\documentclass{article} \usepackage[stdsubgroups,nocfg]{nomencl} \usepackage{setspace} \makenomenclature \begin{document} \section*{Main equations} Here an equation \begin{equation}\label{eq:heatflux} \dot{Q} = k \cdot A \cdot \Delta T \end{equation}% \nomenclature[aQ]{$\dot{Q}$}{heat flux}% \nomenclature[ak]{$k$}{overall heat transfer coefficient}% \nomenclature[aA]{$A$}{area}% \nomenclature[aL]{$L$}{length}% \nomenclature[aT]{$T$}{temperature}% \nomenclature[aT]{$\Delta T$}{temperature difference}% or another one \begin{equation}\label{eq:ohtc} \frac{1}{k} = \left[\frac{1}{\alpha _{\mathrm{i}}\,r_{\mathrm{i}}} + \sum^n_{j=1}\frac{1}{\lambda _j}\, \ln \frac{r_{\mathrm{a},j}}{r_{\mathrm{i},j}} + \frac{1}{\alpha _{\mathrm{a}}\, r_{\mathrm{a}}}\right] \cdot r_{\mathrm{reference}} \end{equation}% \nomenclature[ga]{$\alpha$}{convection heat transfer coefficient}% \nomenclature[zi]{i}{in}% \nomenclature[gl]{$\lambda$}{thermal conductivity}% \nomenclature[za]{a}{out}% \nomenclature[zn]{$n$}{number of walls}% \nomenclature[zj]{$j$}{running parameter}% \onehalfspacing \printnomenclature \end{document}