Online proceedings - EDA Publishing Association

24-26 September 2008, Rome, ItalyFig.3: Device scheme, lateral view.To check the fluid operating temperature a thinthermocouple was introduced into the dissipater’schamber. The whole dissipater was thermallyinsulated to avoid heat loss other than those from thecondenser where a fan was placed to improve thevapour condensation.Thermocouples were plug in an acquisition datasystem, Ahlborn-Almeno, who transferred theinformation to a PC for their display. The test benchset-up is shown in figure 4.Fig.4: Test bench set-up.Data recording is made every 10 seconds until thesteady state is reached.For each heat and liquid load, temperature valuesare plotted to be able to analyse the dissipateroperation. Whether the liquid is completelyevaporated or no evaporation at all has happened thedissipater operates inefficiently, being the heatremoved by conduction through the system walls. Insuch a case temperature drastically decreases fromthe evaporator to the condenser. This temperatureprofile is considered as dissipater conduction pattern.When the optimum heat and liquid load combinationis obtained the system operates efficiently and a lighttemperature drop is observed between the evaporatorand condenser.Figure 5 shows this conduction pattern. From itfurther analysis and tests are being carried out tomake the system operate as a phase changedissipater with a minimum thermal resistance.©EDA Publishing/THERMINIC 2008 99ISBN: 978-2-35500-008-9