Defrost control method and heat pump system
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Solution Overview
Problem
Conventional defrosting control methods for heat pump systems are inefficient as they rely on preset time intervals, leading to either frequent unnecessary defrosting in low humidity and temperature conditions or inadequate defrosting in high humidity and temperature conditions, causing energy waste and user discomfort.
Innovation Solution
A defrosting control method that adjusts the defrosting interval based on outdoor temperature and humidity conditions by initializing default parameters for frost accumulation times and adjusting them dynamically based on actual defrosting times, using a preset defrosting interval indicatrix to balance system performance and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a preset time interval is used for defrosting control, then the defrosting cycle is simple to implement, but the defrosting timing does not match actual frosting conditions, causing energy waste and reduced user experience
Solution Approach 1:
The patent transforms the static preset time interval into a dynamic defrosting control mechanism by introducing a frosting degree indicator that adapts to real-time outdoor temperature and humidity conditions. The control system dynamically adjusts the defrosting timing based on the calculated frosting degree, which varies with environmental parameters, thereby optimizing energy consumption while maintaining simple implementation through automated sensing and calculation.
Solution Approach 2:
The patent implements feedback control by continuously monitoring outdoor temperature and humidity, calculating the frosting degree based on these parameters, and using this information to determine when defrosting should occur. This closed-loop feedback mechanism ensures that defrosting is triggered only when actually needed, preventing both unnecessary defrosting cycles and missed defrosting opportunities, thus reducing energy waste while keeping the control system relatively simple.
2Ease of operation
If a preset time interval is used for defrosting control, then the control method is easy to implement, but frequent unnecessary defrosting occurs in low humidity conditions, affecting user experience
Solution Approach 1:
The patent changes the control parameter from a fixed time interval to a variable frosting degree indicator that depends on outdoor temperature and humidity parameters. By calculating the frosting degree based on these environmental parameters, the system adapts its defrosting timing to match actual frosting conditions, improving adaptability while maintaining ease of implementation through automated parameter monitoring and calculation.
Solution Approach 2:
The patent makes the defrosting control dynamic by introducing a frosting degree indicator that responds to real-time environmental conditions. The system dynamically adjusts defrosting timing based on the calculated frosting degree, which varies with temperature and humidity, thereby achieving high adaptability to different environmental conditions while keeping the control implementation straightforward through automated sensing and decision-making.
3Device complexity
If a preset time interval is used for defrosting control, then the defrosting schedule is fixed and simple, but defrosting is delayed when high humidity causes severe frosting, reducing system performance
Solution Approach 1:
The patent uses feedback control to monitor outdoor temperature and humidity conditions and calculate the frosting degree in real-time. This feedback mechanism allows the system to detect when severe frosting conditions develop due to high humidity and trigger defrosting immediately, preventing performance degradation. The feedback-based approach maintains a simple control structure while significantly improving responsiveness to actual frosting conditions.
Solution Approach 2:
The patent transforms the fixed defrosting schedule into a dynamic control system that responds to real-time environmental conditions. By calculating the frosting degree based on current temperature and humidity, the system dynamically adjusts defrosting timing to match actual frosting severity, ensuring timely defrosting under high humidity conditions while maintaining simple implementation through automated calculation and control.
Data Source
Figure 1
AI summary
A heat pump system and a defrosting control method therefor are provided. The defrosting control method comprises: in S100, initializing a first default parameter TMn and a second default parameter TNn in a preset defrosting interval indicatrix X when a heat pump system runs, wherein the preset defrosting interval indicatrix X=T1/TMn+T2/TNn, T1 represents a running time of the heat pump system when an outdoor temperature is greater than or equal to an outdoor temperature preset value, T2 represents a running time of the heat pump system when the outdoor temperature is less than the outdoor temperature preset value, and n represents the number of executed defrosting cycles; in S200, executing the defrosting cycle when the preset defrosting interval indicatrix X is greater than or equal to a preset constant value, and terminating the defrosting cycle after a defrosting cycle exit condition is met; in S300, obtaining an actual time spent on the defrosting cycle; in S400, comparing the actual time spent on the defrosting cycle with an expected defrosting time, and adjusting the first default parameter and the second default parameter when the actual defrosting time deviates from the expected defrosting time; and in S500, repeating steps S200 to S400. The heat pump system and the defrosting control method therefor according to this application can adjust a defrosting interval according to an actual application situation and achieve a balance between unit performance and comfort degree of customers.