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Special Issue "Heat and Mass Transfers Modelling with Applications in Energy Efficiency in Buildings"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "G: Energy and Buildings".

Deadline for manuscript submissions: closed (25 September 2021) | Viewed by 3807

Special Issue Editor

Department of Civil and Mechanical, University of La Rochelle, LaSIE UMR CNRS 7356, 17000 La Rochelle, France
Interests: heat and mass transfer; porous media; building energy performance; urban microclimate
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The coupled heat and moisture transfer in porous building materials and in building topics represents a major social concern related to the improvement of the living environment of buildings through the use of low-energy solutions with a low environmental footprint. Indeed, the current thermal regulations recommend the design of buildings to be more thermally insulated with a very low permeability. Despite the limitations of the energy and environmental impact, these regulations also lead to new issues, as they may affect summer comfort and indoor air quality. Another consequence is the deterioration of these "hermetic" buildings because of the presence of humidity inside the living environment. Thus, the presence of water (in vapor and liquid phases) is responsible for fungal growth and the degradation of plant-based insulation. Moreover, it is the transport vector for aggressive agents such as chlorides and sulphates, and the site of chemical reactions such as carbonation. Hitherto, neglected second-order phenomena have become increasingly important, to the extent that they make a significant contribution to the overall heat balance of buildings and cannot be neglected anymore. Moisture transfer is a significant issue. In addition, the use of materials with a low environmental impact, such as eco-materials, bio-sourced materials, and recycled materials, is hindered, in particular through the non-availability of databases related to their intrinsic properties and from a lack of knowledge about their behavior over time.

This Special Issue deals with heat and moisture transfer at different scales: from the microstructure, to material and building scales. It covers not only the aspects related to the numerical and experimental modeling of the transfer mechanisms at both microscopic and macroscopic scales, as well as numerical and experimental phenomenological modeling at the material scale, but also contributions associated with the characterization of the properties of building materials, eco-materials, and bio-based materials, namely: microstructural, mechanical, thermal, and hydric. All original works applied to the evaluation of the energy performances of buildings and the reduction of environmental impacts are also welcomed.

Prof. Dr. Rafik Belarbi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Heat and Moisture Transfer (HMT)
  • Bio-based Materials
  • Buildings Energy Performance
  • Environmental Footprint
  • Indoor Air Quality
  • Hysteresis
  • Aging Material Properties
  • Multiscale Modelling

Published Papers (2 papers)

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Research

16 pages, 6770 KiB  
Article
Hygrothermal and Mechanical Behaviors of Fiber Mortar: Comparative Study between Palm and Hemp Fibers
Energies 2021, 14(21), 7110; https://doi.org/10.3390/en14217110 - 01 Nov 2021
Cited by 7 | Viewed by 1550
Abstract
This paper presents an experimental investigation of the hygrothermal and mechanical properties of innovative mortar mixtures reinforced with natural fibers. Fibers extracted from palm stems (PS) and hemp (HF) were evaluated at different percentages. Scanning electron microscope (SEM) observations showed that the PS [...] Read more.
This paper presents an experimental investigation of the hygrothermal and mechanical properties of innovative mortar mixtures reinforced with natural fibers. Fibers extracted from palm stems (PS) and hemp (HF) were evaluated at different percentages. Scanning electron microscope (SEM) observations showed that the PS fibers have rough surfaces and very complex microstructures. Prior to their incorporation into the mortar, the fibers were subjected to different treatments to reduce their hydrophilic character. The employed treatments showed good efficiency in reducing the water absorption of both PS and HF fiber types. Furthermore, the mortar mixtures incorporating these fibers exhibited low thermal conductivity and excellent moisture buffering capacity. Indeed, the moisture buffer value (MBV) of the investigated mixtures ranged between 2.7 [g/(%HR·m2)] and 3.1 [g/(%HR·m2)], hence providing them excellent moisture regulator character. As expected, the fiber mortar mixtures showed very high porosity and low compressive strength ranging between 0.6 and 0.9 MPa after 28 days of age. The low-environmental footprint materials developed in this study are intended for thermal insulation and building filling. Full article
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19 pages, 11251 KiB  
Article
Accelerated Aging Effects on the Hygrothermal Behaviour of Hemp Concrete: Experimental and Numerical Investigations
Energies 2021, 14(21), 7005; https://doi.org/10.3390/en14217005 - 26 Oct 2021
Cited by 7 | Viewed by 1357
Abstract
In this article, both numerical and experimental investigations were carried out on the durability of hemp concrete. For this, an accelerated aging process was performed using cycles of immersion, freezing and drying. Then, an experimental campaign was enabled to determine heat and mass [...] Read more.
In this article, both numerical and experimental investigations were carried out on the durability of hemp concrete. For this, an accelerated aging process was performed using cycles of immersion, freezing and drying. Then, an experimental campaign was enabled to determine heat and mass transfer properties, as well as the microstructure for both aged and reference materials. Observations using a digital microscope showed the appearance of cracks at the interfaces and an increase of the porosity of about 6%. These microstructural modifications imply a non-negligible evolution of heat and mass transfer properties. Thus, a numerical model for the prediction of heat and mass transfer was developed. The prediction of physical phenomena was computed using both aged and reference material properties. It highlights the aging effects on the behaviour of the hemp concrete. The numerical simulation results showed significant discrepancies between the predicted relative humidity values for the two configurations (aged and reference) of about 18% and a maximum phase shift of 40 min, due to the amplification of the mass transfer kinetics after aging. Nevertheless, few deviations in temperature values were found. Thus, after aging, sensible heat fluxes were overestimated compared to the reference case, unlike latent heat fluxes, where an underestimation was shown. Full article
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