas and players and developing modern methods for the monitoring and energy management.

As part of the research project, four existing buildings are being refurbished and linked together using a newly developed "energy-plus module" (heat and electricity produced using PV, solar thermal and possibly CHP). The aim is to increase the residential space. The project can be divided into three phases. Based on a high-resolution, energy-related analysis of the existing housing estate, the first phase will be concerned with developing an energy-positive module in conjunction with the developer Bauverein AG, the energy provider HSE AG and specialists for innovative energy components. Based on the determined load profiles, the second phase will involve the development of energy generation and storage systems at the component level in conjunction with AKASOL GmbH, the construction of prototypes and the design of a master control logic. The third phase includes the trial operation of the individual components as well as the validation of the control system using the linked subsystems. An ecological and economic evaluation of the systems will also be conducted in parallel.

Visualisation of a subarea in the Postsiedlung

Visualisation of a subarea in the Postsiedlung

© TU Darmstadt

Concept

District concept and urban development

The basic two- to three-storey residential buildings in the Postsiedlung housing estate in the Darmstadt district of Bessungen were constructed in 1949 by a housing association in order to create workers' dwellings. In order to increase the volume and density of the residential space, several rows of 1950s buildings outside the project’s section of the housing estate have already been increased in height by two storeys in recent years. Although the other buildings have not yet been renovated, there are also plans to refurbish them. To apply the "energy active" housing estate module, a smaller, two-storey building has been selected, which is planned to be fully renovated. The energy consumption (final energy) of the existing residential buildings corresponds to the un-renovated building standard of the period when they were constructed. They currently lie 3 to 4 times higher than current energy efficiency standards.

Main parameters for the project’s assessment and evaluation strategy

Main parameters for the project’s assessment and evaluation strategy

© TU Darmstadt
Floor plans of the buildings which are to be refurbished

Floor plans of the buildings which are to be refurbished

© TU Darmstadt
The district concept: The energy generating components will be integrated in the refurbished buildings and in additional densification elements such as greenhouses and park facilities. An energy-positive housing estate module controls the interconnected generation, distribution and storage systems.

The district concept: The energy generating components will be integrated in the refurbished buildings and in additional densification elements such as greenhouses and park facilities. An energy-positive housing estate module controls the interconnected generation, distribution and storage systems.

© TU Darmstadt
Workflow of the SWIVT project in the subprojects and project phases.

Workflow of the SWIVT project in the subprojects and project phases.

© TU Darmstadt

Energy concept

The existing building stock provides the critical mass in meeting energy policy targets in the next few decades. The efficient use of energy will become the focus in renovation projects. Strategies for generating and storing energy locally will also, however, play an increasing role. The aim of the SWIVT project is to develop a refurbishment strategy for the Postsiedlung housing estate in Darmstadt – combined with renewable generation and storage concepts using innovative energy technologies. The strategy being developed will ideally be modular to enable it to be transferred to similar housing estate structures. The approach envisages the densification of the existing buildings with an "energy positive" housing estate module. In addition to high quality residential space, the module consists of innovative components for generating, storing and connecting electricity and heat as well as a thermoelectric control concept. This makes it possible to considerably improve the energy balance of the housing estate in one step – with minimal intervention in the existing building stock. The housing estate module also acts as a generator for sustainable district development, for example by improving the acceptance of innovative technologies such as energy storage systems.

An energy concept at the housing estate level has the advantage that it can smooth out stochastic fluctuations in individual generation and consumption curves. Positive impacts also include the immediate use of larger amounts of the energy produced and better sizing and control of the storage systems.

An energy concept at the housing estate level has the advantage that it can smooth out stochastic fluctuations in individual generation and consumption curves. Positive impacts also include the immediate use of larger amounts of the energy produced and better sizing and control of the storage systems.

© TU Darmstadt

Project data

District data

Measures  
Gross floor area, before 8.056 m²  
Living area, total 8.056 m²  
No. of residential units 79 WE  
SOI (Site Occupancy Index) 0,16 SOI  
FSI (Floor Space Index) 0,77 FSI  
     
Further data    
Utilisation type, State of construction and refurbishment, Age structure Purely residential , Poor – requires considerable refurbishment, Built between 1949 and 1957 (5 buildings)  
Ownership structure Renting through municipal building society  
Heating system Building-based central heating (natural gas),3 x individual gas-fired central heating systems (natural gas)  

Last Update: 26. September 2016

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