Integration of Flow Temperatures in Unit Commitment Models of Future District Heating Systems
| Autor: | Simon Hilpert, Ilja Tuschy, Cord Kaldemeyer, Cynthia Boysen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Control and Optimization
Combined cycle 020209 energy Energy Engineering and Power Technology 02 engineering and technology Technology assessment Combustion lcsh:Technology law.invention Power system simulation 020401 chemical engineering law Steam turbine 0202 electrical engineering electronic engineering information engineering supply temperature 0204 chemical engineering Electrical and Electronic Engineering Process engineering unit commitment Engineering (miscellaneous) district heating systems Renewable Energy Sustainability and the Environment business.industry Back pressure lcsh:T low temperature levels Heating system Environmental science mixed-integer linear programming business Constant (mathematics) Energy (miscellaneous) |
| Zdroj: | Energies Volume 12 Issue 6 Energies, Vol 12, Iss 6, p 1061 (2019) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en12061061 |
| Popis: | The transformation of heat supply structures towards 4th generation district heating (4GDH) involves lower supply temperatures and a shift in technology. In order to assess the economic viability of the respective systems, adequate unit commitment models are needed. However, maintaining the formal requirements, while reducing the computational efforts of these models, often includes simplifications such as the assumption of constant supply temperatures. This study investigates the effect of introducing varying supply temperatures in mixed-integer linear programming models. Based on a case study of a municipal district heating system, how the temperature integration approach affects unit commitment and technology assessment for different temperature levels and scenarios is analyzed. In particular, three supply temperature levels are investigated with both variable and constant temperatures in two scenarios. Results indicate that lower flow temperature levels in the heating network tend to favor internal combustion engines, combined cycle power plants, and heat pumps while back pressure steam turbines, peak loads, and electric boilers show declining operating hours. Furthermore, the effect of varying versus constant temperatures at the same temperature level is rather small, at least as long as technical restrictions do not come into play. Finally, it is found that the effect of changing temperature on a technology assessment is comparably small as opposed to adaptions in the regulatory framework. |
| Databáze: | OpenAIRE |
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