Air at a dry bulb temperature of 30°C and a relative humidity of 30% is conveyed through a heated dryer where it is heated to a dry bulb temperature of 80°C. Then it is conveyed through a bed of granular pet food (100 kg, moisture content 20% on a wet basis) to dry it. The air exits the dryer at a dry bulb temperature of 60°C. The exit air is again heated to 80°C and conveyed through another dryer containing another batch of pet food. The exit air from the second dryer leaves at saturation. Clearly show the paths of air, starting from the ambient air to the saturated air exiting the second dryer on a psychrometric chart. Determine the amount of water removed in the first and the second dryer per kg of dry air.
Air at a dry bulb temperature of 30°C and a relative humidity of 30% is conveyed through a heated dryer where it is heated to a dry bulb temperature of 80°C. Then it is conveyed through a bed of granular pet food (100 kg, moisture content 20% on a wet basis) to dry it. The air exits the dryer at a dry bulb temperature of 60°C. The exit air is again heated to 80°C and conveyed through another dryer containing another batch of pet food. The exit air from the second dryer leaves at saturation. Clearly show the paths of air, starting from the ambient air to the saturated air exiting the second dryer on a psychrometric chart. Determine the amount of water removed in the first and the second dryer per kg of dry air.
Initial temperature of dry air = 30°C
Initial Relative humidity = 30%
Final temperature of the air = 80°C
Moisture content on wet basis = 20%
Exit air initial temperature = 60°C
Exit air is heated to temperature = 80°C
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