Two-stage evaporator unit

US5823252A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Peter Waitkat · Bad Liebenzell, DE
• Uwe Benz · Giengen an der Brenz, DE
• Johann Einhart · Überlingen, DE

Key dates

• Filing date: Jul 28, 1995
• Grant date: Oct 20, 1998
• Expiry date: Jul 28, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/50
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A two-stage evaporator unit converts a liquid reactant mass flow adjustable as a function of a load presetting into a gaseous reactant mass flow. The liquid reactant mass flow is at least partially evaporated in the first stage by a heat-exchange medium, and, if appropriate is completely evaporated and subsequently superheated in the second stage. The evaporator unit is formed by the alternating stacking one on the other of foils having heat-exchange channels and by foils having reaction channels that, in each case, have at least one first and one second stage integrated in one foil. The first stage is configured as a channel with a minimized cross-sectional area which is directly connected to the inflow conduit. The first stage is operated at high coefficients of heat transmission. The total cross-section of the reaction channels in the second stage increases in the flow direction.