Wax motor
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A wax motor is a linear actuator device that converts thermal energy into mechanical energy by exploiting the phase-change behaviour of waxes. During melting, wax typically expands in volume by 5–20%.
Thermostatic radiator valves
A wax motor manufactured by iSwell
Thermistor
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A thermistor is a semiconductor type of resistor in which the resistance is strongly dependent on temperature. The word thermistor is a portmanteau of thermal and resistor. The varying resistance with
Wax motor
…stroke-rod to convert the thermo-hydraulic force from the wax into a useful mechanical output A source of heat such as: Electric current; typically a PTC thermistor, that heats the wax Solar radiation; e.g. greenhouse vents Combustion heat; e.g. excess heat from internal combustion engines Ambient heat A sink to…
Negative-temperature-coefficient (NTC) thermistor, bead type, insulated wires