Heat Pump Defrost Cycle Adjustment Based on Heating Cycle Time
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Solution Overview
Problem
Heat pumps face operational inefficiencies and mechanical issues due to frost accumulation on their surfaces, which can inhibit normal operation and lead to mechanical failure, and existing defrost methods often compromise user satisfaction and increase costs by frequently interrupting heating cycles.
Innovation Solution
A heat pump system that adjusts defrost operation properties based on heating cycle time, allowing for incremental changes in termination temperature and time, and employing primary and secondary defrost operations to manage frost accumulation while minimizing disruptions to heating cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defrost operations are frequently performed to remove frost accumulation, then frost removal effectiveness is improved, but heating cycle continuity deteriorates and user satisfaction decreases
Solution Approach 1:
The patent implements dynamic adjustment of defrost operation parameters based on real-time heating cycle time measurements. The controller monitors the actual heating cycle duration and compares it against a target cycle time, then dynamically modifies defrost termination temperature and timing to optimize the balance between frost removal and heating continuity. This dynamic approach allows the system to adapt defrost frequency and intensity to actual operating conditions rather than using fixed schedules.
Solution Approach 2:
The system changes key operational parameters (defrost termination temperature, defrost timing, heating cycle duration) to resolve the contradiction. By adjusting the defrost termination temperature threshold and timing based on measured heating cycle times, the system can perform defrost operations more efficiently without excessively interrupting heating cycles. The parameter adjustments allow flexible optimization of the trade-off between maintaining heat exchanger performance and preserving heating continuity.
2Reliability
If defrost operations are extended to ensure complete frost removal, then frost accumulation prevention is improved, but operational costs increase
Solution Approach 1:
The patent employs feedback control by continuously monitoring heating cycle time and using this information to adjust subsequent defrost operation parameters. The controller measures actual heating cycle duration, compares it to target values, and uses this feedback to determine optimal defrost termination points. This closed-loop feedback mechanism ensures defrost operations are performed only when necessary and at the minimum duration required to prevent frost accumulation, thereby reducing unnecessary energy consumption while maintaining reliability.
Solution Approach 2:
The system applies partial action by performing defrost operations at optimized termination points rather than using fixed extended durations. By calculating and applying only the necessary defrost duration based on actual heating cycle performance, the system avoids excessive defrost operations that would waste energy. The partial action approach applies just enough defrost treatment to prevent frost accumulation without over-treating, thus minimizing energy loss.
3Adaptability or versatility
If heating operation cycle time is shortened to improve responsiveness, then system adaptability is improved, but defrost operation effectiveness deteriorates
Solution Approach 1:
The system dynamically adjusts defrost operation parameters in response to varying heating cycle times. When heating cycles are shortened to improve responsiveness, the controller automatically adjusts defrost termination temperature and timing to ensure adequate frost removal effectiveness. This dynamic coordination allows the system to maintain both heating responsiveness and defrost effectiveness across different operating conditions without compromising either performance metric.
Data Source
AI summary
In various implementations, a heat pump may include heating operations and defrost operations. The heat pump may monitor cycle time(s) for one or more of the operations. Defrost operation(s) in the heat pump may be automatically adjusted based at least partially on cycle times.