The air inside a space capsule is maintained at the required condition by passing it through a set of heat exchanger. The heat exchangers are designed such that the humid air passing through them is cooled and partial condensation of the water vapour occurs. On a psychrometric chart, this process appears as a line which is

• A. Horizontal to the left
• B. Vertical downwards
• C. Diagonal downwards to the left
• D. Diagonal upwards to the right