scholarly journals A hybrid energy storage concept for future application in industrial processes

2018 ◽  
Vol 22 (5) ◽  
pp. 2235-2242 ◽  
Author(s):  
Sabrina Dusek ◽  
Rene Hofmann
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Storage Capacity ◽  
Electrical Heating ◽  
Industrial Processes ◽  
Future Application ◽  
Hybrid Storage ◽  
Steam Accumulator ◽  
Change Material ◽  
Storage Type

The efficiency of many industrial processes, applying steam as heat transfer medium, can be increased by integrating Ruths steam accumulator. This component makes it possible to store surplus steam for consumption at later time, whereby high loading and unloading rates can be realized with this storage type. For improving this storage type in terms of storage capacity and application range a hybrid storage approach is presented. The concept combines a Ruths steam storage with phase change material and electrical heating elements. For a first analysis of the interaction between the Ruths steam accumulator and the phase change material, which surrounds the steam storage vessel, a dynamic model was created. Also, an example which consist of a charging, storing, and discharging phase is presented. The simulation results show a positive impact in terms of storage capacity. Therefore, the hybrid storage concept is a promising approach for integration in industrial processes.

scholarly journals Design Optimization of a Hybrid Steam-PCM Thermal Energy Storage for Industrial Applications

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 898 ◽  
Author(s):  
René Hofmann ◽  
Sabrina Dusek ◽  
Stephan Gruber ◽  
Gerwin Drexler-Schmid
Keyword(s):  
Phase Change ◽  
Design Optimization ◽  
Phase Change Material ◽  
Storage Capacity ◽  
Storage System ◽  
Reaction Times ◽  
Industrial Applications ◽  
Limiting Factor ◽  
Hybrid Storage ◽  
Change Material

The efficiency of industrial processes can be increased by balancing steam production and consumption with a Ruths steam storage system. The capacity of this storage type depends strongly on the volume; therefore, a hybrid storage concept was developed, which combines a Ruths steam storage with phase change material. The high storage capacity of phase change material can be very advantageous, but the low thermal conductivity of this material is a limiting factor. On the contrary, Ruths steam storages have fast reaction times, meaning that the hybrid storage concept should make use of the advantages and compensate for the disadvantages of both storage types. To answer the question on whether this hybrid storage concept is economically feasible, a non-linear design optimization tool for a hybrid storage system is presented. From a preliminary approximation, the results show that the costs of hybrid storage can be reduced, in comparison to a Ruths steam storage with the same storage capacity. Furthermore, a possible hybrid storage design for a real industrial implementation is discussed. Based on further analyses, it was shown that under certain conditions, the retrofitting of a conventional Ruths steam storage to a hybrid storage can be advantageous and cost-effective, compared to an additional Ruths steam storage.

scholarly journals Catalyst-loaded micro-encapsulated phase change material for thermal control of exothermic reaction

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tatsuya Takahashi ◽  
Hiroaki Koide ◽  
Hiroki Sakai ◽  
Daisuke Ajito ◽  
Ade Kurniawan ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
High Speed ◽  
Storage Capacity ◽  
Heat Storage ◽  
Catalyst Support ◽  
Exothermic Reaction ◽  
Thermal Control ◽  
Ni Catalyst ◽  
Change Material

AbstractCO2 methanation is a promising technology to enable the use of CO2 as a resource. Thermal control of CO2 methanation, which is a highly active exothermic reaction, is important to avoid thermal runaway and subsequent degradation of the catalyst. Using the heat storage capacity of a phase change material (PCM) for thermal control of the reaction is a novel passive approach. In this study a novel structure was developed, wherein catalysts were directly loaded onto a micro-encapsulated PCM (MEPCM). The MEPCM was prepared in three steps consisting of a boehmite treatment, precipitation treatment, and heat oxidation treatment, and an impregnation process was adopted to prepare a Ni catalyst. The catalyst-loaded MEPCM did not show any breakage or deformation of the capsule or a decrease in the heat storage capacity after the impregnation treatment. MEPCM demonstrated a higher potential as an alternative catalyst support in CO2 methanation than the commercially available α-Al2O3 particle. In addition, the heat storage capacity of the catalyst-loaded MEPCM suppressed the temperature rise of the catalyst bed at a high heat absorption rate (2.5 MW m−3). In conclusion, the catalyst-loaded MEPCM is a high-speed, high-precision thermal control device because of its high-density energy storage and resolution of a spatial gap between the catalyst and cooling devices. This novel concept has the potential to overcome the technical challenges faced by efficiency enhancement of industrial chemical reactions.

Phasenwechselmaterialspeicher zur Lastflexibilisierung von Werkzeugmaschinen/Phase change material accumulator for energy flexibility of machine tools

2020 ◽  
Vol 110 (05) ◽  
pp. 346-353
Author(s):  
Mark Helfert ◽  
Adrian von Hayn ◽  
Jonas Wendt ◽  
Leon Dungs ◽  
Matthias Weigold
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Machine Tools ◽  
Production Management ◽  
Renewable Energy Sources ◽  
Industrial Processes ◽  
Energy Sources ◽  
Management Technology ◽  
Funded Project ◽  
Change Material

Im Rahmen des vom BMWi geförderten Projekts „Phi-Factory“ am Institut für Produktionsmanagement, Technologie und Werkzeugmaschinen (PTW) der Technischen Universität Darmstadt wurden, angesichts des steigenden Anteils fluktuierend einspeisender Stromerzeuger, technische Potenziale zur energetischen Flexibilisierung von Produktionsanlagen und Industrieprozessen untersucht. Im Bereich der Kühlung von Werkzeugmaschinen bietet der Einsatz von innovativen Phasenwechselmaterialspeichern die Möglichkeit, Lastflexibilisierung auf Maschinenebene umzusetzen, ohne den Fertigungsprozess zu beeinflussen. Zur experimentellen Untersuchung dieser Speicher wurde ein Demonstrator aufgebaut an dem ein parallel entwickelter „digitaler Zwilling“ validiert wurde.   Within the framework of the BMWi-funded project „Phi-Factory“ at the Institute for Production Management, Technology and Machine Tools (PTW) of the Technical University of Darmstadt, technical potentials for the energetic flexibilization of production plants and industrial processes were investigated in view of the increasing share of renewable energy sources. In the field of cooling of machine tools, the use of innovative phase-change material storage systems offers the possibility of implementing energy flexibility at machine level without influencing the production process. For the experimental investigation of these storages, a demonstrator was built on which a parallel developed „digital twin“ was validated.

Experimental Investigation on a PCM Based Thermal Energy Storage System for a VCR System

2021 ◽  
Vol 106 ◽  
pp. 116-120
Author(s):  
Shaik Riyaz Basha
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Cycle Time ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Food Storage ◽  
Change Material

Thermal energy storage (TES) based on hidden heat concept is good substitute for sensible heat storage because of its dense storage capacity and almost constant temperature heat transfers during the charging and discharging cycle. During no load and low cooling load conditions the system stores the thermal energy in the storage medium (phase change material) which will be used latter to meet the requirement in off cycle conditions. The intention of present work is to increase the system off cycle time, maintain required temperatures during power cuts by joining a few inch thick layer of phase change material on the outer surface of the evaporator. For investigation purpose a deep freezer which runs on vapor compression system of 50 liters storage capacity is fabricated with and without phase change materials. The eutectic compositions nearly 23 wt% salt (NaCl) dissolved in water and aluminium nitrate around 26 wt% dissolved in water are used as phase change materials. By the end of all experimental investigations it was noticed that the off cycle time system with phase change material is increased by 5.5 hours compared to system without phase change material, food storage time is enhanced by 8 to 14 hrs and a little power saving also achieved.

Performance Enhancement of a Refrigerator Using Phase Change Material-Based Condenser: An Experimental Investigation

2017 ◽  
Vol 25 (04) ◽  
pp. 1750032 ◽  
Author(s):  
Devendra Dandotiya ◽  
N. D. Banker
Keyword(s):  
Ambient Temperature ◽  
Phase Change ◽  
Phase Change Material ◽  
Storage Capacity ◽  
Performance Enhancement ◽  
Climatic Conditions ◽  
Latent Heat Storage ◽  
Condenser Temperature ◽  
Proposed Modification ◽  
Change Material

Tropical countries like India, the ambient temperature reaches to 45–50[Formula: see text]C in the summer and higher ambient temperature directly impacts the energy required by the household refrigerator. This paper presents an experimental performance of a domestic refrigerator incorporated with a phase change material (PCM)-based condenser in parallel to the conventional wire-and-tube air-cooled condenser for the climatic conditions of India. It is proposed to operate the refrigerator with the PCM-based condenser, while the ambient temperature is higher during the day, otherwise with the air-cooled condenser. Due to large latent heat storage capacity of the PCM, the condenser temperature would not increase significantly. The COP of the PCM-based condenser was 28% higher as compared to air cooled condenser for 60[Formula: see text]min which reduce to 3% as PCM temperature reached to 33[Formula: see text]C. The energy consumption is lower by [Formula: see text]% in [Formula: see text][Formula: see text]h of refrigerator experimentation with the proposed modification.

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