Patent ID: 9170055
Filing Date: 2015-10-27
Classification: F28D,F28F

Abstract:
1. A tube bundle heat exchanger for cooling a first medium flow with a cooling medium flow, the heat exchanger comprising: a plurality of heating surface tubes adapted to receive and channel the first medium flow, each of the heating surface tubes having oppositely disposed end portions held in a tubesheet; a pressure shell enclosing the heating surface tubes, the pressure shell defining a shell side adapted to receive and channel the cooling medium flow; at least one tube inlet chamber adapted to direct the first medium flow into the heating surface tubes, and at least one tube outlet chamber adapted to collect the first medium flow from the heating surface tubes; first and second nozzles disposed at a rear end of the pressure shell adjoining the tube outlet chamber, the first nozzle being adapted to lead in the cooling medium flow and the second nozzle being adapted to lead away the cooling medium flow; third and fourth nozzles disposed at a front end of the pressure shell adjoining the tube inlet chamber, the third nozzle being adapted to lead in the cooling medium flow and the fourth nozzle being adapted to lead away the cooling medium flow; a first three-way valve defining a first port, a second port and a third port, a feed pipe connected to the first port and configured to supply the cooling medium flow to the first port, a first bypass pipe extending between the third nozzle and the second port, and a second bypass pipe extending between the first nozzle and the third port; a second three-way valve defining a fourth port, a fifth port and a sixth port, a drain pipe connected to the sixth port and configured to discharge the cooling medium flow from the sixth port, a third bypass pipe extending between the fourth nozzle and the fourth port, and a fourth bypass pipe extending between the second nozzle and the fifth port; the first three-way valve and the second three-way valve being controllable to selectively change the heat exchanger from counter-current flow to co-current flow and from co-current flow to counter-current flow, and the first three-way valve being controllable to selectively regulate flow of the cooling medium through the first bypass pipe and the second bypass pipe, and the second three-way valve being controllable to selectively regulate flow of the cooling medium through the third bypass pipe and the fourth bypass pipe; and wherein the second three-way valve is configured to control a temperature of the cooling medium discharged through the sixth port.