1. What is a Heat Calculator?

Definition: This calculator estimates the heat required for a space based on U-value, surface area, and temperature difference.

Purpose: It helps HVAC professionals and homeowners determine heating requirements for rooms or buildings.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat required (Watts)
• \( U \) — U-value (W/m²K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference (Kelvin)

Explanation: The U-value represents thermal transmittance, multiplied by area and temperature difference to calculate heat flow.

3. Importance of Heat Calculation

Details: Proper heat calculation ensures comfortable indoor temperatures, energy efficiency, and correct sizing of heating systems.

4. Using the Calculator

Tips: Enter the U-value (thermal transmittance), surface area in square meters, and temperature difference in Kelvin. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is U-value?
A: U-value measures how well a building element conducts heat. Lower values indicate better insulation.

Q2: How do I find the temperature difference?
A: Subtract the desired indoor temperature from the outdoor design temperature (both in °C or K).

Q3: What's a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.1-0.3 W/m²K.

Q4: Does this include ventilation losses?
A: No, this calculates only conduction losses. Add 10-20% for ventilation losses in a typical calculation.

Q5: How do I convert the result to BTU/h?
A: Multiply Watts by 3.412 to get BTU/h.