Thermal resistance is inversely proportional to area. To find the thermal resistance of a 25 square inch cold plate, divide the normalized performance by 25.
Our CP30 standard cold plate is designed for prototyping purposes. It has a thick surface plate for machining. We show two traces - before machining (0.5" / 13 mm) and after machining (0.05" / 1.3 mm). The performance of a custom vacuum-brazed cold plate is usually significantly better than this standard part.
For comparison purposes, the performance of all cold plates is shown using water as the coolant. Treated water is recommended with aluminum (CP20 & CP30) cold plates.