Air Conditioner Dynamic Pressure Control to Reduce Compressor Cycling
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Solution Overview
Problem
Existing air conditioners experience frequent on-off cycles of the compressor, leading to fluctuations in indoor temperature and humidity, increased power consumption, and reduced reliability due to wear on components.
Innovation Solution
An air conditioner system that adjusts the target pressure of the compressor based on indoor temperature and humidity differences using a fuzzy table, allowing continuous operation to maintain comfortable indoor conditions and reduce compressor frequency fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor is repeatedly turned on and off according to changes in indoor temperature, then the indoor temperature can be controlled, but the fluctuation in indoor temperature increases and the fluctuation in indoor humidity increases
Solution Approach 1:
The patent applies dynamics by making the target pressure of the compressor variable rather than fixed. The controller dynamically adjusts the target pressure based on the current indoor temperature and humidity conditions, allowing the system to adapt to changing environmental conditions without requiring frequent on-off cycles. This dynamic adjustment smooths out temperature and humidity fluctuations while maintaining effective climate control.
Solution Approach 2:
The patent changes the parameter of target pressure from a fixed value to a variable value that depends on indoor temperature and humidity. By modifying this key parameter based on real-time sensor data, the system achieves more stable operation without frequent cycling, thereby reducing temperature and humidity fluctuations while maintaining control effectiveness.
2Ease of operation
If the compressor is repeatedly turned on and off, then the air conditioner can respond to temperature changes, but cumulative power consumption increases and reliability decreases due to increased wear of major components
Solution Approach 1:
The system uses dynamic target pressure adjustment to maintain responsive climate control while minimizing compressor cycling. By continuously adapting the target pressure to current conditions, the compressor can operate more smoothly with fewer start-stop cycles, thereby maintaining the ability to respond to temperature changes while significantly reducing wear on the compressor and other major components.
Solution Approach 2:
The patent promotes continuous operation of the compressor by adjusting the target pressure to match current environmental conditions. This continuous action with variable parameters allows the system to respond effectively to temperature changes while avoiding the harmful effects of frequent on-off cycling, thereby extending component life and improving reliability.
3Temperature
If the compressor is repeatedly turned on and off, then the air conditioner can maintain temperature setpoints, but the fluctuation in indoor humidity increases
Solution Approach 1:
The system dynamically adjusts the target pressure based on both temperature and humidity sensor readings. This dual-parameter control allows the system to maintain temperature setpoints while simultaneously stabilizing humidity levels, as the variable target pressure enables smoother compressor operation that prevents excessive humidity fluctuations during temperature adjustments.
4Device complexity
If a fixed target pressure is used for the compressor, then the control system is simple, but the compressor must be turned on and off frequently leading to increased wear
Solution Approach 1:
The patent implements a dynamic control system where the target pressure varies based on indoor temperature and humidity conditions. While this increases control system complexity compared to a fixed pressure system, it dramatically reduces compressor cycling and wear, thereby improving reliability. The added complexity is justified by the significant gains in component lifespan and system reliability.
Solution Approach 2:
The system uses feedback from temperature and humidity sensors to continuously adjust the target pressure. This closed-loop control with feedback mechanisms allows the system to optimize compressor operation in real-time, reducing unnecessary cycling and wear while maintaining accurate environmental control, thus improving reliability despite increased 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 maintains stable indoor temperature and humidity levels, reduces wear on components, and improves power efficiency by minimizing compressor on-off cycles.
Implementation Method 1
a pressure sensor configured to detect a pressure of the compressor
Implementation Method 2
an indoor humidity sensor configured to detect an indoor humidity
Implementation Method 3
an indoor temperature sensor configured to detect an indoor temperature
Implementation Method 4
a compressor configured to supply a refrigerant to the indoor heat exchanger
Implementation Method 5
an indoor heat exchanger; an air conditioner capable of performing a cooling operation or a heating operation
Data Source
AI summary
An air conditioner includes: an indoor unit including an indoor heat exchanger; an outdoor unit including a compressor configured to supply a refrigerant to the indoor heat exchanger; a pressure sensor configured to detect a pressure of the compressor; an indoor humidity sensor configured to detect an indoor humidity; an indoor temperature senor configured to detect an indoor temperature; and a controller comprising at least one processor, comprising processing circuitry, individually and/or collectively, configured to: periodically obtain a temperature difference between the indoor temperature and a desired temperature or a humidity difference between the indoor humidity and a reference humidity, adjust a target pressure of the compressor based on a first change amount of the temperature difference or a second change amount of the humidity difference, and adjust a frequency of the compressor in response to the target pressure being adjusted.