Change search
ReferencesLink to record
Permanent link

Direct link
Energy density and volume expansion in solid-liquid phase change, for energy applications
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Phase change materials (PCMs) have long been studied as thermal energy storage media. However, the Swedish company, Exencotech AB, reaching beyond this usual scope of PCMs, has designed a system that uses PCMs as working medium to produce electricity from waste heat. To achieve high system energy efficiency, PCMs with low heats of fusion and large volume expansions are favored. Interestingly, this is the opposite of the desired properties of a PCM working in energy storage applications.

This work has aimed to find suitable alternative PCMs for Exencotech. After an intensive literature survey, eight candidates are identified from several PCM types. They are subjected to T-history test and volume expansion test in order to map out their volume expansion density chart. After analyzing the results from the tests, four most promising candidates with different melting temperatures, A, B, C, D, are finally proposed.

The results of the work show that A has the highest volume expansion density which is 0.97 cm

3/kJ. It is the most promising candidate found out of the many that were considered, that gives the highest energy efficiency for Exencotech, if they are able to find a suitable heat source and a heat sink.

(In order to keep some information confidential to the general public, certain names and values are coded in this report)

Place, publisher, year, edition, pages
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-128949OAI: diva2:649017
Subject / course
Energy Technology
Educational program
Master of Science - Environomical Pathways for Sustainable Energy Systems
2013-08-21, Djupdalsvägen 7, 192 51 Sollentuna, Stockholm, 09:00 (English)
Available from: 2013-09-17 Created: 2013-09-17 Last updated: 2013-09-17Bibliographically approved

Open Access in DiVA

Master thesis_Ruijun Pan(9812 kB)3111 downloads
File information
File name FULLTEXT01.pdfFile size 9812 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Heat and Power Technology
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3113 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 285 hits
ReferencesLink to record
Permanent link

Direct link