Air conditioning system and method of operating the same
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Solution Overview
Problem
Conventional invariable-frequency air conditioning systems fail to accurately and stably control area temperature due to uncontrolled rotation speeds of condensing and evaporating fans, leading to frequent compressor operation and reduced lifespan, while variable-frequency systems are complex and costly.
Innovation Solution
An air conditioning system with a control unit that manages the operation of two compressors and fans, using AC-to-DC conversion and PWM signals to adjust compressor and fan speeds based on temperature differences, allowing precise temperature control without frequent compressor cycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single compressor is operated in conventional invariable-frequency air conditioning systems, then the system structure is simple, but the area temperature cannot be accurately and stably controlled and the compressor must be frequently turned on and off
Solution Approach 1:
The single compressor is segmented into multiple compressors (first compressor and second compressor). Each compressor can be independently controlled to operate or stop based on temperature conditions. This segmentation allows for more precise temperature control by adjusting the number of operating compressors, while maintaining the simplicity of using standard invariable-frequency compressors.
2Device complexity
If the compressor is frequently turned on and off to maintain area temperature, then the system structure remains simple, but the operation life of the compressor is shortened
Solution Approach 1:
By dividing the compression function into multiple compressors, the system can distribute the workload and avoid frequent on-off cycling of a single compressor. The control unit can smoothly transition between one or two compressors operating, reducing the frequency of start-stop operations and extending compressor lifespan.
3Measurement precision
If variable-frequency compressors are used to achieve accurate temperature control and reduce compressor cycling, then the compressor operation life is extended and temperature control is improved, but the system complexity and cost increase
Solution Approach 1:
Instead of using a complex variable-frequency compressor, the patent segments the compression capacity into multiple invariable-frequency compressors. This approach achieves similar temperature control accuracy by controlling the number of operating compressors rather than varying the speed of a single compressor, thereby avoiding the complexity and high cost of variable-frequency technology.
4Duration of action of stationary object
If variable-frequency compressors are used to reduce compressor on-off frequency, then the compressor operation life is extended, but the overall system cost increases
Solution Approach 1:
The patent uses multiple invariable-frequency compressors instead of expensive variable-frequency compressors. By controlling which compressors operate, the system extends compressor life without incurring the high costs associated with variable-frequency technology, making it a more economical solution.
5Device complexity
If the rotation speed of the condensing fan is not controlled, then the system structure remains simple, but the area temperature control accuracy deteriorates
Solution Approach 1:
The condensing fan's rotation speed is made dynamically adjustable through PWM control. The control unit can vary the fan speed based on operating conditions, improving heat exchange efficiency and temperature control accuracy. This dynamic control is implemented using simple PWM signals, maintaining relative system simplicity while achieving better performance.
6Device complexity
If the rotation speed of the evaporating fan is not controlled, then the system structure remains simple, but the area temperature control accuracy deteriorates
Solution Approach 1:
The evaporating fan's rotation speed is dynamically controlled using PWM signals. The control unit adjusts the fan speed according to temperature conditions and system load, improving evaporative heat exchange efficiency and overall temperature control accuracy without significantly increasing system complexity.
Data Source
AI summary
An air conditioning system includes a control unit, a circulation system, an AC-to-DC conversion unit, and a fan module. The control unit detects an area temperature, controls the compressor unit being in operation or not in operation according to the area temperature and a setting temperature set by the control unit, and control a rotation speed of the condensing fan according to a temperature difference between the area temperature and the setting temperature. When the area temperature is greater than the setting temperature, the control unit controls the compressor unit being in operation and control the condensing fan being in full-speed operation.