Bormann, Benno

Diploma Thesis:
1983

Topic:
Economic evaluation of renewable energy concepts in buildings

Editor:
Benno Bormann

University Professor Responsible:
Univ.-Prof. Dr.-Ing. Dipl.-Wirt.-Ing. Jens Otto

Supervisor:
University Supervisor: Dipl.-Ing. Romy Wiel

Editing Period:
03.05.2024 until 06.09.2024

Abstract:
This thesis analyses the economic evaluation of renewable energy concepts in buildings against the background of climate protection targets and the energy transition in Germany. The aim is to evaluate various renewable energy concepts for new buildings in terms of their economic viability and to provide a basis for decisions on technical building equipment. The focus is on detached houses and apartment blocks.
The work begins with a presentation of the technical principles of various renewable energy technologies such as heat pumps, photovoltaics and solar thermal energy. The methodological principles for the creation and economic evaluation of energy concepts are then explained. Energy balances are drawn up for the selected concepts in accordance with DIN V 18599 and a profitability analysis is carried out using the annuity method over an observation period of 20 years. A scenario analysis with four scenarios is carried out to analyse the risks.
The evaluation of the results shows that the economic viability of the energy concepts is largely determined by the investment costs. In the single-family house analysed, concepts with air-to-air heat pumps are the most cost-effective, followed by water-to-water heat pumps with groundwater as the heat source. In apartment blocks, water-to-water heat pumps are the most economical. Photovoltaic systems generally improve economic efficiency, while battery storage systems do not lead to any significant improvement under the current framework conditions. Wind turbines and fuel cells prove to be significantly less economical than the other concepts.
The work concludes with specific recommendations for planners and building owners on the selection of renewable energy concepts for new buildings.