Sensible Cooling Load Heat Gain through Structure Calculator

Sensible Cooling Load Formula:

\[ Q = U \times A \times CLTD \]

Overall Heat Transfer Coefficient:

W/m²·K

Surface Area:

m²

Cooling Load Temperature Difference:

Tolerance:

Sensible Cooling Load (W):

With Tolerance Range (±5%):

1. What is Sensible Cooling Load Heat Gain through Structure?

Definition: This calculator estimates the sensible heat added or removed from conditioned space through building structures like walls, roofs, and windows.

Purpose: It helps HVAC professionals and engineers determine the cooling capacity needed to maintain comfortable indoor temperatures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = U \times A \times CLTD \]

Where:

\( Q \) — Sensible cooling load (Watts)
\( U \) — Overall heat transfer coefficient (W/m²·K)
\( A \) — Surface area (m²)
\( CLTD \) — Cooling Load Temperature Difference (K)

Explanation: The formula calculates heat transfer through a building envelope component based on its thermal properties and temperature difference.

3. Importance of Sensible Cooling Load Calculation

Details: Accurate calculation ensures proper HVAC system sizing, energy efficiency, and thermal comfort in buildings.

4. Using the Calculator

Tips: Enter the U-value, surface area, CLTD, and optional tolerance percentage (default ±5%). All values must be > 0 except tolerance.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Typical U-values range from 0.1-0.3 W/m²·K for insulated walls, higher for single-pane windows.

Q2: How is CLTD determined?
A: CLTD depends on construction type, orientation, color, and time of day. Use ASHRAE tables or software.

Q3: Why include tolerance?
A: Tolerance accounts for uncertainties in material properties, aging, and environmental factors.

Q4: Does this include latent heat?
A: No, this calculates only sensible heat. Latent heat from humidity requires separate calculation.

Q5: How to reduce cooling load?
A: Improve insulation (lower U-value), reduce surface area, use reflective materials, or shade windows.