When air is cooled with a heat exchanger with a surface temperature lower than the dew point...

Question

BlackTom AI · Accepted Answer

The question asks: When air is cooled with a heat exchanger with a surface temperature lower than the dew point...

First, let's acknowledge that the provided data about answer options is incomplete: the field answer_options is empty, and only one item appears in answer (labeled as 'b. The absolute humidity decreases because of condensation of vapor'). Because we don't have the full set of choices, we cannot systematically evaluate each option against the others. Nevertheless, we can analyze the scenario described in the question and explain why the given correct option (b) makes sense in that context.

Conceptual basis: When air is cooled to a temperature below its dew point, water vapor in the air begins to condense into liquid water on the cooler surface. This condensation reduces the amount of water vapor present in the air, which means the absolute humidity (the mass of water vapor per unit volume of air) decreases. The condensation removes vapor from the gaseous phase, converting it into liquid water on the surface, thereby lowering the absolute humidity.

Why the suggested option (b) is correct: 'The absolute humidity decreases because of condensation of vapor.' This statement aligns with the physical process of condensation reducing the vapor content of the air, which directly decreases absolute humidity. It correctly links the cooling below the dew point to condensation and the resulting drop in vapor content.

Why other options would be incorrect (in a typical set) – general reasoning since options are missing:
- If an option claimed that absolute humidity remains unchanged, that would be incorrect because condensation removes vapor from the air, reducing its humidity.
- If an option suggested that only relative humidity changes while absolute humidity stays the same, that would be inaccurate in this scenario, since condensation changes the actual amount of water vapor present, i.e., the absolute humidity.
- If an option asserted that cooling below the dew point would increase absolute humidity, that would be physically wrong, as cooling promotes condensation and vapor removal, not addition, of water into the vapor phase.

Summary: With the surface temperature below the dew point, condensation occurs, removing vapor from the air, which lowers the absolute humidity. This directly supports the reasoning in option (b). If additional options were available, they should be evaluated against this condensation-driven change in vapor content; in the absence of them, the provided rationale focuses on the core mechanism at play in this scenario.

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