Hybrid Refrigerant Cooling With Economizer-DX Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cooling systems for data centers and similar applications face inefficiencies in temperature control, particularly in varying outdoor temperatures, as they often rely on single cooling modes that are either insufficient or overly resource-intensive, leading to suboptimal performance and increased energy consumption.
Innovation Solution
A cooling system with multiple operational modes that seamlessly transitions between pumped refrigerant economization cooling and direct expansion cooling, utilizing separate circuits with bypass valves and controllers to optimize refrigerant flow and energy usage based on outdoor temperature, ensuring efficient cooling demand satisfaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single cooling mode is used, then system complexity is reduced, but cooling performance and energy efficiency deteriorate under varying temperature conditions
Solution Approach 1:
The cooling system dynamically switches between two operational modes: pumped refrigerant economization mode and direct expansion mode. The controller automatically selects the appropriate mode based on outdoor temperature conditions, enabling the system to adapt its cooling strategy in real-time rather than operating in a fixed single mode.
Solution Approach 2:
The cooling system incorporates two distinct cooling circuits that can operate independently or in combination: a pumped refrigerant economization circuit for efficient cooling under certain conditions, and a direct expansion circuit for other conditions. This multi-functional architecture allows the system to handle diverse temperature scenarios effectively.
2Use of energy by moving object
If pumped refrigerant economization cooling is used, then energy efficiency is improved, but system complexity and operational requirements increase
Solution Approach 1:
The cooling system is divided into two separate cooling circuits: one dedicated to pumped refrigerant economization mode and another to direct expansion mode. Each circuit is independently configured with its own compressor, condenser, evaporator, and control valves, allowing optimized operation in each mode without compromising the other.
Solution Approach 2:
The system employs a four-way valve and associated control mechanisms as intermediaries to direct refrigerant flow between the two cooling circuits and the common evaporator. This intermediary infrastructure enables seamless switching between pumped and direct expansion modes while maintaining system efficiency.
3Device complexity
If direct expansion cooling is used, then system simplicity is maintained, but energy consumption increases under certain temperature conditions
Solution Approach 1:
The system dynamically adjusts its operational mode based on outdoor temperature. When outdoor temperatures are favorable, the controller activates pumped refrigerant economization mode to minimize energy consumption. When temperatures are less favorable, the system automatically transitions to direct expansion mode, ensuring optimal energy efficiency across all temperature conditions.
4Adaptability or versatility
If multi-mode cooling system is implemented, then energy efficiency and adaptability are improved, but control complexity increases
Solution Approach 1:
The controller continuously monitors outdoor temperature conditions and system operational parameters to determine the most efficient cooling mode. Based on this feedback, the controller automatically switches between pumped refrigerant economization mode and direct expansion mode, optimizing energy efficiency without requiring complex manual intervention.
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 multi-mode cooling system enhances energy efficiency and cooling capacity, adapting to varying temperature conditions to meet cooling demands effectively while minimizing energy consumption and operational complexity.
Implementation Method 1
pumped refrigerant economization cooling mode...liquid refrigerant...evaporator coil
Implementation Method 2
evaporator coil...absorb heat from air passing over the coil
Implementation Method 3
compressor compresses refrigerant gas, increasing its pressure and temperature
Implementation Method 4
heat rejection in the condenser...transfers heat from refrigerant to air or water
Implementation Method 5
expansion device reduces refrigerant pressure, causing temperature drop
Data Source
AI summary
A cooling system has both pumped refrigerant economization and direct expansion cooling. When outside air temperature is low enough that pumped refrigerant economization can provide enough cooling to satisfy cooling demand, only pumped refrigerant economization cooling is used to provide cooling. When outside air temperature is low enough that pumped refrigerant economization can provide some but not all of the cooling needed to satisfy cooling demand, the pumped refrigerant economization is operated at one hundred percent capacity and the direct expansion cooling is operated at a capacity to provide any supplemental cooling that is needed. If the outside air temperature is high enough that pumped refrigerant economization cannot provide any cooling, then only direct expansion cooling is used to provide cooling.