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Enhanced thermal conductivity and thermal performance of form-stable composite phase change materials by using β-Aluminum nitride
Mälardalen University, School of Sustainable Development of Society and Technology. (bioenergy group)
Mälardalen University, School of Sustainable Development of Society and Technology. (bioenergy group)ORCID iD: 0000-0003-0300-0762
2009 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 86, no 7-8, p. 1196-1200Article in journal (Refereed) Published
Abstract [en]

β-Aluminum nitride powder is a promising additive due to its great conductivity value, which can enhance the thermal conductivity of organic phase change materials. In this paper, a high conductivity form-stable phase change material was prepared by blending polyethylene glycol, silica gel, and β-Aluminum nitride powder. The conductivity value of the composite PCMs was determined using the Hotdisk thermal analyzer, which is based on the transient plane source technique. Experiment of heat storage and release performance was carried out to investigate heat efficiencies of TES system. The results showed that thermal conductivity of composite PCMs increased with an increase in β-Aluminum nitride content, but the value of latent heat decreased correspondingly. There was no change on the melting temperature while different ratios of composites. The value of thermal conductivity changed from 0.3847 W m−1 K−1 to 0.7661 W m−1 K−1 with the increase of mass ratio of β-Aluminum nitride from 5% to 30%. The heat storage and release rate of the composite PCMs was higher than that of pure polyethylene glycol.

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 86, no 7-8, p. 1196-1200
Keywords [en]
Polyethylene glycol; Silica gel; β-Aluminum nitride; Thermal conductivity
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-7453DOI: 10.1016/j.apenergy.2008.10.020ISI: 000265033400025Scopus ID: 2-s2.0-61849180914OAI: oai:DiVA.org:mdh-7453DiVA, id: diva2:274731
Available from: 2009-11-16 Created: 2009-10-30 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Mobilized Thermal Energy Storage for Heat Recovery for Distributed Heating
Open this publication in new window or tab >>Mobilized Thermal Energy Storage for Heat Recovery for Distributed Heating
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conventional energy sources—oil and electricity—dominate the heat supply market. Due to their rising costs and their negative environmental effects on global climate change, it is necessary to develop an alternative heat supply system featuring low cost, high energy efficiency and environment friendliness. At present, it is often challenging to supply heat to detached buildings due to low energy efficiency and high distribution cost. Meanwhile, significant amounts of industrial waste and excess heat are released into the environment without recycling due to the difficulty of matching time and space differences between suppliers and end users. Phase change materials (PCMs), with the advantages of being storable and transportable, offer a solution for delivering that excess heat from industrial plants to detached buildings in sparse, rural areas.

 

The objective of this thesis is to study PCMs and latent thermal energy storage (LTES) technology, and to develop a mobilized thermal energy storage (M-TES) system that can use industrial waste or excess heat for heat recovery and distribution to areas in need.

 

Organic PCMs were chosen for study because they are non-toxic and non-corrosive, and they exhibit no phase separation and little sub-cooling when compared to inorganic PCMs. Two major issues including leakage of liquid PCMs and low thermal conductivity. Polyethylene glycol (PEG) was chosen to help analyze the thermal behavior of organic PCMs and PEG-based form-stable composites. To overcome the issue of low thermal conductivity, modified aluminum nitride (AlN) powder was added to the composites. Increased thermal conductivity traded off decreased latent heat. The PEG/EG composite, prepared by mixing the melted PEG into an expanded graphite (EG) matrix showed good thermal performance due to its large enthalpy and high thermal conductivity.

 

To make a systematic study of the M-TES system, a compact lab-scale system was designed and built. Characteristics of PCM were studied, and the performance of the direct-contact TES container was investigated. A case study using an M-TES system to deliver heat from a combined heat and power (CHP) plant to a small village was conducted. A technical and economic feasibility study was conducted for an integrated heat supply system using the M-TES system. In addition, the options for charging a TES container at a CHP plant were analyzed and compared from the viewpoints of power output, heat output and incomes.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2010
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 92
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-11142 (URN)978-91-86135-98-0 (ISBN)
Public defence
2010-12-20, Lambda, Mälardalen University, Västerås, 10:00 (English)
Opponent
Supervisors
Projects
Ångpanneföreningens Forskningsstiftelse (ÅF)
Available from: 2010-11-22 Created: 2010-11-18 Last updated: 2010-11-29Bibliographically approved

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Publisher's full textScopushttp://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V1T-4V402PD-1&_user=651553&_coverDate=08%2F31%2F2009&_alid=1071235708&_rdoc=4&_fmt=high&_orig=search&_cdi=5683&_sort=r&_docanchor=&view=c&_ct=20&_acct=C000035198&_version=1&_urlVersion=0&_userid=651553&md5=0d94f4edeb84419d9efcb05be55a2b04

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Yan, Jinyue

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