Nowadays
in many applications, use of the high temperature is required and it is to be
maintained for the required time period like in furnaces.
This
concept has the same concept. It is required to design the experimental setup
for testing of thermal insulating material at about 900 0C. So, the basic
requirement is to produce this much high temperature and maintain it.
Using
ASTM (American Standards for Testing Materials), the design of the experimental
setup has been prepared. Capacity of the heater required is calculated on the
basis of heat transfer at 1000 0C.
Thermocouples
have been inserted for the temperature measurement throughout the heating
plate.
Two
main circuits are required. One is to make to average temperature measured by
the thermocouples. And second one is contactor require to cut in/cut out the
heater automatically at the selected temperature. And after finalization of the
circuit, manufacturing of the setup is to be done.
Components
v Heating plate (S.S Plate)
v Wood (Insulation material)
v 2 Electrical heater (Strip type)
v Cover box (M.S.
plate)
v PID Temperature
controller
v Contactor
v 3 PIN
Plug(6 amp,240 V)
v K type Thermocouple
v Wire (16 gauge)
v Bolt and Miscellaneous
Construction and Working of RIG
· Made a box from S.S. Plate with comfortable
dimension because the conductivity of material is depending on the temperature
and also area.
· Set up Strip heater, Contactor, PID temperature
controller using bolts and Miscellaneous as given in circuit diagram.
· First put M.S.Plate on the heater.
· Than set a temperature range according to
ASTM(for WOOD 80 to 150
).
).
· Take temperature reading according to time.
· Than load the material.
· Take a temperature reading according to time.
· So that the variation in conductivity can be calculated by the
given equation.
K= Q/(A.dt)
K = Thermal
conductivity, w/m.k
Q = Rate of
heat flow, k
A = cross
Area of insulation material, m2
dt =variation
in temperature at same time between temperature with material and with out
material.
