Method and arrangement for waste cold recovery in a gas-fueled sea-going vessel

1. A fuel storage and distribution system for a gas-fueled sea-going vessel, comprising:

a gas tank for storing gas fuel, a portion of which is in liquefied form,

a tank room that constitutes a gastight space enclosing tank connections to and from the tank room and valves associated with the connections,

a part of a refrigeration or air conditioning circuit reaching into said tank room, and

a first local heat transfer circuit in the tank room, which first local heat transfer circuit is configured to receive heat from said part of the refrigeration or air conditioning circuit in said tank room, wherein

in that the fuel storage and distribution system further comprises

in its first local heat transfer circuit a first local heat transfer re-boiler and a first local heat transfer condenser, and wherein part of the refrigeration or air conditioning circuit constitutes a hot element within said first local heat transfer re-boiler, and arranged to transfer such received heat to liquefied gas fuel handled in the first local heat transfer re-boiler and the first local heat transfer condenser in said fuel storage and distribution system,

a pipe leading gas fuel through a cold element within said first local heat transfer condenser and

a part of an engine cooling circuit reaching into said tank room;

a second local heat transfer circuit in the tank room, which second local heat transfer circuit comprises a second local heat transfer re-boiler and a second local heat transfer condenser, wherein part of the engine cooling circuit constitutes a hot element within said second local heat transfer re-boiler, and which second local heat transfer circuit is receiving heat from said part of the engine cooling circuit in said tank room and transferring such received heat to liquefied gas fuel handled in the second local heat transfer re-boiler and the second local heat transfer condenser in said fuel storage and distribution system,

a pipe leading gas fuel through a cold element within said second local heat transfer condenser.

2. The fuel storage and distribution system according to claim 1 , comprising selection valves for selectively leading gas fuel either through the cold elements in said first and second local heat transfer condensers in sequence, or through only one of said cold elements.

3. The fuel storage and distribution system according to claim 2 , comprising a pressure build-up (PBU) circuit, a part of which constitutes a PBU cold element in at least one of said first local heat transfer condenser or said second local heat transfer condenser.

4. The fuel storage and distribution system according to claim 3 , wherein said PBU circuit is a closed loop configured to lead fluid heating medium through:

said PBU cold element in at least one of said first local heat transfer condenser or said second local heat transfer condenser, and

a heating element located inside the gas tank.

5. The fuel storage and distribution system according to claim 3 , wherein said PBU circuit is an open loop configured to lead gas fuel from the gas tank to said PBU cold element in at least one of said first local heat transfer condenser or said second local heat transfer condenser, and back to said gas tank.

6. The fuel storage and distribution system according to claim 1 , wherein said part of the refrigeration or air conditioning circuit is a part of a circulation loop for liquid heat transfer medium.

7. The fuel storage and distribution system according to claim 6 , comprising:

a thermally insulated buffer tank for temporarily storing an amount of said liquid heat transfer medium, and

controllable valves for controlling a flow of said liquid heat transfer medium in to and out of said buffer tank.

8. The fuel storage and distribution system according to claim 1 , wherein said part of the refrigeration or air conditioning circuit is a part of a circulation loop for evaporable refrigerant.

9. The fuel storage and distribution system according to claim 8 , comprising:

a thermal accumulator and

controllable valves for controlling flow of said evaporable refrigerant through said thermal accumulator.