scholarly journals A Procedure to Measure the in-Situ Hygrothermal Behavior of Earth Walls

Materials ◽  
2014 ◽  
Vol 7 (4) ◽  
pp. 3002-3020 ◽  
Author(s):  
Pierre-Antoine Chabriac ◽  
Antonin Fabbri ◽  
Jean-Claude Morel ◽  
Jean-Paul Laurent ◽  
Joachim Blanc-Gonnet
Solar Energy ◽  
2017 ◽  
Vol 141 ◽  
pp. 70-80 ◽  
Author(s):  
Lucile Soudani ◽  
Monika Woloszyn ◽  
Antonin Fabbri ◽  
Jean-Claude Morel ◽  
Anne-Cécile Grillet

2018 ◽  
Vol 22 (Suppl. 4) ◽  
pp. 1143-1155
Author(s):  
Vesna Lovec ◽  
Milica Jovanovic-Popovic ◽  
Branislav Zivkovic

The conducted research examines the thermal behaviour of the rammed earth walls, which is the basic structural and fa?ade element of traditional Vojvodina house. The traditional rammed earth house represents an important part of the total building stock of Vojvodina. Earth is a locally available, cheap, natural, environmentally friendly building material and has been used extensively for traditional family houses in Vojvodina. It has ecological and ?green? characteristics, which can be assessed as very high quality, and they are of significant importance in the context of sustainable development and striving to reduce energy consumption today. The research examines thermal behaviour of rammed earth wall, including theoretical analysis of: the heat transfer coefficient, U, the thermal resistance, R, and thermal conductivity, ?. One of the basic elements of thermal behaviour, the thermal mass, has been analyzed both theoretically and by measuring in situ. The in situ measurements were conducted on the traditional house in Vojvodina by measuring inside and outside surface wall and air temperature in summer. Analyses of rammed earth wall thermal performances have shown that the wall has low thermal conductivity, high heat capacity and significant thermal mass effect which is the key element enabling thermal stability. The research indicates rather good thermal properties of the rammed earth walls. Potential of rammed earth wall in Vojvodina should be an issue of further analysis, although the possibility of improvement of existing facilities to meet current standards in terms of energy efficiency should be considered.


2016 ◽  
Vol 824 ◽  
pp. 235-242 ◽  
Author(s):  
David Bečkovský ◽  
František Vlach ◽  
Jan Vitík ◽  
Eva Šuhajdová

This article deals with the assessment of methodologies for water vapor condensation determination and mold growth risk analysis on the surfaces of an organic building structure based on in-situ monitoring, carried out on the structural elements of renovated roof truss above the greenhouse “Květná zahrada” in Kroměříž. The garden including the building is signed on the UNESCO Word Heritage List for its historical and architectonical value. The monitoring was focused on hygrothermal behavior of a particular attic area during winter term 2014 - 2015. The risks of water vapor condensation and mold growth were then analyzed on the basis of data obtained by the monitoring process. These also include measurement and output data accuracy is included as well. The Results were used as recommendation for a control system of forced ventilation in the monitored attic area.


Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2950 ◽  
Author(s):  
Mirco Andreotti ◽  
Marta Calzolari ◽  
Pietromaria Davoli ◽  
Luisa Dias Pereira ◽  
Elena Lucchi ◽  
...  

The main purpose of the HeLLo project is to contribute to data available on the literature on the real hygrothermal behavior of historic walls and the suitability of insulation technologies. Furthermore, it also aims at minimizing the energy simulation errors at the design phase and at improving their conservation features. In this framework, one of the preliminary activities of the study is the creation of a real in situ hot box to measure and analyze different insulation technologies applied to a real historic wall, to quantify the hygrothermal performance of a masonry building. Inside this box, ‘traditional’ experiments can be carried out: recording heat flux, surface temperature, and air temperatures, as well as relative humidity values through the use of a new sensing system (composed of thermocouples and temperature/relative humidity combined sensors). Within this paper, the process of development, construction, and validation of this new metering box is exhibited. The new hot box, specifically studied for historic case studies, when compared to other boxes, presents other advantages compared to previous examples, widely exemplified.


Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 635
Author(s):  
Miguel Ángel Mellado Mascaraque ◽  
Francisco Javier Castilla Pascual ◽  
Víctor Pérez Andreu ◽  
Guillermo Adrián Gosalbo Guenot

This paper describes the influence of thermal parameters—conductivity, transmittance, and thermal mass—in the estimation of comfort and energy demand of a building with rammed earth walls, and consequently, the compliance with standards. It is known that nominal design data does not match in situ measured values, especially in traditionally constructed buildings. We have therefore monitored a room in a building with rammed earth walls, designed a computerised model, and compared four different alternatives where we have changed the value for the thermal conductivity (in situ vs. estimated) and the consideration of thermal mass. When we then analyse the compliance with the Spanish energy saving code, using measured values would result in lower differences with the standards’ limits and even comply with the global thermal transmittance (K-value) requirement. This would mean a more realistic approach to the restoration of traditional buildings leading to the use of thinner and more suitable insulation and retrofitting systems, encouraging the use of rammed earth in new buildings, and therefore reducing the carbon footprint due to materials used in construction. Results show that the building model that uses in situ values and considers thermal mass (S1) is closer to reality when assessing thermal comfort. Finally, using nominal data would result in requiring 43% more energy in the selected winter period and 102% more energy in the selected summer period to keep the same comfort conditions as in the alternative where measured values are used.


2014 ◽  
Vol 1041 ◽  
pp. 269-272
Author(s):  
Richard Slávik ◽  
Miroslav Čekon

The paper presents an analysis of indoor temperature and relative humidity measurements in dwelling's bathroom. Obtained data are compared with those defined in technical standards and applied for assessment of building component from building physics point of view. These parameters are used for boundary condition at the evaluation level of building components and their values have significant influence on hygrothermal assessment. The example of building's component demonstrates analysis magnitude of differences between the calculation results applying standardized boundaries condition and monitored data based on in-situ measurements. Temperature and humidity measurements are applied for prediction of hygrothermal behavior of building’s component by HAM algorithm. Finally, results from analysis presents the penetration depth of moisture increasing at surface caused by moisture peaks in internal environment of bathroom.


2017 ◽  
Vol 21 ◽  
pp. 460-467
Author(s):  
Marouen Slaimia ◽  
Naima Belayachi ◽  
Dashnor Hoxha

The purpose of this study is to evaluate the potential of bio-sourced material based on cereal straw for an efficient insulation. Decreasing significantly energy consumption of buildings requires not only the very best insulation material for heat loss reduction through the wall but also the reduction of air permeability which can affect automatically the comfort in the building. This is why, propose an insulation material with low thermal conductivity remains insufficient and the evaluation of the performance of the new insulation material in situ in real conditions is an essential step. The experimental building ( PROMETHE demonstrator) is set up with wood frame and multilayered walls composed with cinder blocks and insulation bio-composite based on cereal straw in order to simulate the thermal rehabilitation conditions according the External thermal insulation principle. Each façade is divided in four part with three different insulation bio-composites and naked part for comparison reasons. Hygrothermal sensors are used both inside and outside of the demonstrator, and heat-flux sensor is placed at the cinder blocks biocomposite interface. These in situ measurements are used to compare the efficiency of three bi-sourced materials and for the modeling the hygrothermal behavior of the multilayer wall by using the set of identified parameters in laboratory.


1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.


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