Variable Thermal Resistance
Variable thermal resistance.
blockType: AcausalFoundation.Thermal.Elements.VariableResistance
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Description
Block Variable Thermal Resistance allows you to simulate the time-varying process of heat transfer in generalized terms, regardless of whether it is carried out by thermal conductivity, convection, radiation or a combination thereof. Thermal resistance is an abstract quantity that combines thermal conductivity, convection and thermal radiation. The thermal resistance of this unit varies according to the input scalar signal on the port R.
Heat transfer equation for thermal resistance unit:
Where:
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— thermal resistance.
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— heat flow.
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— temperature difference between layers.
Thermal resistance is related to other heat transfer quantities as follows:
Where:
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— the distance between the layers, that is, the thickness of the material.
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— the cross-sectional area perpendicular to the direction of the heat flow.
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— thermal conductivity of the material.
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— coefficient of convective heat transfer.
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— radiation coefficient.
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and — temperatures at ports A and B, respectively.
Parameters
Minimum thermal resistance — minimum allowable value of thermal resistance
0K/W (by default)
If the input scalar signal falls below this value, the resistance remains at this value.
Initial value of temperature difference — initial value of temperature difference
0.0 K (by default)
The initial value of the temperature difference.
Initial value of heat flow rate — initial value of heat flow
0.0 W/(K*m2) (by default)
The initial value of the heat flow.