1. What is Number of Tubes in Two Pass Triangular Pitch?

Definition: This calculator estimates the number of tubes that can fit in a heat exchanger bundle with two-pass triangular pitch arrangement based on bundle diameter and tube outer diameter.

Purpose: It helps heat exchanger designers determine the maximum number of tubes that can be accommodated in a given bundle diameter.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( N_{Tubes} \) — Number of tubes in the bundle
• \( D_B \) — Bundle diameter (m)
• \( D_{Outer} \) — Outer diameter of tubes (m)

Explanation: The formula is an empirical correlation that accounts for the triangular pitch arrangement and two-pass configuration of the heat exchanger.

3. Importance of Tube Count Calculation

Details: Proper tube count estimation ensures optimal heat transfer area, proper fluid flow distribution, and efficient heat exchanger design.

4. Using the Calculator

Tips: Enter the bundle diameter and tube outer diameter in meters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is triangular pitch in heat exchangers?
A: Triangular pitch means tubes are arranged in equilateral triangles, which provides more tubes per area than square pitch.

Q2: Why does the formula have exponent 2.207?
A: The exponent comes from empirical data fitting for two-pass triangular pitch arrangements.

Q3: How accurate is this calculation?
A: It provides a good estimate but actual tube counts may vary based on tube layout constraints and manufacturing considerations.

Q4: Can this be used for single-pass heat exchangers?
A: No, this formula is specifically for two-pass arrangements. Single-pass would use a different correlation.

Q5: What's the typical range for tube outer diameters?
A: Common tube diameters range from 1/4" (6.35mm) to 2" (50.8mm), but the calculator works with any diameter.