A heat exchanger has the heat transfer surface A=10m2 with the heat transfer coefficient k=230W/m2K. Hot water, with a mass flow of 0.3kg/s and an inlet temperature of 100C, must heat cold water (with a mass flow of 0.6kg/s and 10C at the inlet). Calculate the temperature of the heated water when it leaves the heat exchanger if it works in: a) Counter current b) Co-current Please use Excel as a tool to help vou during this problem (don't forget to add a picture of your excel sheet in the proposed solution