1. What is Mass Flow Rate of Refrigerant?

Definition: This calculator determines the mass flow rate of refrigerant based on volumetric flow rate and refrigerant density.

Purpose: It helps HVAC technicians and engineers calculate refrigerant mass flow for system design and troubleshooting.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Mass flow rate (lb/hr)
• \( Q \) — Volumetric flow rate (gallons per minute)
• \( \rho_r \) — Refrigerant density (lb/gallon)
• 60 — Conversion factor (minutes to hours)

Explanation: The formula converts volumetric flow to mass flow and adjusts the time unit from minutes to hours.

3. Importance of Mass Flow Rate Calculation

Details: Accurate mass flow rate calculations are essential for proper system sizing, refrigerant charge determination, and performance analysis.

4. Using the Calculator

Tips: Enter the volumetric flow rate in GPM and refrigerant density in lb/gal (default 7.2 lb/gal for R-134a at 100°F). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 60 in the formula?
A: The factor converts minutes (from GPM) to hours (for lb/hr output), standardizing the time unit.

Q2: What's a typical refrigerant density?
A: Density varies by refrigerant type and temperature (e.g., R-22 is ~8.2 lb/gal, R-134a ~7.2 lb/gal at 100°F).

Q3: How do I find the volumetric flow rate?
A: Measure using flow meters or calculate from system specifications and operating conditions.

Q4: Can I use this for other fluids?
A: Yes, but ensure you have the correct density for the specific fluid at operating conditions.

Q5: What if my refrigerant is a blend?
A: Use the average density of the blend or consult the manufacturer's specifications.