Warm Water Cooling for Data Center Air-to-Water Heat Exchangers
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Solution Overview
Problem
Data centers face high electrical power consumption and cooling costs due to heat generated by thousands of microprocessors, which requires significant energy for both operating the equipment and cooling systems, often relying on energy-intensive chillers and cooling towers.
Innovation Solution
The system employs elevated air and water temperatures to facilitate efficient heat removal using air-to-water heat exchangers and evaporative cooling sources like cooling towers, reducing the need for chiller-based cooling and optimizing the use of free cooling sources, with a control system managing temperature setpoints to maintain efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chiller-based cooling systems are used to remove heat from data centers, then effective cooling is achieved, but electrical power consumption and operating costs increase significantly
Solution Approach 1:
The patent changes the temperature parameters of the cooling system by pre-heating the cooling water before it enters the chiller heat exchanger. This pre-heating is achieved by routing the cooling water through a heat exchanger that recovers heat from the chiller's exhaust air stream. By increasing the inlet water temperature to the chiller, the temperature differential across the chiller evaporator is reduced, which significantly improves chiller efficiency and reduces electrical power consumption while maintaining effective cooling.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor the temperature of the cooling water and the exhaust air stream, and automatically adjust the heat exchange process to optimize cooling efficiency. This ensures that the pre-heating of cooling water is dynamically adjusted based on actual operating conditions, maintaining optimal chiller performance and minimizing energy consumption.
2Use of energy by moving object
If cooling water temperature is increased to improve chiller efficiency, then energy consumption decreases, but the risk of condensation and corrosion increases
Solution Approach 1:
The patent introduces an intermediary substance or barrier between the pre-heated cooling water and the metal components of the cooling system. This intermediary layer prevents direct contact between the warm, potentially corrosive water and the metal surfaces, thereby reducing corrosion risk. Additionally, the intermediary mechanism helps control condensation by managing the thermal and humidity conditions at critical interfaces.
Solution Approach 2:
The system converts the potentially harmful effect of warm, humid cooling water into a benefit by using the heat recovery process. The heat that would otherwise be wasted in the chiller exhaust air stream is captured and used to pre-heat the cooling water, improving overall system efficiency. The harmful warmth is transformed into a useful thermal resource.
3Loss of energy
If heat recovery from chiller exhaust air is implemented, then overall system efficiency improves, but system complexity increases
Solution Approach 1:
The patent merges the heat recovery function with the existing cooling water circulation system by integrating a heat exchanger into the current infrastructure. The heat recovery process is combined with the cooling water pre-heating function, creating a unified system that reduces energy waste without requiring entirely separate systems. This integration approach minimizes the increase in system complexity while achieving significant energy recovery.
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 significantly reduces energy consumption and costs by minimizing the use of energy-intensive cooling components, allowing for efficient operation with less electrical power and lower capital costs, while maintaining effective cooling for electronic equipment.
Implementation Method 1
cooling the heated air by more than fifteen degrees Celsius in an air-to-water heat exchanger
Implementation Method 2
the system may be run under most conditions using only cooling from cooling towers or other free cooling sources
Data Source
AI summary
A system for providing cooled air to electronic equipment includes an evaporative cooling water source; a water-to-water heat exchanger in fluid communication with the evaporative water source; an air-to-water heat exchanger in fluid communication with the water-to-water heat exchanger and positioned to received heated air from a group of electronic devices; and a control system programmed to maintain a supply of cooling water to the air-to-water heat exchanger at a temperature above a dew point of air surrounding the air-to-water heat exchanger.