Under normal operating conditions, the hot air blown into a clothes
dryer's tumbler reaches a temperature of about 175 degrees Celsius.
Another air temperature of interest is at the tumbler intake. The
air temperature in this area rose to about 175°C during normal
operation [see Figure 1].
Appliance Magazine: Detection of Abnormal Operating Conditions in Electric
If the lint traps are blocked and the thermostat fails, the resulting
unregulated temperatures have been shown to exceed 400 degrees Celsius.
In FY 2002, U.S. Consumer Product Safety Commission staff
completed a test program to evaluate residential electric clothes
dryers under various test conditions. The test program included
measurements of temperature and airflow characteristics for
different electric clothes dryer designs under normal operating
conditions and conditions of partially-blocked and fully-blocked
exhaust ducting. [...]
3.2.1 Normal Operation (Unblocked Exhaust Vent)
When the dryers were tested with an unblocked exhaust
vent, similar temperatures ?- the intake air temperature
into the heater, the heater housing temperature, the
intake air temperature into the blower, and the exhaust
vent temperature -? were measured among all dryer
3.2.2 Partially-Blocked and 100%-Blocked Conditions
Each dryer design reacted slightly differently when
the exhaust vent was partially blocked and/or 100%
Figure 81 shows the range of highest to lowest maximum
temperatures at the intake into the tumbler for each test
condition. The temperature curves shown in this graph
are similar to those for the heater exhaust (Figure
77), except that the maximum temperature measured
when the exhaust vent was fully blocked was lower ?
U.S. Consumer Product Safety Commission: Final Report on Electric Clothes
Dryers and Lint Ignition Characteristics
A diagram on page 105 of the CPSC report (page 118 of the PDF document)
shows the various places where temperatures can be measured inside a
dryer. Because a sensor cannot be placed inside the tumbler itself,
the nearest location for measuring the temperature inside the tumbler
is T6, the tumbler intake. It is here that the normal temperature of
about 175°C and the maximum temperature of 400°C were observed.
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clothes dryer temperature degrees
laundry dryer temperature limit