Multi-type air conditioning system and anti-cold-air control method and apparatus of indoor unit thereof
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cold-air-avoidance control methods in multi-split air conditioning systems are unreliable and inaccurate, leading to unsatisfactory heating processes due to the need for additional temperature sensors and increased costs.
Innovation Solution
A method and apparatus that control the operating status of heating indoor units in multi-split air conditioning systems by obtaining saturation temperature, entrance temperature, and return air temperature, allowing for switching between different operating statuses to prevent cold air from being blown, thereby improving control reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is added at the central part of the indoor evaporator to implement cold-air-avoidance control, then the control function can be realized, but the cost increases and control reliability and accuracy remain unsatisfied
Solution Approach 1:
The patent uses the outdoor evaporator temperature as an intermediary parameter to indirectly control the indoor unit's cold air avoidance. Instead of directly measuring indoor evaporator temperature with additional sensors, the system uses the outdoor evaporator temperature (which is easier to access and control) as a proxy to regulate the indoor fan operation and prevent cold air blowing, thereby avoiding additional sensor costs while maintaining control reliability
Solution Approach 2:
The patent replaces the mechanical sensor-based temperature measurement system with a control system that uses existing temperature data and control algorithms. By substituting physical sensors with a computational approach that processes existing temperature parameters (outdoor evaporator temperature, saturation temperature, etc.), the system achieves reliable cold air avoidance control without adding hardware complexity
2Measurement precision
If control parameters are simplified to reduce device complexity, then device complexity decreases, but control precision deteriorates
Solution Approach 1:
The patent changes the control parameters from requiring direct indoor evaporator temperature measurement to using a combination of outdoor evaporator temperature, saturation temperature, and temperature difference calculations. By transforming the control approach to use these alternative parameters with established relationships, the system maintains high control precision for cold air avoidance while avoiding the need for additional sensors and complex measurement systems
Data Source
AI summary
It is provided a cold-air-avoidance control method and apparatus of an indoor unit of a multi-split air conditioning system, the multi-split air conditioning system includes an outdoor unit and a plurality of indoor units, and the cold-air-avoidance control method includes: obtaining a saturation temperature corresponding to a high pressure of the outdoor unit; obtaining an entrance temperature and a return air temperature of a heat exchanger of each heating indoor unit, and controlling an operating status of the heating indoor unit according to the saturation temperature, the entrance temperature and the return air temperature. With the method according to the present disclosure, reliability and accuracy of controlling the heating indoor unit can be improved, such that the effect of the cold-air-avoidance control is improved, and a more comfortable heating process is provided.