Selecting a Modular Cooling System

Calculate Which System You Need

MCS performance is shown as Q/ITD versus flow rate. Q is heat load, and ITD is the initial temperature difference, or the difference between MCS liquid inlet temperature and ambient air temperature.

To select the correct MCS system, you first need to determine Q/ITD. Then, using the MCS performance graph, draw a horizontal line at the calculated Q/ITD value. Finally, check that the pump will provide sufficient flow rate.


A laser produces 700 W of waste heat. The water temperature exiting the laser should be less than 35°C. Ambient room temperature is 20°C. The laser equipment requires a flow rate of at least 1 gpm. Which MCS system should be selected?

First, determine Q/ITD Q/ITD = 700 W/(35°C-20°C) = 46.7 W/°C

Using the thermal performance graph, you can see that at flow rates above 0.5 gpm, MCS20 will provide adequate performance. The standard BB pump offers a flow rate of 1.3 gpm so it will work well. If you are considering an alternative pump, use the pump flow rate calculation to verify that with the given pressure drop, flow rate will be sufficient.

Thermal Performance and MCS Positive Displacement Pump Graph

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