Rack Heat Exchanger Layout for Uniform Cooling of Vertical Boards
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Solution Overview
Problem
Existing cooling systems for vertically stacked electronic equipment in racks or cabinets inadequately cool higher boards due to warmer air circulation, leading to overheating and reduced performance, as they struggle with increased heat loads from more powerful microprocessors.
Innovation Solution
A cooling system with an enclosure and fans that incorporates heat exchangers in a spaced-apart relationship with heat-generating objects, either at the inlet, outlet, or both, to pre-cool or post-cool air streams, using micro-channel refrigerant heat exchangers to efficiently transfer heat away from the equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air is drawn into the bottom of the rack and moved vertically through the cabinet to cool computer boards, then the bottom boards are cooled effectively, but the higher boards receive warmer air and are not adequately cooled
Solution Approach 1:
The cooling system is divided into multiple independent cooling zones, with separate heat exchangers positioned at different vertical levels within the rack. Each heat exchanger handles cooling for its specific zone, preventing warm air from lower zones from affecting upper zones. This segmentation allows each board to receive optimally cooled air independent of its vertical position.
Solution Approach 2:
Heat exchangers are introduced as intermediary components between the air source and the computer boards. These heat exchangers pre-cool the air before it reaches the boards, ensuring that even higher boards receive adequately cooled air. The heat exchangers act as mediators that decouple the vertical air flow path from the cooling effectiveness.
2Power
If newer, more powerful microprocessors are used to increase performance, then processing capability is improved, but heat generation increases significantly beyond what unaided air cooling can handle
Solution Approach 1:
The system employs liquid-based heat exchangers (hydraulic principle) to transfer heat from the air stream. The heat exchangers use liquid coolant circulation to absorb and remove heat that would otherwise be unmanageable with air cooling alone. This allows high-power processors to be cooled effectively by converting part of the cooling mechanism from pneumatic (air) to hydraulic (liquid coolant).
Solution Approach 2:
The cooling system changes the thermal parameters of the air stream by introducing heat exchangers that actively remove heat. This transforms the cooling approach from passive convection to active thermal management, enabling the system to handle the increased heat loads from high-power processors while maintaining adequate cooling temperatures.
3Loss of energy
If existing cooling systems with heat densities of 80-150 W/ft2 are used, then some cooling capacity is provided, but state-of-the-art electronic equipment still overheats
Solution Approach 1:
The system transitions from two-dimensional heat dissipation (horizontal heat exchanger surfaces) to three-dimensional heat exchange by positioning heat exchangers at multiple vertical levels throughout the rack. This vertical dimensionality allows the system to handle increased heat densities by distributing cooling capacity throughout the vertical space, enabling effective cooling of state-of-the-art equipment with higher power densities.
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 solution ensures effective cooling of vertically stacked electronic components by maintaining lower temperatures and reducing the heat load on room air conditioning, thereby enhancing system performance and reducing cooling costs.
Implementation Method 1
the heat exchanger removes the heat before the air exits the enclosure
Implementation Method 2
a fan induces air flow into the air inlet, through the enclosure and out the air outlet
Data Source
AI summary
A system for cooling heat-generating objects, such as computer boards situated in a rack, includes an enclosure in which the heat generating objects are situated. The enclosure has an air inlet and an air outlet, and a fan induces airflow into the air inlet, through the enclosure and out the air outlet. A heat exchanger is situated in the enclosure such that the heat exchanger is in a spaced apart relationship with the heat-generating object. Air moving through or past the heat-generating object is warmed, and the heat exchanger removes the heat before the air exits the enclosure.