# Lump Mass model – steady state

In this calculator you can calculate the steady state
temperatures of a network of bodies. Follow the steps, and if you are
ready press the button calculate and evaluate the results in the graph.

In a lumped capacity model, a thermal system is divided in to

• Heat Capacities
• Thermal Couplings

The heat capacities are called Nodes, and it is assumed that the temperature in one node is uniform. Heat capacities can be:

• Large parts
• Thermally conductive parts
• Multiple parts with good thermal conducion between them
• Parts with "important" temperatures

In the image above, a three node system is shown. Part 1 is in contact with body 2 by a few connection points. Body 2 is in contact with body 3, which is a large and surrounds the other parts.
In the picture to the right, the conductive couplings and radiation couplings identified. Body 1 has a heat source.

Use the calculation tool to calculate the temperatures.

### Step 1 Input system size

 #nodes 2 3 4 5 6 How many nodes does the system contain?(2-6)if you change this, all data will be lost.

### Step 2 Input thermal couplings

 from to type value[W/K] node1 node2 node3 node4 node5 node6 node1 node2 node3 node4 node5 node6 Conduction Convection Radiation

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### Step 3 Constant temperatures nodes (e.g. heatsinks)

 node temperature [K] node1 node2 node3 node4 node5 node6 -

### Step 4 Input Heat loads

 node Power [W] node1 node2 node3 node4 node5 node6 -

### Step 5 Calculate

Press calculate to evaluate the results

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(drag blocks to rearrange locations)

## References

At the end of May, Settels Savenije hosted a DSPE Knowledge Day dedicated to challenges in nanometrology.

Order of frictions and stiffnesses…

For lumped systems consisting of different frictions and stiffnesses, there has been confusion in literature about hysteresis curves and virtual play for many decades.

Make it clean

In mid-April, the second edition of the Manufacturing Technology Conference and the fifth edition of the Clean Event were held together, for the first time, at the Koningshof in Veldhoven (NL).