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Measurement of Thermal Properties of Biosourced Building Materials

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Abstract

This paper presents both experimental and theoretical works concerning the evaluation of the thermal conductivity and thermal diffusivity of hemp concrete. Experimental measurements of thermal properties are performed using a hot-strip technique for temperatures ranging from \(-\)3 \(^{\circ }{\text{ C }}\) to 30 \(^{\circ }{\text{ C }}\) and relative humidities ranging from 0 % to 95 %, thus creating a large database for this material. These experimental thermal conductivities are then compared with the results from the Krischer theoretical predictive model. The comparison shows good agreement, and a predictive analytical relation between the hemp concrete thermal conductivity, temperature, and relative humidity is determined.

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Abbreviations

\(a\) :

Thermal diffusivity (\({\text{ m }}^{2}\cdot {{\text{ s }}^{-1}}\))

\(b\) :

Hot-strip halfwidth (m)

\(c_{p}\) :

Specific heat (\({\text{ J }}\cdot {\text{ kg }}^{-1}\cdot {{\text{ K }}^{-1}}\))

\(mc_{\mathrm{hs}}\) :

Specific heat capacity (\({\text{ J }}\cdot {{\text{ K }}^{-1}}\))

\(p\) :

Laplace parameter

\(t\) :

Time (s)

\(t_{\mathrm{c}}\) :

Critical time (s)

\(u_{n}\) :

Transcendental solutions (\({\text{ m }}^{-1}\))

\(x,y,z\) :

Cartesian coordinates

\(w\) :

Water content (\({\text{ kg }}\cdot {\text{ kg }}^{-1}\))

\(w_{0}\) :

GAB’s model coefficient (\({\text{ kg }}\cdot {{\text{ kg }}^{-1}}\))

\(I\) :

Current (A)

\(C\) :

GAB’s model coefficient

\(E\) :

Thermal effusivity (\({\text{ J }}\cdot {\text{ m }}^{-2}\cdot {\text{ K }}^{-1}\cdot {{\text{ s }}^{-1/2}}\))

\(H\) :

Sample height (m)

\(K\) :

GAB’s model coefficient

\(L\) :

Sample halfwidth (m)

\(N\) :

Norm

\(R_{\mathrm{c}}\) :

Contact resistance (\({\text{ K }}\cdot {{\text{ W }}^{-1}}\))

\(RH\) :

Relative humidity (%)

\(S\) :

Saturation

\(S_{\mathrm{c}}\) :

Contact surface area (\({\text{ m }}^{2}\))

\(T\) :

Temperature (\(^{\circ }{\text{ C }}\) or K)

\(U\) :

Voltage (V)

\(X\) :

Reduced sensitivity

\(\alpha _{n}\) :

Eigenvalue

\(\beta _{i}\) :

Parameter

\(\varepsilon \) :

Porosity

\(\theta \) :

Laplace space temperature (\(^{\circ }{\text{ C }}\) or K)

\(\lambda \) :

Thermal conductivity (\({\text{ W }}\cdot {{\text{ m }}^{-1}}\cdot {\text{ K }}^{-1}\))

\(\rho \) :

Density (\({\text{ kg }}\cdot {{\text{ m }}^{-3}}\))

\(\varphi \) :

Laplace space flux (W)

\(\psi \) :

Eigenfunction

\(\phi \) :

Time space flux (W)

a:

Dry air

c:

Contact

eff:

Effective

exp:

Experimental

hs:

Hot-strip

s:

Solid

w:

Moisture (liquid and vapor phases)

\(\bot \) :

Orthogonal

//:

Parallel

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Acknowledgments

The authors would like to thank the European Union for the equipment co-financing through the European Regional Development Fund.

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Authors and Affiliations

  1. Laboratoire d’Ingénierie des MATériaux de Bretagne (LIMATB)—EA4250, Université de Bretagne-Sud, Université Européenne de Bretagne, Rue de Saint Maudé, BP 92 116, 56 321 , Lorient Cedex, France

    Thomas Pierre, Thibaut Colinart & Patrick Glouannec

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  1. Thomas Pierre
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  2. Thibaut Colinart
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Correspondence to Thomas Pierre.

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Pierre, T., Colinart, T. & Glouannec, P. Measurement of Thermal Properties of Biosourced Building Materials. Int J Thermophys 35, 1832–1852 (2014). https://doi.org/10.1007/s10765-013-1477-0

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