Integrated Chiller-Free Cooling Layout for High Ambient Operation
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Solution Overview
Problem
Existing chiller systems face inefficiencies and increased risk of system faults due to the need for separate chiller and free cooling units, leading to unused heat transfer areas and potential human errors, especially when units are not designed to operate together.
Innovation Solution
A combined chiller/free cooling system with outdoor coils arranged in parallel and controlled by a system of valves, allowing for efficient operation in high, low, and intermediate temperature modes, ensuring full utilization of heat transfer resources and integrating refrigerant-based cooling and free cooling effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If separate chiller unit and free cooling unit are used, then cooling capacity is provided, but heat transfer area is inefficiently utilized with unused resources
Solution Approach 1:
The patent combines the chiller unit and free cooling unit into a single integrated system where the condenser and evaporator heat transfer components are shared between both cooling modes. This merging eliminates the inefficiency of having separate units with idle heat transfer area, as the same heat transfer components serve both the refrigeration cycle and free cooling operations.
Solution Approach 2:
The heat transfer components (condenser and evaporator) are designed to perform multiple functions: they operate as part of the refrigeration cycle during chiller mode and as heat exchangers with outdoor air during free cooling mode. This multi-functionality ensures that the heat transfer area is fully utilized regardless of the operating mode, eliminating waste of thermal resources.
2Adaptability or versatility
If separate chiller unit and free cooling unit are combined, then cooling functionality is provided, but system faults increase due to human error
Solution Approach 1:
By integrating the control systems of the chiller and free cooling units into a single unified controller, the patent eliminates the risk of coordination errors between separate units. The unified controller manages the refrigeration cycle and free cooling operations through a single control logic, preventing mismatches and ensuring reliable operation across all modes.
Solution Approach 2:
The system employs dynamic control that automatically transitions between chiller mode, free cooling mode, and intermediate modes based on outdoor temperature and cooling demand. This dynamic operation is managed by a single controller that adjusts system parameters in real-time, eliminating the need for manual intervention and reducing human error in mode switching.
3Productivity
If chiller unit operates at high ambient temperature, then cooling is provided, but free cooling unit heat transfer resources remain idle
Solution Approach 1:
The system dynamically adjusts the operating mode based on outdoor temperature. When outdoor temperature rises above the free cooling threshold, the controller automatically transitions to chiller mode or intermediate mode, activating the refrigeration cycle while keeping the heat transfer components engaged through alternative cooling pathways, thus preventing idle resources.
Solution Approach 2:
The system changes operational parameters (refrigerant flow paths, valve positions, compressor operation) based on outdoor temperature conditions. This allows the heat transfer components to remain productive across a wider temperature range by switching between different thermal pathways, ensuring that cooling capacity is maintained without leaving resources unused.
4Use of energy by stationary object
If free cooling unit operates at low ambient temperature, then cooling is provided, but chiller unit heat transfer resources remain idle
Solution Approach 1:
The system dynamically switches between free cooling mode and chiller mode based on outdoor temperature. When outdoor temperature is low, free cooling is activated; when temperature rises, the system transitions to chiller mode. This dynamic switching ensures that the heat transfer components remain continuously utilized, preventing idle resources while maintaining energy efficiency.
Solution Approach 2:
The integrated design ensures continuous useful action of the heat transfer components by providing alternative cooling pathways. When free cooling is not sufficient, the refrigeration cycle activates to maintain cooling through the same heat transfer components, ensuring they remain productive without interruption or idle time.
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 combined system optimizes cooling efficiency by utilizing all heat transfer resources, reducing waste and human error, and enabling free cooling at higher ambient temperatures than previous technologies, thereby improving overall cooling performance and reliability.
Implementation Method 1
outdoor coils arranged in parallel, such that a first-side inlet of each coil is in fluid communication with a first-side coolant line and a second-side outlet of each coil is in fluid communication with the same second-side coolant line
Implementation Method 2
A third valve may be positioned to regulate the flow of coolant from the second-side coolant line (on the side of the second set of coils) toward a water evaporator
Implementation Method 3
A fourth valve may be positioned to regulate a flow of coolant from the second-side coolant line (on the side of the first set of coils) to a water condenser
Data Source
AI summary
A system includes a first set of coils that receive coolant from a first coolant line and provide the coolant to a second coolant line. A second set of coils that receive coolant from a third coolant line and provide the coolant to a fourth coolant line. A first valve regulates flow of coolant between the first and third coolant line. A second valve regulates flow of coolant between the second and the fourth coolant lines. A third valve regulates flow of coolant between the fourth coolant line and a fifth coolant line coupled to a water evaporator and a three-way valve. The three-way valve regulates flow of coolant between the fifth coolant line, the third coolant line, and a coolant input line. A fourth valve regulates flow of coolant between the second coolant line and a water condenser. A controller adjusts the valves to operate in a high temperature mode.