Control method, control device, air conditioning system and computer-readable storage medium
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Solution Overview
Problem
Air conditioning systems face issues with pipe freezing in the hydraulic device during defrosting due to low-temperature environments, affecting normal operation.
Innovation Solution
A control method and device that manage the participation of a heating device in defrosting operations by using valves to connect or disconnect it from an external heat exchanger based on its on/off state and temperature conditions, ensuring it does not freeze and can fully utilize the heating device for defrosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating device participates in the defrosting operation, then the defrosting efficiency is improved, but the pipe in the heating device may be frozen due to low-temperature environment
Solution Approach 1:
The system dynamically adjusts the connection state of the heating device to the external heat exchanger based on real-time temperature conditions. The first valve switches between open and closed states depending on whether the heating device temperature meets the predetermined condition, allowing the system to adapt to changing thermal environments and prevent pipe freezing while maintaining defrosting efficiency
Solution Approach 2:
The control device continuously monitors the temperature of the heating device and uses this feedback to determine whether to open or close the first valve. When the temperature satisfies the predetermined condition, the valve closes to protect the pipe; when the condition is not met, the valve opens to enable defrosting participation, creating a closed-loop control system that balances defrosting efficiency with pipe protection
2Reliability
If the first valve is closed to protect the heating device, then the pipe freezing risk is reduced, but the heating device cannot participate in defrosting operation
Solution Approach 1:
The system employs dynamic valve control rather than a fixed closed state. The first valve transitions between open and closed positions based on real-time temperature monitoring, allowing the heating device to participate in defrosting when conditions permit while protecting the pipe when temperatures are too low, thus resolving the contradiction between reliability and productivity
3Productivity
If the heating device is fully utilized for defrosting, then the defrosting efficiency is improved, but the heating device may be damaged due to low temperature
Solution Approach 1:
The system implements protective measures before damage can occur by monitoring the heating device temperature in advance. When the temperature satisfies the predetermined condition indicating risk of damage, the first valve closes beforehand to isolate the heating device from the low-temperature external heat exchanger, preventing thermal stress damage while allowing full utilization during safe temperature conditions
Solution Approach 2:
The control device uses temperature feedback from the heating device to dynamically adjust valve position, creating a protective control loop that maximizes defrosting utilization while preventing damage through real-time monitoring and responsive action
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 heating device can participate in defrosting without freezing, maintaining normal air conditioning system operation by controlling valve states and temperature thresholds, preventing pipe damage and ensuring efficient defrosting.
Implementation Method 1
The heating device is in a pipe connection with the external heat exchanger by the first valve
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A control method, a control device (200), an air conditioning system (100/300) and a computer-readable storage medium, the control method comprising: (S1 10) when a defrosting signal is obtained, detecting the on/off state of a heating device (13); (S130) when the heating device (13) is in the on state, controlling a first valve (17) to open to enable a pipeline between the heating device (13) and an external heat exchanger (15) to communicate, and so that the heating device (13) participates in a defrosting operation; (S150) when the heating device (13) is in the off state, controlling the first valve (17) to close, so that the pipeline between the heating device (13) and the external heat exchanger (15) is disconnected, and the heating device (13) does not participate in the defrosting operation; and (S170) when the heating device (13) participates in the defrosting operation and the temperature of the heating device (13) meets a preset condition, controlling the first valve (17) to close, or ending the defrosting operation.