HEAT TRANSMISSION
MEASUREMENTS IN
THERMAL INSULATIONS
STP 544-1980
During the past decade there has been an ever-increasing utilization of thermal insulation materials and systems. Furthermore, the impact of the world energy crisis has fostered additional expansion in the prediction and use of thermal insulation which will not diminish in the coming years. Applications have become more exotic, conditions of temperature and environment more extreme, and the consequent insulation systems and their means of evaluation are now more sophisticated. As a result, new methods for measurement of thermal performance must be developed and existing methods improved in order to keep abreast of this continued use of thermal insulation. Insulating materials are generally in homogeneous, because heat transfer in them can take place through a number of separate and interacting mechanisms.
By means of more reliable measurements of heat transmission, we become more aware of these mechanisms and how the performance of certain materials and systems depend less upon solid conduction than upon other processes such as radiation, convection, and mass transfer. With more confidence in the results, we can better understand heat transmission behavior and, consequently, develop better and more economical materials and systems.
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