Naslov
A Simple Model of a Thermostatic Expansion Valve Suitable for Control Purposes

Autori
Pavković, Branimir

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
CADAM 2004 : book of abstracts / Obsieger, Boris - Ičići : Zigo, 2003

Skup
2nd International Conference on Computer Aided Design and Manufacturing

Mjesto i datum
Šibenik, Hrvatska, 28.09.2004. - 01.10.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
modeling; refrigeration system; thermostatic expansion valve; transients

Sažetak
The thermostatic expansion valve model, suitable for control purposes is developed as a part of a dynamic model of a refrigeration machine. A set of experimentally acquired values is used to determine coefficients of polynomials describing valve needle displacement and the refrigerant flow area for any combination of evaporator leaving refrigerant pressure, bulb temperature and position of a static superheat adjustment screw. Refrigerant mass flow is evaluated with known flow area and pressure difference between condenser and the evaporator of a refrigeration machine. Bulb dynamics is taken into account through the exponential function, using the bulb time constant, which was determined experimentally. It has been shown that simulation results correspond well with data achieved by measurement on a real refrigeration system.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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