Heat Loss Calculator kW

Heat Loss Formula:

\[ Q = \frac{\sum U \times A \times \Delta T}{1000} \]

Heat Loss (kW):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Heat Loss Calculator?

Definition: This calculator estimates heat loss in kilowatts based on U-value, surface area, and temperature difference.

Purpose: It helps engineers, architects, and homeowners determine heat loss through building elements for proper HVAC system sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = \frac{\sum U \times A \times \Delta T}{1000} \]

Where:

\( Q \) — Heat loss (kW)
\( U \) — U-value (W/m²K)
\( A \) — Surface area (m²)
\( \Delta T \) — Temperature difference (K)

Explanation: The U-value represents thermal transmittance, multiplied by surface area and temperature difference, then divided by 1000 to convert watts to kilowatts.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculations ensure energy-efficient building design, proper heating system sizing, and reduced energy costs.

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 = better insulation).

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

Q3: Should I calculate for each building element separately?
A: Yes, calculate heat loss for each component (walls, windows, roof) then sum the results.

Q4: Why divide by 1000?
A: This converts the result from watts to kilowatts (1 kW = 1000 W).

Q5: Does this include ventilation heat loss?
A: No, this calculates conductive heat loss only. Add infiltration losses separately.