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Simulation of a scaled down version of a run-around coil heat recovery system on COMSOL® Multiphysics.
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Due to changing anthropological activities, the consumption of resources is continuously increasing. As humans are spending more time indoors, the energy demand is also increasing. The building sector is a major consumer of energy. In buildings, space heating is important to maintain a comfortable space. For this, apart from increasing the thermal insulation and wellconstructed buildings, air-air heat recovery systems(among others) are being used to precondition the ambient air, so that the exhaust air from the conditioned space can pre-heat/ pre-cool the ambient air, depending on the season.

In this thesis report, the run around coil heat recovery systems are discussed. A Multiphysics model on COMSOL® Multiphysics was created which was a scaled down version of an actual system. Real-life boundary conditions were provided as inputs to the model and its results were subsequently discussed. First, a literature review of the different air-air heat recovery systems was done, followed by discussing their various advantages and disadvantages. Next, an introduction to COMSOL® was made, followed by the construction of the model and the materials, mesh and physics conditions which were used along with the solver configuration. In the end the model showed success in pre-heating the ambient air in winter and pre-cooling it in summer seasons. Along with that other results were also discussed. In the end some options for future work on the project were also discussed.

Abstract [sv]

Resursförbrukningen ökar kontinuerligt som ett resultat av förändrade antropologiska aktiviteter. Samtidigt ökar energibehovet i takt med att människor tillbringar allt mer tid inomhus.

Byggsektorn är en stor energiförbrukare, inte minst genom byggnaders uppvärmning som är viktig för att upprätthålla goda komfortnivåer. För att uppnå detta används, förutom ökad värmeisolering och välkonstruerade byggnader, också bland annat så kallade luftluftvärmeåtervinningssystem för att förkonditionera den omgivande luften, så att frånluften från det konditionerade utrymmet kan förvärma eller -kyla den tillströmmande luften, beroende på säsong.

I detta examensarbete diskuteras så kallade run around coil värmeåtervinningssystem. En Multiphysics-modell skapades med COMSOL® Multiphysics och utgjorde en nerskalad version av ett faktiskt system. Modellen simulerades med verklighetsbaserade randvillkor som insignaler varefter resultatet diskuterades.

Inledningsvis gjordes en litteraturstudie av olika luft-luft värmeåtervinningssystem, följt av en diskussion om deras olika för- och nackdelar. Därefter konstruerades modellen i COMSOL® och inställningar för material, mesh och fysikförhållanden bestämdes och användes tillsammans med solver-konfigurationen.

Simuleringen visade på att värmeåtervinningssystemet framgångsrikt förvärmer den tillströmmande luften på vintern och förkyler den under sommarhalvåret. Även andra resultat diskuterades liksom förslag på fortsatt arbete.

Place, publisher, year, edition, pages
2019. , p. 57
Series
TRITA-ITM-EX ; 2019:690
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-264263OAI: oai:DiVA.org:kth-264263DiVA, id: diva2:1372763
External cooperation
COMSOL® AB
Supervisors
Examiners
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2019-11-29Bibliographically approved

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