Frequency regulation control method and apparatus, device, and storage medium
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Solution Overview
Problem
Existing heat pump water heating systems face limitations in heating efficiency due to the formation of scaling layers in water tank coils, leading to reduced heat exchange capacity and decreased energy efficiency, as they continuously increase outlet water temperature to quickly raise water temperature.
Innovation Solution
A control method and apparatus for frequency regulation in heat pump units that monitor and adjust compressor frequency based on temperature differences between heat pump outlet water and tank water temperatures, performing frequency limiting or reduction operations to maintain optimal energy efficiency and prevent excessive temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat pump outlet water temperature is increased to increase the temperature difference and heating rate, then the heating efficiency of the water tank is improved, but the energy efficiency of the heat pump unit gradually decreases
Solution Approach 1:
The patent applies dynamics by making the compressor frequency adjustable and variable based on real-time temperature difference conditions. The system transitions from a static fixed-frequency operation to a dynamic variable-frequency operation, where the compressor frequency is modulated according to the temperature difference between heat pump outlet water and tank water, enabling optimal balance between heating rate and energy efficiency at different operating stages
Solution Approach 2:
The patent implements parameter changes by modifying the compressor operating frequency as a controllable parameter. The control method changes the frequency parameter of the compressor based on temperature difference thresholds, allowing the system to adapt its heating capacity and energy consumption characteristics to different operational requirements, thereby resolving the contradiction between heating rate and energy efficiency
2Speed
If the heat pump outlet water temperature is continuously increased to quickly raise water temperature, then the heating rate is improved, but scaling layers form in the water tank coil reducing heat exchange capacity
Solution Approach 1:
The patent applies preliminary action by implementing frequency limiting operations when the temperature difference reaches predetermined thresholds. The control method proactively limits the compressor frequency before excessive temperature differences can cause severe scaling, preventing damage to the heat exchange coil by anticipating and addressing the problem before it critically impacts heat exchange capacity
Solution Approach 2:
The patent implements feedback control by continuously monitoring the temperature difference between heat pump outlet water and tank water, and using this feedback information to adjust the compressor frequency. The system establishes a closed-loop control mechanism where temperature difference measurements feed back to the control unit, which then modulates compressor frequency to maintain optimal operating conditions and prevent scaling
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves heating efficiency by maintaining high energy efficiency when water temperatures are low and ensuring the heat pump unit operates within a high energy efficiency range, even when scaling layers reduce heat exchange capacity, thereby preventing rapid temperature increases and energy inefficiencies.
Implementation Method 1
after a heat pump unit produces hot water, the hot water is introduced to an inner coil of a water tank through a pipeline, and the hot water flows through the inner coil to exchange heat with water in the water tank
Implementation Method 2
controlling, if the temperature difference is greater than or equal to a first threshold, the compressor to perform a frequency limiting operation
Data Source
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AI summary
The present invention relates to the field of heat pump water heating regulation technologies, and discloses a control method, apparatus and device for frequency regulation, and a storage medium, to improve heating efficiency of a heat pump unit. The control method for frequency regulation includes: obtaining a first heat pump outlet water temperature and a first water tank temperature, where the first heat pump outlet water temperature is used to represent a temperature of hot water produced by the heat pump unit, and the first water tank temperature is used to represent a temperature of water in the water tank after heat exchange; calculating a temperature difference between the first heat pump outlet water temperature and the first water tank temperature if the first heat pump outlet water temperature is greater than or equal to a first preset value in a first preset time period; controlling, if the temperature difference is greater than or equal to a first threshold, a compressor to perform a frequency limiting operation, and obtaining a second heat pump outlet water temperature, where the second heat pump outlet water temperature is used to represent a temperature of hot water produced by the heat pump unit after the frequency limiting operation; and controlling the compressor to stop the frequency limiting operation if the second heat pump outlet water temperature meets a first preset condition.