Ship Cooling System Pump Speed Control via Heat Exchanger Bypass
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Solution Overview
Problem
Conventional ship cooling systems require significant energy due to operating sea water and cooling water pumps at full rotational speed, leading to inefficiencies and increased energy consumption.
Innovation Solution
The method involves controlling the rotational speed of the sea water pump based on the position of the control valve in the cooling water circuit, maximizing the cooling water proportion through the heat exchanger to reduce energy usage, and adjusting pump speed according to sea water temperature to prevent salt deposits and maintain optimal cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sea water pump and cooling water pump are operated at full rotational speed, then cooling performance is ensured, but energy consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the pump rotational speeds variable rather than fixed at full speed. The control device adjusts the rotational speed of the sea water pump and cooling water pump dynamically based on actual cooling requirements, allowing the system to transition from static high-consumption operation to dynamic optimized operation that balances cooling performance with energy efficiency.
Solution Approach 2:
The patent changes the operational parameters of the pumps by adjusting their rotational speeds according to actual cooling demands. Instead of operating at constant full speed, the system varies the rotational speed parameters of both pumps based on feedback from temperature sensors and cooling water proportion measurements, thereby reducing energy consumption while maintaining adequate cooling performance.
2Loss of energy
If cooling water proportion through heat exchanger is maximized, then energy saving is achieved, but salt deposits may form in cooler
Solution Approach 1:
The patent implements feedback control by using sensors to detect sea water temperature and cooling water proportion, then feeding this information back to the control device. The control device adjusts pump rotational speeds based on this feedback, ensuring that cooling water proportion is optimized for energy saving while maintaining parameters that prevent salt deposit formation in the cooler.
Solution Approach 2:
The patent replaces purely mechanical full-speed pump operation with a controlled system that uses sensors and control devices to regulate pump speeds. This substitution of mechanical operation with sensor-based control allows for precise optimization of cooling water proportion through the heat exchanger while preventing harmful salt deposits through monitored parameter adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption by optimizing pump speed based on cooling water proportion and sea water temperature, while ensuring effective cooling and preventing salt deposits, thereby enhancing energy efficiency and system performance.
Implementation Method 1
The sea water part system 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 sea water of the sea water part system 12
Data Source
AI summary
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.