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Conversion Formula:
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The Watts to BTU conversion is used to convert electrical power (measured in watts) to thermal energy output (measured in British Thermal Units per hour). This conversion is essential for understanding the heating capacity of electrical devices and systems.
The calculator uses the conversion formula:
Where:
Explanation: This conversion factor represents the amount of thermal energy produced per unit of electrical power, based on the relationship between electrical energy and heat energy.
Details: Accurate conversion between watts and BTU/hr is crucial for HVAC system design, electrical heating equipment selection, energy efficiency calculations, and thermal management in various applications.
Tips: Enter the electrical power in watts. The value must be positive and greater than zero. The calculator will instantly provide the equivalent thermal output in BTU/hr.
Q1: Why is the conversion factor 3.412?
A: 3.412 BTU/hr per watt is derived from the definition of BTU and watt, where 1 watt = 3.412142 BTU/hr based on the International Table BTU definition.
Q2: What is the difference between BTU and BTU/hr?
A: BTU is a unit of energy, while BTU/hr is a unit of power (energy per unit time). This calculator converts electrical power (watts) to thermal power (BTU/hr).
Q3: Can I use this for air conditioning calculations?
A: Yes, this conversion is commonly used for sizing air conditioning systems, where electrical input power is converted to cooling/heating capacity.
Q4: Is this conversion 100% efficient?
A: This conversion assumes 100% efficiency in converting electrical energy to thermal energy. In real-world applications, efficiency factors may need to be considered.
Q5: What are typical wattage values for common appliances?
A: Space heaters: 750-1500W, Hair dryers: 1200-1875W, Microwave ovens: 600-1200W, Incandescent bulbs: 40-100W per bulb.