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![C S P SOLAR 15 Mn *C
[D/d]^2*30 ‘C
D
M
d
M
Mn
*C
d
mm
30 0.01 270.00 10
30 0.02 67.50 20
30 0.03 30.00 30
30 0.04 16.88 40
30 0.0424 15.02 42.4
30 0.05 10.80 50
30 0.06 7.50 60
30 0.07 5.51 70
30 0.08 4.22 80
30 0.09 3.33 90
30 0.1 2.70 100](https://image.slidesharecdn.com/cspsolar15mncsun-160305015513/85/Csp-solar-15-mn-c-sun-1-320.jpg)

This document contains data measuring the cooling rate of a material as the diameter of a hole in the material is increased from 0.01 mm to 0.1 mm in increments of 0.01 mm or 0.02 mm. The cooling rate is reported in °C/min for each hole diameter when the material is cooled from 30°C. Smaller hole diameters resulted in higher cooling rates.
![C S P SOLAR 15 Mn *C
[D/d]^2*30 ‘C
D
M
d
M
Mn
*C
d
mm
30 0.01 270.00 10
30 0.02 67.50 20
30 0.03 30.00 30
30 0.04 16.88 40
30 0.0424 15.02 42.4
30 0.05 10.80 50
30 0.06 7.50 60
30 0.07 5.51 70
30 0.08 4.22 80
30 0.09 3.33 90
30 0.1 2.70 100](https://image.slidesharecdn.com/cspsolar15mncsun-160305015513/85/Csp-solar-15-mn-c-sun-1-320.jpg)