Thermal Resistor
Thermistor.
Description
The Thermal Resistor block represents a thermistor (temperature-dependent resistor). When the temperature at the thermal port is , the resistance is equal:
,
where:
-
- resistance at nominal temperature .
-
- temperature coefficient.
The following equation describes the thermal behaviour of the unit:
,
where:
-
- heat flux to port H.
-
- value of Dissipation factor.
-
- value of Thermal time constant.
-
- is the rate of temperature change.
-
- current through the resistor.
Parameters
Nominal resistance - resistance at nominal temperature
1 ohm (by default) | positive scalar
The resistance of the thermistor at nominal temperature. Many specifications specify resistance at 25°C (298.15 K); denoted `R25'.
Reference temperature is the nominal temperature
298.15 K (by default) | positive scalar
The temperature at which the nominal resistance was measured.
Temperature coefficient - the coefficient of resistance dependence on temperature
5e-6 1/K (by default) | positive scalar
Coefficient in the equation describing resistance as a function of temperature.
Thermal time constant - time constant for the thermal equation
10 s (by default) | positive scalar
The time it takes for the resistor temperature to reach 63% of the final temperature change when the ambient temperature is jumped.
Dissipation factor - dissipation factor for thermal equation
0.001 W/K (by default) | `positive scalar'.
Thermal power required to raise the temperature of the thermistor by 1 .
Initial value of temperature t - initial value of temperature t
`300 K (by default).
Initial value of temperature .