Control methods and devices for a low-temperature cooling air valve
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Solution Overview
Problem
In ultra-low temperature environments, conventional air conditioning systems face challenges in meeting refrigeration demands due to large temperature differences between condensing temperatures and ambient temperatures, leading to issues like low system pressures, liquid accumulation, and compressor starting difficulties.
Innovation Solution
A control method and device for a low-temperature cooling air valve that acquires actual system pressure, ambient temperature, and energy demand to determine the optimal opening degree, refining the valve's operation range and improving cooling reliability and range in multi-split air conditioners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional control strategies are used in ultra-low temperature environments, then system simplicity is maintained, but cooling capacity and heat exchange efficiency deteriorate due to large temperature differences between condensing temperature and ambient temperature
Solution Approach 1:
The patent implements dynamic control of the cooling air valve opening degree based on real-time detection of ambient temperature and system operating parameters. The control method dynamically adjusts the valve opening to optimize heat exchange efficiency under varying ultra-low temperature conditions, transforming the static valve control into a dynamic adaptive system that responds to environmental changes.
Solution Approach 2:
The patent changes the control parameters by introducing a cooling air valve opening degree parameter that is adjusted according to ambient temperature ranges. Different opening degree ranges are specified for different temperature zones, allowing the system to adapt to ultra-low temperature environments by modifying operational parameters rather than changing the physical system structure.
2Reliability
If the cooling air valve opening degree is not optimized, then device simplicity is maintained, but heat exchange efficiency and refrigeration load matching deteriorate in ultra-low temperature environments
Solution Approach 1:
The patent establishes a feedback control mechanism where the control system continuously monitors ambient temperature and system operating parameters, then adjusts the cooling air valve opening degree accordingly. This closed-loop feedback ensures reliable cooling operation by automatically compensating for temperature variations without requiring complex manual intervention or system redesign.
Solution Approach 2:
The patent implements preliminary action by pre-defining opening degree ranges for different ambient temperature zones. The control system proactively adjusts the valve opening before performance degradation occurs, ensuring reliable operation in ultra-low temperature conditions through advance preparation of control strategies rather than reactive adjustments.
3Adaptability or versatility
If existing control methods are used, then system simplicity is maintained, but the cooling operation range and ability to meet refrigeration demand deteriorate below −15° C.
Solution Approach 1:
The patent segments the ambient temperature range into multiple zones with different optimal cooling air valve opening degree ranges. By dividing the temperature spectrum into distinct segments and assigning specific control parameters to each segment, the system achieves broad adaptability across ultra-low temperature conditions while maintaining relatively simple control logic for each individual segment.
Solution Approach 2:
The patent creates a universal control method that can handle various ultra-low temperature scenarios through a single integrated control strategy. The cooling air valve control system serves multiple functions by adapting to different temperature conditions, expanding the overall cooling operation range without requiring separate specialized systems for each temperature zone.
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 solution effectively enhances cooling operation in ultra-low temperature environments by dynamically adjusting the low-temperature cooling air valve's opening degree based on system pressure, ambient temperature, and energy demand, addressing the limitations of existing systems.
Implementation Method 1
a convective heat exchange between the heat exchanger and the air still cannot match requirements of the refrigeration load
Data Source
AI summary
A control method and device for a low-temperature cooling air valve include: obtaining an actual system pressure, an ambient temperature, and a system energy requirement; and determining an opening degree pre according to the actual system pressure, the ambient temperature, and the system energy requirement. The control method is employed to perform combined control on the low-temperature cooling air valve according to the system high pressure, the ambient temperature and the system energy requirement, and can refine the range of opening degrees of the low-temperature cooling air valve and determine an opening degree thereof, thereby facilitating cooling operation of a multi-split air conditioning system in an ultra-low temperature environment, while also increasing the reliability of the cooling operation at low temperature and expanding the operation range.