Free cooling refrigeration system
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Solution Overview
Problem
Conventional refrigeration systems face inefficiencies in utilizing ambient low temperatures for cooling, especially when ambient temperatures rise, requiring additional energy inputs from compressors or heat sources to maintain cooling capacity.
Innovation Solution
A refrigeration system incorporating a free cooling system with two circuits, where a cooling fluid circulates through a heat exchanger to exchange heat with ambient air without a vapor-compression cycle, and a vapor-compression refrigeration system, allowing for efficient heat transfer and supplemental cooling by circulating a portion of the cooling fluid through a common heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a separate heat exchanger or coil portion is used for free cooling mode, then cooling efficiency is improved when ambient temperatures are low, but device complexity increases and the system becomes less adaptable when ambient temperatures rise
Solution Approach 1:
The patent combines the free cooling heat exchanger and vapor-compression heat exchanger into a single integrated heat exchanger unit. This allows the system to share common components while maintaining the ability to operate in different modes (free cooling, vapor-compression, or hybrid), thereby reducing overall device complexity and improving adaptability across varying ambient temperatures.
Solution Approach 2:
The integrated heat exchanger is designed to perform multiple functions: it serves as the primary heat exchanger during free cooling mode, provides supplemental cooling during vapor-compression mode, and enables hybrid operation. This multi-functionality allows a single component to replace what would traditionally require separate dedicated heat exchangers for each mode.
2Reliability
If a separate heat exchanger is dedicated to free cooling mode, then cooling performance is optimized during free cooling operation, but adaptability decreases when ambient temperatures rise and supplemental cooling is needed
Solution Approach 1:
By merging the free cooling and vapor-compression heat exchanger functions into a single integrated unit, the system maintains optimized heat transfer performance across all operating modes while gaining the flexibility to adapt to varying ambient conditions. The unified design allows seamless transition between free cooling, vapor-compression, and hybrid modes.
Solution Approach 2:
The system dynamically adjusts the operation of the integrated heat exchanger based on ambient temperature conditions and cooling demands. During free cooling mode, it operates independently; during vapor-compression mode, it provides supplemental cooling; and during hybrid mode, it works in conjunction with the vapor-compression cycle, thereby adapting to different operational requirements.
3Loss of energy
If conventional refrigeration systems use separate heat exchangers for free cooling and vapor-compression modes, then each mode can be optimized independently, but energy efficiency decreases when ambient temperatures are high
Solution Approach 1:
The integrated heat exchanger enables the system to capture and utilize cooling opportunities from ambient air across all temperature conditions. By combining free cooling and vapor-compression functions in one unit, the system can operate in hybrid mode where the heat exchanger provides supplemental cooling even during vapor-compression operation, thereby reducing compressor runtime and improving overall energy efficiency regardless of ambient temperature.
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
Enables efficient cooling without additional energy input when ambient temperatures are low, and provides enhanced cooling capacity by utilizing the heat transfer between the refrigerant and cooling fluid, even in higher ambient temperatures, thus optimizing energy usage and cooling performance.
Implementation Method 1
a free cooling system configured to exchange heat between a cooling fluid and ambient air
Implementation Method 2
circulate the cooling fluid through a first circuit to exchange heat between the cooling fluid and ambient air
Implementation Method 3
a heat exchanger configured to receive refrigerant and to transfer heat from the refrigerant to the cooling fluid
Implementation Method 4
transfer heat from the refrigerant to the cooling fluid
Implementation Method 5
an evaporator configured to remove heat from a cooling fluid circulating through a cooling loop
Implementation Method 6
The fluid flowing within the closed loop is generally formulated to undergo phase changes within the normal operating temperatures and pressures of the system so that considerable quantities of heat can be exchanged by virtue of the latent heat of vaporization of the fluid
Data Source
AI summary
A refrigeration system includes a chiller with an integrated free cooling system and refrigeration system. In certain embodiments, the chiller may be a single package unit with all equipment housed within the same support frame. The chiller may generally include three modes of operation: a first mode that employs free cooling, a second mode that employs free cooling and implements a refrigeration cycle, and a third mode that uses the free cooling system to remove heat from the refrigeration system. A heat exchanger may be shared between the free cooling system and the refrigeration system to transfer heat from the refrigeration system to the free cooling system.