Hygrothermal behaviour of straw bale walls: experimental tests and numerical analyses

Abstract

Straw is an organic material with hygroscopical properties. The high capacity it has of storing moisture from the surroundings can furthermore influence the performance and lead to the possible degradation of the material thereof. The aim of this study was to assess the conductance C-value of a complex material such as straw. A climatic chamber was used to study a sample, which reproduces a traditional plastered straw bale wall. Tests were conducted under different boundary conditions, setting constant values for temperatures and relative humidity. The revision of the assessment's results allowed the calculation of conductance and conductivity values under different conditions. A numerical model was then designed starting from the laboratory data, which was used to characterize material properties. The match between software simulations and laboratory analyses will be a starting point for further tests. Determining the straw conductance C-value is a difficult task to achieve, due to the complexity and the unique properties of the material. In spite of all this, laboratory tests have shown encouraging results, which reflect the great potential of straw as a building material.

Production and characterization of briquettes made from rice straw and sawdust under high pressure and high temperature conditions

“…It is due to the structure of the paddy straw in two forms. The chopped straw retained more moisture due to its open pore structure (Mesa & Arenghi, 2019). The shredded straw had thread-like filaments and hence offered little moisture-holding capability.…”

On the thermal performance of naturally ventilated room with straw insulation retrofitted envelope for different climatic zones of India

“…Various attributes of straw buildings namely structural [26], moisture infiltration [30][31] [32], fire, and sound resistance [24][19] [33] have been explored.…”

A Mini-Review on Straw Bale Construction

“…Depending on the wall structure and the materials' thickness, the resulting U-values mostly range from 0.11 [44] to 0.28 W/m 2 K [40], which is lower than that of building walls using conventional materials such as concrete or bricks. Several researchers [42,[45][46][47] experimentally noted the ability of straw walls to reduce and time shift the variations of outdoor temperature and RH. Most found time lags and decrement factors of value 6-12 h and 0.01-0.08%, respectively [38,48].…”