Patent ID: 7591147

Claim:
A cooling jacket, comprising: a tube extending longitudinally along an axis, wherein said tube includes a wall and has an outside, an inside, and an inside length; a plurality of grooves incorporated along the circumference of said tube into said wall on said outside of said tube; and inside said tube a cooling jacket resistor, the cooling jacket resistor comprising: a passageway extending from a first end of the cooling jacket to a second end of said cooling jacket; wherein said passageway has a variable depth that inclines from said first end to said second end, such that refrigerant liquid present at said first end is gravitationally moved to said second end during operation or at rest of said cooling jacket resistor; wherein said passageway receives and transports a refrigerant liquid, and wherein said passageway resists the entrance of a refrigerant vapor; wherein said passageway is positioned inside said cooling jacket and extends for a first length in the direction of an axis, and wherein said depth is smallest at said first end and largest at said second end; and wherein said cooling jacket includes a drain port, said drain port enables draining of both condensed refrigerant and refrigerant vapor.