1. What is Sensible Heat?

Sensible heat refers to the heat energy that causes a change in temperature of a substance without changing its phase. In HVAC systems, it's the heat that can be "sensed" by a temperature change in the air.

2. How Does the Calculator Work?

The calculator uses the sensible heat equation:

Where:

• \( Q_s \) — Sensible heat (BTU/h)
• \( Q_{air} \) — Air flow rate (CFM)
• \( \Delta T \) — Temperature difference (°F)
• 1.08 — Conversion factor (0.075 lb/ft³ × 0.24 BTU/lb-°F × 60 min/h)

Explanation: The equation calculates the heat energy needed to change the temperature of a given air flow by a specified amount.

3. Importance of Sensible Heat Calculation

Details: Accurate sensible heat calculation is crucial for proper HVAC system sizing, energy efficiency, and maintaining comfortable indoor conditions.

4. Using the Calculator

Tips: Enter air flow in CFM and temperature difference in °F. The calculator will compute the sensible heat in BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between sensible and latent heat?
A: Sensible heat changes temperature, while latent heat changes moisture content (humidity) without temperature change.

Q2: What are typical values for air flow in residential systems?
A: Typically 350-400 CFM per ton of cooling capacity (1 ton = 12,000 BTU/h).

Q3: When is this calculation most important?
A: Crucial for heating system design, cooling load calculations, and ventilation system sizing.

Q4: What affects the 1.08 constant?
A: It's based on standard air density (0.075 lb/ft³) and specific heat (0.24 BTU/lb-°F). Adjust for altitude or different air properties.

Q5: How does this relate to total cooling load?
A: Total cooling load includes both sensible and latent heat components. This calculator only addresses the sensible portion.