Variable-Mass Reservoir Control for Two-Phase Cooling Stability
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Solution Overview
Problem
Pumped/thermosyphon two-phase cooling systems lack internal means to control the thermodynamic state, leading to inefficiencies due to dependence on ambient/heat-rejection conditions, and risk over-pressurization or dry-out without additional pumping power.
Innovation Solution
A control unit with a variable-volume reservoir and pressure sensor adjusts the specific volume of the cooling system to maintain desired thermodynamic states, independent of ambient conditions, using mechanisms like pistons or bellows to vary the reservoir's volume or a variable mass mechanism to adjust the cooling medium's mass, ensuring a stable mixture of liquid and vapor phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pumped/thermosyphon two-phase cooling systems are used, then cooling performance is achieved, but the systems lack internal means to control thermodynamic state and depend on ambient/heat-rejection conditions
Solution Approach 1:
The patent applies parameter changes by varying the volume of the reservoir to control the overall specific volume of the cooling system. This allows active control of thermodynamic state parameters (pressure and temperature) independent of ambient conditions. The reservoir volume is adjusted as a key parameter to maintain desired thermodynamic states during system operation.
Solution Approach 2:
The reservoir acts as an intermediary component between the heat source and heat rejection elements. By controlling the reservoir volume, the system can mediate and control the thermodynamic state of the cooling medium, providing a buffer that decouples the system from ambient condition variations and enables independent thermodynamic control.
2Productivity
If additional pumping power is increased, then cooling performance can be improved, but energy efficiency deteriorates
Solution Approach 1:
The patent changes the reservoir volume parameter to control the circulation and thermodynamic state of the cooling medium. This alternative control mechanism replaces the need for increased pumping power, allowing the system to maintain or improve cooling performance through thermodynamic state control rather than increased mechanical energy input.
Solution Approach 2:
The system uses the natural two-phase thermodynamic cycle and volume control to self-regulate cooling performance without requiring additional pumping energy. The controlled specific volume enables the system to self-adjust the circulation and heat transfer characteristics, achieving improved cooling performance through passive thermodynamic control rather than active mechanical pumping.
3Reliability
If the cooling system operates without volume control, then device complexity is reduced, but the system risks over-pressurization or dry-out
Solution Approach 1:
The patent implements feedback control by monitoring the volume of the reservoir and adjusting it to maintain safe operating conditions. This feedback mechanism prevents over-pressurization by controlling the specific volume and prevents dry-out by ensuring adequate liquid inventory in the system. The continuous adjustment of reservoir volume provides active protection against these failure modes.
Solution Approach 2:
The controllable reservoir volume provides a cushioning buffer that prevents extreme conditions before they occur. By maintaining an appropriate volume of cooling medium in the reservoir, the system creates a safety margin that prevents over-pressurization and dry-out conditions from developing, acting as a preventive measure against potential failures.
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 approach enhances energy efficiency by allowing higher heat-rejection temperatures without increasing pumping power, prevents over-pressurization, and maintains reliable cooling performance by actively controlling the system's thermodynamic state.
Implementation Method 1
a pressure sensor for sensing a pressure value of a vapor side of the first reservoir
Implementation Method 2
controlling a variable mass mechanism coupled to the first reservoir to adjust a total mass of the cooling medium in the first reservoir to change an overall specific volume of the cooling system
Implementation Method 3
heat is transferred from a heat generating component by evaporation and condensation of a cooling fluid
Implementation Method 4
heat is transferred from a heat generating component by evaporation and condensation of a cooling fluid
Data Source
AI summary
An apparatus for facilitating cooling of one or more electronic devices in a cooling system, the apparatus includes a first reservoir configured for containing a cooling medium of a cooling system, a variable mass mechanism coupled to the first reservoir, a pressure sensor for sensing a pressure value of a vapor side of the first reservoir, and a controller coupled to the pressure sensor and the variable mass mechanism. The controller is configured to control the variable mass mechanism to adjust a total mass of the cooling medium in the first reservoir in response to the pressure value to change an overall specific volume of the cooling system.