1. What is Mass Flow Rate for Heat Exchangers?

Definition: This calculator determines the mass flow rate of a fluid required to achieve a specific heat transfer rate in a heat exchanger.

Purpose: It helps engineers and technicians design and analyze heat exchanger systems by calculating the necessary fluid flow rate.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Mass flow rate (lb/hr)
• \( Q_{btu} \) — Heat transfer rate (BTU/h)
• \( c \) — Specific heat capacity (BTU/lb·°F)
• \( \Delta T \) — Temperature difference (°F)

Explanation: The heat transfer rate is divided by the product of specific heat capacity and temperature difference to determine the required mass flow rate.

3. Importance of Mass Flow Rate Calculation

Details: Proper calculation ensures efficient heat exchanger operation, adequate heat transfer, and optimal system performance.

4. Using the Calculator

Tips: Enter the heat transfer rate in BTU/h, specific heat capacity (default 1.0 BTU/lb·°F for water), and temperature difference in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical specific heat capacity for water?
A: Water has a specific heat capacity of about 1.0 BTU/lb·°F at room temperature.

Q2: How do I determine the heat transfer rate?
A: The heat transfer rate can be calculated from system requirements or measured in existing systems.

Q3: What if I'm using a fluid other than water?
A: Use the specific heat capacity value for your particular fluid (e.g., 0.5 BTU/lb·°F for oil).

Q4: Does this work for both heating and cooling?
A: Yes, the formula works for both heating and cooling applications.

Q5: What units does this calculator use?
A: This calculator uses British Thermal Units (BTU) for energy and pounds (lb) for mass.