Explanipedia

Corrigendum: Design and performance optimization of a cascaded magnetocaloric heat pipe with enhanced cooling power and temperature difference (2025 J. Phys. Energy 7 045007) Open

Jan Schipper, Sabrina Unmüßig, Erol Kaya, Stefan Mönch, Jürgen Wöllenstein , et al. · 2025

Design and performance optimization of a cascaded magnetocaloric heat pipe with enhanced cooling power and temperature difference Open

Jan Schipper, Sabrina Unmüßig, Erol Kaya, Stefan Mönch, Juergen Woellenstein , et al. · 2025

Due to climate change, the need for efficient heat pumps is crucial. Magnetocaloric heat pumps are one of these potentially more efficient candidates. Magnetocaloric heat pumps use solid state refrigerants that exhibit a temperature change…

Direct Thermal Method to Characterize the Material Efficiency of Electrocaloric Lead Scandium Tantalate Multilayer Ceramic Capacitors Open

Sabrina Unmüßig, D. R. Bach, J. Metzdorf, Patrick Corhan, S. Hirose , et al. · 2025

In this study, we characterize electrocaloric lead scandium tantalate (PST) samples by means of the adiabatic temperature change ΔTad and the dissipative heat qdiss with a direct thermal method. The figure of merit (FOM), defined as the ra…

Calculation and Adjustment of the Activation Temperature of Switchable Heat Pipes Based on Adsorption Open

Christian Teicht, Markus Winkler, Simon Boda, Daniel Schwarz, Jan Schipper , et al. · 2024

Recently, thermal regulators based on adsorption in a heat pipe have been proposed. The advantage of these so-called “switchpipes” over similar approaches is their low on state thermal resistance. In this paper, we propose a methodology to…

Introduction of novel method of cyclic self-heating for the experimental quantification of the efficiency of caloric materials shown for LaFe11,4Mn0,35Si1,26Hx Open

Jan Schipper, Stefan Melchin, J. Metzdorf, D. R. Bach, Miriam Fehrenbach , et al. · 2024

Hysteresis and the associated production of dissipative heat during first order phase transitions are often major contributors to thermodynamic losses in caloric heat pumps. The figure of merit (FOM), defined as the ratio of adiabatic temp…

Highly Efficient Drive System for Elastocaloric Heat Pumps and Cooling Systems Open

Sabrina Unmüßig, Andreas Burghardt, Olaf Schäfer-Welsen, Kilian Bartholomé · 2024

The need for alternative cooling technologies aside from compressor based cooling is growing since more and more refrigerants get regulated. One promising technology is cooling with the elastocaloric effect by using a phase change of elast…

Improved Switchable Heat Pipe Based on Adsorption: Against-Gravity Operation and Enhanced Dynamics Open

Simon Boda, Markus Winkler, Robert Schießl, Christian Teicht, Daniel Schwarz , et al. · 2024

Controlling heat transfer through components with adjustable thermal resistance can be of great benefit in a wide range of applications such as the thermal management of spacecraft or electric vehicles. A novel concept for both thermal swi…

Electrocaloric cooling system utilizing latent heat transfer for high power density Open

J. Metzdorf, Patrick Corhan, D. R. Bach, S. Hirose, Dirk Lellinger , et al. · 2024

Flat-Plate PHP with Gravity-Independent Performance and High Maximum Thermal Load Open

Markus Winkler, Marc Vergez, Andreas Mahlke, Mathias Gebauer, Phillip Müller , et al. · 2023

In many energy-related applications, components with high heat loads, such as power electronics, play an important role. Pulsating heat pipes (PHPs) are an effective solution to deal with the increasing heat load of these components. In ma…

How highly efficient power electronics transfers high electrocaloric material performance to heat pump systems Open

Stefan Mönch, Richard Reiner, Patrick Waltereit, Michael Basler, R. Quay , et al. · 2023

Electrocaloric heat pumps for cooling or heating are an emerging emission-free technology, which could replace vapor-compression systems, harmful refrigerants, and mechanical compressors by a solid-state solution with theoretically even hi…

Electrocaloric cooling with latent heat transfer enabling high power density Open

Kilian Bartholomé, J. Metzdorf, Patrick Corhan, D. R. Bach, S. Hirose , et al. · 2023

Electrocalorics (EC) is potentially more efficient than refrigeration and heat pumps based on compressors and does not need detrimental fluids. Current EC-prototypes use solid-state contact or forced convection with liquids to transfer the…

Phenomenological Material Model for First-Order Electrocaloric Material Open

Sabrina Unmüßig, D. R. Bach, Youri Nouchokgwe, Emmanuel Defaÿ, Kilian Bartholomé · 2023

Caloric cooling systems are potentially more efficient than systems based on vapour compression. Electrocaloric cooling systems use a phase transformation from the paraelectric to the ferroelectric state by applying or removing an electric…

Spatio-temporal solid-state electrocaloric effect exceeding twice the adiabatic temperature change Open

Stefan Mönch, Kilian Bartholomé · 2023

In an all-solid-state electrocaloric arrangement, an absolute temperature change which exceeds twice the electrocaloric adiabatic temperature change is locally realized, using just the distributed thermal capacitances and resistances and s…

On the efficiency of caloric materials in direct comparison with exergetic grades of compressors Open

J. Schipper, D. R. Bach, Stefan Mönch, Christian Molin, W. Gebhardt , et al. · 2023

Efficiency improvements in heat pump can drastically reduce global energy demand. Caloric heat pumps are currently being investigated as a potentially more efficient alternative to vapor compression systems. Caloric heat pumps are driven b…

A 99.74% Efficient Capacitor-Charging Converter Using Partial Power Processing for Electrocalorics Open

Stefan Mönch, Richard Reiner, Kareem Mansour, Patrick Waltereit, Michael Basler , et al. · 2023

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P26 - Evaluation of Microheaters for Stationary Miniaturized PCR Thermocyclers Open

Passar Bamerni, Kilian Bartholomé, Jan König, Lee-Ann Mistry, Katrin Schmitt , et al. · 2023

Modeling of an Elastocaloric Cooling System for Determining Efficiency Open

Nora Bachmann, Daniel Schwarz, D. R. Bach, Olaf Schäfer-Welsen, Thomas Koch , et al. · 2022

When it comes to covering the growing demand for cooling power worldwide, elastocalorics offer an environmentally friendly alternative to compressor-based cooling technology. The absence of harmful and flammable coolants makes elastocalori…

Improved Thermal Switch Based on an Adsorption Material in a Heat Pipe Open

Markus Winkler, J. Schipper, Christian Teicht, Patrick Corhan, Angelos Polyzoidis , et al. · 2022

For many applications, the possibility of controlling heat flow by “thermal switching” can be very beneficial. In previous work, we presented a novel approach for thermal switching using a water-loaded adsorbent as part of the evaporator o…

Phenomenological model for first-order elastocaloric materials Open

Nora Bachmann, Andreas Fitger, Sabrina Unmüßig, D. R. Bach, Olaf Schäfer-Welsen , et al. · 2022

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Concept of a Magnetocaloric Generator with Latent Heat Transfer for the Conversion of Heat into Electricity Open

Puzant Baliozian, Patrick Corhan, Tobias Heß, Kilian Bartholomé, Jürgen Wöllenstein · 2022

Second‐order and first‐order magnetocaloric materials (MCMs) not experiencing hysteresis are characterized by a reversible temperature change when exposed to an applied magnetic field. Due to this property described by the magnetocaloric e…

Enhancing Electrocaloric Heat Pump Performance by Over 99% Efficient Power Converters and Offset Fields Open

Stefan Moench, Richard Reiner, Patrick Waltereit, Christian Molin, W. Gebhardt , et al. · 2022

This work analyzes how an over 99% efficient charging circuit and electrical offset fields enhance the coefficient of performance (COP) of electrocaloric heat pumps, an emerging technology with zero global warming potential. The COP…

Long-term stable compressive elastocaloric cooling system with latent heat transfer Open

Nora Bachmann, Andreas Fitger, Lena Maria Maier, Andreas Mahlke, Olaf Schäfer-Welsen , et al. · 2021

Thermal Switch Based on an Adsorption Material in a Heat Pipe Open

Markus Winkler, Christian Teicht, Patrick Corhan, Angelos Polyzoidis, Kilian Bartholomé , et al. · 2021

For many applications, the possibility of controlling heat flow by “thermal switching” could be very beneficial. Several concepts for heat switches were already proposed and tested, however, many drawbacks of these concepts are evident. In…

Active magnetocaloric heat pipes provide enhanced specific power of caloric refrigeration Open

Lena Maria Maier, Patrick Corhan, Alexander Barcza, Hugo A. Vieyra, Christian Vogel , et al. · 2020

Method to characterize a thermal diode in saturated steam atmosphere Open

Lena Maria Maier, Tobias Heß, A. Kaube, Patrick Corhan, Andreas Fitger , et al. · 2020

We present a novel measurement method for the characterization of thermal diodes in a saturated steam atmosphere. A measuring setup has been developed in which two pressure sensors are integrated. Using a developed analytical model, the he…

Small-Sized Pulsating Heat Pipes/Oscillating Heat Pipes with Low Thermal Resistance and High Heat Transport Capability Open

Markus Winkler, David Rapp, Andreas Mahlke, Felix Zunftmeister, Marc Vergez , et al. · 2020

Electronics (particularly power electronics) are the core element in many energy-related applications. Due to the increasing power density of electronic parts, the demands on thermal management solutions have risen considerably. As a novel…

Thermal hysteresis and its impact on the efficiency of first-order caloric materials Open

Tobias Heß, Lena Maria Maier, Nora Bachmann, Patrick Corhan, Olaf Schäfer-Welsen , et al. · 2020

Cooling with caloric materials could be an option to replace compressor-based cooling systems in the future. In addition to the advantage of avoiding dangerous liquid coolants, one often cites a possible higher efficiency of the calorific …

New concept for magnetocaloric heat pumps based on thermal diodes and latent heat transfer. Open

Kilian Bartholomé, Tobias Heß, Andreas Mahlke · 2016

Since the beginning of the last decade, several dozens of magnetocaloric heat pump systems have been built by different groups. Basically all of these systems are based on the Active Magnetic Regenerator (AMR) concept, where a heat transfe…

Spectrum splitting for efficient utilization of solar radiation: a novel photovoltaic–thermoelectric power generation system Open

Esam Elsarrag, Hans F. Pernau, Jana Heuer, Nibul Roshan, Yousef Alhorr , et al. · 2015

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