Modular Chiller Cooling Layout for Free and Mechanical Cooling
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Solution Overview
Problem
Existing cooling systems lack flexibility and efficiency in meeting varying cooling demands, particularly in data centers, as they often rely on parallel configurations that do not optimize the use of both mechanical and free cooling methods.
Innovation Solution
A modular cooling system with chiller modules featuring both refrigeration and free cooling circuits, where the coolant circuit connects heat absorbing heat exchangers in parallel for free cooling and in series for refrigeration, allowing for flexible operation and enhanced efficiency by adjusting the number of modules and modes of operation based on cooling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple chiller modules are connected in parallel configuration, then the cooling capacity is increased, but the energy efficiency is reduced
Solution Approach 1:
The system dynamically switches between parallel and series configurations of heat absorbing heat exchangers based on cooling demand. When high cooling capacity is needed, modules operate in parallel; when efficiency is prioritized, modules operate in series, allowing the system to adapt its topology to optimize the balance between capacity and energy consumption
Solution Approach 2:
The patent changes the operational parameters of the heat absorbing heat exchangers by altering their connection configuration (parallel to series) and operational modes (free cooling to mechanical cooling) based on varying cooling demands, thereby optimizing energy efficiency while maintaining required cooling capacity
2Power
If mechanical cooling is used to meet cooling demand, then the cooling capacity is ensured, but the energy consumption is increased
Solution Approach 1:
The system utilizes free cooling circuits that leverage ambient conditions to cool the working fluid without mechanical compression, allowing the system to serve its own cooling needs using natural heat exchange processes, thereby reducing energy consumption while maintaining cooling capacity when environmental conditions permit
Solution Approach 2:
The heat absorbing heat exchangers act as intermediaries that enable heat transfer between the working fluid and ambient environment in free cooling mode, or between chiller modules in series configuration, facilitating efficient heat exchange that reduces reliance on energy-intensive mechanical cooling
3Loss of energy
If free cooling circuit is used, then the energy consumption is reduced, but the cooling capacity is limited
Solution Approach 1:
The cooling system is segmented into multiple independent chiller modules, each with its own free cooling and mechanical cooling circuits. This segmentation allows the system to activate only the necessary number and type of modules based on cooling demand, enabling free cooling to handle base loads efficiently while mechanical cooling can be activated to meet peak demands
4Power
If the number of chiller modules is increased, then the cooling capacity is increased, but the system complexity is increased
Solution Approach 1:
The system is divided into standardized, modular chiller units that can be independently configured and controlled. Each module is self-contained with identical components and control logic, which simplifies the overall system management despite having multiple modules, as each unit operates autonomously according to the same control rules
Solution Approach 2:
Each chiller module is designed as a universal unit capable of operating in multiple modes (free cooling, mechanical cooling, series connection, parallel connection) to serve different cooling demands. This multi-functionality reduces system complexity by using identical standardized components rather than requiring specialized equipment for different operating scenarios
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 increased flexibility and efficiency by optimizing the use of both mechanical and free cooling methods, allowing for greater control over cooling output and reducing energy consumption by using series connections of refrigeration circuits.
Implementation Method 1
the working fluid can be cooled in heat exchange with the heat absorbing heat exchangers of the free cooling circuits and heat exchange with the heat absorbing heat exchangers of the refrigeration circuits
Data Source
AI summary
A modular cooling system comprising a plurality of chiller modules and a coolant circuit with flow paths having parts in each of the plurality of chiller modules. The coolant circuit cools a working fluid to meet a cooling demand, and the working fluid can be cooled in heat exchange with the heat absorbing heat exchangers of the free cooling circuits and heat exchange with the heat absorbing heat exchangers of the refrigeration circuits. The flow paths of the coolant circuit connect to the heat absorbing heat exchangers of the free cooling circuits in parallel and connect to the heat absorbing heat exchangers of the refrigeration circuits in series. The coolant circuit flow paths split along parallel flows through the heat absorbing heat exchangers of the free cooling circuits before recombining to flow sequentially in a combined flow path through the heat absorbing heat exchangers of the refrigeration circuits.