Defrosting control method, central controller and heating system
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Solution Overview
Problem
Heat pump water heaters experience reduced heating performance and efficiency due to frost buildup on the evaporator in low-temperature environments, with existing defrosting methods affecting user comfort and reliability.
Innovation Solution
A defrosting control method that involves heating fluid in a flow passage between the inlet and outlet of a first heat source using a second heat source, monitoring operation parameters like water outlet and return temperatures, and adjusting the heat exchange amount to ensure stable and efficient defrosting, while maintaining user comfort by minimizing temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse defrosting is used to remove frost from the evaporator, then defrosting function is achieved, but heating comfort is seriously affected and defrosting efficiency is low
Solution Approach 1:
A third heat source is introduced as an intermediary to assist the defrosting process. The third heat source provides additional heating capacity to the flow passage, enabling more effective frost removal while maintaining system stability and heating comfort during the defrosting operation.
Solution Approach 2:
The system dynamically adjusts the heat exchange amount between the second heat source and the flow passage based on real-time operation parameters (water outlet temperature, water return temperature, compressor status). This dynamic control optimizes defrosting efficiency while maintaining heating comfort and system reliability.
2Productivity
If heat exchange amount between second heat source and fluid is increased to improve defrosting efficiency, then defrosting speed increases, but temperature fluctuations increase affecting user comfort
Solution Approach 1:
The system continuously monitors operation parameters (water outlet temperature, water return temperature, compressor operation status) and uses this feedback to dynamically adjust the heat exchange amount between the second heat source and the flow passage. This closed-loop control ensures rapid defrosting while maintaining temperature stability and user comfort.
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
The method effectively shortens defrosting duration, improves efficiency, and ensures stable operation by adaptively adjusting the heat exchange amount based on monitored parameters, maintaining user comfort by reducing temperature fluctuations during the defrosting process.
Implementation Method 1
heating fluid in a flow passage between an inlet and an outlet of a first heat source by a second heat source
Implementation Method 2
a compressor compresses a low-pressure refrigerant at an outlet of an evaporator into a high-temperature and high-pressure gas to be discharged, which flows through a condenser for cooling and undergoes a phase change, so that the heat is transferred to water in a liner through the condenser
Implementation Method 3
the heat is transferred to water in a liner through the condenser
Implementation Method 4
The liquid refrigerant enters the evaporator after passing through an expansion valve, and since a pressure at the evaporator is low, the liquid refrigerant evaporates rapidly into a gaseous state, and absorbs a large amount of heat
Implementation Method 5
under the action of a fan, a large amount of air flows through an outer surface of the evaporator so that energy in the air is absorbed by the evaporator
Data Source
AI summary
The present disclosure discloses a defrosting control method, a central controller and a heating system. The defrosting control method comprises: heating fluid in a flow passage between an inlet and an outlet of a first heat source by a second heat source, at least in a part of process of defrosting by the first heat source; acquiring an operation parameter of the first heat source, wherein the operation parameter comprises a water outlet temperature and/or a water return temperature and/or an operation parameter of a compressor of the first heat source, comparing a current value of the acquired operation parameter with a preset range of the operation parameter, and adjusting a heat exchange amount between the second heat source and the fluid when the acquired current value is within the preset range. The defrosting control method, the central controller and the heating system provided by the present disclosure can improve the defrosting efficiency while considering the heating comfort, and ensure the stable operation of the defrosting process.