Forced-Flow Barge Cooling for Stationary Heat Exchanger Performance
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Solution Overview
Problem
Closed-loop cooling systems on refrigerated barges are inefficient when stationary, as they rely solely on conduction for heat transfer, limiting cargo loading and increasing operational costs due to the need for refrigeration equipment and scheduling challenges.
Innovation Solution
An open-loop cooling system is integrated with the closed-loop system, utilizing a pump and piping network to enhance heat transfer by increasing water flow velocity across the heat exchanger, including a constriction segment and valve control to optimize flow based on barge speed and temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the barge is stationary or moving slowly, then the closed-loop cooling system relies solely on conduction for heat transfer, but the heat removal rate becomes insufficient
Solution Approach 1:
The patent introduces an open-loop cooling system that uses hydraulic principles to force water flow through the heat exchanger. A pump draws water from the ambient environment and forces it through piping into the heat exchanger, creating forced convection current that dramatically improves heat transfer efficiency when the barge is stationary or moving slowly.
Solution Approach 2:
The system changes the flow regime parameter from natural conduction/diffusion to forced convection by introducing a pump-driven water flow. This parameter change transforms the heat transfer mechanism, allowing effective cooling regardless of the barge's motion state.
2Temperature
If coolers are mounted directly to the outside of the hull, then the installation is simple, but only the outer side of the cooler is in contact with water flow, reducing cooling efficiency
Solution Approach 1:
The patent transitions from a single-sided external cooler configuration to a dual-sided internal configuration. The heat exchanger is positioned inside the hull with water flow accessible on both sides - the pump forces water through the heat exchanger, allowing heat transfer from both the inner and outer surfaces, effectively doubling the heat transfer area.
Solution Approach 2:
The patent introduces an intermediary water flow system that mediates between the ambient water and the heat exchanger. Instead of relying solely on external water flow, a controlled water flow is introduced as an intermediary medium to enhance heat transfer from both sides of the heat exchanger.
3Productivity
If the cooling system operates at maximum capacity, then the heat transfer is optimized, but the temperature differential dependency limits flexibility
Solution Approach 1:
The patent introduces dynamic control capabilities through a variable speed pump and control system that can adjust water flow rate based on operational conditions. This allows the cooling system to adapt to varying heat loads and ambient temperatures, optimizing performance across different operating scenarios rather than being fixed at maximum capacity.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor temperature differential and adjust the water flow rate accordingly. This feedback loop allows the system to maintain optimal cooling efficiency while adapting to changing conditions, reducing the rigid dependency on temperature differential for performance.
4Productivity
If the barge is docked for loading, then cargo can be loaded, but the cooling system is least effective and loading may need to be suspended
Solution Approach 1:
The open-loop cooling system can be activated before cargo loading begins to pre-cool the barge interior and cargo holds. This preliminary cooling action ensures the cooling system is already at full effectiveness when loading starts, preventing interruptions and maintaining both loading productivity and temperature control.
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 configuration significantly enhances heat removal from the barge, particularly when stationary, by increasing the surface area exposed to water flow, thereby improving cooling efficiency and reducing operational costs and scheduling delays.
Implementation Method 1
The present disclosure relates to a forced flow water circulating system for cooling a water-going vessel
Implementation Method 2
One or more suitable heat exchangers, such as box coolers, cooling fins, or grid coolers, may be disposed on or in the outer hull
Implementation Method 3
The heat exchanger is cooled by conduction (when the barge is motionless or only slightly moving relative to the water)
Implementation Method 4
The heat exchanger is cooled by conduction (when the barge is motionless or only slightly moving relative to the water) or by convection and conduction (when the barge is moving relative to the water)
Data Source
AI summary
The disclosure relates to an open-loop cooling system installed on a refrigerated barge for removing heat from an external heat exchanger in communication with a closed-loop internal cooling system. The system includes an open loop with a pump drawing water from the environment and forcing the water across the outer surface of the heat exchanger to augment existing heat removal due to contact with and flow of water across the heat exchanger due to the motion of the barge. Water is forced across the side faces and inner faces of the cooler to increase heat transfer from the barge closed-loop cooling system to the water environment.