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Kallras i småhus: En studie om termisk komfort i hus med golvvärme och uteluftsventiler
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2024 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Cold Drafts in Single-Family Homes : A Study on Thermal Comfort in Houses with Underfloor Heating and Outdoor Air Vents (English)
Abstract [sv]

I ett hus med uteluftsventiler och golvvärme upplevs kyla och kallras under kalla vinterperioder. Denna studie har undersökt detta problem genom en energibalansanalys av värmeflödet i ventilationsluften och golvvärmen i vardagsrummet, där drag och försämrad termisk komfort har rapporterats. Analysen visar att frånvaron av konvektorer under fönstren har gjort det svårt att upprätthålla god termisk komfort nära fönstren. Kall inkommande uteluft kan skapa problem i närheten av fönstren och kallras kan även uppstå från de kalla fönsterytorna när uteluftsventilerna är stängda. Golvvärmen genererar stigande värme inne i rummet och god termisk komfort, men golvvärmens effekt har inte varit tillräcklig under extrem kyla i närheten av fönstren. Det kan delvis bero på för stora luftmängder genom vardagsrummet då även delar av uteluften till köksdelen av huset tas in via vardagsrummet. För att förbättra de termiska förhållandena närmast fönstren kan en omplacering av uteluftsventilerna mot rummets hörn delvis hjälpa. Närmast fönstren bör man också överväga att installera ett ökat antal värmeslingor för att motverka kylan. Att byta ventilationen till FTX-system är kostsamt men också ett alternativ.

Abstract [en]

In a house with outdoor air vents and underfloor heating, coldness is experienced during cold winter periods. This study has investigated this problem through an energy balance analysis of the heat flow in the ventilation air and underfloor heating in the living room, where drafts and reduced thermal comfort have been reported. The analysis shows that the absence of convectors under the windows has made it difficult to maintain good thermal comfort near the windows. Cold incoming outdoor air can create problems near the windows and cold drafts can also occur from the cold window surfaces when the outdoor air vents are closed. The underfloor heating generates rising heat inside the room and good thermal comfort, but the heating power of the floor heating has not been sufficient near the windows during extreme cold. This may partly be due to too large amounts of air through the living room, as parts of the outside ventilation air to the kitchen part of the house are also taken in via the living room. To improve the thermal conditions closest to the windows, relocating the outside air vents towards the corners of the room can partially help. Closest to the windows, one should also consider installing an increased number of heating coils to counteract the cold. Changing the ventilation to an FTX system is costly but also an option.

 

Place, publisher, year, edition, pages
2024.
Series
TRITA-ABE-MBT ; 24753
Keywords [en]
Air heating, Cold draft, Draft, DR-index, Energy, Low temperature, Outdoor air vents, PMV, PPD, Power, Thermal comfort, Underfloor heating.
Keywords [sv]
Drag, DR-index, Effekt, Energi, Kallras, Luftvärme, Lågtemperatur, Golvvärme, Termisk komfort, PPD, PMV, Uteluftventiler.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-355281OAI: oai:DiVA.org:kth-355281DiVA, id: diva2:1908524
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Available from: 2024-10-28 Created: 2024-10-28

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