Showing papers on "Thermal energy published in 2022"
TL;DR: In this article, the authors summarized the latest progress of thermoelectric materials and devices and discussed multiple strategies for improving the performance of TE materials via regulating carriers and phonons.
75 citations
01 Jan 2022
TL;DR: In this article , three different PVT-air collectors have been designed, manufactured and experimentally analyzed including conventional (PVT), with paraffin-based thermal energy storage unit (TES) and with nano-enhanced Paraffinbased Thermal Energy Storing Unit (PTES) with copper oxide nanoparticles (1 wt%) to upgrade the thermal conductivity of the phase change material.
Abstract: Electrical and thermal energy can be generated simultaneously by using photovoltaic-thermal (PVT) systems. Also, electrical efficiency can be enhanced by cooling the PV panel. In this study, three different PVT-air collectors have been designed, manufactured and experimentally analyzed including conventional (PVT), with paraffin-based thermal energy storage unit (PVT-TES) and with nano-enhanced paraffin-based thermal energy storage unit (PVT-NeTES). Copper oxide (CuO) nanoparticles (1 wt%) have been utilized to upgrade the thermal conductivity of the phase change material. Tests have been performed in two flow rates (0.007 and 0.014 kg/s). According to experimental results, overall exergy efficiencies for PVT, PVT-TES and PVT-NeTES were achieved between 10.52–13.59%, 11.08–14.36% and 12.52–15.44%, respectively. Moreover, sustainability index (SI) values were attained in the range of 1.12–1.16, 1.13–1.17 and 1.14–1.18, respectively. Obtained findings showed that utilizing nano-enhanced thermal energy storage system and increasing flow rate significantly upgraded both electrical and thermal performances of the PVT system.
38 citations
TL;DR: In this paper, phase change materials (PCMs) have received substantial interest for their ability to store and release latent heat for energy conservation and thermal control purposes, which is broadly discussed in this manuscript.
35 citations
35 citations
TL;DR: In this article, a comprehensive update on status and challenges of adsorption refrigeration is provided with an objective to include experimental as well as theoretical research work reported thus far, with an expectation to provide beginners a quick review in the area of ad-sorption cooling technology.
Abstract: Adsorption refrigeration technology is being increasingly investigated over the past few decades as a sustainable technology option for meeting the fast-growing cooling needs for refrigeration and air-conditioning. What is attractive about adsorption technology is the opportunity to use low grade thermal energy such as solar heat and industrial waste heat. The present study is an attempt to provide readers a comprehensive update on status and challenges of adsorption refrigeration. The effects of working parameters like evaporator temperature, condenser temperature, regeneration temperature, cycle time, and inter-stage pressure on coefficient of performance and specific cooling power are covered with an objective to include experimental as well as theoretical research work reported thus far. Research work consolidated in this study includes the integrated cycles of adsorption cooling, adsorber design with extended surfaces, multi-stage and/or multi-bed scheme, and heat and/or mass recovery scheme either in combination or individually for thermal performance enhancement. Furthermore, work on a state of the art of various commercially available adsorption chillers highlighting their cooling capacity, working temperature range, novelties, and applications are reported in detail. This review also reveals an opportunity for research in optimizing the mechanism, design, orientation of the heat exchangers, functioning, and customizing the vapour adsorption refrigeration system for widespread applications in various sectors like automobiles and agriculture. Authors present this study with an expectation to provide beginners a quick review in the area of adsorption cooling technology.
32 citations
TL;DR: In this article, a three-dimensional network structural aerogel is used as a supporting matrix for Stearic acid (SA) to support solar thermal energy harvesting and storage.
30 citations
TL;DR: In this paper, the thermal energy storage characteristics of a packed bed thermal storage device (PBTESD) filled with spherical phase change capsules are analyzed, and the effects of Reynolds number, Stefan number, dimensionless diameter and effective thermal conductivity of phase change material (PCM) on the temperature evolution trend and thermal performance of PBTESDs were investigated by single factor analysis.
30 citations
TL;DR: In this article, a thermal energy storage system based on SiO2 nanoparticles decorated LiNO3/NaCl eutectics inlaid in three-dimensional (3D) hierarchical ultralight silicon carbide (SiC) foams is proposed.
29 citations
TL;DR: In this paper, a 5th generation bidirectional heating/cooling network is designed and modelled, coupled with water-to-water heat pumps, ground heat pumps and a photovoltaic field and is designed to meet the energy requirements of a 50-building district in the city of Leganes.
28 citations
TL;DR: In this article, the effects of the heating power and state of charge (SOC) on thermal runaway (TR) characteristics of large format (Ni1/3Co/3Mn 1/3)O2 batteries under overheat were investigated experimentally.
28 citations
TL;DR: In this article , two principal thermal enhancement techniques (i.e., finned tubes and conductive metal foams) are numerically investigated for melting processes in a shell-and-tube latent heat thermal energy storage system.
TL;DR: In this article, the effect of forced cooling enhancements such as baffles and fins on the performance of solar photovoltaic thermal collectors (PV/T) was investigated.
TL;DR: In this article , the thermal energy storage characteristics of a packed bed thermal storage device (PBTESD) filled with spherical phase change capsules are analyzed, and the effects of Reynolds number, Stefan number, dimensionless diameter and effective thermal conductivity of phase change material (PCM) on the temperature evolution trend and thermal performance of PBTESDs were investigated by single factor analysis.
TL;DR: In this paper , a dual-mode radiative thermal management device was proposed to achieve a high performance, intelligently auto-switched and zero-energy dualmode thermal management system, which can realize two-way temperature control around comfortable temperature zone of human living.
Abstract: Reducing needs for heating and cooling from fossil energy is one of the biggest challenges, which demand accounts for almost half of global energy consumption, consequently resulting in complicated climatic and environmental issues. Herein, we demonstrate a high-performance, intelligently auto-switched and zero-energy dual-mode radiative thermal management device. By perceiving temperature to spontaneously modulate electromagnetic characteristics itself, the device achieves ~859.8 W m-2 of average heating power (∼91% of solar-thermal conversion efficiency) in cold and ~126.0 W m-2 of average cooling power in hot, without any external energy consumption during the whole process. Such a scalable, cost-effective device could realize two-way temperature control around comfortable temperature zone of human living. A practical demonstration shows that the temperature fluctuation is reduced by ~21 K, compared with copper plate. Numerical prediction indicates that this real zero-energy dual-mode thermal management device has a huge potential for year-round energy saving around the world and provides a feasible solution to realize the goal of Net Zero Carbon 2050.
TL;DR: In this paper , a parabolic trough solar collector (PTSC) is used to convert the sun's light energy into thermal energy and the useful heat is then transferred to the organic Rankine cycle (ORC) sub-cycle.
TL;DR: In this paper, a review of the challenges and opportunities in thermal management of aircraft is presented, along with possible solutions and opportunities from the literature, with a focus on the use of composites in transferring waste heat from aircraft to the surrounding atmosphere.
TL;DR: In this article , an innovative thermal collector for photovoltaic-thermal (PV/T) systems was proposed to achieve the thermal and electrical conversion efficiencies of the water-based PV/T system.
TL;DR: In this article, the authors demonstrate an unconventional passive cooling process in a system with high light absorption of approximately 99.3%, where the main component of the system is an aerogel with a unique conical structure that performs thermal transfer.
TL;DR: In this paper , a review of major factors that need to be assessed before an integration of the latent thermal energy system is undertaken is given, and challenges faced when constructing and experimenting with the storage systems are mentioned.
Abstract: Demand for high temperature storage is on a high rise, particularly with the advancement of circular economy as a solution to reduce global warming effects. Thermal energy storage can be used in concentrated solar power plants, waste heat recovery and conventional power plants to improve the thermal efficiency. Latent thermal energy storage systems using phase change materials are highly thought for such applications due to their high energy density as compared to their sensible heat counterparts. This review, therefore, gives a summary of major factors that need to be assessed before an integration of the latent thermal energy system is undertaken. In addition, challenges faced when constructing and experimenting with the storage systems are mentioned. Finally, an insight on the cost analysis and the general performance metrics of the latent thermal energy storage systems is provided before conclusions are drawn.
TL;DR: In this article , the authors demonstrate an unconventional passive cooling process in a system with high light absorption of approximately 99.3%, where the main component of the system is an aerogel with a unique conical structure that performs thermal transfer.
TL;DR: In this paper, the Curie effect of ferromagnetic material, triboelectrification and electrostatic induction effect was used to realize the energy conversion of heat energy-mechanical energy-electric energy via coupling with the CurIE effect of Ferromagnetic materials, and thus the transferred charges of 325 nC can be obtained.
TL;DR: In this paper , a heat-mechanical-electric energy conversion system is built based on Curie effect of ferromagnetic material, triboelectrification and electrostatic induction effect of the tribolectric nanogenerator which achieves the conversion of heat energy into electric energy.
TL;DR: In this article , the authors present the most up-to-date, comprehensive, and trustworthy information on the role of MXene-based phase change material (PCM) in thermal energy storage applications.
TL;DR: In this paper , the effects of different operational and geometrical parameters on energy consumption of flat sheet direct contact membrane distillation (DCMD) for solar desalination purposes are investigated.
TL;DR: In this paper , a photovoltaic/thermal (PV/T) system integrated with porous phase change material (PPCM) has been proposed for thermal regulation of PV/T systems.
TL;DR: In this article , the photovoltaic hybrid thermal system has been fabricated for an effective increase in production of electric output, and the nanofluids MWCNT and Fe 2 O 3 as the passive cooling agent for higher electric output production without any major energy loss.
TL;DR: In this article, a photovoltaic/thermal (PV/T) system integrated with porous phase change material (PPCM) has been proposed for thermal regulation of PV/T systems.
TL;DR: In this article, an electrowinning-coupled CO2 capture (ECC) system was presented, which mimics the industrially available electro-refining process for an energy-efficient amine-based CO 2 capture.
TL;DR: In this paper, a common distribution network is used as an energy storage system and integrates the PV electricity excess from the buildings into the 5th Generation District Heating and Cooling (5GDHC) system, at ultra-low temperature.
TL;DR: In this paper , the capability and feasibility of the integration of energy geostructures into the 5GDHC networks are evaluated through reviewing different aspects of thermal performance of operating energy geosyntructures and 5DHC networks and some practical recommendations are provided concerning dealing with some implementation challenges.