Home
Back
Heat Loss Equation:
| From: | To: |
Heat loss calculation determines the amount of heat energy that escapes from a building through various surfaces and components. It is essential for proper HVAC system sizing, energy efficiency analysis, and building design optimization.
The calculator uses the fundamental heat loss equation:
Where:
Explanation: The equation calculates the rate of heat transfer through a building envelope component based on its thermal properties, size, and the temperature gradient.
Details: Accurate heat loss calculation is crucial for proper heating system design, energy conservation, cost estimation, and ensuring occupant comfort in residential and commercial buildings.
Tips: Enter U-value in BTU/h ft² °F, surface area in square feet, and temperature difference in Fahrenheit. All values must be positive numbers for accurate calculation.
Q1: What is U-value and how is it determined?
A: U-value measures how well a building element conducts heat. Lower values indicate better insulation. It's determined by material properties and can be found in building material specifications.
Q2: Why is temperature difference important?
A: The greater the temperature difference between inside and outside, the faster heat will transfer through building components, increasing heat loss.
Q3: How do I calculate total house heat loss?
A: Calculate heat loss for each building component (walls, windows, roof, floor) separately using their respective U-values and areas, then sum all results.
Q4: What are typical U-values for residential buildings?
A: Well-insulated walls: 0.05-0.1 BTU/h ft² °F, double-pane windows: 0.5-0.8 BTU/h ft² °F, roofs: 0.03-0.07 BTU/h ft² °F.
Q5: How does this relate to heating system sizing?
A: The total calculated heat loss determines the minimum capacity required for the heating system to maintain comfortable indoor temperatures during cold weather.