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Coupled Simulation of Borehole Thermal Energy Storages and Solar District Heating Systems

Formhals, J. and Schulte, D. O. and Welsch, B. and Sass, I. :
Coupled Simulation of Borehole Thermal Energy Storages and Solar District Heating Systems.
In: European Geosciences Union General Assembly 2017, 23.-28.4.2017, Vienna.
[Conference or Workshop Item] , (2017)

Abstract

The temporal difference between times of high heat demands and times of high solar heat supplies can be compensated by solar district heating (SDH) with borehole thermal energy storage (BTES) systems. To achieve a good understanding of the system behavior and for optimized dimensioning of the components transient simulations are imperative. In this context the models of SDH systems and BTES pose very different requirements on their simulation environments. Taking this into account, a coupled simulation, in which both models can be realized in separate and specialized simulation environments becomes favorable. The underlying work presents a new approach for a coupled simulation of a SDH system modelled in SimulationX and a BTES system modelled in MATLAB. A case study is performed, in which a SDH system with an annual heat demand of 1,100 MWh and a BTES is designed and dimensioned. The SDH is modelled in SimulationX and later coupled to an existing model of a BTES in MATLAB. Subsequently, a simulation over seven years is carried out to assess the performance of the designed system and the presented coupling method. For the designed system, a storage efficiency of 56.6% and a solar fraction of 36.6% can be achieved after the final year. The implementation of a heat pump proves to be beneficial for the performance of the system. A detailed analysis of the system and component behavior is performed, which concludes in a good understanding of interdependencies between the components and the identification of potential improvements. Following this, an improvement strategy for the system is developed, in which major potentials are related to a more sophisticated control strategy.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Formhals, J. and Schulte, D. O. and Welsch, B. and Sass, I.
Title: Coupled Simulation of Borehole Thermal Energy Storages and Solar District Heating Systems
Language: English
Abstract:

The temporal difference between times of high heat demands and times of high solar heat supplies can be compensated by solar district heating (SDH) with borehole thermal energy storage (BTES) systems. To achieve a good understanding of the system behavior and for optimized dimensioning of the components transient simulations are imperative. In this context the models of SDH systems and BTES pose very different requirements on their simulation environments. Taking this into account, a coupled simulation, in which both models can be realized in separate and specialized simulation environments becomes favorable. The underlying work presents a new approach for a coupled simulation of a SDH system modelled in SimulationX and a BTES system modelled in MATLAB. A case study is performed, in which a SDH system with an annual heat demand of 1,100 MWh and a BTES is designed and dimensioned. The SDH is modelled in SimulationX and later coupled to an existing model of a BTES in MATLAB. Subsequently, a simulation over seven years is carried out to assess the performance of the designed system and the presented coupling method. For the designed system, a storage efficiency of 56.6% and a solar fraction of 36.6% can be achieved after the final year. The implementation of a heat pump proves to be beneficial for the performance of the system. A detailed analysis of the system and component behavior is performed, which concludes in a good understanding of interdependencies between the components and the identification of potential improvements. Following this, an improvement strategy for the system is developed, in which major potentials are related to a more sophisticated control strategy.

Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Exzellenzinitiative > Graduate Schools > Graduate School of Energy Science and Engineering (ESE)
11 Department of Materials and Earth Sciences > Earth Science
Exzellenzinitiative > Graduate Schools
11 Department of Materials and Earth Sciences
Exzellenzinitiative
Event Title: European Geosciences Union General Assembly 2017
Event Location: Vienna
Event Dates: 23.-28.4.2017
Date Deposited: 05 May 2017 08:52
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