Hoffman Enclosure Heater Sizing Calculator

Heater Sizing Formula:

\[ \text{Heater Watts} = \frac{\Delta T \times \text{Volume ft³} \times 0.133}{\text{Efficiency}} \]

Heater Watts (W):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Hoffman Enclosure Heater Sizing?

Hoffman enclosure heater sizing calculates the appropriate wattage for electrical enclosure heaters to maintain desired temperature differentials. Proper sizing ensures reliable operation of electrical components in various environmental conditions.

2. How Does the Calculator Work?

The calculator uses the heater sizing formula:

\[ \text{Heater Watts} = \frac{\Delta T \times \text{Volume ft³} \times 0.133}{\text{Efficiency}} \]

Where:

\( \Delta T \) — Temperature rise required (°F)
\( \text{Volume ft³} \) — Enclosure volume in cubic feet
\( 0.133 \) — Conversion constant for heat loss calculation
\( \text{Efficiency} \) — Heater efficiency percentage

Explanation: The formula calculates the wattage needed to overcome heat loss through the enclosure walls and maintain the desired temperature differential.

3. Importance of Proper Heater Sizing

Details: Correct heater sizing prevents condensation, maintains optimal operating temperatures for electrical components, and ensures reliable system performance in cold environments.

4. Using the Calculator

Tips: Enter temperature differential in °F, enclosure volume in cubic feet, and heater efficiency as a percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical efficiency range for enclosure heaters?
A: Most electrical enclosure heaters operate at 85-95% efficiency, depending on the type and design.

Q2: How do I measure enclosure volume accurately?
A: Measure internal dimensions (length × width × height) in feet and multiply to get cubic feet volume.

Q3: What factors affect temperature differential requirements?
A: Ambient temperature, desired internal temperature, insulation quality, and heat generated by internal components.

Q4: Should I oversize the heater?
A: Moderate oversizing (10-20%) is acceptable, but excessive oversizing can cause temperature cycling and reduced component life.

Q5: What about heat loss through openings?
A: This calculation assumes sealed enclosures. For enclosures with significant openings or ventilation, additional calculations may be needed.