Multi-Mode Refrigerant Cooling System for Dynamic Ambient Conditions
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Solution Overview
Problem
Conventional cooling systems are inefficient under varying load conditions and environmental conditions, leading to high energy consumption and maintenance costs, particularly in climates with high ambient temperatures and high latent loads, due to their inability to scale down energy use effectively and maintain efficient operation.
Innovation Solution
A cooling system comprising a first refrigerant circuit, a free cooling circuit, a chilled water circuit, and a second refrigerant circuit, with control valves and pumps that dynamically switch between free cooling and chilled water cooling based on ambient temperature, allowing for efficient condensation of refrigerant and reducing compressor load during high ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling systems operate at high ambient temperatures, then cooling capacity is maintained, but energy consumption increases dramatically
Solution Approach 1:
The system integrates multiple cooling modes (free cooling, evaporative cooling, and mechanical refrigeration) into a single multi-functional platform. The controller dynamically switches between these modes based on ambient conditions, allowing the system to maintain cooling capacity across varying temperatures while optimizing energy consumption by using passive cooling methods when possible.
Solution Approach 2:
The system employs dynamic control strategies where the controller continuously monitors ambient temperature and adjusts the cooling mode accordingly. This includes variable speed drives on compressors and fans, dynamic switching between free cooling and mechanical cooling, and real-time optimization of refrigerant flow to match actual cooling demands, thereby reducing energy waste during part-load operation.
2Use of energy by moving object
If free cooling is used during low ambient conditions, then energy consumption is reduced, but system complexity increases due to multiple cooling circuits
Solution Approach 1:
The system merges free cooling, evaporative cooling, and mechanical refrigeration circuits into an integrated architecture. By combining these previously separate systems into a unified platform with shared components (such as common refrigerant loops, integrated heat exchangers, and centralized control), the system reduces overall complexity while maintaining the energy-saving benefits of free cooling mode.
Solution Approach 2:
The controller acts as an intermediary that manages the complexity of coordinating multiple cooling circuits. It automatically selects and transitions between free cooling, evaporative cooling, and mechanical refrigeration modes based on ambient conditions, thereby shielding the user from system complexity while optimizing energy consumption through intelligent mode selection.
3Productivity
If chilled water cooling is used at high ambient temperatures, then cooling efficiency is maintained, but water consumption and maintenance costs increase
Solution Approach 1:
The system employs evaporative cooling technology that utilizes the latent heat of vaporization of water to provide cooling. By using evaporation towers and spray systems, the system achieves efficient heat rejection with minimal water consumption compared to traditional chilled water systems. The evaporative process naturally cools the refrigerant or cooling water without requiring large volumes of circulating water, thereby reducing water loss while maintaining high cooling efficiency in hot ambient conditions.
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 maximizes free cooling and mechanical cooling efficiency by using free cooling when ambient temperatures are low and switching to chilled water cooling at high temperatures, reducing energy consumption and maintenance costs across a range of environmental conditions.
Implementation Method 1
a free cooling circuit in fluid communication with the main condenser and a free-cooled water source
Implementation Method 2
a chilled water circuit in fluid communication with the main condenser and an evaporator
Implementation Method 3
an evaporator... The expanded liquid absorbs the heat present in the evaporator coil and leaves the coil as a super-heated vapor
Implementation Method 4
a main condenser... causing a refrigerant of the first refrigerant circuit to be condensed by a fluid flowing through the main condenser
Data Source
AI summary
The cooling systems of the present disclosure include a first refrigerant circuit in thermal communication with a heat load and in fluid communication with a main condenser, a free cooling circuit in fluid communication with the main condenser and a free-cooled water source, a chilled water circuit in fluid communication with the main condenser and an evaporator, and a second refrigerant circuit in fluid communication with the evaporator and a secondary condenser. The free cooling circuit is in thermal communication with the first refrigerant circuit via the main condenser, the chilled water circuit is in thermal communication with the first refrigerant circuit via the main condenser, and the second refrigeration circuit is in thermal communication with the chilled water circuit and the free cooling circuit. The second refrigeration circuit cools a fluid flowing in the chilled water circuit. Methods of operating a cooling system are also disclosed.