1. What is a Watts to BTU/hr Calculator?

Definition: This calculator converts electrical power in watts to heat output in British Thermal Units per hour (BTU/hr).

Purpose: It helps in understanding the heat output equivalent of electrical devices, useful for HVAC sizing and energy calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat output (BTU/hr)
• \( P \) — Electrical power (Watts)
• 3.412 — Conversion factor (BTU/hr per Watt)

Explanation: This conversion is based on the direct relationship between electrical power and equivalent heat output.

3. Importance of Watts to BTU/hr Conversion

Details: Understanding this conversion helps in sizing cooling systems, comparing electrical and combustion heating systems, and energy efficiency calculations.

4. Using the Calculator

Tips: Simply enter the power in watts to get the equivalent heat output in BTU/hr. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 3.412?
A: This comes from the definition of BTU (1 BTU = 1055.06 Joules) and Watt (1 Watt = 1 Joule/second), resulting in 3600/1055.06 ≈ 3.412.

Q2: Does this conversion work both ways?
A: Yes, to convert BTU/hr to Watts, divide by 3.412 (or multiply by 0.293).

Q3: Is this conversion 100% accurate for all devices?
A: It assumes 100% conversion efficiency. Real-world devices may have different efficiencies.

Q4: What's a typical wattage for household appliances?
A: For example: 1500W space heater ≈ 5118 BTU/hr, 100W bulb ≈ 341 BTU/hr.

Q5: How does this relate to air conditioner sizing?
A: Knowing heat output helps determine cooling needs (1 ton of cooling = 12,000 BTU/hr).