# Thermal Effusivity Tester (TET)--A New Device to Determine Thermal Effusivity of Textiles
## 3 Materials & Results  
All fabric samples were provided by Lenzing AG and represent common fabric types used for textile applications. In the first comparison, fabrics with different common constructions and fiber contents were tested. Thermal conductivity and thermal effusivity were measured by TET and compared with available data from TCi (4 samples) and Alambeta (all). Fabric characteristics can be found in Table 1. Results for thermal conductivity and effusivity are presented in Tables 2 and 3. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample No.**} & \multirow{2}{*}{**Composition**} & \multirow{2}{*}{**Construction**} & \multirow{2}{*}{**Weight** **(g/m\({}^{2}\))**} & \multicolumn{2}{c}{**Thickness**} \\  & & & & **(\(\mu\)m)** \\ \hline \multirow{2}{*}{1} & \multirow{2}{*}{100\% Cotton} & Interlock (knit) & \multirow{2}{*}{170} & \multirow{2}{*}{780} & \multirow{2}{*}{750} \\  & & & & & \\ \hline
2 & 65\% Polyester/35\% Cotton & Plain weave (woven) & 231 & 440 & 440 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Composition and construction properties of the textiles tested on Alambeta, TCI and TET. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample No. **} & \multirow{2}{*}{**Composition**} & \multirow{2}{*}{**Construction**} & \multicolumn{2}{c}{**Alambeta**} & \multicolumn{2}{c}{**TGi**} & \multicolumn{2}{c}{**TET**} \\ \cline{3-8}  & & & \multicolumn{1}{c}{**Thermal**} & \multicolumn{1}{c}{**CV**} & \multicolumn{1}{c}{**Conductivity**} & \multicolumn{1}{c}{**Conductivity**} & \multicolumn{1}{c}{**CV**} & \multicolumn{1}{c}{**Thermal**} & \multicolumn{1}{c}{**Conductivity**} & \multicolumn{1}{c}{**CV**} \\  & & & **(W/m*K)** & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} & \multicolumn{1}{c}{**(W/m*K)**} \\ \hline \multirow{2}{*}{1} & \multirow{2}{*}{100\% Cotton} & Interlock (knit) & \multirow{2}{*}{0.036} & \multirow{2}{*}{2.8} & \multirow{2}{*}{0.073} & \multirow{2}{*}{1.8} & \multirow{2}{*}{0.045} & \multirow{2}{*}{4.3} \\ \hline \multirow{2}{*}{2} & \multirow{2}{*}{65  
In a second comparison, a set of woven and knitted fabrics made of different cellulosic fibers was measured using TET, and the results were compared with Qmax values as obtained by Kawabata KES-f Thermo Labo. Fabric characteristics. The results are shown in Table 4. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{
\begin{tabular}{c} **Sample** \\ **No.** \\ \end{tabular} } & \multirow{2}{*}{**Composition**} & \multirow{2}{*}{**Construction**} & \multirow{2}{*}{**Effusivity** **(Ws1/2/m2 K)**} & \multirow{2}{*}{**CV** **(\%)**} & \multirow{2}{*}{**Effusivity** **(Ws1/2/m2 K)**} & \multirow{2}{*}{**CV** **(\%)**} & \multirow{2}{*}{**Effusivity** **(Ws1/2/m2 K)**} & \multirow{2}{*}{**CV** **(\%)**} \\  & & & & **(Ws1/2/m2 K)** & & & \\ \hline
3 & \
\begin{tabular}{c} 65\% Polyester/35\% \\ Cotton \\ \end{tabular} &
\begin{tabular}{c} Plain weave \\ (woven) \\ \end{tabular} & 210 & 2.8 & 228 & 0.4 & 228 & 4.6 \\ \hline
4 & 100\% Polyester &
\begin{tabular}{c} Jaquard weave \\ (woven) \\ \end{tabular} & 165 & 3.0 & 176 & 0.7 & 174 & 2.9 \\ \hline
5 & 100\% Cotton &
\begin{tabular}{c} Plain weave \\ (woven) \\ \end{tabular} & 184 & 1.9 & - & - & 181 & 3.1 \\ \hline
6 & 100\% Lyocell &
\begin{tabular}{c} Plain weave \\ (woven) \\ \end{tabular} & 192 & 5.0 & - & - & 195 & 4.7 \\ \hline
7 & 100\% Cotton &
\begin{tabular}{c} Single jersey \\ (knit) \\ \end{tabular} & 141 & 6.2 & - & - & 136 & 4.6 \\ \hline
8 & \
\begin{tabular}{c} 95\% Modal/ \\ 5\% Elastane \\ \end{tabular} &
\begin{tabular}{c} Single jersey \\ (knit) \\ \end{tabular} & 164 & 11.7 & - & - & 187 & 3.0 \\ \hline
9 & \
\begin{tabular}{c} 57\% Lyocell/ \\ 43\% Polyester \\ \end{tabular} &
\begin{tabular}{c} Interlock \\ (knit) \\ \end{tabular} & 158 & 2.9 & - & - & 148 & 4.8 \\ \hline \hline \end{tabular}
\end{table}