Physics - Heat & Thermo Question with Solution | TestHub

In an industrial process 10 kg of water per hour is to be heated from $20^{\circ }\mathrm{C}$ to $80^{\circ }\mathrm{C}$. To do this steam at $150^{\circ }\mathrm{C}$ is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at $90^{\circ }\mathrm{C}$. How many kg of steam is required per hour. ? (Specific heat of steam $=1\mathrm{cal}/{\mathrm{g}}^{\circ }\mathrm{C}$, Latent heat of vaporisation $=540\mathrm{cal}/\mathrm{g}$ )