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Space Heater Selection Guide

This document provides an overview and guidelines for sizing and selecting heaters to maintain appropriate temperatures inside enclosures. It describes two styles of heaters that offer heating powers from 10W to 800W. Graphs and step-by-step examples are provided to help determine the necessary heater power based on factors like enclosure size and desired temperature differential. Catalog numbers and wattages are listed for semiconductor control panel heaters from 10W to 60W and electric heaters from 100W to 800W.

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Sreegith Chelatt
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103 views2 pages

Space Heater Selection Guide

This document provides an overview and guidelines for sizing and selecting heaters to maintain appropriate temperatures inside enclosures. It describes two styles of heaters that offer heating powers from 10W to 800W. Graphs and step-by-step examples are provided to help determine the necessary heater power based on factors like enclosure size and desired temperature differential. Catalog numbers and wattages are listed for semiconductor control panel heaters from 10W to 60W and electric heaters from 100W to 800W.

Uploaded by

Sreegith Chelatt
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Heaters Heaters Sizing and Selection

Thermal Management
Spec-00311
F63.422.2211
7
763.422.2600

Heaters

Heaters Sizing and Selection Overview


Heaters Sizing and Selection

When temperatures dip below the minimally acceptable ranges for electronics, our electric heaters can raise the temperature inside
enclosures to appropriate levels. Heaters are designed to protect sensitive mechanical, electrical and electronic equipment from the
harmful effects of condensation and corrosion. Two styles offer heating powers from 10 W to 800 W.

The graph in “Semiconductor Control Panel Heaters (for 10-60 W Heating Applications)” represents a painted-steel enclosure mounted in a calm-
air building interior. The lowest temperature differential between room temperature and enclosure interior must be 10 F+ to prevent humidity and
condensation. For outdoor applications, double the heating power requirement.

Semiconductor Control Panel Heaters (for 10-60 W Heating Applications)

Step 1:
Plot your application using the graph.
• F ind surface area (for example, 4 ft. 2 ) on the vertical scale
• Draw a horizontal line across to the intersection point with the diagonal line representing ΔT = 40 F
• E xtend a vertical line down to the horizontal scale to determine your total heating power required (W = 45 W)
Step 2:
From the total Watts required, subtract the 20 W from pre-existing components to arrive at the minimum heater power of 25 W. The 30 W
DAH301 heater should be selected in this case since it is the nearest size that exceeds the requirement.

1 Thermal Management SUBJECT TO CHANGE WITHOUT NOTICE EQUIPMENT PROTECTION SOLUTIONS


Spec-00311 F
Heaters Heaters Sizing and Selection

Electric Heaters (for 100-800 W Heating Example:


Applications) Which electric heater would most-efficiently maintain a 60 F
temperature in an uninsulated 24 x 24 x 10 enclosure that is exposed
to a temperature not less than 30 F?
Step 1:
Calculate the total enclosure surface area.
- Area (ft. 2) = 2[(AxB)+(AxC)+BxC)] ÷ 144 where “A”, “B” and “C”
are the dimensions of the enclosure.
In our example,
- Area = 2[(24x24)+(24x10)+(24x10)] ÷ 144 = 14.7 ft. 2
Step 2:
Using the graphs, draw a vertical line through the enclosure surface
area and determine the temperature rise given by each heater.
For enclosures exposed to windy conditions, heaters should be
oversized by approximately 50 percent.
Step 3:
Select the electric heater that achieves the desired temperature
rise. In our example, the desired temperature rise is 30 F (60 F - 30
F). The 200 W heater should be selected since its temperature rise
(35 F) exceeds the requirement.

Semiconductor Control Panel Heaters Catalog No. Watts


DAH101 10
DAH301 30
DAH601 60

Electric Heaters Catalog No. Watts


DAH1001A 100
DAH1002A 100
DAH2001A 200
DAH2002A 200
DAH4001B 400
DAH4002B 400
DAH8001B 800
DAH8002B 800

EQUIPMENT PROTECTION SOLUTIONS PH 763.422.2211 • FAX 763.422.2600 • HOFFMANONLINE.COM Thermal Management 2


Spec-00311 F

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