1. What is the Water Heating Power Equation?

The water heating power equation calculates the required power (in kW) to heat a specific volume of water by a certain temperature in a given time, accounting for system efficiency.

2. How Does the Calculator Work?

The calculator uses the water heating equation:

Where:

• \( volume_L \) — Water volume in liters
• \( \Delta T \) — Temperature increase in °C
• \( time_h \) — Heating time in hours
• \( efficiency \) — System efficiency (0-1)
• 4.186 — Specific heat capacity of water (kJ/kg·K)
• 3600 — Conversion from seconds to hours

Explanation: The equation calculates the energy required to heat water and converts it to power (kW) based on the heating time and system efficiency.

3. Importance of Heating Power Calculation

Details: Accurate heating power calculation is crucial for sizing water heaters, boilers, and other heating systems to ensure they can meet demand while operating efficiently.

4. Using the Calculator

Tips: Enter water volume in liters, temperature increase in °C, heating time in hours, and system efficiency as a fraction (e.g., 0.95 for 95%). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the specific heat capacity of water?
A: The calculator uses 4.186 kJ/kg·K, which is the value for water at standard conditions.

Q2: How does efficiency affect the result?
A: Lower efficiency values increase the required kW as more energy is lost in the heating process.

Q3: Can I use this for other liquids?
A: For other liquids, you would need to adjust the specific heat capacity value (4.186) to match the liquid's properties.

Q4: What's a typical efficiency value for water heaters?
A: Electric heaters typically have 95-98% efficiency, gas heaters 80-90%, and heat pumps 200-300% (COP).

Q5: How do I convert the result to other units?
A: 1 kW = 3412 BTU/h = 859.8 kcal/h = 1.34 hp