Heat Exchanger Screen and Condensate Vent for Freezing Prevention
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Solution Overview
Problem
Conventional gas-cooled heat exchangers, such as intercoolers, face issues with condensate formation and freezing due to high relative air humidity and ambient temperatures, leading to performance degradation or complete blocking, and existing solutions like adjustable screens, dams, and permanent openings either reduce cooling performance or incur additional costs and complexity.
Innovation Solution
A gas-cooled heat exchanger with a screen arranged in front of the heat transfer block to reduce airflow around specific flow channels, combined with a vent in one of the collection chambers that can be opened or closed to discharge condensate, utilizing gravity and pressure differences to prevent condensate return and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling performance of the heat exchanger is increased to improve the cooling capacity, then the exit temperature of the air flow is reduced, but condensate formation and freezing occurs under certain operating conditions
Solution Approach 1:
The heat exchanger is divided into multiple flow channels (first and second flow channels) that are independently controllable. By segmenting the flow channels, the system can selectively reduce cooling in specific channels where condensate formation is problematic, while maintaining high cooling performance in other channels. This resolves the contradiction by allowing localized temperature control to prevent freezing in specific areas without sacrificing overall cooling capacity.
Solution Approach 2:
The system incorporates adjustable screens that can dynamically modify the flow area of air passage openings in response to operating conditions. This dynamic adjustment allows the heat exchanger to adapt its cooling performance in real-time, reducing cooling in specific channels when condensate formation is detected or anticipated, while maintaining high cooling performance in other channels. This resolves the contradiction by making the cooling performance controllable and adaptive to prevent freezing.
2Object-affected harmful factors
If adjustable screens or dampers are installed to reduce air flow and prevent condensate formation, then the cooling performance is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The adjustable screens are positioned to cover only specific air passage openings in certain flow channels, not the entire heat exchanger. This local application allows condensate prevention in specific areas where it occurs most frequently, while maintaining full cooling performance in other areas. This resolves the contradiction by applying the complexity-only where necessary to prevent condensate, rather than throughout the entire system.
Solution Approach 2:
The system modifies the flow area parameter of specific air passage openings using adjustable screens, changing the local airflow characteristics to prevent condensate formation. By adjusting this single parameter in specific locations rather than redesigning the entire system, the solution achieves condensate prevention with minimal increase in device complexity.
3Object-affected harmful factors
If a permanent opening is provided for continuous condensate discharge, then condensate can be drained, but water can enter through the opening when the engine is at a standstill
Solution Approach 1:
The draining device incorporates a controllable opening that can dynamically open to discharge condensate and close to prevent water ingress. This dynamic control allows the system to respond to operating conditions, opening the drain when condensate accumulation is detected and closing it when the engine is at a standstill or when water ingress risk is present. This resolves the contradiction by making the opening controllable rather than permanent.
Solution Approach 2:
The system includes sensors that detect condensate levels and provide feedback to control the opening/closing of the draining device. When condensate accumulates to a certain level, the sensor triggers the opening to discharge it. When the engine is at a standstill or when no condensate is present, the opening remains closed. This feedback mechanism resolves the contradiction by using real-time information to control the drain opening, preventing water ingress while enabling condensate discharge when needed.
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 solution effectively reduces condensate formation and freezing in covered flow channels while maintaining sufficient cooling performance, ensuring functional reliability even at low temperatures, and prevents contamination by ensuring condensate discharge without compromising the heat exchanger's operation.
Implementation Method 1
a screen (4) arranged in front of the heat transfer block (2) in the flow direction to prevent air flow around the flow channels (9) of the heat transfer block (2) which are covered by the screen (4)
Implementation Method 2
one of the collection chambers (3) has a vent (12) for releasing the condensate of the fluid which can be closed or opened towards the surrounding area of the heat exchanger
Implementation Method 3
heat transfer block (2) featuring a plurality of flow channels (9), with a first collection chamber (3) and with a second collection chamber (3), wherein the collection chambers (3) are fluidically connected with one another via the flow channels (9) and gas can flow on the outside through the heat transfer block (2)
Data Source
AI summary
A gas-cooled heat exchanger, in particular a direct intercooler, for cooling of a fluid which flows through the heat exchanger, with a heat transfer block featuring a plurality of flow channels, with a first collection chamber and a second collection chamber. The collection chambers are fluidically connected with one another via the flow channels and the outside of the heat transfer block can be perfused by gas. In the direction of the perfusion, a screen is arranged in front of the heat transfer block for the prevention of flow in certain areas around the flow channels of the screen. One of the collection chambers features a vent for discharge of condensate of the fluid which can be sealed from or released into the surrounding area of the heat exchanger.