Method and device for controlling a low-temperature refrigeration air valve
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Solution Overview
Problem
Existing air conditioning systems face challenges in meeting refrigeration demands in ultra-low temperature environments due to large temperature differences between condenser and environment, leading to issues like low pressures and liquid accumulation in heat exchangers.
Innovation Solution
A method and device for controlling a low-temperature refrigeration air valve that adjusts its opening degree based on the difference between target and actual system pressures, using a formula that incorporates previous adjustments, to ensure effective heat exchange and meet refrigeration demands in ultra-low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the opening degree of the air valve is increased to enhance heat exchange in ultra-low temperature environments, then the refrigeration capacity is improved, but the system pressure becomes too low causing liquid accumulation in heat exchangers
Solution Approach 1:
The control method continuously monitors the actual system pressure and compares it with the target pressure, then dynamically adjusts the air valve opening degree based on the pressure difference feedback. This closed-loop control ensures the system maintains stable pressure while achieving adequate refrigeration capacity in ultra-low temperature environments.
Solution Approach 2:
The air valve opening degree is transformed from a fixed position to a dynamically adjustable parameter that changes in real-time according to system pressure conditions. This dynamic adjustment allows the system to adapt to varying operating conditions and maintain optimal performance across different temperature ranges.
2Productivity
If the condenser heat dissipation is increased to meet refrigeration demand, then the refrigeration effect is improved, but the temperature difference between condenser and environment becomes too large causing low high-pressure and low low-pressure
Solution Approach 1:
The system changes the operating parameters of the air valve from static to dynamic, adjusting the opening degree based on real-time pressure measurements. This parameter adjustment optimizes the balance between heat dissipation efficiency and system pressure maintenance, enabling the condenser to operate effectively even with large temperature differences in ultra-low temperature environments.
3Temperature
If the fan speed is reduced to lower the condenser temperature, then the temperature difference is reduced, but the heat exchange efficiency decreases
Solution Approach 1:
The air valve opening degree is made dynamic and adjustable based on system pressure feedback, replacing the static fan speed control approach. This dynamic control of the air valve provides a more precise mechanism for regulating heat exchange efficiency while maintaining appropriate system pressure, avoiding the trade-off between temperature reduction and efficiency loss.
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
This solution allows the air conditioning system to effectively meet refrigeration demands in ultra-low temperature environments by dynamically adjusting the air valve opening, thereby expanding the operational scope of refrigeration and preventing issues like low pressures and liquid accumulation.
Implementation Method 1
adjusting an opening degree of the air valve according to a difference value between the target pressure of the current system and the actual pressure of the current system
Implementation Method 2
the convective heat exchange between the heat exchanger and the air
Data Source
AI summary
A method and a device for controlling a low-temperature refrigeration air valve, the method includes: acquiring a current environment temperature; according to the current environment temperature, determining an initial target pressure of the current system and an initial opening degree of an air valve; acquiring an actual pressure of the current system and a target pressure of the current system; and adjusting an opening degree of the air valve according to a difference value between the target pressure of the current system and the actual pressure of the current system, wherein the air valve is disposed at a low-temperature cover. An opening degree of the air valve is adjusted according to the difference value between the target pressure of the current system and the actual pressure of the current system, to meet the refrigeration demand of the user in an ultra-low temperature environment, expanding the operation scope of refrigeration.