Page 80 - Power Electronics Handbook
P. 80
Liquid cooling 73
equipment layout, operating in the range +u)"C to +uK)"C, although the
range -200°C to +6WC can be covered if necessary.
Two equations are used in the design of a heat pipe. The maximum heat
transport capability QM of the pipe is given by equation (2.16), where d is
the inside diameter of the pipe, f is the length from condenser to
evaporator, and K is a CollSfpIIt which is dependent on the heat pipe
geomeay, the wick material, the working fluid and the orientation of the
pip. The maximum temperature difference between the evaporator and
condenser for a power of Q is given by equation (2.17), where UE is the
evaporator area, a, the condenser area, and b a constant dependent on the
CoIlfieurPtioLl of the pipe. Equation (2.17) is used to obtain an approximate
design for a heat pipe which must then be tested and modified.
K dZ
QM = 7 (2.16)
(2.17)
