In this paper, a careful theoretical analysis of the thermal dynamics an electronic device and its package was carried out in order to study problem equivalent circuit implementation. It found that temperature evolution time is ruled by infinite convergent series constants. The knowledge first n terms time-constant spectrum obtained from transient measurements allows complete characterization suitable reliable structured as Cauer low-pass network with cells. total resistance therefore...

For pt.I see ibid., vol.13, no.6, p.1208-19 (1998). The TRAIT method for thermal characterization of electronic devices, whose theory was exposed in part I one-dimensional (1-D) structures, here applied to systems having heat fluxes with three-dimensional (3-D) dependence order demonstrate that the spatial resolution resistance analysis is still qualitatively maintained this type structure too. analytical procedure first simulated structures temperature transients and steady-state fields...

The equations of the steady, adiabatic, one-dimensional flow an equilibrium mixture a perfect gas and incompressible particles, in constant-area ducts with friction, are derived taking into account effects gravity finite volume particles. As is case for pure gas, shown to be subject phenomenon choking, possibility adiabatic heating subsonic expansion also theoretically predicted certain inlet conditions. model may used approximately describe conditions existing portions volcanic conduits...

An important option to transport the gas is convert it into liquid natural (LNG) and convey using insulated LNG tankers. At receiving terminals, offloaded storage tanks then pumped at required pressure vaporized for final transmission pipeline. The production process consumes a considerable amount of energy, while cold availability, as also known has been stored in LNG. terminal, needs be evaporated environmental temperature before fed distribution system. Seawater commonly used...

For the combined power plants, optimization of heat recovery steam generator (HRSG) is particular interest in order to improve efficiency from turbine exhaust gas and maximize production cycle. The thermodynamic first step a plant design process. aim this paper provide tools for optimal selection operative parameters HRSG, starting which detailed its variables can be carried out. analysis, selected objective minimization thermal exergy losses, taking into account only irreversibility due...

The present work aims at identifying the relative influence of GSHP subsystems (viz.ground source, earth heat exchangers, pump unit, pumping devices) on overall efficiency and limits to which technological improvements should be pushed (because, beyond these limits, only minor benefits may achieved).To this end, an analysis thermodynamic losses is conducted for a case study, followed by sensitivity unit thermal performance.Primary energy consumptions nine configurations with different...

This paper presents a steady-state thermal simulation strategy called DJOSER, which is dedicated primarily but not exclusively to packaging structures for electronic devices. It applicable that can be likened set of homogeneous layers stacked one on top the other and possibly separated by contact resistances, where dissipated powers are due two-dimensional heat sources distributed interfaces between layers. A broad range contour conditions types included make models as close possible typical...

Two types of insulated metal substrates for surface mounting technology (SMT) automotive applications were thermally examined by means the TRAIT method [P.E. Bagnoli, C. Casarosa, M. Ciampi, E. Dallago, Thermal resistance analysis induced transient (TRAIT) power electronic devices thermal characterization. Part I: fundamentals and theory, IEEE Transactions in Power Electronics 13 (1998) 1208–1219]. The results showed a noticeably lower static than other solutions commonly used. Moreover,...

Abstract The lack of airworthiness and certification criteria for the employment UAV vehicles in civilian field has caused an uncontrolled proliferation projects construction a number prototypes which differ dimension, weight, flight characteristics payload carriage. This paper is aimed at identifying most important project may concur to unifying main characteristics. In particular, minimum take‐off weight investigated able guarantee adherence levels safety required by design requirement...

Abstract The geothermal convector (GTC) is an unconventional system for heat extraction from a aquifer without fluid withdrawal. In this special two-phase thermosyphon used. This device works with downhole evaporator and condenser at the ground level. shares advantages disadvantages other exchanger plants; instance, second well to return water aquifier not required. Because of limitations natural heal flow in hot aquifer, however, most suitable small-to moderate-size applications. article,...

In this paper an analytical model for the steady-state temperature mapping of electronic devices and system boards is presented. The main assumptions are that heat generation may be considered as two-dimensional whole solid structure can schematically modelled a stack several homogeneous layers different materials sizes, also with various degree asymmetry. This mathematical believed to replace conventional finite-elements (FEM) thermal simulators fast mapping, accurate within 1% able run in...