23 results on '"Hansen, Tessa Kvist"'
Search Results
2. Climate data for moisture simulations: producing a Danish moisture reference year and comparison with previously used reference year locations
- Author
-
Jensen, Nickolaj Feldt, primary, Hansen, Tessa Kvist, additional, Svane, Anne Marie, additional, Morelli, Martin, additional, and Waagepetersen, Rasmus, additional
- Published
- 2023
- Full Text
- View/download PDF
3. Long term in situ measurements of hygrothermal conditions at critical points in four cases of internally insulated historic solid masonry walls
- Author
-
Hansen, Tessa Kvist, Bjarløv, Søren Peter, Peuhkuri, Ruut Hannele, and Harrestrup, Maria
- Published
- 2018
- Full Text
- View/download PDF
4. Performance of Polyethylene Vapor Barrier Systems in Temperate Climates
- Author
-
Rasmussen, Torben Valdbjørn, primary, Hansen, Tessa Kvist, additional, Shashoua, Yvonne, additional, Ottosen, Lisbeth M., additional, Pedersen, Louise Green, additional, Nielsen, Jens Kromann, additional, and Steenstrup, Frederik R., additional
- Published
- 2022
- Full Text
- View/download PDF
5. Performance of Polyethylene Vapor Barrier Systems in Temperate Climates
- Author
-
Rasmussen, Torben Valdbjørn, Hansen, Tessa Kvist, Shashoua, Yvonne, Ottosen, Lisbeth M., Pedersen, Louise Green, Steenstrup, Frederik R., Rasmussen, Torben Valdbjørn, Hansen, Tessa Kvist, Shashoua, Yvonne, Ottosen, Lisbeth M., Pedersen, Louise Green, and Steenstrup, Frederik R.
- Abstract
The performance of nine different vapor barrier systems comprising polyethylene (PE) membranes were assessed. The vapor barrier systems comprised membranes of virgin PE, 100% new PE, regenerated PE and multilayered virgin and regenerated PE. Membranes were joined either with tape suited to the individual system or an adhesive base on butyl rubber. The vapor barrier systems were evaluated and compared using standard laboratory tests. Chemical analytical techniques and physicomechanical tests were used. Mechanical properties were assessed using laboratory tests recommended by the harmonized standard EN 1385. Chemical analyses followed standard laboratory protocols performed with specialized equipment and visual examination. Chemical and mechanical properties were determined before and after exposure to an aging regime comprising 168 days at 70 °C in total. The chemical stability of the plastic present in each membrane was further evaluated after an additional exposure to an aging regime comprising 50 days followed by another 30 days at 70 °C. Additional aging indicated chemical changes in the membrane material with time. However, it was not possible to distinguish between aging properties for membranes containing virgin PE, 100% new PE, regenerated PE or multilayered virgin and regenerated PE.
- Published
- 2022
6. Anvendelse af træ i byggeriet:Potentialer og barrierer
- Author
-
Rasmussen, Torben Valdbjørn, Rasmussen, Birgit, Andersen, Helle Vibeke, Birgisdottir, Harpa, Nielsen, Jørgen, Jermiin, Louise, Harrestrup, Maria, Hansen, Tessa Kvist, and Cornelius, Thomas
- Subjects
Canada ,arkitektur ,Tyskland ,Norge ,udfordring ,Danmark ,byggeri ,substitution ,definition ,trækonstruktioner ,Finland ,byggeproces ,totaløkonomi ,træbyggeri ,anvendelse ,bæredygtighed ,bygningsfysik ,træarter ,barriere ,Sverige ,Østrig ,livscyklusvurdering ,CO2 ,Træ ,deponi ,spørgeskemaundersøgelse ,eksempler ,potentiale - Abstract
Rapporten ’Anvendelse af træ i byggeriet – Potentialer og barrierer’ samler eksisterende viden om fordele og ulemper ved træbyggeri, og gør status for omfanget af træbyggeri i Danmark.Spørgsmålet om anvendelse af træ i byggeriet belyses gennem en kvalitativ spørgeskemaundersøgelse, tre dialogmøder og kvalitative interviews med udvalgte nøglepersoner. Det er primært personer med erfaring fra byggebranchen; arkitekter, ingeniører, konstruktører, håndværkere, entreprenører, bygherrer og studerende, der har deltaget i spørgeskemaundersøgelsen og i dialogmøderne.Der er lavet en definition af træbyggeri, der præsenteres 8 eksisterende eksempler på træbyggeri i Danmark, der oplistes forskellige træarter og det gennemgås,hvordan Sverige, Norge, Finland, Østrig, Tyskland og Canada har forsøgt at øge brugen af træ i byggeriet gennem tiltag, som er beskrevet.Ud fra en livscyklusanalyse (LCA) er det vurderet, hvor meget CO2 Danmark kan spare ved at omlægge eksempelvis 10 % af konventionelt byggeri til træbyggeri om året frem til 2030.
- Published
- 2020
7. Luftudveksling mellem bolig og tagrum:PFT-målinger i 30 huse
- Author
-
Hansen, Tessa Kvist and Peuhkuri, Ruut Hannele
- Subjects
skimmelsvampe ,etageadskillelse ,ventilation ,luftkvalitet ,Indeklima - Abstract
Denne rapport beskriver resultaterne fra forskningsprojektet: Luftudveksling mellem bolig og tagrum. I projektet blev det undersøgt, i hvilket omfang der sker udveksling af luft mellem bolig og uudnyttede tagrum. Målet var på sigt at kunne vurdere, hvilken betydning mulig skimmelsvamp i et tagrum har for eksponeringen i den underliggende bolig samt at kunne vurdere fugtoverførslen fra boligen til uopvarmede tagrum.Luftudvekslingen mellem boliger og udnyttede uopvarmede tagrum blev undersøgt ved en passiv sporgasmetode. Metoden blev anvendt ved placering af to typer sporgasser i hver sin zone, hhv. bolig og tagrum. På baggrund af målte koncentrationsniveauer i de respektive zoner, samt beregnede emissionsrater baseret på temperaturmålinger, kunne udvekslingen mellem zonerne bestemmes, foruden luftskifterne i de to zoner. Der indgik 30 huse i undersøgelsen, og målingerne blev foretaget i to perioder for hvert hus; hhv. en kold og en varm periode. De 30 huse fordelte sig på byggeår fra 1920’erne til 2010’erne, et enkelt hus var dog fra 1719. Der var 19 huse med dampspærre i loftet og 11 huse uden. Derudover blev to typer af tagkonstruktioner undersøgt, men fordelingen var ikke ligelig (25-5). Det samme gælder huse med/uden mekanisk ventilation (6-24) og fordelingen mellem huse med mineraluld og cellulosebaseret loftisolering (27-3). Alle husene var placeret på Sjælland. Der blev desuden målt temperatur og relativ fugtighed i både boliger og tagrum samt målt udeklima.Undersøgelsen viste, at der forekom luftudveksling mellem bolig og uudnyttet, uopvarmet tagrum i begge retninger i både varme og kolde perioder. Dette gjorde sig gældende uanset, om der var en dampspærre eller ej. Som gennemsnitsbetragtning blev det fundet, at den opadgående luftoverføring var større end den nedadgående luftoverføring.På baggrund af de målte resultater, kunne der ikke konstateres en sammenhæng mellem udeluftskifte i tagrummet og absolut fugtindhold. Der kunne dog etableres en sammenhæng mellem den opadgående luftoverføring og fugttilskuddet fra boligen til tagrummet – jo højere opadrettet luftoverføring des mindre fugttilskud, dvs. forskel mellem fugtindhold i tagrummet i forhold til fugtindhold i boligen.Luftskifterne i boligerne blev målt til relativt lave værdier i forhold til bygningsreglementets krav om grundluftskifte på 0,30 l/s pr. m² opvarmet etageareal, hvilket tilnærmelsesvis svarer til 0,5h-1. Ingen af de undersøgte boliger levede op til kravet i vinterperioden, og kun fire boliger levede op til kravet i sommerperioden. Målingerne af luftskifterne i tagrummene viste en stor variation. Der blev konstateret synlig skimmel i tagrummene i tre af de undersøgte huse. Alle disse tagrum blev målt til at have relativt lave luftskifter i tagrummene.
- Published
- 2020
8. Written guidelines for decision making concerning the possible use of internal insulation in historic buildings
- Author
-
Freimanis, Ritvars, Blumberga, Dagnija, Veidenbergs, Ivars, Hansen, Tessa Kvist, Du, Guangli, Stöcker, Eric, Sontag, Heike, Freudenberg, Peggy, Janssen, Hans, Roels, Staf, di Giuseppe, Elisa, D'Orazio, Marco, Gianangeli, Andrea, Maracchini, Gianluca, Quagliarini, Enriro, Møller, Eva B., Capener, Carl-Magnus, Lång, Lukas, Johansson, Pernilla, Lasvaux, Sebastien, Giorgi, Morgane, Favre, Didier, Padey, Pierryves, Wagner, Guy, Blumberga, Andra, and de Place Hansen, Ernst Jan
- Subjects
Insulation systems ,Energy saving potential ,Guidelines ,Visual assessment ,Decision making - Abstract
This report is one of five deliverables related to WP6 ‘Development and evaluation of guidelines and web-based preliminary assessment tool‘. The prime objective of WP6 is to develop and to assess written and web-based guidelines and a web tool (including a feasibility study of possible input and output data) for renovation of historic buildings with internal insulation. This deliverable contains the written guidelines, referring to Task 6.1, consisting of a guideline for setting the goal of applying internal insulation (Section 3), a guideline for deciding whether a building is suitable for internal insulation (Section 4), a guideline for selecting an internal insulation system (Section 5) and a guideline for evaluating the energy saving potential and the environmental impact (Section6). The written guidelines are also made accessible through a web-site, described in deliverable D6.3.
- Published
- 2020
9. Materialeegenskaber:test af polyethylenmembraners egenskaber før og efter accelereret ældning
- Author
-
Rasmussen, Torben Valdbjørn, Hansen, Tessa Kvist, Nielsen, Jens Kromann, Steenstrup, Frederik R., Ottosen, Lisbeth M., Petersen, Louise Green, Hansen, Morten Hjorslev, and Shashoua, Yvonne
- Subjects
dampspærre ,prøvning ,ren PE ,levetid ,kemisk ,membran ,regenerat ,klimaskærm ,egenskaber ,Polyethylen ,materialeegenskaber ,mekanisk ,bæredygtighed ,genbrugsplast ,accelereret ældning - Abstract
I forskningsrapporten – Materialeegenskaber, test af polyethylenmembraners egenskaber før og efter accelereret ældning – undersøges levetiden for dampspærre produceret af polyethylen (PE). Undersøgelsen omfatter dampspærre af ren PE og dampspærre produceret af regenereret PE samt kombinationer af ren og regenereret PE.Der undersøges 9 forskellige dampspærrer, tapede samlinger tilhørende de enkelte dampspærresystemer og samlinger klæbet med bånd af butyl.Tidligere var det almindeligt, at dampspærre var fremstillet af ren PE, men i dag kan man finde et stigende antal dampspærrer, som indeholder regenereret PE, eller en blanding af regenereret PE og ren PE, i handelen. Som en del af den øgede interesse for at fremme bæredygtighed i byggeriet, er det forventeligt, at en stigende andel af dampspærre fremstillet af regenereret PE eller en blanding af ren og regenereret PE, fremadrettet vil blive mere efterspurgte.Undersøgelsen omfatter blandt andet de udvalgte dampspærreres vanddampdiffusionsmodstand, rivestyrke, fladevægt og overfladespænding, og emnerne er undersøgt før og efter accelereret ældning. Accelereret ældning er udført i klimakammer. Ud fra ældningen er dampspærrerenes levetid bestemt.
- Published
- 2020
10. SBI 2020:06: Materialeegenskaber:Test af polyethylenmembraners egenskaber før og efter accelereret ældning
- Author
-
Rasmussen, Torben Valdbjørn, Hansen, Tessa Kvist, Nielsen, Jens Kromann, Steenstrup, Frederik R., Ottosen, Lisbeth M., Petersen, Louise Green, Hansen, Morten Hjorslev, and Shashoua, Yvonne
- Abstract
I forskningsrapporten – Materialeegenskaber, test af polyethylenmembraners egenskaber før og efter accelereret ældning – undersøges levetiden for dampspærre produceret af polyethylen (PE). Undersøgelsen omfatter dampspærre af ren PE og dampspærre produceret af regenereret PE samt kombinationer af ren og regenereret PE.Der undersøges 9 forskellige dampspærrer, tapede samlinger tilhørende de enkelte dampspærresystemer og samlinger klæbet med bånd af butyl.Tidligere var det almindeligt, at dampspærre var fremstillet af ren PE, men i dag kan man finde et stigende antal dampspærrer, som indeholder regenereret PE, eller en blanding af regenereret PE og ren PE, i handelen. Som en del af den øgede interesse for at fremme bæredygtighed i byggeriet, er det forventeligt, at en stigende andel af dampspærre fremstillet af regenereret PE eller en blanding af ren og regenereret PE, fremadrettet vil blive mere efterspurgte.Undersøgelsen omfatter blandt andet de udvalgte dampspærreres vanddampdiffusionsmodstand, rivestyrke, fladevægt og overfladespænding, og emnerne er undersøgt før og efter accelereret ældning. Accelereret ældning er udført i klimakammer. Ud fra ældningen er dampspærrerenes levetid bestemt.
- Published
- 2020
11. Written guidelines for decision making concerning the possible use of internal insulation in historic buildings
- Author
-
Blumberga, Andra, Freimanis, Ritvars, Blumberga, Dagnija, Veidenbergs, Ivars, Hansen, Ernst Jan De Place, Hansen, Tessa Kvist, Du, Guangli, Stöcker, Eric, Sontag, Heike, Freudenberg, Peggy, Janssen, Hans, Roels, Staf, di Giuseppe, Elisa, D'Orazio, Marco, Gianangeli, Andrea, Maracchini, Gianluca, Quagliarini, Enriro, Møller, Eva B., Capener, Carl-Magnus, Lång, Lukas, Johansson, Pernilla, Lasvaux, Sebastien, Giorgi, Morgane, Favre, Didier, Padey, Pierryves, and Wagner, Guy
- Subjects
Insulation systems ,Energy saving potential ,Guidelines ,Visual assessment ,Decision making - Abstract
This report is one of five deliverables related to WP6 ‘Development and evaluation of guidelines and web-based preliminary assessment tool‘. The prime objective of WP6 is to develop and to assess written and web-based guidelines and a web tool (including a feasibility study of possible input and output data) for renovation of historic buildings with internal insulation. This deliverable contains the written guidelines, referring to Task 6.1, consisting of a guideline for setting the goal of applying internal insulation (Section 3), a guideline for deciding whether a building is suitable for internal insulation (Section 4), a guideline for selecting an internal insulation system (Section 5) and a guideline for evaluating the energy saving potential and the environmental impact (Section 6). The written guidelines are also made accessible through a web-site, described in deliverable D6.3.
- Published
- 2020
12. Monitored conditions in wooden wall plates in relation to mold and wood decaying fungi
- Author
-
Hansen, Tessa Kvist, Jensen, Nickolaj Feldt, Møller, Eva, Hansen, Ernst Jan De Place, and Peuhkuri, Ruut Hannele
- Abstract
In historic masonry buildings, wood can be embedded in the walls as storey partition beams, or as supportive wall plates. Half-timbered masonry constructions, or wooden frames, e.g. combined with internal insulation, are other examples of wooden elements. Wood decaying fungi can cause serious damage to wood, which may lose mass and strength, ultimately yielding the risk of collapse. In addition, some fungal species may even be hazardous for occupants. All wood decaying fungi depend on favorable moisture and temperature conditions, although the threshold conditions may vary with various fungal species and types, and state of the wood. To predict the risk of occurrence of wood rot, several models have been developed, however most of these are based on a limited number of experiments, or very specific cases. For these reasons, the applicability of the models to other scenarios (fungal species, wood species) may not be appropriate. Furthermore, another failure mode for wood and moisture, is mold growth, which is initiated at lower moisture levels. An indication of risk of mold growth would indicate problems or risks before the initiation of wood rot. Mold growth does not deteriorate the wood, but is usually equally undesired due to health concerns of occupants. For this reason, there might be places where some mold growth would be acceptable, e.g. embedded beam ends if there is no transfer of air from the moldy area to the indoor air. Therefore, risk of rot could be important. The paper investigates models for mass loss due to wood decay and mold growth based on exposure time to favorable hygrothermal conditions. The investigation is based on inspection of wood samples (wall plates) from a full-scale experimental setup of masonry with embedded wood and monitored conditions, to which the prediction models will be applied. Monitored hygrothermal conditions were implemented in mold and wood decay models, and samples were removed from the test setup. The implemented models yielded high mold index and mass loss, whereas neither mold nor decay was observed in the physical samples. Results indicate that the implemented models, in these cases appear to overestimate the risks of mold and rot in the supportive lath behind the insulation.
- Published
- 2020
13. Web tool including feasibility study of possible input and output data
- Author
-
Møller, Eva B., Perkov, Thomas, Hansen, Tessa Kvist, Møller, Eva B., Perkov, Thomas, and Hansen, Tessa Kvist
- Abstract
This report describes the final version of the RIBuild Insulation Calculator tool for evaluating internal insulation of solid walls. In summary, the tool collects aggregates and presents the simulated data described in deliverable D6.5. Sorting- and filtering-functions helps the user to quickly find the right data and to get insight about the possibilities for internal insulation. In a test of the tool, the outcome was comparable with the outcomes of simulations with DELPHIN and WUFI, although the tool has many gaps, resulting in considerable deviations in a few points. The outputs are therefore useful but the user should therefore be aware of the shortcomings. Filling the gaps by supplementing with millions of simulations is not realistic instead the tool should be further developed by using a machine learning through using a meta-model.
- Published
- 2020
14. Robust Internal Thermal Insulation of Historic Buildings - Threshold values for failure, linked to types of building structures and failure modes
- Author
-
Johansson, Pernilla, Lång, Lukas, Capener, Carl-Magnus, Møller, Eva, Quagliarini, Enrico, D’Orazio, Marco, Gianangel, Andrea, Janssen, Hans, Feng, Chi, Langmans, Jelle, Jensen, Nickolaj Feldt, de Place Hansen, Ernst Jan, Peuhkuri, Ruut, and Hansen, Tessa Kvist
- Subjects
mould ,algae ,laboratory testing ,threshold values ,frost ,fungi ,rot ,predictive models ,cyanobacteria ,failure modes - Abstract
This report comprises a study of material threshold values, failure modes and related failure prediction models to enable an evaluation of adding internal insulation in historic brick buildings. Threshold values and prediction models have been investigated both within literature and through laboratory study, by for instance comparing prediction models to real field results and by testing threshold values in laboratory. The aim of this report is to find threshold values and suitable and reliable prediction models to be included in the decision guidelines and the web tool, which are the final outcomes of the RIBuild project. Failure modes included in the report are mould growth on building materials, rot and wood decay, frost damage and discoloration of facades. ispartof: pages:1-155 status: Published online
- Published
- 2019
15. Threshold values for failure, linked to types of building structures and failure modes
- Author
-
Johansson, Pernilla, Lång, Lukas, Capener, Carl-Magnus, Møller, Eva B., Quagliarini, Enrico, D'Orazio, Marco, Gianangeli, Andrea, Janssen, Hans, Feng, Chi, Langmans, Jelle, Feldt Jensen, Nickolaj, de Place Hansen, Ernst Jan, Peuhkuri, Ruut Hannele, and Hansen, Tessa Kvist
- Abstract
This report comprises a study of material threshold values, failure modes and related failure prediction models to enable an evaluation of adding internal insulation in historic brick buildings. Threshold values and prediction models have been investigated both within literature and through laboratory study, by for instance comparing prediction models to real field results and by testing threshold values in laboratory. The aim of this report is to find threshold values and suitable and reliable prediction models to be included in the decision guidelines and the web tool, which are the final outcomes of the RIBuild project. Failure modes included in the report are mould growth on building materials, rot and wood decay, frost damage and discoloration of facades. This report comprises a study of material threshold values, failure modes and related failure prediction models to enable an evaluation of adding internal insulation in historic brick buildings. Threshold values and prediction models have been investigated both within literature and through laboratory study, by for instance comparing prediction models to real field results and by testing threshold values in laboratory. The aim of this report is to find threshold values and suitable and reliable prediction models to be included in the decision guidelines and the web tool, which are the final outcomes of the RIBuild project. Failure modes included in the report are mould growth on building materials, rot and wood decay, frost damage and discoloration of facades.
- Published
- 2019
16. The effects of wind-driven rain on the hygrothermal conditions behind wooden beam ends and at the interfaces between internal insulationand existing solid masonry
- Author
-
Hansen, Tessa Kvist, Bjarløv, Søren Peter, Peuhkuri, Ruut, Hansen, Tessa Kvist, Bjarløv, Søren Peter, and Peuhkuri, Ruut
- Abstract
An inevitable measure when energy retrofitting historic buildings in Europe, is the reduction of building envelope heat loss. On preservation-worthy facades where external insulation is not an option, installation of internal insulation is gaining pace. The historic buildings in Denmark are often constructed with solid masonry facades and wooden decks. The internal insulation may, however, entail potential hygrothermal risks in walls and embedded wood. Measures such as vapour barriers and capillary active insulation materials are continuously evolving and the subject of much current research. The hygrothermal conditions are of great importance for the durability of the building constructions, and for the health and wellbeing of occupants. Wind-driven rain (WDR) is a central factor contributing to water penetration and moisture loads of the exterior walls. Numerous studies have shown that WDR loads influence the moisture conditions in masonry walls and embedded wooden beams, and can even affect interior relative humidity. In the present paper WDR loads on existing façades in a cold temperate climate were determined by measurements and compared to a semi-empirical model. Simultaneously, the hygrothermal conditions within internally insulated walls with exposed brick and embedded wooden beams were monitored. Furthermore, numerical simulations were implemented for clarification of WDR impact. Hygrothermal simulations and previous studies, inevitably show that high WDR loads result in higher moisture content behind the interior insulation. Results from the field measurements of WDR however, cannot directly be referred to the moisture content measured in walls behind interior insulation or beam ends. However, fluctuations in external air humidity proved to be influential on condiditons in the construction. Implementation of a semi-empirical model for calculations of WDR agreed with previous studies in predictions being too conservative when compared to measured WDR.
- Published
- 2019
17. The effects of wind-driven rain on the hygrothermal conditions behind wooden beam ends and at the interfaces between internal insulation and existing solid masonry
- Author
-
Hansen, Tessa Kvist, primary, Bjarløv, Søren Peter, additional, and Peuhkuri, Ruut, additional
- Published
- 2019
- Full Text
- View/download PDF
18. Material characterization models and test methods for historic building materials
- Author
-
Hansen, Tessa Kvist, Peuhkuri, Ruut Hannele, Møller, Eva B., Bjarløv, Søren Peter, Odgaard, Tommy, Hansen, Tessa Kvist, Peuhkuri, Ruut Hannele, Møller, Eva B., Bjarløv, Søren Peter, and Odgaard, Tommy
- Abstract
Predictions of long term hygrothermal performance can be assessed by dynamic hygrothermal simulations, in which material parameters are crucial input. Material parameters for especially historic materials are often unknown; therefore, there is a need to determine important parameters, and simple ways for estimation of these. A case study of a brick wall was used to create and validate a hygrothermal simulation model; a parameter study with five different parameters was performed on this model to determine decisive parameters. Furthermore, a clustering technique has been proposed to estimate decisive parameters through simple testing of interrelated parameters that are easier to determine.
- Published
- 2017
19. Energy Efficient Comfort in Older Apartment Blocks: Results and Experience
- Author
-
Harrestrup, Maria, Hansen, Tessa Kvist, Haferbier, Rune, Lange, Jørgen, Pedersen, Leif Rønby, and Karkov, Rasmus
- Published
- 2016
20. Moisture transport properties of brick – comparison of exposed, impregnated and rendered brick
- Author
-
Hansen, Tessa Kvist, Bjarløv, Søren Peter, Peuhkuri, Ruut, Hansen, Tessa Kvist, Bjarløv, Søren Peter, and Peuhkuri, Ruut
- Abstract
In regards to internal insulation of preservation worthy brick façades, external moisture sources, such as wind-driven rain exposure, inevitably has an impact on moisture conditions within the masonry construction. Surface treatments, such as hydrophobation or render, may remedy the impacts of external moisture. In the present paper the surface absorption of liquid water on masonry façades of untreated, hydrophobated and rendered brick, are determined experimentally and compared. The experimental work focuses on methods that can be applied on-site, Karsten tube measurements. These measurements are supplemented with results from laboratory measurements of water absorption coefficient by partial immersion. Based on obtained measurement results, simulations are made with external liquid water loads for determination of moisture conditions within the masonry of different surface treatments. Experimental results showed a very clear reduction of the liquid water uptake for hydrophobated cases. However, hygrothermal simulations demonstrated clear differences in the effect of the surface treatments on the moisture content of brick depending on the brick type.
- Published
- 2016
21. A lime based mortar for thermal insulation of medieval church vaults
- Author
-
Larsen, P.K., Hansen, Tessa Kvist, Larsen, P.K., and Hansen, Tessa Kvist
- Abstract
A new mortar for thermal insulation of medieval church vaults was tested in a full scale experiment in Annisse Church, DK. The mortar consists of perlite, a highly porous aggregate, mixed with slaked lime. These materials are compatible with the fired clay bricks and the lime mortar joints. The lambda-value of the insulation mortar is 0.08 W/m K or twice the lambda-value for mineral wool. The water vapour permeability is equal to a medieval clay brick, and it has three times higher capacity for liquid water absorption. The mortar was applied to the top side of the vaults in a thickness of 10 cm, and covered by 10 mm lime plaster, reinforced with cattle hair. This assembly can carry the weight of a person, working with maintenance of the roof. Climate measurements confirmed excellent properties in regards to both moisture transport and thermal insulation. Condensation did not occur at any time, despite a water vapour pressure gradient up to 500 Pa between the nave and attic. There was no reduction in energy consumption the first winter, possibly due to the increased heat loss related to the drying of the mortar.
- Published
- 2016
22. A lime based mortar for thermal insulation of medieval church vaults
- Author
-
Hansen, Tessa Kvist, Larsen, Poul Klenz, Hansen, Kurt Kielsgaard, Bjarløv, Søren Peter, Peuhkuri, Ruut Hannele, Hansen, Tessa Kvist, Larsen, Poul Klenz, Hansen, Kurt Kielsgaard, Bjarløv, Søren Peter, and Peuhkuri, Ruut Hannele
- Abstract
There are 1700 medieval churches in Denmark, and many of these have brick vaults. The thickness is only 12 – 15 cm, and the heat loss through this building component is large. Thermal insulation has not been permitted until now in respect for the antiquarian values and doubts about the effect on water vapour transport through the vault, and the risk of condensation inside the insulation. A new mortar was developed for thermal insulation of bricks vaults, consisting mainly of expanded perlite, mixed with slaked lime. These materials are compatible with the fired clay bricks and the lime mortar joints. The insulation mortar is applied to the top side of the vault in a thickness of 10 cm, and covered by 10 mm lime plaster, reinforced with cattle hair. This assembly is resistant to the weight of a person, working with maintenance of the roof. The thermal conductivity of the insulation mortar was measured to 0.08 W/mK, which is twice the value for mineral wool. It has 1/3 of the resistance to water vapour diffusion as brick, and a high capacity for liquid water absorption. This is a benefit in the case of rain leaking from the roof, because the water does not penetrate further down into the bricks.
- Published
- 2016
23. Hansen, Tessa Kvist
- Author
-
Hansen, Tessa Kvist and Hansen, Tessa Kvist
- Published
- 2015
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.