1. What is a Flow Rate to BTU Calculator?

Definition: This calculator estimates the heat transfer rate (BTU/h) based on water flow rate and temperature difference.

Purpose: It helps HVAC professionals, engineers, and technicians determine system capacity for heating or cooling applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — Heat transfer rate (BTU per hour)
• \( Flow \) — Water flow rate (gallons per minute)
• \( \Delta T \) — Temperature difference (°F)
• \( 500 \) — Constant (8.33 lb/gal × 60 min/hr × 1 BTU/lb-°F)

Explanation: The formula calculates the energy required to change the temperature of a given water flow by a specified temperature difference.

3. Importance of BTU Calculation

Details: Accurate BTU calculation ensures proper system sizing, energy efficiency, and effective temperature control in HVAC systems.

4. Using the Calculator

Tips: Enter the flow rate in gallons per minute (gpm) and the temperature difference in °F between supply and return water.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 500 used?
A: It combines water density (8.33 lb/gal), time conversion (60 min/hr), and specific heat (1 BTU/lb-°F) into one constant.

Q2: Can this be used for cooling systems?
A: Yes, the same formula applies for both heating and cooling applications.

Q3: What's a typical ΔT for HVAC systems?
A: Most systems are designed for 20°F ΔT, but this can vary based on system type and design.

Q4: How do I measure flow rate?
A: Use flow meters, pump curves, or manufacturer specifications for accurate flow measurement.

Q5: Does this work for fluids other than water?
A: No, the formula is specific to water. Other fluids require different constants based on their density and specific heat.