kJ kgK 3. 30 points - A well-insulated heat exchanger is used to heat up air (Cp = 1.007- in tubes from 20C (at inlet) to 80C (at exit) at a rate of 100 kg/s. Assume that the heating of the air is isobaric. The heating for this air is obtained from 1 kg/s-hot-water that enters the heat exchanger as saturated vapor at 100 kPa. a. Draw the flow and flow diagram of this case. b. Based on the flow diagram, clearly state the 1st Law for this case. a. Clearly state all given properties for the "hot" and "cold" fluids of this case. b. Obtain the amount of heat transferred needed by air from the water. C. C. Determine the temperature of the water at the heat exchanger inlet and exit. Is this process realistic? Explain using 2nd Law.