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BTU/h Calculation Formula:
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BTU/h (British Thermal Units per hour) radiator sizing calculates the required heat output for a radiator based on room surface area and emission factors. This ensures adequate heating capacity for comfortable room temperatures.
The calculator uses the BTU/h formula:
Where:
Explanation: The formula calculates the total heat output needed by multiplying the room's surface area by the specific emission factor of the heating system.
Details: Correct radiator sizing is essential for efficient heating, energy conservation, and maintaining comfortable indoor temperatures. Oversized radiators waste energy while undersized ones fail to provide adequate warmth.
Tips: Enter surface area in square feet and emission factor in BTU/h per square foot. Both values must be positive numbers for accurate calculation.
Q1: What is a typical emission factor for radiators?
A: Emission factors typically range from 50-150 BTU/h/ft² depending on radiator type, room insulation, and climate conditions.
Q2: How do I measure surface area accurately?
A: Calculate room surface area by measuring length and width, then multiply. Include all heated surfaces for comprehensive calculation.
Q3: What factors affect emission factor?
A: Emission factors are influenced by radiator material, design, water temperature, room insulation, and desired temperature difference.
Q4: Should I add a safety margin to the calculated BTU/h?
A: Yes, it's recommended to add 10-20% safety margin to account for heat loss through windows, doors, and external walls.
Q5: Can this calculator be used for different heating systems?
A: While designed for radiators, the principle applies to various hydronic heating systems with appropriate emission factors.