Heat transfer effectiveness

A heat transfer effectiveness (HTE) value can be assigned to mold surfaces to indicate the effectiveness of heat transfer through specific mold surfaces.

This value is used to specify the effectiveness of heat transfer for baffles, bubblers, cooling circuits (channels) or connectors for a Cool analysis.

HTE values are automatically set for appropriate cross sections, such as channels, baffles, bubblers and hoses. Rectangular cross sections may need to be set manually.

Note: HTE must be assigned to any bubblers and baffles that exist in your design, this is done automatically. Bubblers require a HTE value of 1 on the outside surface and a value of 0 on the inside surface, and semi-circular baffles should be assigned an HTE value of 0.5.

HTE Values

The program will set a default HTE value of 1, indicating the maximum heat transfer. You can also set the HTE value to 0, indicating that there is no heat transfer through these surfaces. A value of 0.5 is assigned when only half of the surface parameter is used to transfer heat (for example, baffles).

When all the nodes connected to a surface are defined to be at the same temperature, the HTE value given to the surface is irrelevant because there can be no heat flow through the nodes. Thus the default value of HTE need not be changed.

The HTE value of 1, which is assigned to cooling circuit surfaces by default, indicates that the mold feature only absorbs heat. If an HTE of 0 is assigned to a feature, it indicates that the feature absorbs no heat from the mold.