Methods and apparatus for an autonomous stage-switching multi-stage cooling device
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Solution Overview
Problem
Existing coolant distribution units (CDUs) lack temperature control capability and can have faulty heat exchangers, leading to thermal inefficiencies and computational downtime.
Innovation Solution
An autonomous stage-switching multi-stage cooling device that intelligently controls fluid cooling stages using valves and temperature thresholds to achieve precise temperature control and energy-efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standard commercial off-the-shelf CDU solutions are used, then device complexity is reduced, but temperature control capability is lost and thermal efficiency deteriorates
Solution Approach 1:
The CDU is divided into multiple independent cooling stages (first cooling stage, second cooling stage, third cooling stage), each with its own heat exchanger and controllable valve. This segmentation enables precise temperature control at each stage while maintaining overall system functionality, resolving the contradiction between simplified structure and temperature control capability.
Solution Approach 2:
The patent implements dynamic stage switching based on real-time temperature monitoring. The controller activates or deactivates specific cooling stages according to the current temperature of the computing system, enabling adaptive temperature control that responds to changing thermal conditions while maintaining system simplicity.
2Measurement precision
If multi-stage cooling is implemented, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The system employs self-regulating control where temperature sensors continuously monitor the computing system temperature and automatically trigger appropriate cooling stages through the controller. This self-service mechanism achieves precise temperature control without requiring complex manual intervention or overly complicated control architecture.
Solution Approach 2:
The patent implements feedback control through temperature sensors that continuously monitor system temperature and provide information to the controller. The controller uses this feedback to dynamically adjust which cooling stages are active, achieving precise temperature control while keeping the control logic relatively simple through rule-based stage selection.
3Temperature
If continuous cooling is applied, then temperature control is maintained, but energy consumption increases
Solution Approach 1:
The system uses periodic temperature monitoring and stage-based cooling activation rather than continuous full-power cooling. The controller periodically checks temperature conditions and activates only the necessary cooling stages, achieving effective temperature control while significantly reducing energy consumption compared to continuous cooling operation.
Solution Approach 2:
The patent applies partial cooling action by activating only the specific cooling stage needed for the current temperature condition. Instead of always running all cooling stages at full capacity, the system applies just enough cooling (partial action) to maintain target temperatures, thereby reducing overall energy consumption while maintaining effective temperature control.
4Device complexity
If heat exchanger faults are not detected, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The system implements feedback through temperature sensors that continuously monitor the thermal performance of each heat exchanger. By comparing expected versus actual temperature differentials across heat exchangers, the controller can detect faults or degraded performance, improving reliability without requiring complex dedicated detection hardware for each component.
Solution Approach 2:
The controller acts as an intermediary that uses temperature sensor data to indirectly detect heat exchanger faults. Rather than installing direct sensors on each heat exchanger, the system uses temperature measurements from the fluid path as an intermediary indicator of heat exchanger health, maintaining simplicity while improving reliability monitoring.
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
Enables precise control of computing system cooling, avoiding excessive cooling and reducing power usage, thereby enhancing thermal efficiency and minimizing downtime.
Implementation Method 1
a first heat exchanger of a plurality of heat exchangers arranged in a parallel cascading configuration
Implementation Method 2
a first sub-ambient cooler including a first cooling block, a first Peltier cooler, and a first TEC cooler
Data Source
AI summary
Methods and apparatus for an autonomous stage-switching multi-stage cooling device are disclosed are disclosed. A disclosed example coolant distribution unit (CDU) includes an enclosure, an inlet and an outlet of the CDU to be fluidly coupled to a cooling block associated with a heat generating source, at least one sensor to measure a first temperature corresponding to the inlet and a second temperature corresponding to the outlet, and a plurality of valves to be controlled by a controller to control a flow of fluid from the inlet to at least one of an ambient cooler or a sub-ambient cooler based on: (i) a comparison of the first temperature to an ambient temperature and (ii) a comparison of the second temperature to a target temperature.