Modular Backup Cooling Loop for Data Center Power Outages
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Solution Overview
Problem
Data centers face challenges in maintaining cooling during power outages, as components like CRAC fans and chillers are not typically connected to UPS, leading to rapid temperature rises and potential server shutdowns.
Innovation Solution
A modular backup cooling system with a closed fluid circuit, including a condenser, compressor, heat exchanger, and holding tanks, that stores refrigerant for immediate cooling during power outages, using a solenoid valve to switch between normal and backup modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cooling system components (CRAC fans, chillers) are not connected to UPS, then power consumption is reduced during normal operation, but cooling capability is lost during power outages
Solution Approach 1:
The system pre-charges capacitors during normal operation when power is available. These capacitors store electrical energy that can be immediately discharged to power cooling components during a power outage, enabling the fans and chillers to continue operating without being permanently connected to UPS.
Solution Approach 2:
The system uses its own operational power to pre-charge the capacitors during normal operation, creating a self-sustaining backup mechanism. The cooling system serves itself by using a portion of its normal operational energy to prepare backup power, eliminating the need for external UPS infrastructure.
2Reliability
If backup cooling system is added, then cooling reliability during power outages is improved, but system complexity increases
Solution Approach 1:
The backup cooling system integrates the capacitor bank directly into the existing cooling system architecture, combining the power storage function with the cooling components. The solenoid valve integrates both normal cooling and backup cooling fluid paths into a single unified system, reducing overall complexity compared to separate independent systems.
Solution Approach 2:
The capacitor bank serves dual purposes: it can be charged during normal operation and discharged during power outages. The solenoid valve provides universal control for both normal cooling mode and backup cooling mode, managing fluid flow through the heat exchanger in both operational states, thereby reducing the need for separate dedicated components.
3Reliability
If solenoid valve is used to switch between normal and backup modes, then cooling continuity is improved, but device complexity increases
Solution Approach 1:
The system extracts and isolates the control function into a dedicated solenoid valve that handles only the switching between normal and backup modes. This separates the complex control logic from the main cooling system, simplifying the overall control architecture while maintaining cooling continuity through automated valve actuation based on power status detection.
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
Ensures continuous cooling by providing on-demand backup cooling, preventing overheating and downtime by maintaining low water temperatures for liquid-cooled chips during power failures.
Implementation Method 1
a heat exchanger positioned downstream of the high-pressure holding tank, the heat exchanger selectively receiving the refrigerant from the high-pressure holding tank, the heat exchanger is in thermal communication with the technical fluid
Implementation Method 2
a solenoid valve positioned upstream of the heat exchanger and downstream of the high-pressure holding tank, the solenoid valve selectively fluidly connects the high-pressure holding tank and the heat exchanger
Implementation Method 3
a condenser
Implementation Method 4
a compressor communicating with the condenser on the closed fluid circuit
Data Source
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AI summary
A cooling system comprises a first closed fluid loop, a second closed fluid loop, a backup cooling storage system, and a controller. The first closed fluid loop is configured to circulate a first refrigerant and comprises a compressor, a condenser, and a first heat exchanger. The second closed fluid loop circulates a technical fluid. The technical fluid of the second closed loop is in thermal communication with the first heat exchanger. The backup cooling storage system is configured to circulate a second refrigerant selectively. The backup cooling storage system comprises a second heat exchanger, a high-pressure holding tank upstream from the second heat exchanger, a valve downstream of the high-pressure holding tank, and a low-pressure holding tank downstream from the second heat exchanger. The controller is a low-pressure holding tank and is configured to open or close the valve based on detecting a power outage in the cooling system.