Air-Conditioner Temperature-Difference Control for Preconditioning
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Solution Overview
Problem
Existing air-conditioning systems lack versatility in precooling and preheating control, making it difficult to apply these operations to various types of air-conditioning apparatuses, and they are not easily controllable from external systems like HEMS, which limits energy-saving and comfort improvements.
Innovation Solution
The system controls the setting temperature to maintain a specific temperature difference with the indoor temperature, allowing the compressor to operate efficiently from low to medium capacity, and enables precooling and preheating control through external controllers, facilitating energy-saving and comfort enhancements across different air-conditioning types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the compressor operates at high capacity to quickly reach target temperature, then precooling/preheating speed is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the compressor frequency based on the temperature difference between indoor and setting temperatures. When the temperature difference is large, the compressor operates at higher capacity for rapid cooling/heating. As the temperature approaches the setting temperature, the compressor frequency is reduced. This dynamic adjustment optimizes both speed and energy consumption during preliminary operations.
Solution Approach 2:
The control system changes the operating parameters of the compressor by adjusting its frequency based on real-time temperature conditions. The compressor frequency is modified as a variable parameter rather than maintaining a fixed high value, allowing the system to adapt its power consumption to the actual cooling/heating needs at different stages of the preliminary operation.
2Use of energy by moving object
If the setting temperature is continuously adjusted to maintain optimal temperature difference, then operation efficiency is improved, but control complexity increases
Solution Approach 1:
The control system employs a feedback mechanism where the indoor temperature is continuously measured and compared with the setting temperature. Based on this temperature difference feedback, the controller automatically adjusts the compressor frequency to maintain optimal operating conditions. This feedback-based approach improves efficiency while keeping the control logic relatively simple and intuitive.
Solution Approach 2:
The air-conditioning apparatus performs self-adjustment of compressor frequency based on the setting temperature provided by the external controller. The system uses its own temperature sensor and controller to automatically regulate its operation without requiring complex external control logic. This self-service capability simplifies the overall control architecture while maintaining high operation efficiency.
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 approach increases operation efficiency, reduces power consumption, and allows for seamless integration with HEMS, enabling precooling and preheating control in various air-conditioning systems, thereby improving comfort and reducing peak power consumption.
Implementation Method 1
a compressor 26
Implementation Method 2
an indoor heat exchanger 25... an outdoor heat exchanger 27
Data Source
AI summary
In an air-conditioning system, during precooling or preheating control, a setting temperature is controlled such that a first temperature difference between the setting temperature and an indoor temperature is not less than a temperature difference at which a compressor performs operation, and the setting temperature is controlled to be changed to a target temperature when a second temperature difference between the indoor temperature and the target temperature is less than the first temperature difference. Since the compressor can be operated in the range from a low capacity to a medium capacity, operation efficiency of the air-conditioning apparatus can be increased, and the energy-saving operation with less power consumption can be realized. Since the operation capacity of the compressor can be readily suppressed with adjustment of the setting temperature, control is facilitated and the precooling control can be incorporated in various types of air-conditioning apparatuses.