electrical heating transfer of heat heat is transferred from a hotter region to a colder region
TRANSCRIPT
Electrical Heating
Specific Heat CapacitySpecific Heat Capacity is the amount of heat energy required to change the temperature of one kilogram of a material through ONE KELVIN (or degree C)
Absolute Heat Energy (J)
Mass (kg)
Temperature change (K or oC)
Specific Heat Capacity(J/kg.K)
Electrical Heating
Heat Control – Thermostats
Bi-Metal Thermostat
Support Stem
Mounting Flange & Screw Thread
Helical Bi-Metal Strip
Brazed to Rod
Invar RodBrazed to Stem
Electrical Heating
Heat Control – Thermostats
Expanding Tube Thermostat
Brass Tube
Invar Rod
Tube Brazedto Rod
Tube Brazedto Support
Retaining Clips
Tube Expands/Contracts
Rod Free End Moves to operate contacts
Electrical Heating
Heat Control – Thermostats
Capillary Tube Thermostat
Bellows Rod moves to operate contacts
Bulb with volatile liquid
Capillary TubeBellows or Diaphragm
Electrical Heating
Heat Control – Thermostats
Bimetal Disc Thermostat
This thermostat has contacts operated by a cupped bimetal disc.
At a pre-set temperature, the disc snaps the contacts open.
When the disc cools to a preset value, disc returns and the contacts snap closed.