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BTU/hr Formula:
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The BTU/hr formula calculates the heating rate for hot water systems based on flow rate and temperature difference. It is commonly used in HVAC and plumbing applications to determine the heat transfer capacity of hot water systems.
The calculator uses the BTU/hr formula:
Where:
Explanation: The formula calculates the heat transfer rate by multiplying the water flow rate by the temperature difference and a constant conversion factor that accounts for water density and time conversion.
Details: Accurate BTU/hr calculation is essential for sizing heating systems, determining boiler capacity, designing hydronic heating systems, and ensuring efficient energy transfer in hot water applications.
Tips: Enter flow rate in gallons per minute (GPM) and temperature difference in degrees Fahrenheit (°F). All values must be valid positive numbers.
Q1: What does the 500 constant represent?
A: The 500 constant is derived from water density (8.33 lb/gal), time conversion (60 min/hr), and the specific heat of water (1 BTU/lb-°F).
Q2: Can this formula be used for cooling calculations?
A: Yes, the same formula applies to cooling systems, where ΔT represents the temperature drop across the cooling coil.
Q3: What are typical GPM values for residential systems?
A: Typical residential hot water systems range from 2-10 GPM, depending on the application and system size.
Q4: How accurate is this calculation?
A: The calculation provides a good estimate for water-based systems. For precise engineering applications, additional factors like water quality and system efficiency should be considered.
Q5: Can this be used for other fluids besides water?
A: No, this specific formula is designed for water. Other fluids require different constants based on their specific heat and density.