Behavior of Bare and Aspirated Thermocouples in Compartment Fires.
Behavior of Bare and Aspirated Thermocouples in
Compartment Fires.
(156 K)
Blevins, L. G.
HTD99-280;
National Heat Transfer Conference, 33rd. Proceedings.
HTD99-280. August 15-17, 1999, Albuquerque, NM, 1999.
Keywords:
compartment fires; thermocouples; temperature
measurements; instruments; room fires
Abstract:
As part of an effort to characterize the uncertainties
associated with temperature measurements in fire
environments, models of bare bead, single-shielded
aspirated, and double-shielded aspirated thermocouples
were developed and used to study the expected effects of
varying the gas and average effective surroundings
temperatures on the percent error in measured
temperature of each type of thermocouple. The models
indicate that thermocouples respond differently to
changes in effective surroundings temperature in a hot
upper layer than in a relatively cooler lower layer of a
room fire. The use of an aspirated thermocouple reduces
the error in the measurement, but does not eliminate it
entirely. The present study is intended to provide fire
researchers with a methodology for developing working
models of thermocouples which are tailored to their own
configurations.
