Description
and Operating principle
The heat pipe is composed of an aluminium block,
condenser (cooling fins) and copper tube connecting
the evaporator to the condenser. Cooling is
achieved by conduction through the aluminium
block and heat transfer through the fluid (evaporation
plus condensation) and fin network.
Heat pipes offer a very high thermal efficiency
allowing the extraction of high heat fluxes
from areas where conventional heat sinks are
not practical and transferring the unwanted
heat to where it can be more readily dissipated.
This facility opens up many possibilities for
the hard pressed designer.
Heat pipes are passive heat transfer systems,
without any moving parts and are highly reliable.
Their proven robustness is utilised in many
demanding railway traction applications.
Insulated
Heat pipes - HSM 87, HSM 92 for
Semiconductor Devices
Using ceramic tubes between the evaporator and
condenser (adiabatic zone ) and a dielectric
fluid provides electrical isolation between
these two parts, with no increase in thermal
resistance. This construction provides an electrical
isolation up to 9 kvolts continuous. The fluids
used, HFE 7 1 00, FC72 are environmentally safe.
In these applications, the electronic devices,
diodes and thyristors, are clamped between two
heatpipes
Heat
pipes – HSM57. HSM64 for
Semiconductor Devices
The
HSM57 provides a compact and lightweight forced
air cooled solution for cooling an inverter
which comprises four IGBT’s. The optimum
performance is achieved by manufacturing methods
which minimise the thermal resistance between
the various components of the heat pipe assembly
and utilising both water and methanol as the
heat transfer fluids.
Type
HSM64 is designed for operation in natural convection
and utilises the same production processes as
the HSM57 with fin spacing optimised for convection
air flow.
