The purpose of this paper is to present an alternative to the expansion devices currently used in automotive refrigerant systems. This paper will examine the improvements that are now possible at high ambient temperature conditions by using a variable orifice tube. The improvements include significantly lower evaporator discharge air temperatures and lower refrigerant charge amounts. The proposed new expansion device used in a Cycling Clutch Orifice Tube (CCOT) system will raise the high ambient performance to that of a Cycling Clutch Thermostatic eXpansion Valve (CCTXV) system. The variable orifice tube embodies the best operating features of the expansion valve system (idling operation), and that of the fixed orifice tube system (highway speed performance, low cost and high reliability). This paper will conclude with a discussion of the design and control features of this proposed new device. The variable orifice tube is controlled with condenser refrigerant discharge fluid temperatures and has proven to be more stable than an expansion valve.
Variable orifice tube performance in automotive refrigerant systems
Verhalten von Rohren mit variablem Querschnitt in Auto-Kühlsystemen
1995
6 Seiten, 12 Bilder
Conference paper
English
Rohrwärmetauscher , Fahrzeugbeheizung , Kühlsystem , Leistungssteigerung , Temperaturabhängigkeit , Umgebungstemperatur , Querschnitt , Metallrohr , Verdampfer , Kältemittel , Wärmedehnung , Leerlauf , Betriebseigenschaft , Konstruktionsdaten , Steuerungs- und Regelungssystem , Dampfkondensation , Strömungsvorgang , Sicherheitsarmatur
Variable orifice tube performance in automotive refrigerant systems
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