Patent ID: 7024880
Filing Date: 2006-04-11
Classification: F25B,F25C,F25D,Y02A,Y02B

Abstract:
1. An apparatus including: (a) an elongated evaporator tube having a generally cylindrical outer surface with a heat transfer feature formed thereon, the heat transfer feature including a projection extending from the outer surface of the evaporator tube; (b) a driving vessel charged with liquid ammonia and a driving gas at an operating pressure and temperature; (c) a heat source adapted to apply sufficient heat to the driving vessel to force liquid ammonia through an evaporator supply line to an expansion chamber inlet associated with the evaporator tube; (d) a return system facilitating the return of ammonia from an expansion chamber outlet of the evaporator tube to the driving vessel; and (e) a target material reservoir having a central opening extending there through, the central opening having a first portion with a size and shape closely corresponding to the cylindrical outer surface of the evaporator tube, and also having a second portion comprising an elongated slot having a shape closely corresponding to an outer surface of the projection.