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Modelling and simulation of Villa Falk: Trade-off between valve operations and the room temperature
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This thesis has been carried out on behalf of Umeå University. The thesis has a dual objective. Firstly, an advanced energy simulation model of a real house, (Villa Falk), is developed with the software IDA ICE. Main focus of this model has been on the modelling of the whole house, the envelope with all the thermal zones and the Heating Ventilation Air Conditioning (HVAC) system. The second objective is to investigate how indoor temperature change in relation to different types of controls of the underfloor heating.

Villa Falk was a part of CERBOF project "Energy-efficient construction in cold climates". The house has been monitored since year 2011. In particular, ventilation, heating, domestic hot water, solar panel system has been observed for providing energy meters during the years. These data have been used for developing input curves for the simulation model.

The results of the energy simulation model of Villa Falk shows large discrepancies with the measured data. In particular, the position of the immersed heater and its operations, mostly affect the final outcomes of the model. Moreover a detail list of all the uncertain measured is ranked at section 5.2 of this report.

The second objective is achieved by investigating several control strategies of the floor heating system. For this purpose, a simple house made by two adjacent zone is analyzed. Step response test of the underfloor heating system is carry out in order to apply Nichols-Ziegler heuristic theory for tuning the control. Several control has been tested and results are compared for showing the potential and difference among controls.

The results of the control strategies applied to the underfloor heating is provided by covering different aspects. Firstly, the trade-off between indoor temperature and mass flow rate. The variation of latter parameter indicates how many operations the valve of the underfloor heating has to make in order to maintain a comfort temperature in the thermal zone. Secondly, the proportional control works best for the indoor climate, thus the comfort of the occupants with a PPD value of 12.6%. Whereas the ON/OFF control shows worsen results with a PPD of 22,3 %. Moreover, the results show how the slab thickness of the underfloor heating influence the indoor comfort.

Abstract [sv]

Detta examensarbete har utförts på uppdrag av Umeå universitet. Examenarbetet är indelat i två olika mål, där ena är att göra en avancerad modell av ett riktigt hus i IDA ICE som kallas Villa Falk. Modellen innehåller alla rum där varje rum är en egen zon samt värme och ventilationssystemet. Det andra målet är att se hur inomhus klimatet ändras med olika typer av styrningar på golvvärme.

Villa Falk ingick i CERBOF-projektet ”energieffektivt byggande i kallt klimat”, i projektet togs energi- och temperaturmätningar på byggnadens värme och ventilationssystem. Mätningarna är gjorda från 2011. Dessa mätvärden har används för att göra kurvor för värme och ventilation system samt styrning av varmvatten.

Resultatet av Villa Falk visar stora skillnader på hur mycket elpatronen arbetar samt energibehovet jämfört med simuleringen och de uppmäta värdena.

Ett enkelt hus ritades upp i IDA ICE med 2 intilliggande zoner för att undersöka flera olika styrningar av golvvärmen. Stegsvar test gjordes på golvvärmen för att kunna tillämpa Nichols-Ziegler teori för att ställa in PI regulatorn. Resultaten jämförs för att visa skillnader mellan de olika regulatorerna.

Resultatet från golvvärmen visar att en ventil som reglerar flödet ofta får ett bättre resultat än en ventil som reglerar mindre. Proportionell reglering får bäst resultatet med ett PPD värde på 12,6 % och av/på reglering får sämsta resultatet med ett PPD på 22,3 %. Dessutom visar resultaten att plattans tjocklek påverkar inomhus klimatet.

Place, publisher, year, edition, pages
2015. , 29 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-104987OAI: oai:DiVA.org:umu-104987DiVA: diva2:822458
Subject / course
Energiteknik
Educational program
Bachelor of Science Programme in Energy Engineering
Supervisors
Examiners
Available from: 2015-06-22 Created: 2015-06-16 Last updated: 2015-06-22Bibliographically approved

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