Cooling system and control method therefor
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Solution Overview
Problem
Conventional refrigerant cooling systems for frequency converters face issues with condensation during low-load conditions and overheating during high-load conditions, leading to potential damage.
Innovation Solution
A dual-loop cooling system with a first loop without throttling and a second loop with throttling, controlled by solenoid valves and a temperature detection module, to maintain optimal refrigerant temperature and prevent condensation and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant throttling is used before cooling in the frequency converter, then cooling efficiency is improved, but condensation occurs during low-load conditions causing damage
Solution Approach 1:
The system dynamically switches between two cooling modes (throttled and non-throttled) based on real-time temperature detection and load conditions. The control unit adjusts the cooling strategy from static to dynamic, selecting appropriate solenoid valve configurations to prevent condensation during low-load conditions while maintaining efficient cooling during high-load conditions.
Solution Approach 2:
The system changes the refrigerant flow parameters (throttled vs. non-throttled) based on operating conditions. By detecting temperature and load status, the control unit switches between different refrigerant flow states, optimizing the cooling parameter to match the current operational requirements and prevent harmful condensation.
2Productivity
If refrigerant temperature is reduced for efficient cooling, then cooling performance is improved, but the frequency converter overheats during high-load conditions
Solution Approach 1:
The system employs dynamic adjustment of refrigerant temperature based on real-time monitoring. During high-load conditions, the control unit switches to non-throttled cooling mode which provides higher refrigerant temperature and sufficient cooling capacity, preventing overheating while maintaining high cooling efficiency.
Solution Approach 2:
The refrigerant temperature parameter is dynamically changed based on load conditions. The system switches between throttled (lower temperature) and non-throttled (higher temperature) modes, optimizing the temperature parameter to match cooling demands and prevent both condensation and overheating.
3Device complexity
If a single cooling loop is used, then system complexity is reduced, but the system cannot adapt to varying load conditions
Solution Approach 1:
The cooling system is segmented into two distinct cooling loops: a first cooling loop with throttled refrigerant and a second cooling loop with non-throttled refrigerant. This segmentation allows the system to select the appropriate cooling mode based on operational conditions, enhancing adaptability while maintaining manageable complexity through modular design.
Solution Approach 2:
The dual-loop cooling system provides multi-functionality by accommodating both low-load and high-load conditions within a single integrated system. The control unit universally manages both cooling modes, allowing the system to adapt to varying operational requirements without requiring separate independent systems.
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
Effectively prevents condensation during low-load conditions and provides sufficient cooling during high-load conditions, ensuring the frequency converter operates within a safe temperature range.
Implementation Method 1
a temperature detection module and a heat exchange module are arranged inside the frequency converter; when the temperature detection module detects that the temperature inside the frequency converter is lower than a switching temperature T
Implementation Method 2
a heat exchange module are arranged inside the frequency converter
Implementation Method 3
the refrigerant at a relatively low temperature enters the frequency converter to cause that the surface temperature of elements such as a refrigerant liquid supply copper pipe, a frequency converter cooling plate, etc. inside the frequency converter is too low
Data Source
Figure 1
AI summary
The present application discloses a cooling system and a control method thereof; the cooling system includes a compressor unit, a condenser, a first solenoid valve, a second solenoid valve, a first throttle valve and a frequency converter; the second solenoid valve and the first throttle valve are connected with the first solenoid valve in parallel after being connected in series with each other; the compressor unit, the condenser, the first solenoid valve and the frequency converter are connected in series to form a first cooling loop; the compressor unit, the condenser, the second solenoid valve, the first throttle valve and the frequency converter are connected in series to form a second cooling loop; and the frequency converter is internally provided with a temperature detection module and a heat exchange module.