Liquid Nitrogen Fire Suppression and Cooling for IT Equipment Spaces
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Solution Overview
Problem
Conventional gas-based fire suppression systems in IT equipment spaces, such as data centers, require separate refrigeration systems for cooling, which increase capital and maintenance costs, and cannot operate concurrently with ventilation systems due to air dilution issues, posing a risk of overheating during fires.
Innovation Solution
A combined cooling and fire suppression system using liquid nitrogen, which evaporates to cool and deplete oxygen, allowing for temperature control and fire suppression without the need for a separate refrigeration system, by integrating a store of liquid nitrogen with a supply mechanism and controller to manage its release in the ventilation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas-based fire suppression system is integrated with a ventilation system, then fire suppression capability is provided, but the ventilation system cannot operate concurrently due to air dilution of the fire-suppressing gas
Solution Approach 1:
The system changes the physical state of the fire-suppressing gas from gaseous to liquid form. Liquid nitrogen is stored and supplied to the system space, where it evaporates to provide fire suppression. This parameter change allows the system to avoid the dilution problem of gaseous systems while maintaining effectiveness.
Solution Approach 2:
The invention extracts the cooling function from a separate refrigeration system and integrates it with the fire suppression system. The evaporation of liquid nitrogen provides both fire suppression and cooling, eliminating the need for a dedicated refrigeration unit and allowing concurrent ventilation operation.
2Temperature
If a separate refrigeration-based cooling system is installed to provide cooling during fire suppression, then cooling capability is maintained, but capital cost and system complexity significantly increase
Solution Approach 1:
The liquid nitrogen system performs multiple functions: fire suppression through oxygen displacement and cooling through evaporation. This multi-functionality eliminates the need for separate refrigeration equipment, reducing system complexity and capital costs while maintaining both cooling and fire suppression capabilities.
Solution Approach 2:
The invention merges the fire suppression function and cooling function into a single integrated system. The same liquid nitrogen supply system provides both functions, consolidating what would traditionally be separate systems into one unified solution.
3Reliability
If the ventilation air inlet is closed to prevent dilution of fire-suppressing gas, then fire suppression effectiveness is maintained, but unaffected IT equipment may overheat
Solution Approach 1:
The ventilation system continues to operate during fire suppression because liquid nitrogen is supplied in a form that does not get diluted by incoming air. The liquid nitrogen evaporates within the system space, providing continuous fire suppression and cooling while the ventilation system maintains normal air flow and cooling of unaffected equipment.
4Speed
If liquid nitrogen is supplied at high rate for rapid fire suppression, then fire suppression speed is improved, but the cooling effect may reduce the air temperature below acceptable levels for IT equipment
Solution Approach 1:
The system dynamically adjusts the liquid nitrogen supply rate based on real-time temperature monitoring. The controller receives temperature signals and modulates the supply rate accordingly, allowing rapid fire suppression when needed while preventing excessive cooling that would compromise IT equipment operation.
Solution Approach 2:
The system incorporates temperature sensing and feedback control. Temperature signals from the system space are fed back to the controller, which adjusts the liquid nitrogen supply rate to maintain temperature within acceptable ranges while achieving effective fire suppression.
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 solution provides effective cooling and fire suppression while maintaining operational temperatures, reducing costs and complexity, and enabling continuous operation of unaffected IT equipment during fires, with the ability to store sufficient nitrogen for multiple fire sequences.
Implementation Method 1
supply means for supplying the fire-suppressing gas in liquid form to the system space, such that evaporation of the fire-suppressing gas cools, or absorbs energy, from, the air in the system space
Implementation Method 2
evaporation of the fire-suppressing gas cools, or absorbs energy, from, the air in the system space
Data Source
AI summary
A temperature-control and fire-suppression system is provided for a system space, which optionally houses IT equipment. The system space has a ventilation system for providing controlled temperature air, for example to the IT equipment. A store of a fire-suppressing gas in liquid form is coupled to a supply means for supplying the fire-suppressing gas in liquid form to the system space, such that evaporation of the fire-suppressing gas in liquid form cools, or absorbs energy, from, the air in the system space. A temperature sensor is provided for sensing a temperature in the system space and a controller is responsive to the sensed temperature for controlling the supply means, to supply the fire-suppressing gas in liquid form while maintaining the sensed temperature above a predetermined lower temperature.