1. What is the Wh Per Litre Calculation?

The Wh per litre calculation determines the energy required to heat a given mass of concrete by a specified temperature change. It's essential for planning heating systems in concrete construction, especially in cold weather conditions.

2. How Does the Calculator Work?

The calculator uses the energy calculation formula:

Where:

• \( m \) — Mass of concrete (kg)
• \( c \) — Specific heat capacity of concrete (kJ/kg°C, typically ~0.88)
• \( \Delta T \) — Temperature change required (°C)
• 3.6 — Conversion factor from kJ to Wh

Explanation: The equation calculates the thermal energy needed to raise the temperature of concrete, accounting for its specific heat capacity and the desired temperature increase.

3. Importance of Energy Calculation

Details: Accurate energy calculation is crucial for designing heating systems, estimating energy costs, and ensuring proper curing of concrete in cold weather conditions.

4. Using the Calculator

Tips: Enter mass in kg, specific heat capacity in kJ/kg°C (0.88 is typical for concrete), and desired temperature change in °C. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical specific heat capacity of concrete?
A: Concrete typically has a specific heat capacity of about 0.88 kJ/kg°C, though this can vary slightly with mix composition.

Q2: How does moisture content affect the calculation?
A: Moist concrete requires more energy due to water's higher specific heat capacity (4.18 kJ/kg°C). The calculation should account for total water content in the mix.

Q3: Why convert to watt-hours?
A: Watt-hours are a practical unit for electrical heating systems, making it easier to estimate power requirements and energy costs.

Q4: Does this account for heat loss?
A: No, this is the theoretical minimum. In practice, you'll need additional energy to compensate for heat loss to the environment.

Q5: Can this be used for cooling calculations?
A: Yes, the same formula applies for cooling, with ΔT representing the temperature decrease desired.