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Preparation and performance of form-stable polyethylene glycol/silicon dioxide composites as solid–liquid phase change materials
School of Chemical and Energy Engineering, Guangzhou, China. (bioenergy group)
School of Chemical and Energy Engineering, Guangzhou, China.
School of Chemical and Energy Engineering, Guangzhou, China.
School of Chemical and Energy Engineering, Guangzhou, China.
2009 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 86, no 2, p. 170-174Article in journal (Refereed) Published
Abstract [en]

This work mainly involved the preparation and characterization of form-stable polyethylene glycol (PEG)/silicon dioxide (SiO2) composite as a novel solid–liquid phase change material (PCM). In this study, the polyethylene glycol/silicon dioxide composites as form-stable, solid–liquid phase change material (PCM) was prepared. In this new material, the polyethylene glycol acts as the latent heat storage material and silicon dioxide serves as the supporting material, which provides structural strength and prevents the leakage of the melted polyethylene glycol. Results indicated that the composite remained solid when the weight percentage of silicon dioxide was higher than 15%. Moreover, the polyethylene glycol was observed to disperse into the network of the solid silicon dioxide by investigation of the structure of the composite PCMs using a scanning electronic microscope (SEM). The properties of the porous materials and phase change materials were characterized using Fourier transformation infrared spectroscope (FTIR). The transition process was observed using polarizing optical microscope (POM) and dynamic thermo mechanic analysis (DMA). The melting temperatures and latent heats of the form-stable PEG/SiO2 composite PCMs were determined using differential scanning calorimeter (DSC).

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 86, no 2, p. 170-174
Keywords [en]
Polyethylene glycol; Silicon dioxide; Heat storage materials; Phase change materials
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-7452DOI: 10.1016/j.apenergy.2007.12.003ISI: 000260269000007Scopus ID: 2-s2.0-52149121582OAI: oai:DiVA.org:mdh-7452DiVA, id: diva2:274730
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-4RTTM05-1&_user=651553&_coverDate=02%2F28%2F2009&_alid=1071235708&_rdoc=3&_fmt=high&_orig=search&_cdi=5683&_sort=r&_docanchor=&view=c&_ct=20&_acct=C000035198&_version=1&_urlVersion=0&_userid=651553&md5=d9852363f4cbdd257ed11ffc910eee2a

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