1. What is a Heat Trace Wattage Per Foot Calculator?

Definition: This calculator determines the required wattage per foot for heat trace cables based on heat loss and system efficiency.

Purpose: It helps engineers and technicians properly size heat tracing systems to maintain desired temperatures in pipes and equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Wattage per foot (W/ft)
• \( H \) — Heat loss per foot (BTU/ft)
• \( E \) — System efficiency (%)

Explanation: The heat loss is divided by the efficiency (as a decimal) to determine the required wattage to compensate for the heat loss.

3. Importance of Proper Wattage Calculation

Details: Accurate wattage calculation ensures the heat trace system maintains temperature without underheating (risking freeze damage) or overheating (wasting energy).

4. Using the Calculator

Tips: Enter the heat loss per foot in BTU/ft and system efficiency percentage (default 100%). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine heat loss per foot?
A: Heat loss can be calculated using engineering formulas or software that considers pipe size, insulation, temperature differential, and ambient conditions.

Q2: What's a typical efficiency value?
A: Most systems use 100% efficiency, but this may be lower for certain applications or older systems.

Q3: Why convert BTU/ft to W/ft?
A: Heat trace cables are typically rated in watts, while heat loss is often calculated in BTUs, requiring conversion (1 W = 3.412 BTU/hr).

Q4: Should I add a safety factor?
A: It's common to add 10-20% to the calculated wattage to account for variations in conditions and ensure reliability.

Q5: Can this be used for different pipe materials?
A: Yes, as long as the heat loss value accounts for the pipe material's thermal properties.