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Performance improvement from single to multi phase change materials in a thermal energy storage system
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Phase change materials are used in many applications to work as thermal energy storage systems. One way to transfer the heat is by letting water flow through a finned pipe submerged in i tank filled with PCMs. This model is analyzed with a finite element difference  based numerical software. The power ratio between using single-PCM and multi-PCMs is compared. The hypothesis was that a multi-PCM configuration is more efficient than a single.

The results show that a multi-PCM configuration is more efficient than a single-PCM configuration. It however also indicates that it is of great importance to chose the right temperature span of PCM temperatures to achieve as high power performance as possible. This is recommended for further studies.

Abstract [sv]

Fasväxlingsmaterial (Phase Change Material, PCM) används i många sammanhang för att lagra energi vid konstant temperatur. Ett sätt att överföra värmen är att låta vatten flöda genom ett flänsat rör nedsänkt i en tank fylld med PCM. Denna modell analyseras med en FEM-baserad numerisk mjukvara. Studien jämför den utvunna effekten ur en modell med endast ett PCM, med effekten utvunnen ur en modell med tre olika PCM. Hypotesen var att ett system med flera material var bättre än ett system med endast ett för att erhålla maximal effekt.


Resultatet visar att en modell med flera PCM är effektivare än en modell med endast ett. Det indikerar betydelsen av vilka temperaturer av PCM som väljs för att uppnå så hög effekt som möjligt. Detta område rekommenderas för fortsatta studier.

Place, publisher, year, edition, pages
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-175153OAI: diva2:860033
Educational program
Master of Science in Engineering - Design and Product Realisation
Available from: 2015-10-20 Created: 2015-10-09 Last updated: 2015-10-20Bibliographically approved

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