Pre-Dehumidified Multi-Mode Cooling for Data Center Heat Loads
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Solution Overview
Problem
Data centers face inefficiencies in waste heat removal due to non-uniform waste heat generation across racking systems and varying outside air quality, which complicates cooling system sizing and operation.
Innovation Solution
A multi-mode cooling system incorporating a dehumidification system upstream from mechanical and evaporative cooling sections, allowing for adiabatic, hybrid, economizer, free cooling, and mechanical modes based on ambient conditions, with a bypass duct for the adiabatic system to optimize cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a mechanical cooling system is sized for cooler, drier times of year, then it operates efficiently during those periods, but it fails to provide adequate cooling in hot, humid weather
Solution Approach 1:
The cooling system dynamically adjusts its configuration by switching between different cooling paths (mechanical cooling, evaporative cooling, or combination) based on real-time ambient conditions such as temperature and humidity levels. This dynamic adaptability allows the system to maintain both efficiency and adequacy across varying environmental conditions.
Solution Approach 2:
The system changes its operational parameters by adjusting the relative contribution of mechanical cooling versus evaporative cooling based on ambient temperature and humidity measurements. This parameter adjustment enables the system to optimize performance for different weather conditions without requiring oversizing.
2Reliability
If a mechanical cooling system is sized to provide effective cooling during hot, humid summer months, then it provides adequate cooling year-round, but it results in a system that is significantly oversized for cooler, drier times of year
Solution Approach 1:
The cooling system is segmented into two distinct cooling pathways: mechanical cooling and evaporative cooling. This segmentation allows each subsystem to be sized appropriately for specific conditions, with the mechanical cooling handling high-load hot humid conditions and evaporative cooling handling cooler drier conditions, eliminating the need for a single oversized system.
Solution Approach 2:
The cooling system achieves multi-functionality by combining mechanical cooling and evaporative cooling capabilities in a single integrated system. This universal design allows the system to effectively handle a wide range of ambient conditions from hot and humid to cool and dry, replacing the need for separate systems or an oversized single system.
3Power
If outside air is used as a source of cooling air, then cooling capacity is increased, but variations in temperature and humidity and environmental quality create challenges in effectively sizing and operating cooling air systems
Solution Approach 1:
The cooling system incorporates feedback mechanisms that continuously monitor ambient temperature and humidity conditions, then automatically adjust the operating mode and configuration of the cooling system. This feedback control enables the system to adapt to varying outside air conditions while maintaining optimal cooling capacity and efficiency.
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
The system enhances cooling efficiency and reduces energy consumption by adapting to varying ambient conditions, ensuring effective heat removal and humidity control across non-uniform heat generation sources.
Implementation Method 1
A multi-mode cooling system incorporating a dehumidification system upstream from mechanical and evaporative cooling sections
Implementation Method 2
an evaporative cooling section downstream from the mechanical cooling section
Implementation Method 3
a mechanical cooling section that removes heat from the cooling air
Data Source
AI summary
A system for cooling computer systems in a room of a data center includes a dehumidification system and an air channeling sub-system. The air channeling sub-system includes a mechanical cooling section that removes heat from the cooling air and an evaporative cooling section downstream from the mechanical cooling section. The dehumidification system may be upstream from the mechanical cooling section and the evaporative cooling section. A controller for the cooling system selectively operates the mechanical cooling section and the evaporative cooling section in an adiabatic mode if a first set of control conditions is met and in a hybrid mode if a second set of control conditions is met.