Hioki LR8432-20, Instruction Manual

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Appendix 12 Heat Flow
A
42
Heat flow indicates a quantity of heat energy that flows through the unit area per unit
time (unit: W/m
2
).
Temperature, on the other hand, indicates a result of heat energy movement (varies
depending on the thermophysical property of a material). The Heat Flow Sensor
allows you to determine the heat flow (in and out) and quantity of heat. As a result, it
is now possible to find fluctuations in heat energy that are not apparent when using
only temperature measurement.

Heat quantity
Measurement using LR8432
• Measurement can be performed with the Heat Flow Sensor attached to one side of
the insulation material.
• The quantity of heat can be found from the numerical value and waveform.
Appendix 12 Heat Flow
Heat flow
Heat Flow Sensor Heat Flow
Sensor
High heat
loss
Low heat
loss
Example: Evaluation of
insulation performance
Thermocouples
To evaluate the performance based on the temper-
ature, it is necessary to measure the temperature
on both sides of the material and perform the calcu-
lation with consideration for the material’s heat re-
sistance, etc.
Example: Evaluation of insulation performance based on temperature