Question

Air enters a heating and humidification system at 5◦C, 50% relative humidity. The air first passes over a heater, and is then humidified with steam. The steam is supplied at 200 kPa pressure and 300◦C. The air leaves the system at 30◦C, 60% relative humidity.

(a) Determine the heat transfer to the air, per unit mass dry air.

(b) Determine the temperature and relative humidity of the air leaving the heating section (i.e., prior to the humidification section).

(c) Determine the required mass flow of steam, per unit mass of dry air.

Use the psychrometric chart and the steam tables to work this problem.

Answer 1

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429 17-10) ss σ' wabi Vapuơ added 13.5 motJhrse / kg可@w、 mass可 avi