Search

DE-102016213787-B4 - Method for operating a ship's cooling system

DE102016213787B4DE 102016213787 B4DE102016213787 B4DE 102016213787B4DE-102016213787-B4

Abstract

Method for operating a cooling system (10) of a ship, wherein the cooling system (10) comprises a seawater subsystem (11) with a seawater pump (14a, 14b) and at least one first cooling water circuit (13); wherein the seawater subsystem (11) and the first cooling water circuit (13) are coupled via a heat exchanger (12) such that in the region of the heat exchanger (12) the cooling water of the first cooling water circuit (13) is cooled by the seawater of the seawater subsystem (11); and wherein the first cooling water circuit (13) has a bypass (17) to the heat exchanger (12) coupling the seawater subsystem (11) and the first cooling water circuit (13) and a control valve (18) whose position determines which portion of the cooling water of the first cooling water circuit (13) is routed through the heat exchanger (12) and which portion of the cooling water of the first cooling water circuit (13) is routed through the bypass (17), wherein the position of the control valve (18) is regulated such that a supply cooling water temperature, which is established by mixing the portion of the cooling water routed through the heat exchanger (12) and the portion of the cooling water routed through the bypass (17), corresponds to a corresponding setpoint. The speed of the seawater pump (14a, 14b) of the seawater subsystem (11) is controlled depending on the position of the control valve (18) of the first cooling water circuit (13), the position of which determines what proportion of the cooling water of the first cooling water circuit (13) is routed through the heat exchanger (12) and what proportion of the cooling water of the first cooling water circuit (13) is routed through the bypass (17), wherein the first cooling water circuit (13) comprises a cooling water pump (28a, 28b), a low-temperature charge air cooler (26), at least one cooler (32) for cooling at least one further assembly, and a further control valve (30), the switching position of which allows adjustment of the proportion of cooling water of the first cooling water circuit (13) routed through the low-temperature charge air cooler (26). The speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is regulated depending on the position of the control valve or each control valve (18, 30) of the first cooling water circuit (13).

Inventors

  • Peter HÖRMANN
  • Jürgen Gutmann
  • Zhouxiang Xing

Assignees

  • EVERLLENCE SE

Dates

Publication Date
20260513
Application Date
20160727

Claims (12)

  1. Method for operating a cooling system (10) of a ship, wherein the cooling system (10) comprises a seawater subsystem (11) with a seawater pump (14a, 14b) and at least one first cooling water circuit (13); the seawater subsystem (11) and the first cooling water circuit (13) are coupled via a heat exchanger (12) such that in the area of the heat exchanger (12) the cooling water of the first cooling water circuit (13) is cooled by the seawater of the seawater subsystem (11); The first cooling water circuit (13) has a bypass (17) to which the seawater subsystem (11) and the first cooling water circuit (13) are coupled, and a control valve (18) whose position determines what proportion of the cooling water of the first cooling water circuit (13) is routed through the heat exchanger (12) and what proportion of the cooling water of the first cooling water circuit (13) is routed through the bypass (17), wherein the position of the control valve (18) is regulated such that a supply cooling water temperature, which is determined by mixing the water flowing through the heat exchanger (12) the proportion of coolant supplied by the bypass (17) and the proportion of coolant supplied by the bypass (17) corresponds to a setpoint; characterized in that the speed of the seawater pump (14a, 14b) of the seawater subsystem (11) is controlled depending on the position of the control valve (18) of the first cooling water circuit (13), the position of which determines which portion of the cooling water of the first cooling water circuit (13) is routed via the heat exchanger (12) and which portion of the cooling water of the first cooling water circuit (13) is routed via the bypass (17), wherein the first cooling water circuit (13) comprises a cooling water pump (28a, 28b), a low-temperature charge air cooler (26), at least one cooler (32) for cooling at least one further assembly, and a further control valve (30), the switching position of which allows adjustment of the portion of the cooling water of the first cooling water circuit (13) routed via the low-temperature charge air cooler (26), and the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) depending on the position of the control valve(s) (18, 30) of the first cooling water circuit (13) is regulated.
  2. Procedure according to Claim 1 , characterized in that the speed of the seawater pump (14, 14b) is regulated, in particular reduced, in such a way as to depend on the position of the control valve (18) of the first cooling water circuit (13) that the cooling water fraction of the first cooling water circuit (13) which is passed through the heat exchanger (12) is made as large as possible and is thus brought closer to a corresponding setpoint.
  3. Procedure according to Claim 1 or 2 , characterized in that the speed of the seawater pump (14a, 14b) is further regulated depending on the temperature of the seawater downstream of the heat exchanger (12).
  4. Procedure according to Claim 3 , characterized in that when the temperature of the seawater downstream of the heat exchanger (12) becomes greater than a limit value, the speed of the seawater pump (14a, 14b) is increased so that the temperature of the seawater becomes less than or equal to the limit value.
  5. Procedure according to one of the Claims 1 until 4 , characterized in that the cooling system comprises a second cooling water circuit (20); the second cooling water circuit (20) and the seawater subsystem (11) or the second cooling water circuit (20) and the first cooling water circuit (13) are coupled via a heat exchanger (21), in the area of which the cooling water of the second cooling water circuit (20) is cooled by the seawater or the cooling water of the first cooling water circuit (13); The second cooling water circuit (20) has a bypass (22) to the heat exchanger (21) coupling the second cooling water circuit (20) and the seawater subsystem (11) or the second cooling water circuit (20) and the first cooling water circuit (13), and a control valve (23) whose position determines what proportion of the cooling water of the second cooling water circuit (20) is routed through the heat exchanger (21) and what proportion of the cooling water of the second cooling water circuit (20) is routed through the bypass (22), wherein the position of the control valve (23) of the second cooling water circuit is regulated such that a return cooling water temperature upstream of the heat exchanger (21) of the second cooling water circuit (20) corresponds to a corresponding setpoint; the speed of the seawater pump (14a, 14b) of the seawater subsystem (11) is further regulated depending on the position of the control valve (23) of the second cooling water circuit (20).
  6. Procedure according to Claim 5 , characterized in that the speed of the seawater pump (14a, 14b) is regulated, in particular reduced, such that, on the one hand, the cooling water fraction of the first cooling water circuit (13) passing through the heat exchanger (12) of the first cooling water circuit (13) is as large as possible and thus approximated towards a corresponding setpoint, and that, on the other hand, the cooling water fraction of the second cooling water circuit (20) passing through the heat exchanger (21) of the second cooling water circuit (20) is as large as possible and thus approximated towards a corresponding setpoint.
  7. Procedure according to one of the Claims 1 until 6 , characterized in that the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is regulated in such a way as to depend on the position of the control valves (18, 30) of the first cooling water circuit (13) that the cooling water fraction of the first cooling water circuit (13) which is routed via the low temperature charge air cooler (26) is made as large as possible and is thus brought closer to a corresponding target value.
  8. Procedure according to Claim 1 or 7 , characterized in that the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is further controlled depending on the temperature of at least one cooler (32) for cooling at least one further assembly.
  9. Procedure according to one of the Claims 5 or 6 and one of the Claims 1 , 7 or 8 8, characterized in that the second cooling water circuit (20) and the first cooling water circuit (13) are coupled via the heat exchanger (21) of the second cooling water circuit (20), the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is additionally controlled depending on the position of the control valve (23) of the second cooling water circuit (20).
  10. Procedure according to one of the Claims 5 until 9 , characterized in that the second cooling water circuit (20) comprises a high-temperature charge air cooler (27) and a cooling water pump (33), wherein the speed of the cooling water pump (33) of the second cooling water circuit (20) is controlled depending on the internal combustion engine.
  11. Procedure according to one of the Claims 1 until 4 , characterized in that the first cooling water circuit (13) comprises a cooling water pump (28a, 28b), a low-temperature charge air cooler (26), a high-temperature charge air cooler (27), at least one cooler (32) for cooling at least one further assembly, and a further control valve (30), as well as a further control valve (37), the switching position of which allows adjustment of the cooling water portion routed through the low-temperature charge air cooler (26) and the cooling water portion routed through the high-temperature charge air cooler (27); the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is controlled depending on the position of one or each control valve (18, 30, 37) of the first cooling water circuit (13).
  12. Procedure according to Claim 11 , characterized in that the speed of the cooling water pump (28a, 28b) of the first cooling water circuit (13) is regulated, in particular reduced, in such a way that the proportion of cooling water passed through the high temperature charge air cooler (27) is as large as possible and is thus brought closer to a corresponding target value.

Description

The invention relates to a method for operating a cooling system of a ship according to the preamble of claim 1. The basic structure and operation of a ship's cooling system are well known to the expert in question from practical experience and are schematically represented in 6 As shown, a cooling system 10 of a ship comprises a seawater subsystem 11 with a seawater pump 14 and at least one cooling water circuit 13 with a cooling water pump 28. The seawater subsystem 11 and the cooling water circuit 13 are coupled via a heat exchanger 12 such that, in the region of the heat exchanger 12, the cooling water of the first cooling water circuit 13 is cooled by the seawater of the seawater subsystem 12. The first cooling water circuit 13 has a bypass 17 to the heat exchanger 12, which couples the seawater subsystem 11 and the first cooling water circuit 13, and a control valve 18, the position of which determines what portion of the cooling water of the first cooling water circuit 13 is routed via the heat exchanger 12 and what portion of the cooling water of the first cooling water circuit 13 is routed via the bypass 17. The position of the control valve 18 is changed via an actuator 19 and determined by a controller 41 such that the supply cooling water temperature, which is achieved by mixing the cooling water portion routed via the heat exchanger 12 and the cooling water portion routed via the bypass 17, corresponds to a setpoint value. The cooling water can then be supplied to a component 42 to be cooled at this supply cooling water temperature. In cooling water systems 10 known from practice according to 6 Accordingly, a sensor 43 measures the actual value of the supply cooling water temperature, and depending on this value, the controller 41 influences the position of the control valve 18 via the actuator 19. In typical ship cooling systems, the seawater pump 14 of the seawater subsystem 11 and the cooling water pump 28 of the first cooling water circuit 13 are operated at full speed. This results in a relatively high energy consumption. The JP 2002 - 274 493 A , the KR 10 2010 0 080 566 A and the KR 10 2012 0 015 402 A reveal the cooling systems of a ship. Based on this, the present invention aims to create an energy-saving method for operating a ship's cooling system. This problem is solved by a method for operating a ship's cooling system according to claim 1. According to the invention, the speed of the seawater pump of the seawater subsystem is controlled depending on the position of the control valve of the first cooling water circuit, the position of which determines what proportion of the cooling water of the first cooling water circuit is routed through the heat exchanger and what proportion is routed through the bypass. The primary control variable for regulating the speed of the seawater pump of the seawater subsystem is therefore the position of that control valve of the first cooling water circuit which determines what proportion of the cooling water of the first cooling water circuit is routed through the heat exchanger and what proportion is routed through the bypass. The control of this control valve of the first cooling water circuit, which is known from practice and depends on the actual value of the supply cooling water temperature, remains active. The control concept according to the invention has the advantage that energy can be saved by varying the speed of the seawater pump. The control concept is particularly suitable for use in cooling systems where the heat exchanger, which couples the seawater subsystem and the first cooling water circuit, is not designed as a central heat exchanger. Preferably, the speed of the seawater pump in the seawater subsystem is regulated according to the position of this control valve in the first cooling water circuit such that the proportion of cooling water from the first cooling water circuit passing through the heat exchanger is maximized and thus approximated to a corresponding setpoint. When as much cooling water as possible passes through the heat exchanger, i.e., when the proportion of cooling water from the first cooling water circuit passing through the heat exchanger is maximized, the speed of the seawater pump can be reduced further, resulting in greater energy savings. According to the invention, the first cooling water circuit comprises a cooling water pump, a low-temperature charge air cooler, at least one radiator for cooling at least one further assembly, and a further control valve, the switching position of which allows adjustment of the cooling water portion of the first cooling water circuit routed through the low-temperature charge air cooler. The speed of the cooling water pump of the first cooling water circuit is regulated depending on the position of the control valve(s) of the first cooling water circuit, preferably such that the cooling water portion of the first cooling water circuit routed through the low-temperature char