1. What is Chiller Flow Rate?

Definition: This calculator determines the required water flow rate through a chiller system based on the heat load and temperature difference.

Purpose: It helps HVAC engineers and technicians properly size chiller systems and piping for optimal performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (m³/s)
• Heat Load — Thermal energy to be removed (W)
• \( \rho \) — Water density (kg/m³, typically 1000)
• \( c_p \) — Specific heat of water (J/kg·K, typically 4186)
• \( \Delta T \) — Temperature difference across chiller (K)

Explanation: The formula calculates the volumetric flow rate needed to remove the specified heat load given the water's properties and desired temperature change.

3. Importance of Flow Rate Calculation

Details: Proper flow rate ensures efficient chiller operation, prevents freezing in evaporators, and maintains designed system performance.

4. Using the Calculator

Tips: Enter the heat load in watts, water density (default 1000 kg/m³), specific heat (default 4186 J/kg·K), and temperature difference in Kelvin. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical ΔT for chiller systems?
A: Most systems are designed for 5-6K (5-6°C) temperature difference, but this can vary based on application.

Q2: Why use water properties?
A: This calculator assumes water as the heat transfer fluid. For other fluids, adjust density and specific heat accordingly.

Q3: How do I convert m³/s to more common units?
A: Multiply by 1000 for l/s, or by 3600 for m³/h. The calculator shows m³/s as it's the SI unit.

Q4: Where do I find the heat load value?
A: Heat load comes from cooling load calculations for the space or from equipment specifications.

Q5: Does this account for system losses?
A: No, consider adding 10-15% to the calculated flow rate for safety factors and system losses.