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Thermal Mass

Mass in thermal systems


Thermal Elements


The Thermal Mass block represents a thermal mass, which reflects the ability of a material or a combination of materials to store internal energy. The property is characterized by mass of the material and its specific heat. The thermal mass is described with the following equation:



QHeat flow
cSpecific heat of mass material

The block has one thermal conserving port. The block positive direction is from its port towards the block. This means that the heat flow is positive if it flows into the block.


To set the priority and initial target values for the block variables prior to simulation, use the Variables tab in the block dialog box (or the Variables section in the block Property Inspector). For more information, see Set Priority and Initial Target for Block Variables.



Mass. The default value is 1 kg.

Specific heat

Specific heat of the material. The default value is 447 J/kg/K.


The block has one thermal conserving port, associated with the mass connection to the system.

See Also

Introduced in R2007b

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