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Daniel Scharrer
Lab of Computer Networks and Communication Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany

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Journal article
Published: 27 June 2021 in Energies
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Pumped Thermal Energy Storages (PTES) are suitable for bridging temporary energy shortages, which may occur due to the utilization of renewable energy sources. A combined heat pump (HP)-Organic Rankine Cycle (ORC) system with suitable thermal storage offers a favorable way to store energy for small to medium sized applications. To address the aspect of flexibility, the part load behavior of a combined HP-ORC system, both having R1233zd(E) (Trans-1-chloro-3,3,3-trifluoropropene) as working fluid and being connected through a water filled sensible thermal energy storage, is investigated using a MATLAB code with integration of the fluid database REFPROP. The influence on the isentropic efficiency of the working machines and therefore the power to power efficiency (P2P) of the complete system is shown by variation of the mass flow and a temperature drop in the thermal storage. Further machine-specific parameters such as volumetric efficiency and internal leakage efficiency are also considered. The results show the performance characteristics of the PTES as a function of the load. While the drop in storage temperature has only slight effects on the P2P efficiency, the reduction in mass flow contributes to the biggest decrease in the efficiency. Furthermore, a simulation for dynamic load analysis of a small energy grid in a settlement is conducted to show the course of energy demand, supplied energy by photovoltaic (PV) systems, as well as the PTES performance indicators throughout an entire year. It is shown that the use of PTES is particularly useful in the period between winter and summer time, when demand and supplied photovoltaic energy are approximately equal.

ACS Style

Bernd Eppinger; Mustafa Muradi; Daniel Scharrer; Lars Zigan; Peter Bazan; Reinhard German; Stefan Will. Simulation of the Part Load Behavior of Combined Heat Pump-Organic Rankine Cycle Systems. Energies 2021, 14, 3870 .

AMA Style

Bernd Eppinger, Mustafa Muradi, Daniel Scharrer, Lars Zigan, Peter Bazan, Reinhard German, Stefan Will. Simulation of the Part Load Behavior of Combined Heat Pump-Organic Rankine Cycle Systems. Energies. 2021; 14 (13):3870.

Chicago/Turabian Style

Bernd Eppinger; Mustafa Muradi; Daniel Scharrer; Lars Zigan; Peter Bazan; Reinhard German; Stefan Will. 2021. "Simulation of the Part Load Behavior of Combined Heat Pump-Organic Rankine Cycle Systems." Energies 14, no. 13: 3870.

Journal article
Published: 23 June 2020 in Energies
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The life cycle assessment of components is becoming increasingly important for planning and construction. In this paper, a novel storage technology for excess electricity consisting of a heat pump, a heat storage and an organic rankine cycle is investigated with regards to its environmental impact. Waste heat is exergetically upgraded, stored in a hot water storage unit and afterwards reconverted to electricity when needed. Such a pilot plant on a lab scale is currently built in Germany. The first part of this paper focuses on geothermal energy as a potential heat source for the storage system and its environmental impact. For a large scale application, geothermal hotspots in Germany are further investigated. The second part analyzes the storage technology itself and compares it to the impacts of commonly used battery storage technologies. Especially during the manufacturing process, significantly better global warming potential values are shown compared to lithium-ion and lead batteries. The least environmental impact while operating the system is with wind power, which suggests an implementation of the storage system into the grid in the northern part of Germany.

ACS Style

Daniel Scharrer; Bernd Eppinger; Pascal Schmitt; Johan Zenk; Peter Bazan; Jürgen Karl; Stefan Will; Marco Pruckner; Reinhard German. Life Cycle Assessment of a Reversible Heat Pump – Organic Rankine Cycle – Heat Storage System with Geothermal Heat Supply. Energies 2020, 13, 3253 .

AMA Style

Daniel Scharrer, Bernd Eppinger, Pascal Schmitt, Johan Zenk, Peter Bazan, Jürgen Karl, Stefan Will, Marco Pruckner, Reinhard German. Life Cycle Assessment of a Reversible Heat Pump – Organic Rankine Cycle – Heat Storage System with Geothermal Heat Supply. Energies. 2020; 13 (12):3253.

Chicago/Turabian Style

Daniel Scharrer; Bernd Eppinger; Pascal Schmitt; Johan Zenk; Peter Bazan; Jürgen Karl; Stefan Will; Marco Pruckner; Reinhard German. 2020. "Life Cycle Assessment of a Reversible Heat Pump – Organic Rankine Cycle – Heat Storage System with Geothermal Heat Supply." Energies 13, no. 12: 3253.

Journal article
Published: 25 May 2018 in Energies
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Storage of electricity from fluctuating renewable energy sources has become one of the predominant challenges in future energy systems. A novel system comprises the combination of a heat pump and an Organic Rankine Cycle (ORC) with a simple hot water storage tank. The heat pump upgrades low temperature heat with excess power. The upgraded heat can drive an Organic Rankine Process using the heat pump in reverse operation mode. This approach allows a comparably efficient storage of excess electricity. Waste heat sources usually do not qualify for electricity production even with ORC processes due to low temperatures. Upgrading the temperature of the waste heat by means of excess electricity makes the use of an ORC feasible in order to recover the electricity input. Thermodynamic cycle simulations with IPSEpro software outline that the process provides power-to-power efficiencies in a range of 50% for small-scale applications based on commercially available heat pump components. The isentropic efficiency of compressors/expanders plays a crucial role on the system performance. Applications of the proposed cycle in the megawatt range with more efficient turbines and dynamic compressors will therefore increase the power-to-power efficiency to above 70%.

ACS Style

Sebastian Staub; Peter Bazan; Konstantinos Braimakis; Dominik Müller; Christoph Regensburger; Daniel Scharrer; Bernd Schmitt; Daniel Steger; Reinhard German; Sotirios Karellas; Marco Pruckner; Eberhard Schlücker; Stefan Will; Jürgen Karl. Reversible Heat Pump–Organic Rankine Cycle Systems for the Storage of Renewable Electricity. Energies 2018, 11, 1352 .

AMA Style

Sebastian Staub, Peter Bazan, Konstantinos Braimakis, Dominik Müller, Christoph Regensburger, Daniel Scharrer, Bernd Schmitt, Daniel Steger, Reinhard German, Sotirios Karellas, Marco Pruckner, Eberhard Schlücker, Stefan Will, Jürgen Karl. Reversible Heat Pump–Organic Rankine Cycle Systems for the Storage of Renewable Electricity. Energies. 2018; 11 (6):1352.

Chicago/Turabian Style

Sebastian Staub; Peter Bazan; Konstantinos Braimakis; Dominik Müller; Christoph Regensburger; Daniel Scharrer; Bernd Schmitt; Daniel Steger; Reinhard German; Sotirios Karellas; Marco Pruckner; Eberhard Schlücker; Stefan Will; Jürgen Karl. 2018. "Reversible Heat Pump–Organic Rankine Cycle Systems for the Storage of Renewable Electricity." Energies 11, no. 6: 1352.