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EnEff Campus TU Braunschweig 2020

EnEff:Stadt - Forschung für die energieeffiziente Stadt
Centralcampus TU Braunschweig

Aerial view of the Central Campus at TU Braunschweig

© TU Braunschweig, Institut für Gebäude- und Solartechnik (IGS)

Settlement summary

Neighbourhood
Project status Projektstatus: Phase 3Realisation
Location of local community Nordöstliches Stadtgebiet, Universitätsviertel: Nord-, Ost- und Zentralcampus, 38106 Braunschweig, Stadt Braunschweig, Niedersachsen
Settlement in figures 192 km², 249.485 residents (as of: 31.12.2014)
Developer, organizer Technische Universität Braunschweig
Settlement University campus, institute buildings
Utilisation type University campus: Institute buildings, administrative buildings, laboratories, lecture halls, cafeterias, library, workshops
Site area for the Central, North and East Campuses 589.174 m²
Gross floor area (according to DIN 277) 449.247 m² vorher
UFA 0, Usable floor area not utilised 8.112 m²
UFA 1, Living and communal 7.488 m²
UFA 2, Office area 69.707 m²
UFA 3, Production, experiments 75.267 m²
UFA 4, Storage, distribution 34.965 m²
UFA 5, Training, teaching and culture 58.168 m²
UFA 6, Health and care 139 m²
UFA 7, Other useable floor area 24.458 m²
TFA, Technical building services floor area 29.592 m²
CFA, Circulation floor area 83.502 m²
SOI (Site Occupancy Index) 0.24
FSI (Floor Space Index) 0.63
Age structure Buildings of all ages: Historical buildings, Wilhelminian, 1950s modern style, utilitarian buildings from the 1960s and ‘70s, new-build schemes – a total of approx. 200 buildings, of which 136 are classified as being relevant to the project.
State of construction and refurbishment Mixed – some renovation needed, building envelopes and plant technology (in particular air-conditioning systems) mostly do not correspond to the current state of technology. Considerable potential for optimising the existing plant technology.
Heating system 99 % of the university buildings supplied with district heating from CHP. Individual, isolated buildings with central heating systems (natural gas, heating oil).
Ownership structure Approx. 95 % of the buildings are owned by the Technische Universität Braunschweig and in owner-occupation. The TU BS rents approx. 5 % of the building space.
Project themes

Project description

As part of the completed research project, entitled “EnEff Campus: bluemap TU Braunschweig”, an integral energy efficiency master plan was developed for the campus at the Technische Universität Braunschweig. In line with the ambitious goals set by the German federal government’s Energy Concept, concrete measures partially aimed at reducing the primary energy by 40 % by 2020 shall be realised, scientifically monitored and measured during operation. This objective corresponds to a doubling of the requirements stipulated by the German federal government for the entire existing building stock on route to transforming the energy supply by 2050.

The master plan: Results of the survey of the existing buildings and concept development

The following specific measures were developed in the “EnEff Campus: bluemap TU Braunschweig” project as part of the master plan:

  • Building envelope

    Energy efficient refurbishment of the building envelope to EnEV 2009

    • Investment costs: €120 million (€300/m²NFA)
    • Cost savings: €1.6 million p.a.
    • Amortisation: > 20 years
    • Primary energy: -9 %
    • CO2 emissions: -12 %

  • Biomethane CHP

    Installation of a biomethane CHP plant with a thermal combustion capacity of 526 kW for supplying the East Campus and a smaller CHP plant with 148 kWtherm. for supplying the North Campus

    • Investment costs: €590,000
    • Cost savings: €320,000 p.a.
    • Amortisation: 2 and 6 years
    • Primary energy: -3 %
    • CO2 emissions: -10 %

  • Photovoltaic roof area analysis

    The TU Braunschweig’s entire building stock was tested in terms of its suitability for integrating photovoltaics. Here the existing roof coverage with diverse technical installations and the shading from neighbouring buildings and trees were taken into account. Not taken into account were the condition and load-bearing capacity of the roofs and conservation requirements for individual buildings.

    • Investment costs: approx. €7.3 million (3.0 MWp)
    • Electricity savings: 2,590 MWh p.a.**
    • Cost savings: €480,000 p.a.
    • Amortisation period: 10-12 years
    • Primary energy: -6 %
    • CO2 emissions: -5 %

  • Area efficiency

    Reduction of existing office space from approximately 60,000 m² or 15 m²/person (assessment according to DIN V 18599-10 as low to medium occupancy) to approximately 10 m²/person (high occupancy). This corresponds to a reduction of the office space of approximately 20,000 m². In addition, the elimination of the office space will also reduce associated ancillary areas such as corridors, toilets, storage and kitchenettes by a further 20,000 m².

    • Investment costs: n.n.
    • Heat savings: 2,680 MWh p.a.
    • Electricity savings: 670 MWh p.a.
    • Cost savings: €436,000 p.a.
    • Primary energy: -3 %
    • CO2 emissions: -3 %

  • Building services equipment

    Energy efficient optimisation of all existing ventilation systems (HVAC systems) > 1,000 m³/h.

    • Investment costs: €4 million
    • Electricity savings: 5,950 MWh p.a.
    • Cost savings: €1.1 million p.a.
    • Amortisation: 2.5 years
    • Primary energy: -14 %
    • CO2 emissions: -12 %

  • Lighting

    Replacement of the installed lighting in all circulation areas (corridors and stairways) and office and laboratory areas, use of LED lighting.

    • Investment costs: €2.57 million
    • Electricity savings: 3,050 MWh p.a.
    • Cost savings: €570,000 p.a.
    • Amortisation: 3 years
    • Primary energy: -8 %
    • CO2 emissions: -6 %

  • Technical equipment

    Replacement of all old refrigerator and freezer equipment. Extrapolation based on the devices recorded and documented in existing building stock (approx. 70 % of appliances are in Energy Efficiency Class D and "poorer").

    • Investment costs: €1 million
    • Electricity savings: 950 MWh p.a.
    • Cost savings: €175,000 p.a.
    • Amortisation: 5 years
    • Primary energy: -3 %
    • CO2 emissions: -2 %

  • User behaviour

    Energy savings by means of various types of measures: Participation/interaction with users; information (campaigns) and feedback (e.g. on the energy consumption)

    • Investment costs: €120,000
    • Cost savings: €900,000 p.a.
    • Primary energy: -8 %
    • CO2 emissions: -7 %.

The implementation phase

The aim of the “EnEff Campus 2020” follow-up project launched in September 2015 is to realise the conceptual implementation plan developed in the first phase. The integral concept consists of 4 strategies for optimising the energy efficiency of the campus. In the 3-year follow-up project these will be implemented for a large proportion of the roughly 200 buildings on the campus (approx. 400,000 m² NFA). Parallel to this, a comprehensive monitoring and evaluation concept will be established, whereby the focus of the research will be on demonstrating how the measures can be implemented in practice. These encompass not only new construction, refurbishment and maintenance but also energy supplies, user motivation and information as well as urban development. Another focus of the research is the development of an integrated technology research platform. Its tasks and, simultaneously, central components: transparency of the energy consumption (signal analysis), intelligent control (Internet of Things) and automated monitoring (state machines). The aim of the “EnEff Campus 2020” follow-up project launched in September 2015 is to realise the conceptual implementation plan developed in the first phase. The integral concept consists of 4 strategies for optimising the energy efficiency of the campus. In the 3-year follow-up project these will be implemented for a large proportion of the roughly 200 buildings on the campus (approx. 400,000 m² NFA). Parallel to this, a comprehensive monitoring and evaluation concept will be established.

Demonstration of how measures can be implemented in practice

The first focus area is on demonstrating how the measures can be implemented in practice. These encompass not only new construction, refurbishment and maintenance but also energy supplies, user motivation and information as well as urban development. The individual strategies will be coordinated in conjunction with one another but can be implemented independently. This will make it possible to respond flexibly to potential changes without compromising the overall goal in terms of its underlying principles.

Integrated technology research platform

Second research focus area: The special data availability at TU Braunschweig is being utilised to develop a “Real-Life-Lab Campus TUBS” technology research platform with interconnected technology research strategies for highly innovative integral developments. The research will focus on the following areas:

  • Users: Transparency of the energy consumption (signal analysis) through communicating the energy consumption to employees, staff and students
  • Building management: Automated monitoring of the system functions
  • Internet of Things: Intelligent system control.

Innerhalb der beiden Schwerpunktthemen findet ein kontinuierlicher Austausch hinsichtlich Entwicklung, Umsetzung und Erprobung innovativer Technologien statt.

Energy characteristics

before potential after unit
Total area with energy requirement 400.000,00    
Final energy requirement (electricity) 87,00     kWh/m²
Final energy requirement (heat) 96,00     kWh/m²
Primary energy requirement (electricity) 226,00     kWh/m²
Primary energy requirement (heat) 52,00     kWh/m²
Total primary energy requirement (heat + electricity) 278,00 167,00   kWh/m²
  • Project website (German)