Variable-Volume Reservoir Control for Two-Phase Cooling Pressure Stability
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Solution Overview
Problem
Pumped and 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 pressure-temperature control unit with a variable volume mechanism and controller adjusts the specific volume of the cooling system to maintain desired thermodynamic states, independent of ambient conditions, using a pressure sensor and variable volume reservoir to manage system pressure and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling system operates without a variable volume mechanism, then the system structure is simple, but the system cannot control thermodynamic state and risks over-pressurization
Solution Approach 1:
The reservoir volume is made variable through a movable piston that can dynamically adjust the vapor space volume based on operating conditions. This dynamic adjustment allows the system to maintain proper thermodynamic state and prevent over-pressurization while adapting to different heat rejection temperatures and ambient conditions.
Solution Approach 2:
The system changes the physical parameter of reservoir volume to control the thermodynamic state. By adjusting the vapor space volume, the system alters pressure and temperature relationships, enabling control over the cooling medium's phase equilibrium and preventing harmful pressure buildup.
2Productivity
If the system depends on ambient heat-rejection conditions, then no additional control mechanisms are needed, but cooling efficiency decreases and energy consumption increases
Solution Approach 1:
The system changes the physical parameter of reservoir volume to control the thermodynamic state. By adjusting the vapor space volume, the system alters pressure and temperature relationships, enabling control over the cooling medium's phase equilibrium and preventing harmful pressure buildup.
Solution Approach 2:
The controller receives feedback about system conditions and automatically adjusts the piston position to maintain optimal thermodynamic state. This closed-loop control ensures the system adapts to changing ambient conditions and heat rejection temperatures, maintaining high cooling efficiency without excessive energy consumption.
3Adaptability or versatility
If the reservoir volume is fixed, then the system structure is simple, but the system cannot adapt to varying heat rejection conditions
Solution Approach 1:
The reservoir volume is made variable through a movable piston that can dynamically adjust the vapor space volume based on operating conditions. This dynamic adjustment allows the system to maintain proper thermodynamic state and prevent over-pressurization while adapting to different heat rejection temperatures and ambient conditions.
Solution Approach 2:
The variable volume reservoir serves multiple functions: it acts as a separator, a pressure control device, and an adaptive thermodynamic state controller. The same structure that separates vapor and liquid also dynamically adjusts volume to adapt to varying heat rejection conditions, eliminating the need for separate control devices.
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
Enhances energy efficiency by allowing higher heat-rejection temperatures without increasing pumping power, prevents over-pressurization, and ensures reliable operation by maintaining a vapor-liquid mixture, thus improving cooling system performance.
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-volume mechanism coupled to the first reservoir to adjust a total volume of the first reservoir in response to the pressure value to change an overall specific volume of the cooling system
Implementation Method 3
two-phase cooling systems
Implementation Method 4
improve cooling and energy efficiency in two-phase cooling systems
Implementation Method 5
a condenser; an evaporator coupled to the condenser
Implementation Method 6
a pump coupled to the evaporator
Data Source
AI summary
An apparatus for facilitating cooling of one or more electronic devices in a cooling system includes a first reservoir configured for containing a cooling medium of a cooling system, a variable volume 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 volume mechanism. The controller is configured to control the variable volume mechanism to adjust a total volume of the first reservoir in response to the pressure value to change an overall specific volume of the cooling system.