C O N T E N T S

Abstract. Micro-combined heat and power systems are gaining
more and more interest for domestic use. Reflections on the choice of the
thermal engine are presented.
Key words: Micro-CHP, cogeneration, engine, Stirling, Ericsson,
ORC.
ENGINE AIR-CHARGE REGRESSION MODEL
by
DANIEL DINESCU and MOHAND TAZEROUT
Abstract. A physically based regression model for predicting the
intake flow in an IC engine is presented. The effect of the intake
manifold conditions (pressure and temperature) and engine speed and
geometry on the incoming mass flow-rate is considered. The proposed
model is computationally simple and involves parameters that can be
easily measured. It may be therefore suitable for engine control.
Key words: internal combustion engine, intake mass flow rate,
mean value modelling, regression model.
UNE MODÉLISATION DU TRANSFERT DE CHALEUR ET DE
MASSE AU SERPENTINES DE TUYAUX GAUFRÉS DES
CHAUDIÈRES À CONDENSATION
par
DAN PAUL STĂNESCU, NICOLAE N. ANTONESCU
et NICULAE ANTONESCU
Abstract. Heat and mass transfer modeling for goffered tubes
used for condensing boilers. A very efficient constructive solution
for condensing boilers with serpentine pipe is based on the use of
goffered tubes. The boiler’s particularity is the construction with
only one continuous serpentine pipe placed vertically in the boiler.
For the final whirls the heat transfer is represented by both latent
and sensible convection from the flue gases. For this specific
constructive solution, a numerical model was developed, based on
several physical models for heat and mass transfer over condensing
surfaces. The numerical model was finally verified through
laboratory experimentations on real goffered tubes, single
serpentine pipe, condensing boilers of 30 and 100 kW. The
measured parameters were in good agreement with those obtained