Air-conditioning design: The conditioned supply air delivered to a room must be capable of handling which types of internal loads?

Introduction / Context:
HVAC systems must maintain both temperature and humidity to satisfy comfort and process requirements. This requires the supply air to address sensible (temperature-related) and latent (moisture-related) loads.

Given Data / Assumptions:

• Typical comfort air-conditioning application.
• Loads include people, equipment, lighting, infiltration, and internal moisture sources.
• Supply air is conditioned to a state on the psychrometric chart capable of removing both heat and moisture.

Concept / Approach:
Total room load = sensible load + latent load. Sensible load changes dry-bulb temperature; latent load changes humidity ratio through condensation at the cooling coil. Adequate design chooses supply air temperature and humidity so that its enthalpy and humidity ratio allow removal of both components.

Step-by-Step Solution:
Compute room sensible heat (RSH) and room latent heat (RLH).Select supply air state below room air temperature and with a humidity ratio low enough to dehumidify.Ensure supply airflow rate satisfies both sensible and latent load constraints.

Verification / Alternative check:
On a psychrometric chart, the room sensible heat factor line and apparatus dew point selection ensure both temperature and moisture control.

Why Other Options Are Wrong:

• Sensible only/latent only: ignores full comfort requirement.
• Neither or equipment-only: incomplete; ventilation is a separate requirement but does not replace thermal and humidity control.

Common Pitfalls:
Sizing by sensible load alone can lead to poor humidity control; oversizing airflow without dehumidification can worsen comfort.

Final Answer:
Both room sensible heat and latent heat loads