Thermosiphon Data Center Cooling Eliminates Mechanical Pumps
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Solution Overview
Problem
Existing cooling systems for electronic equipment in data centers often face inefficiencies and high costs due to inadequate heat removal, leading to potential device failure and increased power consumption, especially in areas with difficult cooling access.
Innovation Solution
A thermosiphon system is implemented, utilizing multiple evaporator modules in thermal contact with heat-generating devices, where a working fluid changes phases to circulate heat without mechanical pumps, with a condenser module mounted externally to efficiently expel heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If forced convection cooling is used with fans and ductwork, then cooling airflow can be provided over electronic devices, but power consumption increases and devices in difficult-to-cool areas may still overheat
Solution Approach 1:
The patent replaces mechanical fans and pumps with a thermosiphon system that uses natural convection and phase change of working fluid. The fluid circulates through evaporator modules in thermal contact with electronic devices, absorbing heat and transporting it to condenser modules without mechanical propulsion, thereby eliminating the power consumption associated with forced convection cooling equipment.
Solution Approach 2:
The thermosiphon system utilizes phase transitions of the working fluid (evaporation at evaporator modules, condensation at condenser modules) to transfer heat. The fluid absorbs latent heat during evaporation from hot electronic components and releases latent heat during condensation at the condenser, providing efficient cooling without requiring mechanical energy input.
2Reliability
If multiple evaporator modules are added to cool all devices, then cooling coverage improves, but system complexity and floor space increase
Solution Approach 1:
The cooling system is divided into multiple modular evaporator units, each equipped with its own thermosiphon loop containing working fluid. Each evaporator module can independently cool specific electronic devices or components, allowing selective cooling of high-heat-generating areas without requiring a complex centralized system to cover the entire rack.
Solution Approach 2:
The thermosiphon working fluid serves multiple functions: it acts as a heat transfer medium in evaporator modules, a transport medium through connecting conduits, and a condensing medium in condenser modules. This multi-functional approach reduces the number of separate cooling systems needed, simplifying overall system complexity while maintaining comprehensive cooling coverage.
3Use of energy by moving object
If thermosiphon system is used to reduce power consumption, then energy efficiency improves, but heat expulsion effectiveness may be reduced
Solution Approach 1:
The condenser modules utilize phase change (condensation) of the working fluid to efficiently reject heat. When the vapor-phase working fluid enters the condenser, it condenses back to liquid phase, releasing latent heat to the surrounding environment or cooling medium. This phase transition process provides high heat expulsion effectiveness without requiring mechanical compression, maintaining energy efficiency while ensuring adequate heat rejection.
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 system reduces cooling system power requirements, maintains tight temperature ranges, requires less maintenance, and minimizes floor space, while providing efficient heat expulsion and reliability compared to other cooling methods.
Implementation Method 1
A liquid phase of a working fluid is circulated through the evaporator modules, into which heat from the heat-generating devices is transferred. As the heat is transferred to the working fluid, the liquid phase changes to a vapor phase or a mixed vapor-liquid phase
Implementation Method 2
solid surface components of the evaporator modules and heat-generating devices, respectively, may be placed into physical contact (through a thermal interface material or otherwise) to create a thermal interface through which heat flows from the heat-generating devices to the working fluid
Implementation Method 3
The vapor, or mixed, phase circulates to a condenser module of the thermosiphon system, where it is changed back to the liquid phase by a cooling fluid that is circulated through the condenser module
Implementation Method 4
the liquid form of the fluid is then returned via gravity to the evaporator
Data Source
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AI summary
A server rack thermosiphon system (500) includes a plurality of evaporators (550), each evaporator including a thermal interface for one or more heat-generating server rack devices (521); at least one condenser (515) mounted internal to a server rack (505), the condenser including a fluid-cooled heat transfer module; a liquid conduit that fluidly couples each of the evaporators to the condenser to deliver a liquid phase (507) of a working fluid from the condenser to the evaporators; and a vapor conduit that fluidly couples each of the evaporators to the condenser to deliver a mixed phase (503) of the working fluid from the evaporators to the condenser.