Method, device and non-transitory computer readable storage medium for HVAC and fresh air control
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Solution Overview
Problem
Conventional anti-cold-air control methods for fresh air machines often result in frequent on/off cycles of the fan and prolonged adjustment times for outlet wind speed, leading to inefficient anti-cold wind effects during mode transitions.
Innovation Solution
An anti-cold-air control method that adjusts the outlet wind speed of a fresh air machine based on real-time set and delivery air temperatures, external heat exchanger temperatures, and current wind speeds, using preset temperature and difference thresholds to optimize wind speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional on/off and wind level switching control is used based on temperature sensor at the central part of indoor heat exchanger, then the control scheme is simple, but the fan turns on or off frequently and the adjustment time is prolonged
Solution Approach 1:
The control method performs preliminary actions by predicting the temperature trend based on current temperature and its rate of change before the temperature actually drops. When the temperature is rising or stable, the system proactively maintains or increases fan speed to prevent future cold air discharge, rather than waiting for the temperature to drop and then reacting. This anticipatory control reduces the frequency of on/off cycling and shortens adjustment time.
Solution Approach 2:
The system implements feedback control by continuously monitoring the temperature and its rate of change, then adjusting the fan speed accordingly. The control algorithm uses the temperature trend information to dynamically adjust fan operation, creating a closed-loop system that responds to actual thermal conditions rather than following fixed on/off cycles. This feedback mechanism optimizes both response time and operational stability.
2Use of energy by moving object
If the fan operates in minimum wind level to maintain low temperature, then energy consumption is reduced, but the temperature value decreases rapidly causing frequent on/off cycles
Solution Approach 1:
The system applies dynamic control by continuously adjusting fan speed based on real-time temperature and its rate of change, rather than operating at fixed minimum wind level. The fan speed is modulated dynamically to maintain temperature stability, allowing the system to respond adaptively to changing thermal conditions. This dynamic adjustment prevents the temperature from dropping too rapidly while avoiding unnecessary on/off cycling, thereby improving control stability without excessive energy consumption.
Solution Approach 2:
The control method changes the operating parameters of the fan based on temperature conditions. Instead of maintaining a constant minimum wind level, the system varies fan speed as a parameter in response to temperature trends. When temperature is stable or rising, fan speed is maintained or increased; when temperature is already low and stable, fan speed can be reduced. This parameter adjustment optimizes both energy efficiency and control reliability.
3Object-affected harmful factors
If the fan is turned off to prevent cold air blowing, then cold air discharge is prevented, but the temperature sensor detects rapid temperature rise causing the fan to turn on again
Solution Approach 1:
The system applies preliminary anti-action by taking preventive measures before cold air discharge occurs. Instead of simply turning the fan off and waiting for temperature to drop, the control algorithm predicts temperature trends and adjusts fan operation in advance. When temperature is rising or stable, the system maintains or increases fan speed to preemptively prevent cold air discharge, rather than reacting after the temperature has already dropped. This proactive approach eliminates the need for frequent on/off cycling while maintaining effective cold air prevention.
Solution Approach 2:
The system uses feedback from temperature and its rate of change to intelligently control fan operation. Rather than simple on/off control based on a single temperature threshold, the feedback mechanism considers the temperature trend to determine optimal fan operation. This allows the system to maintain fan operation during stable or rising temperature conditions to prevent future cold air discharge, while avoiding unnecessary operation when temperatures are already low and stable, thereby improving overall control efficiency.
Data Source
AI summary
A new fan and an anti-cold air control method and apparatus therefor, the method comprising the following steps: during the process of a new fan switching from a heating mode to a cooling mode, acquiring in real time the set temperature and air supply temperature of the new fan and the middle-portion temperature of the indoor heat exchanger of the new fan (S1); acquiring the current output wind speed and the set wind speed of the new fan (S2); and adjusting the output wind speed of the new fan on the basis of the set temperature, the air supply temperature, the middle-portion temperature of the indoor heat exchanger, the current output wind speed, and the set wind speed (S3).