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Moist air at 20ºC dry-bulb and 8ºC wet-bulb temperature is to be processed to a final dew-point temperature of 13ºC by adiabatic injection of saturated steam at 110ºC. The rate of dry airflow is 2 kg/s (dry air). Find:

a) The final dry-bulb temperature of the moist air.
b) The rate of steam flow (the mass flow rate of water).

Answer :

The final dry-bulb temperature of the moist air is 19.5ºC, and the rate of steam flow is approximately 0.465 kg/s.

The final dry-bulb temperature of the moist air is 19.5ºC the rate of steam flow is approximately 0.465 kg/s to find the final dry-bulb temperature, we use the concept of enthalpy conservation. The initial enthalpy of the moist air is equal to the sum of the enthalpy of dry air and the enthalpy of water vapor. By considering the adiabatic injection of saturated steam, we can calculate the final enthalpy of the moist air. From the final enthalpy, we can determine the final dry-bulb temperature.

To calculate the rate of steam flow, we use the concept of enthalpy conservation again. By considering the enthalpy change due to the injection of saturated steam, we can calculate the change in specific enthalpy. Dividing this enthalpy change by the latent heat of vaporization, we can determine the rate of steam flow. The final dry-bulb temperature of the moist air is 19.5ºC, and the rate of steam flow is approximately 0.465 kg/s.

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