Crossflow Heat Exchanger With Zoned Airflow to Prevent Condensation
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Solution Overview
Problem
Large-scale electronic displays face condensation issues due to temperature and humidity fluctuations, which can lead to electronics failure, and existing heat-exchangers contribute to these problems by creating hot and cold spots, affecting heat transfer efficiency.
Innovation Solution
A crossflow heat-exchanger with controlled fluid flow rates and temperature management systems, including a power controller, temperature and humidity sensors, and a dehumidifier, to regulate dew points and prevent condensation, while optimizing heat transfer by varying fan speeds and airflow across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat-exchanger is used to cool the display, then overheating is prevented, but condensation forms on cold spots
Solution Approach 1:
The heat exchanger is divided into multiple channels (first set and second set of channels) that cross each other. Each channel can independently control fluid flow rates, allowing segmentation of the thermal management function to eliminate localized cold spots that cause condensation.
Solution Approach 2:
The system dynamically adjusts fluid flow rates through different channels based on real-time temperature conditions. Controllers modify flow rates to maintain relatively uniform temperatures across the heat exchanger surface, preventing condensation formation while achieving cooling.
2Device complexity
If uniform fluid flow rates are used through all channels, then system simplicity is maintained, but temperature distribution becomes non-uniform creating cold spots
Solution Approach 1:
Each channel is equipped with independent flow rate control, allowing local adjustment of fluid flow based on specific thermal conditions in different regions of the heat exchanger. This ensures relatively uniform temperature distribution across the entire heat exchanger surface.
Solution Approach 2:
The system changes the flow rate parameter for each channel independently based on temperature measurements. By adjusting flow rates as a variable parameter, the system achieves uniform temperature distribution while managing complexity through controller coordination.
3Power
If high cooling capacity is provided, then overheating is prevented, but condensation risk increases due to excessive cooling
Solution Approach 1:
Temperature sensors provide feedback on the thermal state of the display and heat exchanger. Controllers use this feedback to dynamically adjust fluid flow rates, providing high cooling capacity when needed while reducing flow rates in regions where excessive cooling would cause condensation.
Solution Approach 2:
The heat exchanger system self-regulates by distributing cooling capacity across multiple independently controlled channels. Each channel adjusts its own flow rate based on local temperature conditions, providing high overall cooling capacity while preventing localized over-cooling and condensation.
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 manages condensation risks and enhances heat transfer efficiency, ensuring reliable operation of large-scale electronic displays by maintaining optimal temperature and humidity conditions, reducing the likelihood of electronics failure and improving overall performance.
Implementation Method 1
first and second sets of fluid-flow channels arranged such that each set crosses the other to afford heat-exchange between a first fluid in the first set and a second fluid in the second set
Implementation Method 2
a first impelling means arranged to cause flow of the first fluid through the first set of channels; a second impelling means arranged to cause flow of the second fluid through the second set of channels
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A crossflow heat-exchanger (100) has first and second sets of fluid-flow channels (103, 104) arranged such that each set crosses the other to afford heat- exchange between cooling air in the first set (103) (seen as rows) and hot air in the second set (104) (seen as columns), without the cooling air and the hot air contacting one another. A first series of fans (101) causes flow of the external cooling air through the rows (103). A second series of fans (102) causes flow of the internal hot air through the columns (104). External and internal fan controllers (124, 125) control the speed of each fan (101, 102) independently such that external cooling air flows through different rows (103) at different rates and internal hot air flows through different columns (104) at different rates.