Dual chiller system
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Solution Overview
Problem
Dual chiller systems face inefficiencies in maintaining coolant temperatures and reducing power consumption, as they require continuous compressor operation to maintain temperature, leading to increased energy costs and reduced reliability.
Innovation Solution
A dual chiller system with a high-temperature tank and a low-temperature tank, each equipped with heaters and heat exchangers, along with automatic inlet valves and a system controller that selectively supplies coolants to substrate processing devices based on compressor output levels, optimizing coolant temperature and reducing energy usage by controlling compressor output and coolant circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If continuous compressor operation is used to maintain coolant temperature, then temperature stability is improved, but power consumption increases
Solution Approach 1:
The system uses periodic compressor operation with multiple output levels instead of continuous operation. The controller activates the compressor only when coolant temperature drops below preset thresholds, and adjusts compressor output levels based on temperature differential between tanks, achieving temperature stability while reducing overall power consumption.
Solution Approach 2:
The system dynamically adjusts compressor output levels (first, second, third output levels) based on real-time temperature conditions and coolant demand. The controller selects appropriate output levels to match actual cooling requirements, preventing energy waste from fixed high-power operation while maintaining temperature stability.
2Adaptability or versatility
If single temperature coolant supply is used, then system complexity is reduced, but adaptability to different substrate processing demands decreases
Solution Approach 1:
The system segments coolant supply into two independent temperature zones using separate tanks (high-temperature tank with first coolant, low-temperature tank with second coolant). Each tank operates independently with its own temperature control, allowing selective supply to different substrate processing devices based on their specific temperature requirements.
Solution Approach 2:
Automatic inlet valves act as intermediaries between the dual temperature coolant sources and substrate processing devices. These valves automatically select and route the appropriate temperature coolant based on device requirements, managing the complexity of dual-tank operation while providing simplified temperature selection to end devices.
3Loss of energy
If multiple compressor output levels are implemented, then energy efficiency is improved, but control system complexity increases
Solution Approach 1:
The control system continuously monitors coolant temperature in both tanks and automatically adjusts compressor output levels based on temperature feedback. When temperature differential between tanks exceeds thresholds, the controller selects appropriate output levels (first, second, or third), creating a closed-loop control system that optimizes energy efficiency through automated feedback-based decision making.
Solution Approach 2:
The system changes compressor operational parameters (output levels) based on temperature conditions. By adjusting compressor capacity to match actual cooling demand, the system achieves variable efficiency operation rather than fixed high-power mode, reducing energy loss while the automated parameter adjustment manages control complexity.
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 enhances economy, performance, and reliability by minimizing power consumption and maintaining optimal coolant temperatures, allowing for efficient operation across varying output levels and substrate processing demands.
Implementation Method 1
a first heat exchanger and a second heat exchanger, the first heat exchanger configured to cool the first coolant, and the second heat exchanger configured to cool the second coolant
Implementation Method 2
a compressor, and a condenser, a first branch line configured to introduce a refrigerant from the compressor into a line supplying the refrigerant from the cascade to the low-temperature tank
Implementation Method 3
a compressor, and a condenser, a first branch line configured to introduce a refrigerant from the compressor into a line supplying the refrigerant from the cascade to the low-temperature tank
Data Source
AI summary
A dual chiller system includes a high-temperature tank configured to supply a first coolant of a first temperature to the outside, a low-temperature tank configured to supply a second coolant of a second temperature lower than the first temperature to the outside, a first automatic inlet valve and a second automatic inlet valve respectively connected to the high-temperature tank and the low-temperature, a first substrate processing device configured to receive the first coolant or the second coolant from the first automatic inlet valve and a second substrate processing device configured to receive the first coolant or the second coolant from the second automatic inlet valve, a cooling unit and a system controller.