Air at 27oC and 50% relative humidity is cooled in a sensible cooling process to 18oC. The air is then heated to 45oC in a sensible heating process. Finally, the air experiences an adiabatic saturation process that increases the relative humidity back to 50%. Find the specific energy that is removed when the air is cooled to 18°C.

Explanation:

First, it is required to find the absolute humidity of air at initial state:

The saturation pressure at is:

Then,

A simple cooling process implies a cooling process with constant absolute humidity. The specific entalphies for humid air are:

Initial state:

Final state:

The specific energy that is removed is:

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explanation:

answer:

a

explanation: