Modular refrigeration system, e.g., for ships
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Solution Overview
Problem
Existing refrigeration systems in ships require complex connections and specialized personnel for maintenance, leading to operational challenges and the need for frequent shore-based servicing due to their complexity and the requirement for large standby systems to ensure adequate refrigeration during extended offshore periods.
Innovation Solution
A self-enclosed modular refrigeration unit with a compressor, heat exchanger, head pressure control valve, and connections to a cooling water network, allowing for easy replacement and integration with a refrigeration unit cooler, enabling decentralized operation and simplified maintenance without specialized tools or training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large stand-by refrigeration systems are used to ensure adequate refrigeration during extended offshore periods, then refrigeration reliability is improved, but device complexity increases
Solution Approach 1:
The refrigeration system is divided into multiple independent modular units, each capable of operating autonomously. Each module contains its own compressor, condenser, evaporator, and control systems, allowing the system to be segmented into replaceable functional blocks that maintain reliability through redundancy while reducing overall complexity through standardization.
Solution Approach 2:
The system enables easy modification of operational parameters such as refrigerant type, cooling capacity, and operating temperature ranges by simply replacing modular components rather than redesigning the entire system. This allows adaptation to different offshore conditions without increasing structural complexity.
2Reliability
If complex packaged refrigeration units are used, then refrigeration performance is improved, but ease of repair deteriorates
Solution Approach 1:
The system is segmented into standardized modular units with uniform connection interfaces and mounting configurations. Each module can be independently removed and replaced without affecting other parts of the system, enabling non-specialized personnel to perform maintenance by simply swapping modules rather than diagnosing and repairing complex integrated systems.
Solution Approach 2:
The modular design treats refrigeration modules as replaceable units that can be quickly swapped out when出现故障, similar to disposable components. This approach prioritizes rapid replacement over complex repair procedures, allowing non-expert personnel to maintain the system by replacing entire modules rather than attempting to repair internal components.
3Reliability
If frequent shore-based servicing is performed, then system reliability is maintained, but loss of time increases
Solution Approach 1:
Multiple pre-configured modular refrigeration units are installed on board as stand-by components. When a module requires maintenance or fails, a replacement module is already available and can be immediately installed, eliminating the need to wait for shore-based servicing and significantly reducing downtime while maintaining system reliability.
Solution Approach 2:
The system enables self-service maintenance where onboard personnel can perform module replacement without requiring specialized tools, training, or shore-based support. The standardized interfaces and simple replacement procedures allow the vessel to service its own refrigeration system independently, eliminating dependency on external servicing and reducing time loss.
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
The modular system simplifies maintenance and operation, allowing ships to maintain refrigeration capabilities during extended offshore periods without the need for frequent shore-based servicing, reducing downtime and operational complexity.
Implementation Method 1
a heat exchanger adapted to be connected to a cooling water network to condense the refrigerant with cooling water
Implementation Method 2
at least one compressor adapted to compress a refrigerant
Data Source
AI summary
A self-enclosed modular refrigeration unit for refrigeration system comprises compressor adapted to compress a refrigerant. A heat exchanger is connected to a cooling water network to condense the refrigerant with cooling water. A suction line is connected to a suction side of the compressor and adapted to provide a feed of refrigerant to the compressor. A discharge line is connected to a discharge side of the compressor and to the heat exchanger to direct compressed refrigerant to the heat exchanger. A head pressure control valve is in the discharge line downstream of the heat exchanger to control an upstream pressure. A casing encloses the compressor, the heat exchanger, the head pressure control valve. An outlet line has an outlet end downstream of the head pressure control valve adapted to output cooling refrigerant having passed through the head pressure control valve. An inlet end is upstream of the suction line to provide a feed of refrigerant to the compressor.