Question

Air at 32 c dbt and 20oc wbt is passed through a cooling coil maintained at 5 ˚C. the heat extracted by the cooling coil from air is 14 kw and air-flow rate is 42.5 m3/min. determine dbt and wbt of the air leaving the coil

Answer 1

The student's question involves using heat transfer principles to calculate the DBT and WBT of air after it has been cooled. This requires additional data such as specific heat and relative humidity, and typically involves using psychrometric charts or equations.

Step-by-step explanation:

The student is asking to determine the dry bulb temperature (DBT) and wet bulb temperature (WBT) of air leaving a cooling coil where air at 32°C DBT and 20°C WBT is passing through.

Given the heat extracted by the coil is 14 kW and the airflow rate is 42.5 m3/min, the DBT and WBT after the cooling process would typically be lower. However, to accurately calculate the outgoing air temperatures, one would require additional information such as the specific heat of the air, the latent heat of vaporization for water, and the relative humidity of the incoming air.

Usually, psychrometric equations or charts are used to solve this type of problem, and an energy balance would be performed using the heat extraction rate and airflow rate.