Method for operating a cooling system of a ship

Patent metadata

Field	Value
Publication number	US-10654554-B2
Application number	US-201715660666-A
Country	US
Kind code	B2
Filing date	Jul 26, 2017
Priority date	Jul 27, 2016
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A method for operating a cooling system of a ship, having a sea water part system with a sea water pump (14a, 14b) and at least one first cooling water circuit. The first cooling water circuit includes a bypass in a heat exchanger coupling the sea water part system and the first cooling water circuit and a control valve. A position of the control valve determines a cooling water proportion of the first cooling water circuit that is conducted via the heat exchanger and a cooling water proportion of the first cooling water circuit that is conducted via the bypass. The position of the control valve is controlled such that an advance cooling water temperature corresponds to a set point value. The rotational speed of the sea water pump is controlled based on the position of the control valve.

First claim

What is claimed is:

1. A method for operating a cooling system of a ship having a sea water part system with a sea water pump that is coupled to at least one first cooling water circuit by a first heat exchanger such that a cooling water of the first cooling water circuit is cooled by a sea water of the sea water part system in a region of the first heat exchanger, the first cooling water circuit has a heat exchanger bypass and a control valve that determines a first cooling water proportion of the first cooling water circuit that is conducted via the first heat exchanger and a second cooling water proportion of the first cooling water circuit that is conducted via the heat exchanger bypass, and a second cooling water circuit, wherein the second cooling water circuit and the first cooling water circuit are coupled via a second heat exchanger, in a region of which the cooling water of the second cooling water circuit is cooled by the cooling water of the first cooling water circuit, the second cooling water circuit includes a second heat exchanger bypass to the second heat exchanger coupling the second cooling water circuit and the sea water part system or the second cooling water circuit and the first cooling water circuit and a second control valve that determines a proportion of the second cooling water circuit that is conducted via the second heat exchanger and a cooling water proportion of the second cooling water circuit that is conducted via the heat exchanger bypass, the method comprising:
controlling a position of the control valve such that an advance cooling water temperature due to a mixture of the first cooling water proportion and the second cooling water proportion correspond to a set point value; controlling a rotational speed of the sea water pump based on the position of the control valve;
controlling a position of the second control valve such that a return cooling water temperature upstream of the second heat exchanger corresponds to a respective set point value; and
controlling the rotational speed of the sea water pump based at least in part on the position of the second control valve.

2. The method according to claim 1 , wherein the rotational speed of the sea water pump is controlled such that the first cooling water proportion increases towards a corresponding set point value.

3. The method according to claim 2 , wherein the rotational speed of the sea water pump is reduced.

4. The method according to claim 2 , wherein the rotational speed of the sea water pump is controlled based on a temperature of the sea water downstream of the first heat exchanger.

5. The method according to claim 1 , wherein the rotational speed of the sea water pump is controlled based on a temperature of the sea water downstream of the first heat exchanger.

6. The method according to claim 5 , further comprising:
Increasing the rotational speed of the sea water pump when the temperature of the sea water downstream of the first heat exchanger is greater than a limit value so that the temperature of the sea water becomes smaller than the limit value or equal to the limit value.

7. The method according to claim 1 , further comprising:
reducing the rotational speed of the sea water pump such that the first cooling water proportion of the first cooling water circuit that is conducted via the first heat exchanger increases towards a corresponding set point value, and the cooling water proportion of the second cooling water circuit that is conducted via the second heat exchanger of the second cooling water circuit becomes as large as possible and is approximated in the direction of a respective set point value.

8. The method according to claim 1 , wherein the first cooling water circuit further includes a cooling water pump, a low-temperature charge air cooler, at least one cooler for cooling at least one further assembly, and a further control valve configured to adjust a cooling water proportion of the first cooling water circuit conducted via the low-temperature charge air cooler, the method further comprising:
controlling a rotational speed of the cooling water pump of the first cooling water circuit based at least in part the position of at least one of the control valves.

9. The method according to claim 8 , wherein the rotational speed of the cooling water pump of the first cooling water circuit is controlled dependent on the position of the control valves of the first cooling water circuit such that the cooling water proportion of the first cooling water circuit conducted via the low-temperature charge air cooler increases towards a corresponding set point value.

10. The method according to claim 9 , wherein the rotational speed of the cooling water pump of the first cooling water circuit is controlled based at least in part on a temperature of the at least one cooler for cooling at least one further assembly.

11. The method according to claim 1 , wherein the second cooling water circuit and the first cooling water circuit are coupled via the second heat exchanger, the rotational speed of a cooling water pump of the first cooling water circuit is controlled based at least in part on the position of the control valve of the second cooling water circuit.

12. The method according to claim 1 , wherein the second cooling water circuit includes a high-temperature charge air cooler and a cooling water pump, wherein the rotational speed of the cooling water pump of the second cooling water circuit is controlled based at least in part on an internal combustion engine.

13. The method according to claim 1 , wherein the first cooling water circuit comprises a cooling water pump, a low-temperature charge air cooler, a high-temperature charge air cooler, at least one cooler for cooling at least one further assembly, and a first further control valve as well as a second further control valve, via a respective switching position of the first further control valve and the second further control valve a cooling water proportion conducted via the low-temperature charge air cooler and a cooling water proportion conducted via the high-temperature charge air cooler is adjustable, the method further comprising:
controlling a rotational speed of the cooling water pump of the first cooling water circuit based at least in part on the position of at least one control valve.

14. The method according to claim 13 , wherein the rotational speed of the cooling water pump of the first cooling water circuit is reduced such that the cooling water proportion conducted via the high-temperature charge air cooler increases towards a corresponding set point value.

Assignees

• Man Diesel & Turbo Se
• Man Energy Solutions Se

Inventors

• Hörmann Peter
• Gutmann Jürgen
• Xing Zhouxiang

Classifications

• F01P3/207

  liquid-to-liquid heat-exchanging relative to marine vessels · CPC title

• B63H21/383 Primary

  for handling cooling-water (in outboard drives B63H20/28; in machines or engines in general F01P3/00) · CPC title

• B63J2/12 Primary

  Heating; Cooling · CPC title

• B63J2002/005

  Intakes for coolant medium other than sea chests, e.g. for ambient water · CPC title

• B63B27/24

  of pipe-lines · CPC title