Variable air cooling system for data centers
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Solution Overview
Problem
Existing cooling systems for high-density data centers face inefficiencies due to the inability to provide direct free cooling and compatibility issues with low-density areas, along with complex control requirements for outside air temperature, humidity, and air mixing.
Innovation Solution
A variable air cooling system that includes controlled inputs for outside and recycled air, a selectively activatable cooling mechanism, and a control system monitoring outside and blowing air temperatures to maintain a predefined temperature range and optimize hygrometry, using a heat exchanger with a secondary water circuit and humidifier for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If free cooling systems are used for low density data centers, then energy efficiency is improved, but control complexity increases due to multiple interfering control loops for temperature and humidity
Solution Approach 1:
The system changes the operating parameters of the CRAC unit dynamically based on outside air conditions. When outside air temperature is favorable, the system increases free cooling air intake and reduces CRAC operation, thereby improving energy efficiency while maintaining acceptable temperature and humidity levels through parameter adjustment rather than complex control loops
Solution Approach 2:
The system implements feedback control by continuously monitoring inside air temperature, humidity, and outside air conditions, then adjusting the CRAC operation and air mixing ratios accordingly. This feedback mechanism simplifies control by using sensor data to automatically balance free cooling and mechanical cooling, reducing the need for multiple interfering control loops
2Temperature
If cooling doors or containers are used in high density data centers, then cooling capacity is improved, but energy efficiency deteriorates due to inability to provide direct free cooling
Solution Approach 1:
The system makes the cooling system universal by designing it to handle both high density and low density configurations. The same infrastructure can operate in free cooling mode when outside conditions permit, or switch to full CRAC operation when higher cooling capacity is needed, eliminating the need for separate cooling solutions for different density scenarios
Solution Approach 2:
The system dynamically adjusts its operation mode based on real-time conditions. The CRAC unit and free cooling system work in a dynamic balance, with the system continuously optimizing the mix of outside air and recirculated air to meet cooling demands while maximizing energy efficiency, rather than being locked into a fixed high-capacity mode
3Temperature
If CRAC is used to cool the whole room, then cooling capacity is improved, but adaptability deteriorates due to incompatibility with existing low density areas
Solution Approach 1:
The system segments the cooling approach by allowing different zones or configurations to operate independently. Existing low density areas can continue operating with free cooling while new high density areas utilize CRAC support, enabling gradual integration and reconfiguration without requiring complete infrastructure changes across the entire facility
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 provides direct free cooling with improved energy efficiency for both high-density and low-density environments, allowing for reconfiguration without infrastructure investment and maintaining optimal temperature and humidity levels.
Implementation Method 1
The cooling mechanism may include a secondary water circuit with a valve to adapt the water temperature of the heat exchanger
Implementation Method 2
The cooling system may include a humidifier for selectively controlling the hygrometry of the air in the cooling system
Data Source
AI summary
A method and system for cooling air within an enclosure. The enclosure includes a cooling system and a remaining portion of the enclosure that is external to the cooling system. An outside air temperature of air entering the cooling system from outside the enclosure is monitored. A blowing air temperature of air in the cooling system at the outlet of the cooling system is monitored. A first inlet of the enclosure is controlled to be fully open or fully closed, in dependence on the monitored outside air temperature. A second inlet of the enclosure is controlled by adjusting an amount of opening of the second inlet, in dependence on the monitored blowing air temperature. A valve in a secondary water circuit of the cooling mechanism is controlled by adjusting an amount of opening of the valve, in dependence on the monitored outside air temperature.