A flow of moist air from a domestic furnace, state 1, is at 45◦C, 10% relative humidity with a flow rate of 0.05 kg/s dry air. A small electric heater adds steam at 100◦C, 100 kPa generated from tap water at 15◦C. Up in the living room the flow comes out at state 4: 30◦C, 60% relative humidity. Find the power needed for the electric heater and the heat transfer to the flow from state 1 to state 4.

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Wal LIQ+2 FIGURE P11.100