This paper deals with a particular miniature two-phase loop named Periodic Two-Phase Thermosyphon (PTPT), whose operation is periodic. A Periodic two-phase thermosyphon allows remote condensation and broad flexibility in the mutual displacement of the evaporator with respect to the condenser. In addition, a PTPT allows the overall dimensions of the evaporator to be drastically reduced, and allows it to be placed close to the electronic equipment; it is suitable for high density packaging thermal control applications. In this paper the authors have experimentally compared the performance of two mini-PTPT prototypes which operate at high frequency (0.016 Hz) with those obtained by 4 high performance commercial devices which are designed to be implemented on the surface of a Pentium© IV processor. The PTPT device shows a specific thermal resistance of 5.1 K cm2/W, about twice those measured with commercial devices, but similar to other capillary thermal loops (LHP). These devices show that their performance is not influenced by the tilt angle of the heating surface. The dynamic response of these devices is influenced by the operational frequency. In the case of compact high frequency operating PTPT, the dynamic response is quicker than with other capillary loops such as LHP and CPL, and similar to that of heat pipe cooling devices, which do not allow remote condensation. The PTPT device can really be a low cost solution for compact thermal control application.
Performance of High Frequency Periodic Two-Phase Thermosyphons for Electronic Cooling Applications
FILIPPESCHI, SAURO;SALVADORI, GIACOMO
2007-01-01
Abstract
This paper deals with a particular miniature two-phase loop named Periodic Two-Phase Thermosyphon (PTPT), whose operation is periodic. A Periodic two-phase thermosyphon allows remote condensation and broad flexibility in the mutual displacement of the evaporator with respect to the condenser. In addition, a PTPT allows the overall dimensions of the evaporator to be drastically reduced, and allows it to be placed close to the electronic equipment; it is suitable for high density packaging thermal control applications. In this paper the authors have experimentally compared the performance of two mini-PTPT prototypes which operate at high frequency (0.016 Hz) with those obtained by 4 high performance commercial devices which are designed to be implemented on the surface of a Pentium© IV processor. The PTPT device shows a specific thermal resistance of 5.1 K cm2/W, about twice those measured with commercial devices, but similar to other capillary thermal loops (LHP). These devices show that their performance is not influenced by the tilt angle of the heating surface. The dynamic response of these devices is influenced by the operational frequency. In the case of compact high frequency operating PTPT, the dynamic response is quicker than with other capillary loops such as LHP and CPL, and similar to that of heat pipe cooling devices, which do not allow remote condensation. The PTPT device can really be a low cost solution for compact thermal control application.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
