This paper discusses the placement of a microphone for feedforward based active noise control in a forced-air cooling system. Incorrect placement of microphones may lead to poor signal correlation that limit the ability of active noise suppression. Microphone placement can be by facilitated by direct on-line optimization of the Active Noise Control system. The feedforward based noise cancellati...

Measurement of the heat loss from equipment in buildings is necessary in order to make accurate assessments of its impact on cooling loads. Recent advances in the design of buildings and improvement of the thermal characteristics of insulation materials and building envelope systems have significantly reduced the cooling load from external sources; however, the addition of various types of offi...

In this study an experimental work was performed to examine the effect of porous media on the heat transfer from a cylindrical heater in the case of steady-state forced convection. Porous media consisted of Spherical glasses of diameter 0.6 cm and air was used as the cooling fluid. The bulk temperature was approximated by the inlet temperature and Properties of the air were found at the film te...

One of the most prominent industrial applications of heat transfer science and engineering has been electronics thermal control. Driven by the relentless increase in spatial density of microelectronic devices, integrated circuit chip powers have risen by a factor of 100 over the past twenty years, with a somewhat smaller increase in heat flux. The traditional approaches using natural convection...

A thermal lattice Boltzmann method (TLBM) is used for analysis of flow and heat transfer in two-dimensional channels. Simulation results are presented for thermal Couette and thermal Poiseuille channel flows. Analytical solution for temperature field in hydraulically and thermally developed flows are used to verify the current TLBM results. The method is further applied to study the forced conv...

A new micro heat spreader (MHS) concept for efŽ cient transport of large, concentrated heat loads is introduced. The MHS is a single-phase, closed micro uidic system, which utilizes reciprocating ̄ow forced convection. This micro uidic device has the potential to control transient heat loads by active control strategies. Hence, it can be utilized in various thermal management applications, mai...

In the semi-arid area of West Texas, drinking water is a precious commodity. Drinking water sources include water from Lake Meredith and groundwater from the Ogallala Aquifer. Water usage in this area includes farming and irrigation, municipal use or cooling water for electricity generation. As population continues to grow and water usage increases, especially during periods of drought, the ava...

The paper describes experiments with various superconducting type II cables and hollow conductor configurations, current distribution, size effect in superconductor and performance of multistranded superconducting stabilized cables and magnets. A 30 cm bore 70 kG split coil magnet with a total field energy of about 6 X lo6 joules currently being built at SLAC is presented and a new superconduct...