How much heat is required to convert \(4 \mathrm{~kg}\) of water at \(20^{\circ} \mathrm{C}\) into steam at \(8 \mathrm{bar}\) and \(200^{\circ} \mathrm{C}\). Take \(c_{p s}=2.1 \mathrm{~kJ} / \mathrm{kg} . K\) and \(c_{p w}=4.187 \mathrm{~kJ} / \mathrm{kg} . \mathrm{K}\).