Rawinsonde data collected from the Atlantic Stratocumulus Transition Experiment (ASTEX) were used to investigate the mean and temporal characteristics of large-scale heat and moisture budgets for a 2-week period in June 1992. During this period a large apparent heat sink and an apparent moisture source were observed near inversion base. Analyses from other budget studies show that similar conve...

Many of the more recent applications of PowerMOS transistors, particularly low voltage devices, have been as solenoid drivers. In this type of application the device is simply used as a switch to turn the current through a solenoid, relay or other inductive load on and off (Figure 1). Since the dissipation is low, a very small or no heat sink will be required. This note will cover the applicati...

In order to compare the performance of the carbon dioxide and HFC-125 heat pumps for medium-and high-temperature heating, both heat pump cycles were optimized using a simulation method. To fairly compare the performance of the cycles by using different working fluids, each cycle was optimized from the viewpoint of heating COP by two design parameters. The first is the gas cooler exit temperatur...

This paper describes two methodologies for increasing the actuation speed of the shape memory alloy (SMA) actuator in ambient environment. The first method involves the implementation of a simple, light-weight heat sink, which consists only of a combination of an outer metal tube with the silicone grease, but able to cool the heated alloy effectively. The second method describes a high current ...

The presented work analyses the design space and performance potential of microfabricated Brayton cycle and Rankine cycle devices, accounting for lower component efficiencies, temperatures limited by the material properties and system implementation constraints imposed by silicon microfabrication and miniaturization. By exploring the design space of such microsystems, their potential thermal ef...

Details of design and fabrication of a beamline RF load suited to accommodate SRF cavities are presented. Bonding an RF absorber to a heat sink is the key aspect of the load. Production loads have been effectively tested to 10.8 kW and operated in situ up to 3 kW.

Due to the high performance of electronic components, the heat generated is increasing dramatically and cooling system for such components becomes one of the most important issues to dissipate heat that generated in electronic component. In the present analysis, a microchannel heat sink configuration is simulated by modelling the stacked microchannel heat sinks in macroscopic scale as if it is ...

We introduce a class of anchoritic sensor networks, where communications between sensor nodes is undesirable or infeasible, due to, e.g., harsh environment, energy constraints, or security considerations. Instead, we assume that the sensors buffer the measurements of the physical phenomena over the lifetime, and report measurements directly to a sink (note that “report” does not necessarily req...

Suppose that the velocity field is inversely proportional to the radial distance, v = Q 2πr . Such a divergenceless field is natural in two dimensions and is generated by a point sink (or source) of strength Q in an incompressible fluid. This flow field has the remarkable property that the convection term can be absorbed into the diffusion operator by an appropriate shift of the spatial dimensi...

This study provides a comprehensive methodology for optimizing the design of a twophase micro-channel heat sink. The heat sink parameters are grouped into geometrical parameters, operating parameters, and thermal/fluid parameters. The objective of the proposed methodology is to optimize micro-channel dimensions in pursuit of acceptable values for the thermal/fluid parameters corresponding to a ...