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Heating Flow Rate Calculator

Heating Flow Rate Formula:

\[ Q = \frac{\text{heat\_load}}{\rho \times c_p \times \Delta T} \]

W
kg/m³
J/kg·K
K

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1. What is a Heating Flow Rate Calculator?

Definition: This calculator determines the required fluid flow rate to meet a specific heating load based on the fluid's properties and temperature difference.

Purpose: It helps HVAC engineers and system designers calculate the necessary flow rate for heating systems to achieve desired heat transfer.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = \frac{\text{heat\_load}}{\rho \times c_p \times \Delta T} \]

Where:

Explanation: The heat load is divided by the product of density, specific heat, and temperature difference to determine the required volumetric flow rate.

3. Importance of Flow Rate Calculation

Details: Proper flow rate calculation ensures efficient heat transfer, prevents system overloading, and helps in selecting appropriate pump sizes.

4. Using the Calculator

Tips: Enter the heat load in watts, fluid density (default 1000 kg/m³ for water), specific heat (default 4186 J/kg·K for water), and temperature difference (default 10 K). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical density for water?
A: Pure water at 20°C has a density of about 998 kg/m³, but we often use 1000 kg/m³ for simplicity.

Q2: Why is specific heat important?
A: It determines how much energy is needed to raise the fluid's temperature. Water has a high specific heat compared to other common fluids.

Q3: How does temperature difference affect flow rate?
A: Larger temperature differences require lower flow rates to achieve the same heat transfer, and vice versa.

Q4: Can I use this for cooling calculations?
A: Yes, the same formula applies for cooling systems - just consider the heat load as heat to be removed.

Q5: What if my fluid isn't water?
A: Simply input the correct density and specific heat values for your fluid (e.g., glycol mixtures have different properties).

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