Data-driven design of carbon-based materials for high-performance flexible energy storage devices
In particular, the FSC device can maintain good energy storage ability under extreme operating conditions such as puncture, cut, and water immersion. The reason for this remarkable safety is that the unique 3D network structure and the N-doped content of 3DC-NE can effectively adsorb and store the highly stable ionic liquid, thus ensuring the
Nanofluid filled enclosures: potential photo-thermal energy conversion and sensible heat storage devices
Detailed analysis reveals that under similar operating conditions, in volumetric absorption mode (i.e., at low nanoparticles volume fraction) nanofluid filled enclosure has higher sensible heat storage (8%–20% higher) and thermal discharging (13%–58% higher
Recent Development of Carbon-Nanotube-Based Solar Heat Absorption Devices
In this review study, we evaluated CNT-based water purification, thermoelectric generation, and water heating systems under varying solar levels of illumination, ranging from domestic applications to industrial usage. The use of CNT composites or multilayered structures is also reviewed in relation to solar heat absorber
Advances in thermal energy storage: Fundamentals and
Thermal energy storage (TES) systems store heat or cold for later use and are classified into sensible heat storage, latent heat storage, and thermochemical heat
An investigation of the solar powered absorption refrigeration system with advanced energy storage
Nomenclature A circulation area of the solar collector (m 2) c p specific heat of working fluid (kJ kg −1 K −1) d i inner diameter of the pipe in solar collector (m) E energy (kW h or MJ) g gravity acceleration (m s −2) h specific enthalpy (kJ kg −1) or height (m) I
Performance of a solid state hydrogen storage device with finned tube heat
Absorption performance of the storage device is investigated at constant hydrogen supply pressure of 15 bar and cooling fluid temperature and velocity of 298 K and 1 m/s respectively. At these operating conditions, the required charging time is found to be around 610 s for a storage capacity of 12 g (1.2 wt%).
Optimizing heat-absorption efficiency of phase change materials
This contribution can make a difference in PCM-based cooling devices, heat absorption and release of the energy storage system, and energy output equipment, etc. Therefore, constructing energy transfer network mimicking natural structures is not a stunt but a rigorous and effective tool to make more progress.
Effects of heat exchanger design on the performance of a solid state hydrogen storage device
The objectives of this work is to study experimentally and theoretically the hydrogen absorption process in a solid state hydrogen storage device with an embedded heat exchanger of novel design. The effects of different geometric parameters of the fins and various operating conditions on absorption performance were investigated
Current status of thermodynamic electricity storage: Principle, structure, storage device
As an efficient energy storage method, thermodynamic electricity storage includes compressed air energy storage (CAES), compressed CO 2 energy storage (CCES) and pumped thermal energy storage (PTES). At present, these three thermodynamic electricity storage technologies have been widely investigated and play
Optically-controlled long-term storage and release of thermal
Visible-light illumination rapidly switches the dopants and allows the PCM composite to crystallize and release the stored latent heat on-demand, recovering the
Progress in the Study of Enhanced Heat Exchange in Phase Change Heat Storage Devices
In comparison with sensible heat storage devices, phase change thermal storage devices have advantages such as high heat storage density, low heat dissipation loss, and good cyclic performance, which have great potential for solving the problem of temporal and spatial imbalances in the transfer and utilization of heat energy. However, there are also
Finite time thermodynamic optimization for performance of absorption energy storage
The AES can convert the thermal energy to the chemical potential energy in the different concentration solution or/and vapor, which has the advantage of the high ESD, small heat loss, long storage time, low-grade energy using and friendly to the environment, etc.
Nanomaterials | Free Full-Text | Recent Development of Carbon-Nanotube-Based Solar Heat Absorption Devices
Population growth and the current global weather patterns have heightened the need to optimize solar energy harvesting. Solar-powered water filtration, electricity generation, and water heating have gradually multiplied as viable sources of fresh water and power generation, especially for isolated places without access to water and energy. The
Parametric optimization of coupled fin-metal foam metal hydride bed towards enhanced hydrogen absorption performance of
Thus, there exists a trade-off between the decrease of hydrogen storage capacity and heat transfer enhancement by increasing VFHM. Performance of a solid state hydrogen storage device with finned tube heat exchanger Int
Absorption-type chemical energy storage device containing
The invention discloses an absorption-type chemical energy storage device containing crystals. The device comprises a generator, an absorber, an evaporator, a condenser, a throttle valve, a solution pump, a concentrated solution storage tank, a dilute solution
Fin structure optimization for improving heat transfer efficiency and hydrogen absorption rate of metal hydride hydrogen storage
In this work, various heat exchange fins combined with inner heat exchange tube and outer water jacket were employed to improve the heat transfer properties of metal hydride hydrogen storage device. Particularly, the innovations of fin shapes and fin distributions in this work have leaded to improved heat transfer performances of metal
Heat transfer
A hot, less-dense lower boundary layer sends plumes of hot material upwards, and cold material from the top moves downwards. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy ( heat) between physical systems. Heat transfer is classified into various mechanisms
Performance analysis of a solar single-effect absorption/compression hybrid refrigeration system with integrated absorption energy storage
Rizza [19] studied a LiBr-H 2 O absorption refrigeration system with integrated absorption energy storage, a heat pump series with generator as the heat source, the charging temperature was 82 C, resulting in a reduction in COP.
A novel modified LiCl solution for three-phase absorption thermal energy storage
Absorption thermal energy storage (TES) is gaining increasing attention due to its large energy storage density (ESD), mobility and long-term thermal storage capability. Expanding the working concentration difference of a solution can significantly enhance its ESD; however, this may result in crystallization, influencing fluidity and
Advances in thermal energy storage: Fundamentals and
Thermal energy storage (TES) is increasingly important due to the demand-supply challenge caused by the intermittency of renewable energy and waste heat dissipation to the environment. This paper discusses the fundamentals and novel applications of TES materials and identifies appropriate TES materials for particular
Type II absorption thermal battery for temperature upgrading: Energy storage heat
The type II absorption heat pump is known as an absorption heat transformer for temperature upgrading [52], but it cannot achieve energy storage. Although a recent study used a hybrid compression-adsorption cycle to realize energy storage and heat transforming [53], there is no research on ATBs for simultaneous energy storage
Experiments on solid state hydrogen storage device with a finned tube heat
The absorption and desorption performances of a solid state (metal hydride) hydrogen storage device with a finned tube heat exchanger are experimentally investigated. The heat exchanger design consists of two "U" shaped cooling tubes and perforated annular copper fins. Copper flakes are also inserted in between the fins to
Finite time thermodynamic optimization for performance of absorption energy storage
Absorption energy storage (AES) has attracted worldwide attention due to the high energy storage density and environmental friendliness. To optimize the performance of the AES system, a finite time thermodynamic (FTT) model considering some influencing factors such as time, heat transfer area, heat transfer temperature difference,
Performance study and heating simulation on novel latent heat thermal energy storage device suit for air source heat
Latent heat thermal energy storage (LHTES) is a major aspect of heat storage, owing to phase change material (PCM) being advantageous with large heat storage, release density, and capacity [8]. The LHTES technology has been widely studied in the coupled application with solar thermal/electric systems [9], [10], [11] and heat
Energy and Mass Matching Characteristics of the Heat-Absorbing
The heat released can heat water to generate superheated steam, drive the Rankine cycle of steam, and generate electric energy. The synthesis and dissociation systems can
Progress in the Study of Enhanced Heat Exchange in Phase Change Heat Storage Devices
HTF Parameters Melting time 10−18.5% Nanoparticles. The results demonstrated a reduction in melting time by 69.52% and 53.17% for foam metal and nanoparticle packaging, respectively, compared to that of pure PCM packaging, leading to a significant improvement in heat storage and discharge eficiency.
Review of the heat transfer enhancement for phase change heat storage devices
The heat is converted into internal energy and stored. The heat storage density is about 8–10 times that of sensible heat storage and 2 times that of phase change heat storage. The device is difficult to design because the reaction temperature is usually high [ 9 ]. The research is still in the laboratory stage.
Experimental investigation on charging and discharging performance of absorption thermal energy storage
Absorption thermal energy storage has the characteristics of high thermal energy storage density and low heat loss in long-term storage. In this paper, an absorption heat pump thermal energy storage system with CaCl 2 -water solution as the working fluid is proposed for solving the problem of insufficient wind power
Energy and Mass Matching Characteristics of the Heat-Absorbing Side of the Ammonia Energy Storage System under Nonuniform Energy
Ammonia thermochemical energy storage is based on a reversible reaction and realizes energy storage and utilization by absorbing and releasing heat. Under different energy flow densities, the efficiency of an ammonia reactor composed of multiple ammonia reaction tubes is different. Based on the coupling model of light, heat, and chemical energy of an
Investigation of a 10 kWh sorption heat storage device for effective utilization of low-grade thermal energy
The heat storage capacity is 34504 kJ (9.58 kWh), in which sorption heat accounts for 20702 kJ (approximately 60%) and sensible heat accounts for 13802 kJ. (2) The ESD m can reach 815 Wh/kg (2936.5 kJ/kg), taking into account the sensible heat storageOtherwise, the ESD m is 489 Wh/kg (1761.9 kJ/kg)
Thermal energy storage using absorption cycle and system: A
Abstract. Due to the high energy storage density and long-term storage capability, absorption thermal energy storage is attractive for the utilization of solar energy, waste heat, off-peak electricity, and etc. In recent years, absorption thermal energy storage has been intensively studied from thermodynamic cycles, working pairs,
Thermal storage performance of latent heat thermal energy storage device
In this research, the latent heat thermal energy storage device with helical fin is proposed and its thermal storage performance is also investigated by numerical simulation. First, assorted helix pitches (400 mm, 200 mm, 100 mm and 50 mm) and fin numbers are taken into account to investigate the thermal storage performance with
Phase change material-based thermal energy storage
Melting and solidification have been studied for centuries, forming the cornerstones of PCM thermal storage for peak load shifting and temperature stabilization. Figure 1 A shows a conceptual phase diagram of ice-water phase change. At the melting temperature T m, a large amount of thermal energy is stored by latent heat ΔH due to
Exergoeconomic analysis and optimization of wind power hybrid energy storage
studied the feasibility and economic benefits of large-scale energy storage devices participating in the network flow distribution in absorption heat exchanger. Energy 147, 428 (2018). Article
Electrical circuit analogy for analysis and optimization of absorption energy storage
Wilbur et al. [4], [5] analyzed a solar air-conditioning system with an absorption energy storage facility and suggested setting up a reservoir as a buffer device to lower the temperature of driving heat source,
Parametric optimization of coupled fin-metal foam metal hydride bed towards enhanced hydrogen absorption performance of
The bed temperature becomes very high during the early stage of hydrogen absorption [20], which limits the heat transfer. Therefore, the heat transfer rate in metal foam reactor also needs to be enhanced to
Development of sorption thermal battery for low-grade waste heat recovery and combined cold and heat energy storage
Sorption thermal battery was proposed for combined cold and heat energy storage. • Energy and power densities of sorption thermal battery were studied experimentally. • Energy densities of different sorption working pairs were compared and analyzed. • Heat
(PDF) Review on absorption thermal energy storage
Thermochemical heat storage is a promising approach for thermal energy storage that allows high energy density and long-term storage at ambient temperature. This type of
Prof. Wei WU | School of Energy and Environment
He joined the City University of Hong Kong as an assistant professor in the School of Energy and Environment in July 2018. Prof. Wu''s research is focused on building energy and sustainability technologies (BEST) towards carbon neutrality, including advanced heat pumps, novel working fluids, thermal energy storage, advanced thermal management
Delivery and utilization of photo-energy for temperature control using a light-driven microfluidic control device
The introduction of flexible chains into azobenzene molecules is used to change azobenzene-based PCMs; however, few studies have combined low-temperature heat absorption/release and high-energy storage. 27, 30 Owing to the weak intermolecularcistrans
Thermal storage performance of latent heat thermal energy
Latent heat thermal energy storage has garnered increasing interest and development as a significant technique for recovering waste heat. In this research, the
Advanced/hybrid thermal energy storage technology: material,
Thermal energy storage (TES) technology is playing an increasingly important role in addressing the energy crisis and environmental problems. Various TES technologies, including sensible-heat TES, latent-heat TES, and thermochemical TES, have been intensively
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