A heat exchanger cools and condenses $100$ te $h^{-1}$ of oil vapour at $300C($enthalpy $600kJk{g}^{-1})$ to a liquid at $50C($enthalpy $100kJk{g}^{-1})$ using cooling water which enters at $10C$ and must not rise above $20C.$ Ignoring heat losses, what is the minimum water consumption?

$[1194\mathrm{.}2$ te$/$h$]$