C O N T E N T S

PLANT
by
TEONA LOZONSCHI
Abstract. Venting and pressurization of enclosed compartments due
to the accidental rupture of coolant piping is a safety problem common to
many nuclear facilities, mainly in a seismic event. The processes
associated with such an accident are very complex, involving, in general,
transient multiphase flows, interactions and mixing between the
incoming flows and gases in the compartment, and heat transfer with
surroundings. The objective of this paper is to present a simplified,
global analysis approach which can provide reasonably conservative
estimates of structural loads and flow processes, and which can be
readily be used in design studies.
Key words: pressurization, coolant piping, multiphase coolant
flows, heat transfer, structural loads, flow processes.
ANALYSE THÉORIQUE ET ÉXPERIMENTALE D’UNE
MACHINE À FROID DE STIRLING
by
STOIAN PETRESCU, LAVINIA GROSU, MONICA COSTEA,
PIERRE ROCHELLE, CĂTĂLINA DOBRE and CAMELIA PETRE
Abstract. The paper presents a theoretical and experimental study
of the reverse Stirling cycle applied to a β type machine. It is based on
analytical models developed for refrigeration machines by using the
methods from Finite Speed Thermodynamics (FST) and Finite Physical
Dimensions Thermodynamics (FDT). The theoretical results are
compared to experimental ones. The effect of the piston speed on the
COP of the real operation machine is emphasized. Although the heat
losses due to imperfect regeneration are differently evaluated, the two
methods present similar performance variation.
Key words: reverse Stirling cycle, finite speed thermodynamics,
finite physical dimensions thermodynamics, direct method, irreversibility
causes.
PERFORMANCES D’UNE MACHINE FRIGORIFIQUE MUNIE