Thermal Resistor
Thermistor.
blockType: AcausalFoundation.Electrical.Elements.ThermalResistor
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Description
Block Thermal Resistor It is a thermistor (temperature-dependent resistor). When the temperature at the thermal port is , the resistance is equal to:
,
Where:
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— resistance at nominal temperature .
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— temperature coefficient.
The following equation describes the thermal behavior of the block:
,
Where:
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— heat flow to port H.
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— value of the Dissipation factor parameter.
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— the value of the parameter Thermal time constant.
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— the rate of temperature change.
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— current through the resistor.
Parameters
Nominal resistance — resistance at nominal temperature
1 ohm (by default) | positive scalar
Resistance of the thermistor at nominal temperature. Many specifications indicate resistance at 25°C (298.15 K); denoted R25.
Reference temperature — nominal temperature
298.15 K (by default) | positive scalar
The temperature at which the nominal resistance was measured.
Temperature coefficient — coefficient of dependence of resistance on temperature
5e−6 1/K (by default) | positive scalar
Coefficient in an equation describing resistance as a function of temperature.
Thermal time constant — the time constant for the thermal equation
10s (by default) | positive scalar
The time during which the temperature of the resistor reaches 63% of the final temperature change with an abrupt change in ambient temperature.
Dissipation factor — the dissipation factor for the thermal equation
0.001 W/K (by default) | positive scalar
Thermal power required to increase the temperature of the thermistor by 1 .
Initial value of temperature t — initial value of temperature t
300K (by default)
Initial temperature value .