1. What is a Flow Rate to BTU Calculator?

Definition: This calculator determines the heat transfer rate in BTUs based on water flow rate, specific heat capacity, and temperature change.

Purpose: It helps HVAC engineers, mechanical designers, and energy professionals calculate thermal energy transfer in fluid systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat transfer rate (BTU/h)
• \( \dot{m} \) — Mass flow rate (lb/h)
• \( c \) — Specific heat capacity (BTU/lb·°F)
• \( \Delta T \) — Temperature change (°F)

Explanation: The formula calculates the thermal energy required to change the temperature of a flowing fluid by multiplying the mass flow rate by the specific heat and temperature difference.

3. Importance of BTU Calculation

Details: Accurate BTU calculations are essential for sizing boilers, chillers, heat exchangers, and other thermal equipment in HVAC and process systems.

4. Using the Calculator

Tips: Enter the mass flow rate in pounds per hour, specific heat capacity (default 1.0 BTU/lb·°F for water), and temperature change in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the specific heat capacity of water?
A: Water has a specific heat of 1 BTU/lb·°F, but this varies slightly with temperature and purity.

Q2: How do I convert GPM to lb/h?
A: Multiply gallons per minute by 500 (for water at standard conditions: 1 GPM ≈ 500 lb/h).

Q3: What if my fluid isn't water?
A: Use the specific heat value for your particular fluid (e.g., 0.5 for oil, 0.24 for air).

Q4: Does this work for cooling calculations?
A: Yes, the same formula applies - just use the temperature drop instead of rise.

Q5: How accurate is this calculation?
A: It provides theoretical values. Real-world systems may require adjustments for efficiency losses.