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Enhancement of heat transfer for thermal energy storage application using stearic acid nanocomposite with multi-walled carbon nanotubes

Li, TingXian; Lee, Ju-Hyuk; Wang, RuZhu; Kang, Yong Tae - In: Energy 55 (2013) C, pp. 752-761

A latent heat storage nanocomposite made of stearic acid (SA) and multi-walled carbon nanotube (MWCNT) is prepared for thermal energy storage application. The thermal properties of the SA/MWCNT nanocomposite are characterized by SEM (scanning electron microscopy) and DSC (differential scanning...

Persistent link: https://www.econbiz.de/10010811023

Experimental volumetric heat transfer characteristics between oil and glass pebbles in a small glass tube storage

Mawire, A.; McPherson, M.; van den Heetkamp, R.R.J.; … - In: Energy 35 (2010) 3, pp. 1256-1263

A small glass tube containing oil and glass pebbles is constructed to evaluate rapidly the volumetric heat transfer characteristics during charging. An electrical hot-plate in thermal contact with a steel spiral coil is used to charge the oil/pebble-bed storage under different average charging...

Persistent link: https://www.econbiz.de/10010811096

Loss analysis of thermal reservoirs for electrical energy storage schemes

White, Alexander J. - In: Applied Energy 88 (2011) 11, pp. 4150-4159

(or exergy) that is most relevant. Accordingly, results are presented as loss coefficients which are defined as the …

Persistent link: https://www.econbiz.de/10010576229

Characterization of melting and solidification in a real-scale PCM–air heat exchanger: Experimental results and empirical model

Dolado, Pablo; Lazaro, Ana; Marin, Jose M.; Zalba, Belen - In: Renewable Energy 36 (2011) 11, pp. 2906-2917

This paper describes the experimental studies carried out to test thermal cycling of a real-scale PCM–air heat exchanger at ambient temperatures. To achieve this goal an experimental setup previously designed and used for testing real-scale prototypes of PCM–air heat exchangers is modified....

Persistent link: https://www.econbiz.de/10011044705

Parametric studies and optimisation of pumped thermal electricity storage

McTigue, Joshua D.; White, Alexander J.; Markides, … - In: Applied Energy 137 (2015) C, pp. 800-811

Several of the emerging technologies for electricity storage are based on some form of thermal energy storage (TES). Examples include liquid air energy storage, pumped heat energy storage and, at least in part, advanced adiabatic compressed air energy storage. Compared to other large-scale...

Persistent link: https://www.econbiz.de/10011116128

Thermal and sanitary performance of domestic hot water cylinders: Conflicting requirements

Armstrong, Peter M.; Uapipatanakul, Meg; Thompson, Ian; … - In: Applied Energy 131 (2014) C, pp. 171-179

In order to understand the sanitary implications around the demand side management of domestic hot water cylinders, microbial samples were taken from the bottom of 10 UK domestic electric hot water tanks whose heating elements are connected to a controlled off-peak supply. The results indicated...

Persistent link: https://www.econbiz.de/10010906301

Closed and open thermochemical energy storage: Energy- and exergy-based comparisons

Abedin, Ali Haji; Rosen, Marc A. - In: Energy 41 (2012) 1, pp. 83-92

. In this article, closed and open thermochemical TES is investigated using energy and exergy methods. The latter method … enhances assessments of made using the former. Efficiencies based on energy and exergy are determined for the overall storage … analyses of closed and open thermochemical TES. The overall system energy and exergy efficiencies, respectively, are determined …

Persistent link: https://www.econbiz.de/10010808825

Numerical simulation and exergetic performance assessment of charging process in encapsulated ice thermal energy storage system

MacPhee, David; Dincer, Ibrahim; Beyene, Asfaw - In: Energy 41 (2012) 1, pp. 491-498

-filled capsules while neglecting storage tank wall effects and heat penetration. Energy and exergy efficiencies were calculated while … not accurately reflect system performance, and in all cases, were found to be above 99.96%. However, exergy efficiencies … exergy efficiency and was a source of very little entropy generation. Thus, EITES designers could increase both flow rate and …

Persistent link: https://www.econbiz.de/10010808845

Thermal performance of a small oil-in-glass tube thermal energy storage system during charging

Mawire, A.; McPherson, M.; van den Heetkamp, R.R.J. - In: Energy 34 (2009) 7, pp. 838-849

and the total exergy stored. The energy and exergy delivery rates of the energy delivery device (EDD) are also evaluated …

Persistent link: https://www.econbiz.de/10010811177

Assessment of a closed thermochemical energy storage using energy and exergy methods

Abedin, Ali Haji; Rosen, Marc A. - In: Applied Energy 93 (2012) C, pp. 18-23

intensively. To improve understanding of thermochemical TES systems and their implementation, energy and exergy analyses are … processes. Locations and causes of thermodynamic losses in thermochemical TES systems are being specified using exergy analysis …. The analytical methodology applied in this study identifies that energy and exergy efficiencies differ for thermochemical …

Persistent link: https://www.econbiz.de/10010571977