1
\begin{equation}
\eta_{TEG}=\frac{P_{elec}}{\dot{\mathrm{m}} C_{p ex}\left(T_{in}-T_{out})\right}
\label{eq:tege}
\end{equation}
  • 1
    you need a delimiter after \right either \right) or \right. if you want nothing – David Carlisle May 3 '19 at 7:50
  • 1
    but you do not want \left or \right as there is no need to stretch the delimiters so just use (...) – David Carlisle May 3 '19 at 7:51
1

You have written

\left(...)\right

but the correct syntax is

\left(...\right)

However, in your particular case such rescaling of brackets is completely unnecessary.

Sample output

\documentclass{article}

\begin{document}
\begin{equation}
\eta_{\mathrm{TEG}}=\frac{P_{\mathrm{elec}}}{\dot{\mathrm{m}} C_{p\,\mathrm{ex}}\left(T_{\mathrm{in}}-T_{\mathrm{out}}\right)}
=\frac{P_{\mathrm{elec}}}{\dot{\mathrm{m}} C_{p\,\mathrm{ex}}(T_{\mathrm{in}}-T_{\mathrm{out}})}
\label{eq:tege}
\end{equation}
\end{document}

Incidentally, I have made most of your subscripts \mathrm, but do not have enough context to know whether this is appropriate for the C_{p ex}. If there really is a space in this subscript, then probably you want a thin space \, before the C too.

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