Cooling device and projector
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Solution Overview
Problem
Existing loop heat pipes face challenges in simultaneously reducing thermal resistance and increasing the amount of heat that can be cooled, due to difficulties in forming grooves with optimal depth and pitch for vapor flow channels, which affects the pressure loss and evaporation area of the working fluid.
Innovation Solution
A cooler design incorporating a groove member made of plate-like metal members with bent parts and evaporation promoters, arranged to form deep vapor flow channels with increased surface area, allowing for efficient heat transfer and evaporation of the working fluid, while minimizing thermal resistance and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If grooves are formed with small pitch to increase evaporation area, then the depth of vapor flow channel becomes small, but pressure loss increases and thermal resistance increases
Solution Approach 1:
The evaporator is segmented into multiple independent groove structures arranged in parallel. Each groove has its own vapor flow channel with optimized depth, allowing the system to achieve large total evaporation area while maintaining adequate channel depth in each segment to reduce pressure loss.
2Loss of energy
If grooves are formed with large depth to reduce pressure loss, then pitch becomes large, but evaporation area decreases
Solution Approach 1:
Instead of creating a single deep groove, the system uses multiple shallower grooves arranged in parallel. This segmentation allows the vapor flow channels to maintain adequate depth for reduced pressure loss while the multiplicity of grooves provides large total evaporation area.
Solution Approach 2:
The solution transitions from optimizing a single groove's depth (one dimension) to optimizing the arrangement of multiple grooves in two dimensions (pitch and number). By adding the dimensional aspect of multiple parallel grooves, the system achieves both adequate channel depth and large evaporation area.
3Area of stationary object
If grooves are formed with small pitch to increase evaporation area, then thermal conductivity path decreases, but thermal resistance increases
Solution Approach 1:
The evaporator structure is segmented into multiple grooves with optimized individual dimensions. Each groove maintains adequate depth for thermal conductivity, while the collective arrangement provides large evaporation area without compromising thermal resistance.
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 enables both reduced thermal resistance and increased heat dissipation capacity, improving cooling performance by enhancing the evaporation area and reducing pressure loss, thus overcoming the limitations of traditional loop heat pipes.
Implementation Method 1
a wick disposed in the housing, soaked with the working fluid in the liquid phase, and configured to transport the working fluid in the liquid phase
Implementation Method 2
an evaporator configured to evaporate working fluid in a liquid phase with a heat transferred from a cooling target to change to the working fluid in a gas phase
Implementation Method 3
evaporate working fluid in a liquid phase with a heat transferred from a cooling target
Implementation Method 4
a condenser configured to condense the working fluid in the gas phase to change to the working fluid in the liquid phase
Implementation Method 5
the groove member includes a plurality of plate-like members made of metal, arranged side by side along a predetermined direction, and constituting the plurality of vapor flow channels
Data Source
AI summary
A cooler includes an evaporator and a condenser. The evaporator includes a housing, a wick, and a groove member having a plurality of vapor flow channels through which working fluid changed in phase from a liquid phase to a gas phase flows, the groove member being coupled to the wick. The housing includes a heat receiver to which the heat is transferred from a cooling target. The groove member includes a plurality of plate-like members, arranged side by side along a predetermined direction, and constituting the plurality of vapor flow channels. Each of the plate-like members includes a bent part formed by bending a part of the plate-like member, the bent part being coupled to the heat receiver.