Chilled Water Pipe Size Calculator

Pipe Diameter Formula:

\[ D = \sqrt{\frac{4 \times Q}{\pi \times V}} \]

Pipe Diameter (D):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Chilled Water Pipe Size Calculator?

Definition: This calculator determines the required pipe diameter for chilled water systems based on flow rate and velocity.

Purpose: It helps HVAC engineers and designers select appropriate pipe sizes for efficient chilled water distribution.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ D = \sqrt{\frac{4 \times Q}{\pi \times V}} \]

Where:

\( D \) — Pipe diameter (meters)
\( Q \) — Flow rate (cubic meters per second)
\( V \) — Water velocity (meters per second)

Explanation: The formula calculates the minimum pipe diameter needed to maintain the desired flow rate at the specified velocity.

3. Importance of Proper Pipe Sizing

Details: Correct pipe sizing ensures efficient system operation, minimizes pumping energy, and prevents excessive pressure drops.

4. Using the Calculator

Tips: Enter the flow rate in m³/s and desired velocity in m/s (default 1.5 m/s). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical velocity for chilled water pipes?
A: 1-2 m/s is common, with 1.5 m/s often used as a default value for balanced energy efficiency and pressure drop.

Q2: How do I convert flow rate from L/s to m³/s?
A: Divide liters per second by 1000 (1 L/s = 0.001 m³/s).

Q3: What if my calculated diameter isn't a standard pipe size?
A: Round up to the next available standard pipe size to ensure adequate capacity.

Q4: Does this account for pipe material roughness?
A: No, this calculates theoretical diameter. For precise pressure drop calculations, consider pipe material and length.

Q5: What velocity is too high for chilled water systems?
A: Generally avoid exceeding 3 m/s to prevent noise, erosion, and excessive pressure drops.