Difficulty: Medium
Correct Answer: Dew-point temperature
Explanation:
Introduction / Context:
Being fluent with psychrometric charts is essential in HVAC. Different families of lines represent different properties; recognizing their orientation and spacing avoids reading errors.
Given Data / Assumptions:
Concept / Approach:
On typical charts: dry-bulb are vertical straight lines; humidity ratio lines are horizontal and generally uniformly spaced; wet-bulb are diagonally sloped lines; relative humidity are curved lines; dew-point temperature corresponds to horizontal projection to the saturation curve and is shown as horizontal, non-uniformly spaced markings along saturation.
Step-by-Step Solution:
Verification / Alternative check:
Cross-check with a standard chart legend; RH lines are curved, DBT vertical, WBT sloped, w horizontal, and T_dp indicated along saturation with non-uniform spacing.
Why Other Options Are Wrong:
Dry-bulb are vertical; wet-bulb are slanted; specific humidity lines are horizontal but typically near-uniform in spacing; RH are curved.
Common Pitfalls:
Confusing humidity ratio horizontal lines with dew-point markings; remember dew-point is read at the saturation boundary.
Final Answer:
Dew-point temperature
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