Climate-neutral and sustainable campus Leuphana University of Lueneburg

Climate-neutral and sustainable campus Leuphana University of Lueneburg

The Leuphana University of Lueneburg changed to renewable energy supply with the first climate-neutral energy balance for heat, electricity, cars and business trips in 2014. The heating network is based on two biomethane-powered combined-heat-and-power (CHP) units of 525 kWel. each. A total of 720 k...

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Bibliographic Details
Published in:Energy (Oxford) Vol. 141; pp. 2628 - 2639
Main Authors: Opel, O., Strodel, N., Werner, K.F., Geffken, J., Tribel, A., Ruck, W.K.L.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 15-12-2017
Elsevier BV
Subjects:
Aquifers
Biogas
Carbon dioxide
Climate
Climate-neutrality
Cogeneration
College campuses
Efficient buildings
Electricity
Energy balance
Energy conversion efficiency
Energy efficiency
Energy storage
Exergy
Exhibitions
Heat storage
Heating
HT-ATES
HVAC
Integration
Low-exergy
Photovoltaic cells
Photovoltaics
Power efficiency
Renewable energy
Solar cells
Sustainable design
Thermal energy
Luneburg Germany
Germany
Climate-neutrality
Low-exergy
HT-ATES
Cogeneration
Heat storage
Efficient buildings
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Summary:The Leuphana University of Lueneburg changed to renewable energy supply with the first climate-neutral energy balance for heat, electricity, cars and business trips in 2014. The heating network is based on two biomethane-powered combined-heat-and-power (CHP) units of 525 kWel. each. A total of 720 kWp photovoltaics with 95% self-consumption covers > 20% of the electrical demand. We present the campus development and transformation to provide a best-practice example for conversion to exergy-efficient renewable energy systems. The new central building provides a large auditorium, seminar rooms, offices, a cafeteria, machine hall and space for exhibitions and events. It uses low-grade heat at 58 °C for optimized integration of short and long term heat storage installations. The architecture and façade design significantly lower cooling demand (≈ 2.5 kWh/m2a), modern lighting systems and user integration allow for superior overall energy efficiency. Exergy efficiency, storage options and emissions of the campus system as well as energy efficiency of the buildings were analysed. A high-temperature aquifer thermal energy storage (HT-ATES) installation perfectly matches the low-exergy heating demands and increases the share of CHP-heat, resulting in an additional surplus of 2.3 GWh/a of renewable electricity and additional savings of 2.424 t CO2-eq./a. •The University changes focus and organizational structures to implement sustainability.•Energy efficiency measures have been taken and the supply switched to renewables.•Exergy efficiency and emissions of the campus system have been analysed.•A low-exergy, efficient building matches a large seasonal heat storage.•Climate-neutrality is achieved including external effects.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2017.08.039