Central air conditioning system
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Solution Overview
Problem
Central air conditioning systems face challenges in installation, particularly in existing buildings, due to the need for extensive wiring, which is costly and troublesome. Additionally, wireless temperature sensors that reduce wiring frequency increase power consumption and battery size, affecting accuracy and cost.
Innovation Solution
A central air conditioning system that includes dampers for individual space conditioning, an air conditioning controller, and a temperature sensor that detects temperature and calculates temperature gradients. The system uses a temperature predictor to generate temperature information based on elapsed time and transmits data via wireless communication only when the temperature gradient exceeds a certain range, reducing communication frequency and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor transmits temperature information frequently to improve temperature control accuracy, then the temperature control accuracy is improved, but the power consumption increases
Solution Approach 1:
The system changes the transmission parameter from fixed interval to gradient-threshold based. The temperature sensor calculates the gradient (rate of change) of temperature and only transmits when the gradient exceeds a threshold, dynamically adjusting transmission behavior based on temperature change characteristics rather than using a fixed transmission interval.
Solution Approach 2:
The transmission frequency is made dynamic rather than static. Instead of transmitting at fixed intervals, the system adapts transmission timing based on real-time temperature gradient conditions, increasing transmission frequency when temperature changes rapidly and reducing it when temperature is stable, thereby optimizing both accuracy and power consumption.
2Measurement precision
If the transmission interval is shortened to improve temperature control accuracy, then the temperature control accuracy is improved, but the battery size increases
Solution Approach 1:
The system changes the transmission parameter from fixed interval to gradient-threshold based. By transmitting only when temperature gradient exceeds a threshold, the effective transmission interval becomes variable rather than fixed, reducing unnecessary transmissions and thereby reducing battery size requirements while maintaining temperature control accuracy.
3Measurement precision
If wireless communication frequency is increased to improve temperature monitoring accuracy, then the temperature monitoring accuracy is improved, but the power consumption increases
Solution Approach 1:
The system changes the communication parameter from fixed frequency to gradient-threshold based frequency. The temperature sensor calculates the gradient of temperature and only initiates wireless transmission when the gradient exceeds a predetermined threshold, making communication frequency dynamic and adaptive to actual temperature change conditions.
Solution Approach 2:
The communication frequency is made dynamic rather than static. The system adapts transmission timing based on real-time temperature gradient conditions, increasing communication frequency when temperature changes rapidly (improving monitoring accuracy when needed) and reducing it when temperature is stable (reducing power consumption).
Data Source
AI summary
A central air conditioning system includes dampers individually air conditioning multiple spaces, an air conditioning controller controlling the dampers, a temperature sensor disposed in each space to detect a temperature, and a temperature predictor that receives the detected temperature, predicts a temperature in each space, and transmits temperature information to the air conditioning controller. The temperature sensor may wirelessly transmit the detected temperature when an amount of change in temperature gradient exceeds an allowable range. Alternatively, the temperature sensor may predict a temperature based on a temperature gradient, and wirelessly transmit the detected temperature when a difference between the predicted and detected temperatures exceeds a certain range. Alternatively, the temperature sensor may predict a temperature by using one of prediction formulae, and transmit the detected temperature when a difference between the predicted and detected temperatures exceeds a certain range.