Experimental studies of the thermo and humidity state of a new building facade insulation system based on panels with ventilated channels

Низовцев, М. И.; Letushko, V. N.; Borodulin, V. Yu; Sterlyagov, A. N.

doi:10.1016/j.enbuild.2019.109607

Cited by 29 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies assess the energy saving potential of these façades through their insulation characteristics [32][33][34] and its hygrothermal performance and moisture control [35,36]. Other studies perform both experimental and numerical analyses to characterize the airflow in the ventilated façades [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

View full text Add to dashboard Cite

Commercial and residential building is one of the four major final energy consumption and end-use sectors. In this sector, cooling loads represent an important part of the energy consumption, and therefore, they must be minimized, improving the energy efficiency of buildings. Ventilated façades are one of the most widely used passive elements that are integrated into buildings, precisely with the aim of reducing these loads. This reduction is due to the airflow induced in the air cavity by the buoyancy forces, when the solar radiation heats the outer layer of the façade. In the open joint ventilated facades (OJVF), ventilation is attained through the open joints between the panels composing the outer layer. Despite the steadily growing research in the characterization of this type of system, few studies combine the numerical modelling of OJVF with experimental results for the assessment of the airflow in the ventilated cavities. This paper experimentally validates a numerical simulation model of an OJVF. Firstly, the façade performance has been experimentally assessed in a laboratory model determining the temperatures in the panels and air gap and measuring the flow field at the gap using particle image velocimetry (PIV) techniques. Secondly, a numerical model has been developed using advanced Computational Fluid Dynamics (CFD) simulation tools. Finally, an experimental validation of the numerical model has been done. Experimental and numerical results are compared in different planes inside the ventilated cavity. The discrete ordinates (DO) radiation model and the k-ε renormalisation group (RNG) turbulence model better adjust the simulated results to the experimental ones.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In none of the types belonging to the category "Facade 2-ventilated" has condensation been found. In these cases the ventilated cavity itself is responsible for evaporating any water vapour that may pass through the enclosure [48], and therefore the type B sheet is very permeable o water vapour.…”

Section: Discussionmentioning

confidence: 99%

Influence of the Water Vapour Permeability of Airtight Sheets on the Behaviour of Facade

et al. 2020

View full text Add to dashboard Cite

The air-tightness of the thermal envelope of buildings is one of the measures to reduce their energy demands in order to achieve global warming reduction targets. To this end, airtight sheets with different water vapour permeability characteristics are used. The different products studied are highly dispersed in terms of equivalent air thickness values, leading to confusion. After the analysis carried out, it is concluded that all airtight sheets are vapour barriers. To clarify whether or not these sheets are necessary as vapour barriers, a condensation analysis was carried out on 13 different facades for 3 climate zones with severe winters as defined in Spanish regulations. The results reveal that interstitial condensation occurs in only 7 of the 39 case studies, with the traditional facades of brickwork with render causing the greatest problems if the appropriate products are not used. In these cases, airtight sheets with water vapour barrier characteristics must be applied on the interior face of the insulating material. In all other cases (32), the airtight sheets must be permeable to water vapour if it is looked for a more breathable wall to water vapour and a better control of the interior humidity conditions.

show abstract

“…In this experiment, the samples were arranged in desiccators with various salt solutions to achieve different values of relative humidity required to the material description, thus the mass of samples was measured in specified periods until steady-state values of mass were achieved. Subsequently, the moisture content w (m 3 •m −3 ) was calculated and the w = w(ϕ) functions for particular plasters, i.e., the sorption isotherms were plotted [35].…”

Section: Determination Methodsmentioning

confidence: 99%

“…Consequently, many types of thermal insulation materials were used to improve the thermal performance of building envelopes and fulfill challenging criteria [1]. Unfortunately, the application of thermal insulation materials resulted in substantial airtightness of buildings [2][3][4]. Besides the thermal performance of building envelopes, the moderation of the interior level of relative humidity became an important issue in order to achieve and preserve sufficient quality of indoor air [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

et al. 2020

View full text Add to dashboard Cite

Moisture loads in building interiors are accompanied by a deterioration of the indoor air quality. Such a phenomenon may induce serious health risks for building inhabitants as well as degradation of furnishing. Unfortunately, the employment of additional heat, ventilation and air conditioning (HVAC) devices does not comply with the sustainability principle due to increased energy consumption, thus cannot be viewed as an efficient solution. This study deals with the use of superabsorbent polymers (SAP) in cement-lime plasters, thus extends the current state of knowledge and outlines further possible development of novel moisture responsive plasters since lightweight aggregates do not provide the desired performance. To be specific, this paper contemplates the experimental analysis of novel plasters modified by 0.5, 1 and 1.5 wt. % of SAP to obtain input parameters for computational modeling. Based on the obtained outputs, the incorporation of SAP admixture resulted in a substantial increase in moisture transport properties including the water absorption coefficient and water vapor diffusion properties. The performed computational modeling revealed a considerable reduction of relative humidity fluctuations, thus mitigation of potential health issues associated with undesired moisture content in building interiors. Achieved results indicate that the SAP enhanced plasters have substantial passive moisture buffering performance and thus may contribute to the improvement of indoor air quality.

show abstract

Experimental studies of the thermo and humidity state of a new building facade insulation system based on panels with ventilated channels

Cited by 29 publications

References 27 publications

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Influence of the Water Vapour Permeability of Airtight Sheets on the Behaviour of Facade

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

Contact Info

Product

Resources

About