2. About the method..
• Measured by calorimeter
• Microwave
Heat energy
• Heat absorbed by fluid then measuring the
temperature rise
3. Types
• Direct method:
Heat can be observed by rise in the
dissipating medium
• Indirect method:
Heat transferred to other medium then
measured.
4. Type of measuring meter
•
•
•
•
»Static calorimeter
»Circulating calorimeter
Static calorimeter:
it consist of 50𝞨
co-axial cable, filled
with dielectric load whose hysteresis loss is
high.
Average power input is:
P=
watts
5. **
• m = mass of the thermometric medium in gms
•
= its specific heat in cal/gms
• T= temperature rise in degree celsius
• T= time in sec.
7. Limitation
• Thermal inertia caused by lag between
application of microwave and parameter
readings.
• Thermal inertia- the degree of slowness with which the temperature of a
body approaches that of its surroundings
